1
|
Wutke S, Blank SM, Boevé JL, Faircloth BC, Koch F, Linnen CR, Malm T, Niu G, Prous M, Schiff NM, Schmidt S, Taeger A, Vilhelmsen L, Wahlberg N, Wei M, Nyman T. Phylogenomics and biogeography of sawflies and woodwasps (Hymenoptera, Symphyta). Mol Phylogenet Evol 2024; 199:108144. [PMID: 38972494 DOI: 10.1016/j.ympev.2024.108144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2024] [Revised: 07/03/2024] [Accepted: 07/04/2024] [Indexed: 07/09/2024]
Abstract
Phylogenomic approaches have recently helped elucidate various insect relationships, but large-scale comprehensive analyses on relationships within sawflies and woodwasps are still lacking. Here, we infer the relationships and long-term biogeographic history of these hymenopteran groups using a large dataset of 354 UCE loci collected from 385 species that represent all major lineages. Early Hymenoptera started diversifying during the Early Triassic ∼249 Ma and spread all over the ancient supercontinent Pangaea. We recovered Xyeloidea as a monophyletic sister group to other Hymenoptera and Pamphilioidea as sister to Unicalcarida. Within the diverse family Tenthredinidae, our taxonomically and geographically expanded taxon sampling highlights the non-monophyly of several traditionally defined subfamilies. In addition, the recent removal of Athalia and related genera from the Tenthredinidae into the separate family Athaliidae is supported. The deep historical biogeography of the group is characterised by independent dispersals and re-colonisations between the northern (Laurasia) and southern (Gondwana) palaeocontinents. The breakup of these landmasses led to ancient vicariance in several Gondwanan lineages, while interchange across the Northern Hemisphere has continued until the Recent. The little-studied African sawfly fauna is likewise a diverse mixture of groups with varying routes of colonization. Our results reveal interesting parallels in the evolution and biogeography of early hymenopterans and other ancient insect groups.
Collapse
Affiliation(s)
- Saskia Wutke
- Department of Environmental and Biological Sciences, University of Eastern Finland, Joensuu, Finland.
| | - Stephan M Blank
- Senckenberg Deutsches Entomologisches Institut, Müncheberg, Germany
| | - Jean-Luc Boevé
- OD Taxonomy and Phylogeny, Royal Belgian Institute of Natural Sciences, Brussels, Belgium
| | - Brant C Faircloth
- Museum of Natural Science and Department of Biological Sciences, Louisiana State University, Baton Rouge, LA, USA
| | - Frank Koch
- Museum für Naturkunde, Leibniz Institute for Evolution and Biodiversity Science, Berlin, Germany
| | | | - Tobias Malm
- Department of Zoology, Swedish Museum of Natural History, Stockholm, Sweden
| | - Gengyun Niu
- College of Life Sciences, Jiangxi Normal University, Nanchang, Jiangxi, China
| | - Marko Prous
- Museum of Natural History, University of Tartu, Estonia
| | - Nathan M Schiff
- Formerly with the USDA Forest Service, Southern Research Station, Center for Bottomland Hardwoods Research, Stoneville, MS, USA
| | - Stefan Schmidt
- SNSB-Zoologische Staatssammlung München, Munich, Germany
| | - Andreas Taeger
- Senckenberg Deutsches Entomologisches Institut, Müncheberg, Germany
| | - Lars Vilhelmsen
- Natural History Museum of Denmark, SCIENCE, University of Copenhagen, Denmark
| | | | - Meicai Wei
- College of Life Sciences, Jiangxi Normal University, Nanchang, Jiangxi, China
| | - Tommi Nyman
- Department of Ecosystems in the Barents Region, Norwegian Institute of Bioeconomy Research, Svanvik, Norway
| |
Collapse
|
2
|
Berasategui A, Salem H, Moller AG, Christopher Y, Vidaurre Montoya Q, Conn C, Read TD, Rodrigues A, Ziemert N, Gerardo N. Genomic insights into the evolution of secondary metabolism of Escovopsis and its allies, specialized fungal symbionts of fungus-farming ants. mSystems 2024; 9:e0057624. [PMID: 38904377 PMCID: PMC11265373 DOI: 10.1128/msystems.00576-24] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2024] [Accepted: 05/14/2024] [Indexed: 06/22/2024] Open
Abstract
The metabolic intimacy of symbiosis often demands the work of specialists. Natural products and defensive secondary metabolites can drive specificity by ensuring infection and propagation across host generations. But in contrast to bacteria, little is known about the diversity and distribution of natural product biosynthetic pathways among fungi and how they evolve to facilitate symbiosis and adaptation to their host environment. In this study, we define the secondary metabolism of Escovopsis and closely related genera, symbionts in the gardens of fungus-farming ants. We ask how the gain and loss of various biosynthetic pathways correspond to divergent lifestyles. Long-read sequencing allowed us to define the chromosomal features of representative Escovopsis strains, revealing highly reduced genomes composed of seven to eight chromosomes. The genomes are highly syntenic with macrosynteny decreasing with increasing phylogenetic distance, while maintaining a high degree of mesosynteny. An ancestral state reconstruction analysis of biosynthetic pathways revealed that, while many secondary metabolites are shared with non-ant-associated Sordariomycetes, 56 pathways are unique to the symbiotic genera. Reflecting adaptation to diverging ant agricultural systems, we observe that the stepwise acquisition of these pathways mirrors the ecological radiations of attine ants and the dynamic recruitment and replacement of their fungal cultivars. As different clades encode characteristic combinations of biosynthetic gene clusters, these delineating profiles provide important insights into the possible mechanisms underlying specificity between these symbionts and their fungal hosts. Collectively, our findings shed light on the evolutionary dynamic nature of secondary metabolism in Escovopsis and its allies, reflecting adaptation of the symbionts to an ancient agricultural system.IMPORTANCEMicrobial symbionts interact with their hosts and competitors through a remarkable array of secondary metabolites and natural products. Here, we highlight the highly streamlined genomic features of attine-associated fungal symbionts. The genomes of Escovopsis species, as well as species from other symbiont genera, many of which are common with the gardens of fungus-growing ants, are defined by seven chromosomes. Despite a high degree of metabolic conservation, we observe some variation in the symbionts' potential to produce secondary metabolites. As the phylogenetic distribution of the encoding biosynthetic gene clusters coincides with attine transitions in agricultural systems, we highlight the likely role of these metabolites in mediating adaptation by a group of highly specialized symbionts.
Collapse
Affiliation(s)
- Aileen Berasategui
- Department of Biology, Emory University, Atlanta, Georgia, USA
- Cluster of Excellence-Controlling Microbes to Fight Infections, University of Tübingen, Tübingen, Germany
- Mutualisms Research Group, Max Planck Institute for Biology, Tübingen, Germany
- Amsterdam Institute for Life and Environment, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands
| | - Hassan Salem
- Department of Biology, Emory University, Atlanta, Georgia, USA
- Mutualisms Research Group, Max Planck Institute for Biology, Tübingen, Germany
| | - Abraham G. Moller
- Division of Infectious Diseases, Emory University School of Medicine, Atlanta, Georgia, USA
| | - Yuliana Christopher
- Instituto de Investigaciones Científicas y Servicios de Alta Tecnología, Ciudad del Saber, Panamá City, Panama
| | - Quimi Vidaurre Montoya
- Department of General and Applied Biology, São Paulo State University (UNESP), Institute of Biosciences, Rio Claro, São Paulo, Brazil
| | - Caitlin Conn
- Department of Biology, Emory University, Atlanta, Georgia, USA
- Department of Biology, Berry College, Mount Berry, Georgia, USA
| | - Timothy D. Read
- Division of Infectious Diseases, Emory University School of Medicine, Atlanta, Georgia, USA
| | - Andre Rodrigues
- Department of General and Applied Biology, São Paulo State University (UNESP), Institute of Biosciences, Rio Claro, São Paulo, Brazil
| | - Nadine Ziemert
- Cluster of Excellence-Controlling Microbes to Fight Infections, University of Tübingen, Tübingen, Germany
- Translational Genome Mining for Natural Products, Interfaculty Institute of Microbiology and Infection Medicine Tübingen (IMIT), Interfaculty Institute for Biomedical Informatics (IBMI), University of Tübingen, Tübingen, Germany
| | - Nicole Gerardo
- Department of Biology, Emory University, Atlanta, Georgia, USA
| |
Collapse
|
3
|
Cardoso DC, Baldez BCL, Pereira AH, Kalapothakis E, Rosse IC, Cristiano MP. De novo assembly of the complete mitochondrial genome of Mycetophylax simplex Emery, 1888 through organelle targeting revels no substantial expansion of gene spacers, but rather some slightly shorter genes. Mol Genet Genomics 2024; 299:16. [PMID: 38411741 DOI: 10.1007/s00438-024-02099-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Accepted: 12/10/2023] [Indexed: 02/28/2024]
Abstract
Mitochondria play a key role in cell biology and have their own genome, residing in a highly oxidative environment that induces faster changes than the nuclear genome. Because of this, mitochondrial markers have been exploited to reconstruct phylogenetic and phylogeographic relationships in studies of adaptation and molecular evolution. In this study, we determined the complete mitogenome of the fungus-farming ant Mycetophylax simplex (Hymenoptera, Formicidae) and conducted a comparative analysis among 29 myrmicine ant mitogenomes. Mycetophylax simplex is an endemic ant that inhabits sand dunes along the southern Atlantic coast. Specifically, the species occur in the ecosystem known as "restinga", within the Atlantic Forest biome. Due to habitat degradation, land use and decline of restinga habitats, the species is considered locally extinct in extremely urban beaches and is listed as vulnerable on the Brazilian Red List (ICMBio). We employed a mitochondrion-targeting approach to obtain the complete mitogenome through high-throughput DNA sequencing technology. This method allowed us to determine the mitogenome with high performance, coverage and low cost. The circular mitogenome has a length of 16,367 base pairs enclosing 37 genes (13 protein-coding genes, 22 tRNAs and 2 rRNAs) along with one control region (CR). All the protein-coding genes begin with a typical ATN codon and end with the canonical stop codons. All tRNAs formed the fully paired acceptor stems and fold into the typical cloverleaf-shaped secondary structures. The gene order is consistent with the shared Myrmicinae structure, and the A + T content of the majority strand is 81.51%. Long intergenic spacers were not found but some gene are slightly shorter. The phylogenetic relationships based on concatenated nucleotide and amino acid sequences of the 13 protein-coding genes, using Maximum Likelihood and Bayesian Inference methods, indicated that mitogenome sequences were useful in resolving higher-level relationship within Formicidae.
Collapse
Affiliation(s)
- Danon Clemes Cardoso
- Genetics and Evolution of Ants Research Group - GEF, Universidade Federal de Ouro Preto, Ouro Preto, Mina Gerais, 35400-000, Brazil.
| | - Brenda Carla Lima Baldez
- Programa de Pós-Graduação em Ecologia de Biomas Tropicais, Universidade Federal de Ouro Preto, Ouro Preto, Mina Gerais, 35400-000, Brazil
| | - Adriana Heloísa Pereira
- Departamento de Genética, Ecologia e Evolução, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, 31270-010, Brazil
| | - Evanguedes Kalapothakis
- Departamento de Genética, Ecologia e Evolução, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, 31270-010, Brazil
| | - Izinara Cruz Rosse
- Departamento de Farmácia, Escola de Farmácia, Universidade Federal de Ouro Preto, Ouro Preto, Minas Gerais, 35400-000, Brazil
| | - Maykon Passos Cristiano
- Genetics and Evolution of Ants Research Group - GEF, Universidade Federal de Ouro Preto, Ouro Preto, Mina Gerais, 35400-000, Brazil
| |
Collapse
|
4
|
Dourado LA, Oliveira LL, Raimundo APP, Cossolin JFS, Oliveira JFD, Serrão JE. Hemocyte morphology of worker subcastes of the leaf-cutting ant Atta sexdens rubropilosa (Hymenoptera: Formicidae). ARTHROPOD STRUCTURE & DEVELOPMENT 2023; 76:101301. [PMID: 37660416 DOI: 10.1016/j.asd.2023.101301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 08/10/2023] [Accepted: 08/23/2023] [Indexed: 09/05/2023]
Abstract
Hemocytes are cells present in the hemolymph of insects that play a role in combating invasive pathogens, ensuring defense by the immune system in these organisms. While the types of hemocytes are well known in some insect representatives, data on these cells in Hymenoptera are limited to certain bees and wasps, with little information available for ants. Among ants, the genus Atta has environmental and economic importance, forming highly organized colonies consisting of the queen and workers, with the latter subdivided into subcastes: gardeners, waste removers, foragers, and soldiers, which are exposed to different pathogens. This study describes the morphology of hemocytes in the worker subcastes of Atta sexdens rubropilosa. Hemolymph samples from the ant were submitted to light, confocal, and scanning electron microscopy analyses. Five types of hemocytes were identified in the hemolymph of all ant subcastes, including prohemocytes, oenocytoids, spherulocytes, plasmatocytes, and granulocytes. They exhibited nuclei with a predominance of decondensed chromatin. The granulocytes were the most abundant cell type in the subcastes, followed by prohemocytes, plasmatocytes, oenocytoids, and spherulocytes. Phagocytosis assays reveal that plasmatocytes and granulocytes are the main phagocytic cells in all castes evaluated. This study fills an important gap in understanding the immune response in this ant species.
Collapse
Affiliation(s)
- Lidia Aparecida Dourado
- Department of General Biology, Instituto de Bitecnologia Aplicada à Agropecuária, Federal University of Viçosa, Viçosa, Brazil
| | - Leandro Licursi Oliveira
- Department of General Biology, Instituto de Bitecnologia Aplicada à Agropecuária, Federal University of Viçosa, Viçosa, Brazil
| | - Ana Paula Pereira Raimundo
- Department of General Biology, Instituto de Bitecnologia Aplicada à Agropecuária, Federal University of Viçosa, Viçosa, Brazil
| | - Jamile Fernanda Silva Cossolin
- Department of General Biology, Instituto de Bitecnologia Aplicada à Agropecuária, Federal University of Viçosa, Viçosa, Brazil
| | | | - José Eduardo Serrão
- Department of General Biology, Instituto de Bitecnologia Aplicada à Agropecuária, Federal University of Viçosa, Viçosa, Brazil.
| |
Collapse
|
5
|
Dejean A, Azémar F, Naskrecki P, Tindo M, Rossi V, Faucher C, Gryta H. Mutualistic interactions between ants and fungi: A review. Ecol Evol 2023; 13:e10386. [PMID: 37529578 PMCID: PMC10375366 DOI: 10.1002/ece3.10386] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Revised: 07/19/2023] [Accepted: 07/20/2023] [Indexed: 08/03/2023] Open
Abstract
The large amount of dead plant biomass caused by the final extinction events triggered a fungi proliferation that mostly differentiated into saprophytes degrading organic matter; others became parasites, predators, likely commensals, and mutualists. Among the last, many have relationships with ants, the most emblematic seen in the Neotropical myrmicine Attina that cultivate Basidiomycota for food. Among them, leaf-cutting, fungus-growing species illustrate an ecological innovation because they grow fungal gardens from fresh plant material rather than arthropod frass and plant debris. Myrmecophytes shelter "plant-ants" in hollow structures, the domatia, whose inner walls are lined with thin-walled Ascomycota hyphae that, in certain cases, are eaten by the ants, showing a form of convergence. Typically, these Ascomycota have antibacterial properties illustrating cases of farming for protection. Ant gardens, or mutualistic associations between certain ant species and epiphytes, shelter endophytic fungi that promote the growth of the epiphytes. Because the cell walls of certain Ascomycota hyphae remain sturdy after the death of the mycelium, they form resistant fibers used by ants to reinforce their constructions (e.g., galleries, shelters for tended hemipterans, and carton nests). Thus, we saw cases of "true" fungal agriculture involving planting, cultivating, and harvesting Basidiomycota for food with Attina. A convergence with "plant-ants" feeding on Ascomycota whose antibacterial activity is generally exploited (i.e., farming for protection). The growth of epiphytes was promoted by endophytic fungi in ant gardens. Finally, farming for structural materials occurred with, in one case, a leaf-cutting, fungus-growing ant using Ascomycota fibers to reinforce its nests.
Collapse
Affiliation(s)
- Alain Dejean
- Laboratoire Écologie Fonctionnelle et EnvironnementUniversité de Toulouse, CNRS, Toulouse INP, Université Toulouse 3 – Paul Sabatier (UPS)ToulouseFrance
- UMR EcoFoG, AgroParisTechCirad, CNRS, INRA, Université des Antilles, Université de GuyaneKourouFrance
| | - Frédéric Azémar
- Laboratoire Écologie Fonctionnelle et EnvironnementUniversité de Toulouse, CNRS, Toulouse INP, Université Toulouse 3 – Paul Sabatier (UPS)ToulouseFrance
| | - Piotr Naskrecki
- Museum of Comparative ZoologyHarvard UniversityCambridgeMassachusettsUSA
| | - Maurice Tindo
- Laboratory of Biology and Physiology of Animal Organisms, Faculty of ScienceUniversity of DoualaDoualaCameroon
| | - Vivien Rossi
- Remote Sensing and Forest Ecology Lab, Higher Teacher's Training CollegeMarien Ngouabi UniversityBrazzavilleDemocratic Republic of the Congo
- R U Forests and Societies, CIRADBrazzavilleDemocratic Republic of the Congo
| | - Christian Faucher
- Laboratoire Evolution & Diversité Biologique (EDB UMR 5174) CNRSIRD, Université Toulouse 3ToulouseFrance
| | - Hervé Gryta
- Laboratoire Evolution & Diversité Biologique (EDB UMR 5174) CNRSIRD, Université Toulouse 3ToulouseFrance
| |
Collapse
|
6
|
Dejean A, Naskrecki P, Faucher C, Azémar F, Tindo M, Manzi S, Gryta H. An Old World leaf-cutting, fungus-growing ant: A case of convergent evolution. Ecol Evol 2023; 13:e9904. [PMID: 36937071 PMCID: PMC10015377 DOI: 10.1002/ece3.9904] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Revised: 02/18/2023] [Accepted: 02/28/2023] [Indexed: 03/17/2023] Open
Abstract
The African myrmicine ant Crematogaster clariventris is a territorially dominant arboreal species that constructs very hard carton nests. Noting that workers cut off leaves from different plant species while building or repairing their nests, we asked ourselves if there was a correlation. We conducted scanning electron microscopic observations of nest walls that revealed the presence of fungal mycelia. As the presence of filamentous Ascomycota has been shown on arboreal ant nests worldwide, we used a metabarcoding approach and, indeed, noted the presence of Operational Taxonomic Unit (OTU) Cre_006041 of the Capnodiales known to reinforce large nests of an unidentified African Crematogaster. This OTU was also recorded in the workers' bodies. At a very low level, we also noted OTU Cre_320021 of the Chaetothyriales known for their relationships with the African plant-ant species C. margaritae. Therefore, by cutting leaves and growing fungus, C. clariventris illustrates a case of convergent evolution with higher New World leaf-cutting, fungus-growing Attina of the genera Acromyrmex, Amoimyrmex and Atta. However, there are notable differences. Leaf-cutting Attina cultivate Agaricaceae (Basidiomycota) for food, whereas C. clariventris uses Capnodiales to reinforce their nests (i.e., after the mycelium died, the hyphae's cell walls remained sturdy forming a natural composite material), have a distinct geographical origin (i.e., New World vs. Old World) and belong to a distinct ant tribe in the subfamily Myrmicinae (i.e., Attini vs. Crematogastrini). Furthermore, leaf-cutting Attina evolved an efficacious means of cutting leaves by using their mandibles asymmetrically, whereas C. clariventris workers, typically, use their mandibles symmetrically.
Collapse
Affiliation(s)
- A Dejean
- Laboratoire écologie fonctionnelle et environnement Université de Toulouse, CNRS, Toulouse INP, Université Toulouse 3 - Paul Sabatier (UPS) Toulouse France
- UMR EcoFoG, AgroParisTech, Cirad, CNRS, INRA Université des Antilles, Université de Guyane Kourou France
| | - P Naskrecki
- Museum of Comparative Zoology Harvard University Cambridge Massachusetts USA
| | - C Faucher
- Laboratoire Evolution & Diversité Biologique, Université de Toulouse, CNRS, IRD Université Toulouse 3 - Paul Sabatier, 118 route de Narbonne Toulouse France
| | - F Azémar
- Laboratoire écologie fonctionnelle et environnement Université de Toulouse, CNRS, Toulouse INP, Université Toulouse 3 - Paul Sabatier (UPS) Toulouse France
| | - M Tindo
- Laboratory of Animal Biology and Physiology, Faculty of Science University of Douala Douala Cameroon
| | - S Manzi
- Laboratoire Evolution & Diversité Biologique, Université de Toulouse, CNRS, IRD Université Toulouse 3 - Paul Sabatier, 118 route de Narbonne Toulouse France
- Present address: Institut de Pharmacologie et de Biologie Structurale (IPBS), CNRS Université Toulouse Toulouse Cedex France
| | - H Gryta
- Laboratoire Evolution & Diversité Biologique, Université de Toulouse, CNRS, IRD Université Toulouse 3 - Paul Sabatier, 118 route de Narbonne Toulouse France
| |
Collapse
|
7
|
Muñoz-Valencia V, Montoya-Lerma J, Seppä P, Diaz F. Landscape genetics across the Andes mountains: Environmental variation drives genetic divergence in the leaf-cutting ant Atta cephalotes. Mol Ecol 2023; 32:95-109. [PMID: 36261873 DOI: 10.1111/mec.16742] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2022] [Revised: 10/07/2022] [Accepted: 10/17/2022] [Indexed: 12/29/2022]
Abstract
Distinguishing among the mechanisms underlying the spatial distribution of genetic variation resulting from the environmental or physical barriers from those arising due to simple geographic distance is challenging in complex landscapes. The Andean uplift represents one of the most heterogeneous habitats where multiple mechanisms may interact, confounding their relative roles. We explore this broad question in the leaf-cutting ant Atta cephalotes, a species that is distributed across the Andes mountains, using nuclear microsatellite markers and mtCOI gene sequences. We investigate spatial genetic divergence across the western range of the northern Andes in Colombia by testing the relative role of alternative scenarios of population divergence, including isolation by geographic distance (IBD), climatic conditions (IBE), and the physical barriers presented by the Andes mountains (IBB). Our results reveal substantial genetic differentiation among A. cephalotes populations for both types of markers, but only nuclear divergence followed a hierarchical pattern with multiple models of genetic divergence imposed by the western range. Model selection showed that the IBD, IBE (temperature and precipitation), and IBB (Andes mountains) models, often proposed as individual drivers of genetic divergence, interact, and explain up to 33% of the genetic divergence in A. cephalotes. The IBE model remained significant after accounting for IBD, suggesting that environmental factors play a more prominent role than IBB. These factors, in combination with the idiosyncratic dispersal patterns of ants, appear to determine the hierarchical patterns of gene flow. This study enriches our understanding of the forces shaping population divergence in complex habitat landscapes.
Collapse
Affiliation(s)
- Vanessa Muñoz-Valencia
- Group of Agroecosystem Ecology and Natural Habitats, Department of Biology, Faculty of Natural Science, Universidad del Valle, Cali, Colombia
| | - James Montoya-Lerma
- Group of Agroecosystem Ecology and Natural Habitats, Department of Biology, Faculty of Natural Science, Universidad del Valle, Cali, Colombia
| | - Perttu Seppä
- Organismal and Evolutionary Biology Research Programme, Faculty of Biological and Environmental Sciences, University of Helsinki, Helsinki, Finland
| | - Fernando Diaz
- Biology Department, Colgate University, New York, USA
| |
Collapse
|
8
|
Gotting K, May DS, Sosa-Calvo J, Khadempour L, Francoeur CB, Berasategui A, Thairu MW, Sandstrom S, Carlson CM, Chevrette MG, Pupo MT, Bugni TS, Schultz TR, Johnston JS, Gerardo NM, Currie CR. Genomic diversification of the specialized parasite of the fungus-growing ant symbiosis. Proc Natl Acad Sci U S A 2022; 119:e2213096119. [PMID: 36508678 PMCID: PMC9907069 DOI: 10.1073/pnas.2213096119] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Accepted: 10/20/2022] [Indexed: 12/15/2022] Open
Abstract
Fungi shape the diversity of life. Characterizing the evolution of fungi is critical to understanding symbiotic associations across kingdoms. In this study, we investigate the genomic and metabolomic diversity of the genus Escovopsis, a specialized parasite of fungus-growing ant gardens. Based on 25 high-quality draft genomes, we show that Escovopsis forms a monophyletic group arising from a mycoparasitic fungal ancestor 61.82 million years ago (Mya). Across the evolutionary history of fungus-growing ants, the dates of origin of most clades of Escovopsis correspond to the dates of origin of the fungus-growing ants whose gardens they parasitize. We reveal that genome reduction, determined by both genomic sequencing and flow cytometry, is a consistent feature across the genus Escovopsis, largely occurring in coding regions, specifically in the form of gene loss and reductions in copy numbers of genes. All functional gene categories have reduced copy numbers, but resistance and virulence genes maintain functional diversity. Biosynthetic gene clusters (BGCs) contribute to phylogenetic differences among Escovopsis spp., and sister taxa in the Hypocreaceae. The phylogenetic patterns of co-diversification among BGCs are similarly exhibited across mass spectrometry analyses of the metabolomes of Escovopsis and their sister taxa. Taken together, our results indicate that Escovopsis spp. evolved unique genomic repertoires to specialize on the fungus-growing ant-microbe symbiosis.
Collapse
Affiliation(s)
- Kirsten Gotting
- Department of Bacteriology, University of Wisconsin-Madison, Madison, WI53706
- Laboratory of Genetics, University of Wisconsin-Madison, Madison, WI53706
| | - Daniel S. May
- Department of Bacteriology, University of Wisconsin-Madison, Madison, WI53706
| | - Jeffrey Sosa-Calvo
- Department of Entomology, National Museum of Natural History, Smithsonian Institution, Washington, DC20560
| | - Lily Khadempour
- Department of Earth and Environmental Sciences, Rutgers University, Newark, NJ07102
| | | | | | - Margaret W. Thairu
- Department of Bacteriology, University of Wisconsin-Madison, Madison, WI53706
| | - Shelby Sandstrom
- Department of Bacteriology, University of Wisconsin-Madison, Madison, WI53706
| | - Caitlin M. Carlson
- Department of Bacteriology, University of Wisconsin-Madison, Madison, WI53706
| | - Marc G. Chevrette
- Wisconsin Institute for Discovery, University of Wisconsin-Madison, Madison, WI53705
- Department of Plant Pathology, University of Wisconsin-Madison, Madison, WI53705
| | - Mônica T. Pupo
- School of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP14040-903, Brazil
| | - Tim S. Bugni
- Pharmaceutical Sciences Division, School of Pharmacy, University of Wisconsin-Madison, Madison, WI53705
| | - Ted R. Schultz
- Department of Entomology, National Museum of Natural History, Smithsonian Institution, Washington, DC20560
| | | | | | - Cameron R. Currie
- Department of Bacteriology, University of Wisconsin-Madison, Madison, WI53706
- David Braley Centre for Antibiotic Discovery, Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| |
Collapse
|
9
|
Cardenas CR, Mularo AJ, Chavez AS, Adams RMM. Limited genetic differentiation of
Mycetomoellerius mikromelanos
in Parque National Soberanía, Panama: Implications for queen dispersal. Biotropica 2022. [DOI: 10.1111/btp.13171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Cody Raul Cardenas
- Department of Evolution Ecology and Organismal Biology & Museum of Biological Diversity The Ohio State University Columbus Ohio USA
- Muséum d'Histoire Naturelle de la Ville de Genève Geneva Switzerland
- Université de Genève Faculté des Sciences Life Sciences PhD School Ecology and Evolution Geneva Switzerland
| | - Andrew J. Mularo
- Department of Evolution Ecology and Organismal Biology & Museum of Biological Diversity The Ohio State University Columbus Ohio USA
- Department of Biological Sciences Purdue University West Lafayette Indiana USA
| | - Andreas S. Chavez
- Department of Evolution Ecology and Organismal Biology & Museum of Biological Diversity The Ohio State University Columbus Ohio USA
- Translational Data Analytics Institute The Ohio State University Columbus Ohio USA
| | - Rachelle M. M. Adams
- Department of Evolution Ecology and Organismal Biology & Museum of Biological Diversity The Ohio State University Columbus Ohio USA
- Department of Entomology National Museum of Natural History Smithsonian Institution Washington District of Colombia USA
| |
Collapse
|
10
|
Bizarria R, de Castro Pietrobon T, Rodrigues A. Uncovering the Yeast Communities in Fungus-Growing Ant Colonies. MICROBIAL ECOLOGY 2022:10.1007/s00248-022-02099-1. [PMID: 35962280 DOI: 10.1007/s00248-022-02099-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Accepted: 08/03/2022] [Indexed: 06/15/2023]
Abstract
Yeast-insect interactions are compelling models to study the evolution, ecology, and diversification of yeasts. Fungus-growing (attine) ants are prominent insects in the Neotropics that evolved an ancient fungiculture of basidiomycete fungi over 55-65 million years, supplying an environment for a hidden yeast diversity. Here we assessed the yeast diversity in the attine ant environment by thoroughly sampling fungus gardens across four out of five ant fungiculture systems: Acromyrmex coronatus and Mycetomoellerius tucumanus standing for leaf-cutting and higher-attine fungicultures, respectively; Apterostigma sp., Mycetophylax sp., and Mycocepurus goeldii as ants from the lower-attine fungiculture. Among the fungus gardens of all fungus-growing ants examined, we found taxonomically unique and diverse microbial yeast communities across the different fungicultures. Ascomycete yeasts were the core taxa in fungus garden samples, with Saccharomycetales as the most frequent order. The genera Aureobasidium, Candida, Papiliotrema, Starmerella, and Sugiyamaella had the highest incidence in fungus gardens. Despite the expected similarity within the same fungiculture system, colonies of the same ant species differed in community structure. Among Saccharomycotina yeasts, few were distinguishable as killer yeasts, with a classical inhibition pattern for the killer phenotype, differing from earlier observations in this environment, which should be further investigated. Yeast mycobiome in fungus gardens is distinct between colonies of the same fungiculture and each ant colony harbors a distinguished and unique yeast community. Fungus gardens of attine ants are emergent environments to study the diversity and ecology of yeasts associated with insects.
Collapse
Affiliation(s)
- Rodolfo Bizarria
- Department of General and Applied Biology, São Paulo State University (UNESP), Bela Vista, Avenida 24-A, n. 1515SP 13.506-900, Rio Claro, Brazil
- Center for the Study of Social Insects, São Paulo State University (UNESP), Rio Claro, SP, Brazil
| | - Tatiane de Castro Pietrobon
- Department of General and Applied Biology, São Paulo State University (UNESP), Bela Vista, Avenida 24-A, n. 1515SP 13.506-900, Rio Claro, Brazil
- Center for the Study of Social Insects, São Paulo State University (UNESP), Rio Claro, SP, Brazil
| | - Andre Rodrigues
- Department of General and Applied Biology, São Paulo State University (UNESP), Bela Vista, Avenida 24-A, n. 1515SP 13.506-900, Rio Claro, Brazil.
- Center for the Study of Social Insects, São Paulo State University (UNESP), Rio Claro, SP, Brazil.
| |
Collapse
|
11
|
Abstract
Within social insect colonies, microbiomes often differ between castes due to their different functional roles and between colony locations. Trachymyrmex septentrionalis fungus-growing ants form colonies throughout the eastern United States and northern Mexico that include workers, female and male alates (unmated reproductive castes), larvae, and pupae. How T. septentrionalis microbiomes vary across this geographic range and between castes is unknown. Our sampling of individual ants from colonies across the eastern United States revealed a conserved T. septentrionalis worker ant microbiome and revealed that worker ant microbiomes are more conserved within colonies than between them. A deeper sampling of individual ants from two colonies that included all available castes (pupae, larvae, workers, and female and male alates), from both before and after adaptation to controlled laboratory conditions, revealed that ant microbiomes from each colony, caste, and rearing condition were typically conserved within but not between each sampling category. Tenericute bacterial symbionts were especially abundant in these ant microbiomes and varied widely in abundance between sampling categories. This study demonstrates how individual insect colonies primarily drive the composition of their microbiomes and shows that these microbiomes are further modified by developmental differences between insect castes and the different environmental conditions experienced by each colony. IMPORTANCE This study investigates microbiome assembly in the fungus-growing ant Trachymyrmex septentrionalis, showing how colony, caste, and lab adaptation influence the microbiome and revealing unique patterns of mollicute symbiont abundance. We find that ant microbiomes differ strongly between colonies but less so within colonies. Microbiomes of different castes and following lab adaptation also differ in a colony-specific manner. This study advances our understanding of the nature of individuality in social insect microbiomes and cautions against the common practice of only sampling a limited number of populations to understand microbiome diversity and function.
Collapse
|
12
|
Senula SF, Scavetta JT, Mueller UG, Seal JN, Kellner K. Cold adaptations along a range limit in an obligate symbiosis. Funct Ecol 2022. [DOI: 10.1111/1365-2435.14120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- S. F. Senula
- Department of Biology, The University of Texas at Tyler 3900 University Blvd. Tyler Texas
| | - J. T. Scavetta
- Department of Computer Science Rowan University Glassboro NJ USA
| | - U. G. Mueller
- Department of Integrative Biology University of Texas at Austin Austin TX USA
| | - J. N. Seal
- Department of Biology, The University of Texas at Tyler 3900 University Blvd. Tyler Texas
| | - K. Kellner
- Department of Biology, The University of Texas at Tyler 3900 University Blvd. Tyler Texas
| |
Collapse
|
13
|
Barcoto MO, Rodrigues A. Lessons From Insect Fungiculture: From Microbial Ecology to Plastics Degradation. Front Microbiol 2022; 13:812143. [PMID: 35685924 PMCID: PMC9171207 DOI: 10.3389/fmicb.2022.812143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Accepted: 03/15/2022] [Indexed: 11/13/2022] Open
Abstract
Anthropogenic activities have extensively transformed the biosphere by extracting and disposing of resources, crossing boundaries of planetary threat while causing a global crisis of waste overload. Despite fundamental differences regarding structure and recalcitrance, lignocellulose and plastic polymers share physical-chemical properties to some extent, that include carbon skeletons with similar chemical bonds, hydrophobic properties, amorphous and crystalline regions. Microbial strategies for metabolizing recalcitrant polymers have been selected and optimized through evolution, thus understanding natural processes for lignocellulose modification could aid the challenge of dealing with the recalcitrant human-made polymers spread worldwide. We propose to look for inspiration in the charismatic fungal-growing insects to understand multipartite degradation of plant polymers. Independently evolved in diverse insect lineages, fungiculture embraces passive or active fungal cultivation for food, protection, and structural purposes. We consider there is much to learn from these symbioses, in special from the community-level degradation of recalcitrant biomass and defensive metabolites. Microbial plant-degrading systems at the core of insect fungicultures could be promising candidates for degrading synthetic plastics. Here, we first compare the degradation of lignocellulose and plastic polymers, with emphasis in the overlapping microbial players and enzymatic activities between these processes. Second, we review the literature on diverse insect fungiculture systems, focusing on features that, while supporting insects' ecology and evolution, could also be applied in biotechnological processes. Third, taking lessons from these microbial communities, we suggest multidisciplinary strategies to identify microbial degraders, degrading enzymes and pathways, as well as microbial interactions and interdependencies. Spanning from multiomics to spectroscopy, microscopy, stable isotopes probing, enrichment microcosmos, and synthetic communities, these strategies would allow for a systemic understanding of the fungiculture ecology, driving to application possibilities. Detailing how the metabolic landscape is entangled to achieve ecological success could inspire sustainable efforts for mitigating the current environmental crisis.
Collapse
Affiliation(s)
- Mariana O. Barcoto
- Center for the Study of Social Insects, São Paulo State University (UNESP), Rio Claro, Brazil
- Department of General and Applied Biology, São Paulo State University (UNESP), Rio Claro, Brazil
| | - Andre Rodrigues
- Center for the Study of Social Insects, São Paulo State University (UNESP), Rio Claro, Brazil
- Department of General and Applied Biology, São Paulo State University (UNESP), Rio Claro, Brazil
| |
Collapse
|
14
|
Weinstein SB, Stephens WZ, Greenhalgh R, Round JL, Dearing MD. Wild herbivorous mammals (genus Neotoma) host a diverse but transient assemblage of fungi. Symbiosis 2022; 87:45-58. [PMID: 37915425 PMCID: PMC10619970 DOI: 10.1007/s13199-022-00853-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2022] [Accepted: 06/14/2022] [Indexed: 10/16/2022]
Abstract
Fungi are often overlooked in microbiome research and, as a result, little is known about the mammalian mycobiome. Although frequently detected in vertebrate guts and known to contribute to digestion in some herbivores, whether these eukaryotes are a persistent part of the mammalian gut microbiome remains contentious. To address this question, we sampled fungi from wild woodrats (Neotoma spp.) collected from 25 populations across the southwestern United States. For each animal, we collected a fecal sample in the wild, and then re-sampled the same individual after a month in captivity on a controlled diet. We characterized and quantified fungi using three techniques: ITS metabarcoding, shotgun metagenomics and qPCR. Wild individuals contained diverse fungal assemblages dominated by plant pathogens, widespread molds, and coprophilous taxa primarily in Ascomycota and Mucoromycota. Fungal abundance, diversity and composition differed between individuals, and was primarily influenced by animal geographic origin. Fungal abundance and diversity significantly declined in captivity, indicating that most fungi in wild hosts came from diet and environmental exposure. While this suggests that these mammals lack a persistent gut mycobiome, natural fungal exposure may still impact fungal dispersal and animal health.
Collapse
Affiliation(s)
- Sara B. Weinstein
- School of Biological Sciences, University of Utah, Salt Lake City, UT, USA
| | - W. Zac Stephens
- University of Utah School of Medicine, Department of Pathology, Division of Microbiology and Immunology, Salt Lake City, UT, USA
| | - Robert Greenhalgh
- School of Biological Sciences, University of Utah, Salt Lake City, UT, USA
| | - June L. Round
- University of Utah School of Medicine, Department of Pathology, Division of Microbiology and Immunology, Salt Lake City, UT, USA
| | - M. Denise Dearing
- School of Biological Sciences, University of Utah, Salt Lake City, UT, USA
| |
Collapse
|
15
|
Cardoso DC, Cristiano MP. Karyotype Diversity, Mode, and Tempo of the Chromosomal Evolution of Attina (Formicidae: Myrmicinae: Attini): Is There an Upper Limit to Chromosome Number? INSECTS 2021; 12:insects12121084. [PMID: 34940172 PMCID: PMC8707115 DOI: 10.3390/insects12121084] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Revised: 11/29/2021] [Accepted: 11/30/2021] [Indexed: 12/02/2022]
Abstract
Simple Summary Ants are an important insect group that includes a considerable number of species. Along with this diversity in species, they also exhibit a wide variation in chromosome numbers, from 1 up to 60 chromosomes. DNA molecules can be counted in a specific stage of the cell life cycle and quantified. These DNA molecules are very tightly packed together with several proteins and are called chromosomes. Each species shows a specific number of chromosomes with different shapes and sizes, as well as different quantities of DNA. We can use such information (the number of chromosomes, shape of the chromosomes, and quantity of DNA) as morphological attributes to study evolution at the species level. In this study, we describe new karyotypes of several ant species. In addition, from previous studies, we have compiled all the available information regarding the chromosome number and DNA quantity in fungus-farming ant cells. Different processes, called rearrangements, can change chromosomes over time, producing new character states. Such states can be tracked, along with the species and groups of similar species, using their relationships to identify patterns. We use DNA sequences to reconstruct the relationships of fungus-farming ant species (molecular phylogeny). By comparing such phylogeny with the chromosome number and DNA quantity, we discuss the evolution of chromosomes and DNA quantity (or genome size), and the potential limits to these features across fungus-farming ants. Abstract Ants are an important insect group that exhibits considerable diversity in chromosome numbers. Some species show only one chromosome, as in the males of the Australian bulldog ant Myrmecia croslandi, while some have as many as 60 chromosomes, as in the males of the giant Neotropical ant Dinoponera lucida. Fungus-growing ants are a diverse group in the Neotropical ant fauna, engaged in a symbiotic relationship with a basidiomycete fungus, and are widely distributed from Nearctic to Neotropical regions. Despite their importance, new chromosome counts are scarcely reported, and the marked variation in chromosome number across species has been poorly studied under phylogenetic and genome evolutionary contexts. Here, we present the results of the cytogenetic examination of fungus-farming ants and compile the cytogenetic characteristics and genome size of the species studied to date to draw insights regarding the evolutionary paths of karyotype changes and diversity. These data are coupled with a fossil-calibrated phylogenetic tree to discuss the mode and tempo of chromosomal shifting, considering whether there is an upper limit for chromosome number and genome size in ants, using fungus-farming ants as a model study. We recognize that karyotypes are generally quite variable across fungus-farming ant phylogeny, mostly between genera, and are more numerically conservative within genera. A low chromosome number, between 10 and 12 chromosomes, seems to present a notable long-term evolutionary stasis (intermediate evolutionary stasis) in fungus-farming ants. All the genome size values were inside a limited spectrum below 1 pg. Eventual departures in genome size occurred with regard to the mean of 0.38 pg, indicating that there is a genome, and likely a chromosome, number upper limit.
Collapse
|
16
|
Muñoz‐Valencia V, Vélez‐Martínez GA, Montoya‐Lerma J, Díaz F. Role of the Andean uplift as an asymmetrical barrier to gene flow in the neotropical leaf‐cutting ant
Atta cephalotes. Biotropica 2021. [DOI: 10.1111/btp.13050] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Vanessa Muñoz‐Valencia
- Grupo de Ecología de Agroecosistemas y Hábitats Naturales Universidad del Valle Cali, Valle del Cauca Colombia
| | | | - James Montoya‐Lerma
- Grupo de Ecología de Agroecosistemas y Hábitats Naturales Universidad del Valle Cali, Valle del Cauca Colombia
| | - Fernando Díaz
- Biology Department Colgate University Hamilton New York USA
| |
Collapse
|
17
|
Bollazzi M, Römer D, Roces F. Carbon dioxide levels and ventilation in Acromyrmex nests: significance and evolution of architectural innovations in leaf-cutting ants. ROYAL SOCIETY OPEN SCIENCE 2021; 8:210907. [PMID: 34849241 PMCID: PMC8611346 DOI: 10.1098/rsos.210907] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Accepted: 10/15/2021] [Indexed: 06/13/2023]
Abstract
Leaf-cutting ant colonies largely differ in size, yet all consume O2 and produce CO2 in large amounts because of their underground fungus gardens. We have shown that in the Acromyrmex genus, three basic nest morphologies occur, and investigated the effects of architectural innovations on nest ventilation. We recognized (i) serial nests, similar to the ancestral type of the sister genus Trachymyrmex, with chambers excavated along a vertical tunnel connecting to the outside via a single opening, (ii) shallow nests, with one/few chambers extending shallowly with multiple connections to the outside, and (iii) thatched nests, with an above-ground fungus garden covered with plant material. Ventilation in shallow and thatched nests, but not in serial nests, occurred via wind-induced flows and thermal convection. CO2 concentrations were below the values known to affect the respiration of the symbiotic fungus, indicating that shallow and thatched nests are not constrained by harmful CO2 levels. Serial nests may be constrained depending on the soil CO2 levels. We suggest that in Acromyrmex, selective pressures acting on temperature and humidity control led to nesting habits closer to or above the soil surface and to the evolution of architectural innovations that improved gas exchanges.
Collapse
Affiliation(s)
- Martin Bollazzi
- Entomología, Facultad de Agronomía, Universidad de la República, Av. Garzon 780, Montevideo 12900, Uruguay
| | - Daniela Römer
- Entomología, Facultad de Agronomía, Universidad de la República, Av. Garzon 780, Montevideo 12900, Uruguay
- Department of Behavioral Physiology and Sociobiology, Biocenter, University of Würzburg, Am Hubland, Würzburg 97074, Germany
| | - Flavio Roces
- Department of Behavioral Physiology and Sociobiology, Biocenter, University of Würzburg, Am Hubland, Würzburg 97074, Germany
| |
Collapse
|
18
|
Bizarria R, Kooij PW, Rodrigues A. Climate Change Influences Basidiome Emergence of Leaf-Cutting Ant Cultivars. J Fungi (Basel) 2021; 7:912. [PMID: 34829201 PMCID: PMC8623619 DOI: 10.3390/jof7110912] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2021] [Revised: 10/15/2021] [Accepted: 10/21/2021] [Indexed: 11/17/2022] Open
Abstract
Maintaining symbiosis homeostasis is essential for mutualistic partners. Leaf-cutting ants evolved a long-term symbiotic mutualism with fungal cultivars for nourishment while using vertical asexual transmission across generations. Despite the ants' efforts to suppress fungal sexual reproduction, scattered occurrences of cultivar basidiomes have been reported. Here, we review the literature for basidiome occurrences and associated climate data. We hypothesized that more basidiome events could be expected in scenarios with an increase in temperature and precipitation. Our field observations and climate data analyses indeed suggest that Acromyrmex coronatus colonies are prone to basidiome occurrences in warmer and wetter seasons. Even though our study partly depended on historical records, occurrences have increased, correlating with climate change. A nest architecture with low (or even the lack of) insulation might be the cause of this phenomenon. The nature of basidiome occurrences in the A. coronatus-fungus mutualism can be useful to elucidate how resilient mutualistic symbioses are in light of climate change scenarios.
Collapse
Affiliation(s)
- Rodolfo Bizarria
- Department of General and Applied Biology, São Paulo State University (UNESP), Rio Claro 13506-900, SP, Brazil
| | - Pepijn W. Kooij
- Department of General and Applied Biology, São Paulo State University (UNESP), Rio Claro 13506-900, SP, Brazil
| | - Andre Rodrigues
- Department of General and Applied Biology, São Paulo State University (UNESP), Rio Claro 13506-900, SP, Brazil
| |
Collapse
|
19
|
Micolino R, Baldez BCL, Sánchez-Restrepo AF, Calcaterra L, Cristiano MP, Cardoso DC. Karyotype structure and cytogenetic markers of Amoimyrmex bruchi and Amoimyrmex silvestrii: contribution to understanding leaf-cutting ant relationships. Genome 2021; 65:1-9. [PMID: 34520688 DOI: 10.1139/gen-2021-0044] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Leaf-cutting ants are considered the most important herbivores in terrestrial environments throughout the Neotropics. Amoimyrmex Cristiano, Cardoso, & Sandoval, 2020 is the sister clade of the remaining leaf-cutting ants from the genera Atta and Acromyrmex. Amoimyrmex striatus was the only species cytogenetically studied within the genus and shares the same chromosomal number as Atta, bearing 22 chromosomes, whereas Acromyrmex bears 38 chromosomes, with the exception of the social parasite Acromyrmex ameliae (2n = 36). Our objective here was to cytogenetically analyze the species of Amoimyrmex bruchi and Amoimyrmex silvestrii, as well as to describe the karyotype of these sister species, using an integrative approach using classical and molecular cytogenetics. We aimed to characterize the cytogenetic markers that contribute to the systematics and taxonomy of the genus. Our results showed that the karyotypes of these two species are very similar, with an identical chromosome number (2n = 22), chromosome morphology (2K = 20m + 2sm), and location of 18S rDNA and telomeric repeat TTAGG on the chromosomes. However, the microsatellite probe GA(15) showed variation across the species and populations studied. We suggest that both species diverged relatively recently and are unmistakably sisters because of the many shared characteristics, including the highly conserved karyotypes.
Collapse
Affiliation(s)
- Ricardo Micolino
- Programa de Pós-graduação em Genética, Universidade Federal do Paraná, Curitiba, PR, Brazil
| | - Brenda Carla Lima Baldez
- Departamento de Biodiversidade, Evolução e Meio Ambiente, Universidade Federal de Ouro Preto, Campus Morro do Cruzeiro, Ouro Preto, MG, Brazil
- Programa de Pós-gradução em Ecologia de Biomas Tropicais, Universidade Federal de Ouro Preto, Ouro Preto, MG, Brazil
| | - Andrés F Sánchez-Restrepo
- Fundación para el Estudio de Especies Invasivas (FuEDEI), Hurlingham, Buenos Aires, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
| | - Luis Calcaterra
- Fundación para el Estudio de Especies Invasivas (FuEDEI), Hurlingham, Buenos Aires, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
| | - Maykon Passos Cristiano
- Departamento de Biodiversidade, Evolução e Meio Ambiente, Universidade Federal de Ouro Preto, Campus Morro do Cruzeiro, Ouro Preto, MG, Brazil
- Programa de Pós-gradução em Ecologia de Biomas Tropicais, Universidade Federal de Ouro Preto, Ouro Preto, MG, Brazil
| | - Danon Clemes Cardoso
- Programa de Pós-graduação em Genética, Universidade Federal do Paraná, Curitiba, PR, Brazil
- Departamento de Biodiversidade, Evolução e Meio Ambiente, Universidade Federal de Ouro Preto, Campus Morro do Cruzeiro, Ouro Preto, MG, Brazil
- Programa de Pós-gradução em Ecologia de Biomas Tropicais, Universidade Federal de Ouro Preto, Ouro Preto, MG, Brazil
| |
Collapse
|
20
|
Bizarria R, Pagnocca FC, Rodrigues A. Yeasts in the attine ant-fungus mutualism: Diversity, functional roles, and putative biotechnological applications. Yeast 2021; 39:25-39. [PMID: 34473375 DOI: 10.1002/yea.3667] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Revised: 07/20/2021] [Accepted: 08/30/2021] [Indexed: 01/01/2023] Open
Abstract
Insects interact with a wide variety of yeasts, often providing a suitable substrate for their growth. Some yeast-insect interactions are tractable models for understanding the relationships between the symbionts. Attine ants are prominent insects in the Neotropics and have performed an ancient fungiculture of mutualistic basidiomycete fungi for more than 55-65 million years. Yeasts gain access to this sophisticated mutualism, prompting diversity, ecological, and biotechnological studies in this environment. We review half a century research in this field, surveying for recurrent yeast taxa and their putative ecological roles in this environment. We found that previous studies mainly covered the yeast diversity from a small fraction of attine ants, being Saccharomycetales, Tremellales, and Trichosporonales as the most frequent yeast or yeast-like orders found. Apiotrichum, Aureobasidium, Candida, Cutaneotrichosporon, Debaryomyces, Meyerozyma, Papiliotrema, Rhodotorula, Trichomonascus, and Trichosporon are the most frequent recovered genera. On the other hand, studies of yeasts' ecological roles on attine ant-fungus mutualism only tapped the tip of the iceberg. Previous established hypotheses in the literature cover the production of lignocellulosic enzymes, chemical detoxification, and fungus garden protection. Some of these roles have parallels in biotechnological processes. In conclusion, the attine ant environment has a hidden potential for studying yeast biodiversity, ecology, and biotechnology, which has been particularly unexplored considering the vast diversity of fungus-growing ants.
Collapse
Affiliation(s)
- Rodolfo Bizarria
- Center for the Study of Social Insects, São Paulo State University (UNESP), Rio Claro, Brazil.,Department of General and Applied Biology, São Paulo State University (UNESP), Rio Claro, Brazil
| | | | - Andre Rodrigues
- Center for the Study of Social Insects, São Paulo State University (UNESP), Rio Claro, Brazil.,Department of General and Applied Biology, São Paulo State University (UNESP), Rio Claro, Brazil
| |
Collapse
|
21
|
Caraballo-Rodríguez AM, Puckett SP, Kyle KE, Petras D, da Silva R, Nothias LF, Ernst M, van der Hooft JJJ, Tripathi A, Wang M, Balunas MJ, Klassen JL, Dorrestein PC. Chemical Gradients of Plant Substrates in an Atta texana Fungus Garden. mSystems 2021; 6:e0060121. [PMID: 34342533 PMCID: PMC8409729 DOI: 10.1128/msystems.00601-21] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Accepted: 07/02/2021] [Indexed: 11/21/2022] Open
Abstract
Many ant species grow fungus gardens that predigest food as an essential step of the ants' nutrient uptake. These symbiotic fungus gardens have long been studied and feature a gradient of increasing substrate degradation from top to bottom. To further facilitate the study of fungus gardens and enable the understanding of the predigestion process in more detail than currently known, we applied recent mass spectrometry-based approaches and generated a three-dimensional (3D) molecular map of an Atta texana fungus garden to reveal chemical modifications as plant substrates pass through it. The metabolomics approach presented in this study can be applied to study similar processes in natural environments to compare with lab-maintained ecosystems. IMPORTANCE The study of complex ecosystems requires an understanding of the chemical processes involving molecules from several sources. Some of the molecules present in fungus-growing ants' symbiotic system originate from plants. To facilitate the study of fungus gardens from a chemical perspective, we provide a molecular map of an Atta texana fungus garden to reveal chemical modifications as plant substrates pass through it. The metabolomics approach presented in this study can be applied to study similar processes in natural environments.
Collapse
Affiliation(s)
- Andrés Mauricio Caraballo-Rodríguez
- Collaborative Mass Spectrometry Innovation Center, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, California, USA
| | - Sara P. Puckett
- Division of Medicinal Chemistry, Department of Pharmaceutical Sciences, University of Connecticut, Storrs, Connecticut, USA
| | - Kathleen E. Kyle
- Department of Molecular and Cell Biology, University of Connecticut, Storrs, Connecticut, USA
| | - Daniel Petras
- Collaborative Mass Spectrometry Innovation Center, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, California, USA
- Scripps Institution of Oceanography, University of California San Diego, La Jolla, California, USA
- CMFI Cluster of Excellence, Interfaculty Institute of Microbiology and Medicine, University of Tuebingen, Tuebingen, Germany
| | - Ricardo da Silva
- School of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - Louis-Félix Nothias
- Collaborative Mass Spectrometry Innovation Center, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, California, USA
| | - Madeleine Ernst
- Section for Clinical Mass Spectrometry, Danish Center for Neonatal Screening, Department of Congenital Disorders, Statens Serum Institut, Copenhagen, Denmark
| | | | - Anupriya Tripathi
- Collaborative Mass Spectrometry Innovation Center, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, California, USA
- Division of Biological Sciences, University of California San Diego, La Jolla, California, USA
- Department of Pediatrics, University of California San Diego, La Jolla, California, USA
| | - Mingxun Wang
- Collaborative Mass Spectrometry Innovation Center, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, California, USA
| | - Marcy J. Balunas
- Division of Medicinal Chemistry, Department of Pharmaceutical Sciences, University of Connecticut, Storrs, Connecticut, USA
| | - Jonathan L. Klassen
- Department of Molecular and Cell Biology, University of Connecticut, Storrs, Connecticut, USA
| | - Pieter C. Dorrestein
- Collaborative Mass Spectrometry Innovation Center, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, California, USA
| |
Collapse
|
22
|
Beigel K, Matthews AE, Kellner K, Pawlik CV, Greenwold M, Seal JN. Cophylogenetic analyses of Trachymyrmex ant-fungal specificity: "One to one with some exceptions". Mol Ecol 2021; 30:5605-5620. [PMID: 34424571 DOI: 10.1111/mec.16140] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Revised: 08/05/2021] [Accepted: 08/11/2021] [Indexed: 01/18/2023]
Abstract
Over the past few decades, large-scale phylogenetic analyses of fungus-gardening ants and their symbiotic fungi have depicted strong concordance among major clades of ants and their symbiotic fungi, yet within clades, fungus sharing is widespread among unrelated ant lineages. Sharing has been explained using a diffuse coevolution model within major clades. Understanding horizontal exchange within clades has been limited by conventional genetic markers that lack both interspecific and geographic variation. To examine whether reports of horizontal exchange were indeed due to symbiont sharing or the result of employing relatively uninformative molecular markers, samples of Trachymyrmex arizonensis and Trachymyrmex pomonae and their fungi were collected from native populations in Arizona and genotyped using conventional marker genes and genome-wide single nucleotide polymorphisms (SNPs). Conventional markers of the fungal symbionts generally exhibited cophylogenetic patterns that were consistent with some symbiont sharing, but most fungal clades had low support. SNP analysis, in contrast, indicated that each ant species exhibited fidelity to its own fungal subclade with only one instance of a colony growing a fungus that was otherwise associated with a different ant species. This evidence supports a pattern of codivergence between Trachymyrmex species and their fungi, and thus a diffuse coevolutionary model may not accurately predict symbiont exchange. These results suggest that fungal sharing across host species in these symbioses may be less extensive than previously thought.
Collapse
Affiliation(s)
- Katherine Beigel
- Department of Biology, The University of Texas at Tyler, Tyler, Texas, USA
| | - Alix E Matthews
- Department of Biology, The University of Texas at Tyler, Tyler, Texas, USA.,College of Sciences and Mathematics and Molecular Biosciences Program, Arkansas State University, Jonesboro, Arkansas, USA
| | - Katrin Kellner
- Department of Biology, The University of Texas at Tyler, Tyler, Texas, USA
| | - Christine V Pawlik
- Department of Biology, The University of Texas at Tyler, Tyler, Texas, USA
| | - Matthew Greenwold
- Department of Biology, The University of Texas at Tyler, Tyler, Texas, USA
| | - Jon N Seal
- Department of Biology, The University of Texas at Tyler, Tyler, Texas, USA
| |
Collapse
|
23
|
Burkholderia from Fungus Gardens of Fungus-Growing Ants Produces Antifungals That Inhibit the Specialized Parasite Escovopsis. Appl Environ Microbiol 2021; 87:e0017821. [PMID: 33962985 DOI: 10.1128/aem.00178-21] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Within animal-associated microbiomes, the functional roles of specific microbial taxa are often uncharacterized. Here, we use the fungus-growing ant system, a model for microbial symbiosis, to determine the potential defensive roles of key bacterial taxa present in the ants' fungus gardens. Fungus gardens serve as an external digestive system for the ants, with mutualistic fungi in the genus Leucoagaricus converting the plant substrate into energy for the ants. The fungus garden is host to specialized parasitic fungi in the genus Escovopsis. Here, we examine the potential role of Burkholderia spp. that occur within ant fungus gardens in inhibiting Escovopsis. We isolated members of the bacterial genera Burkholderia and Paraburkholderia from 50% of the 52 colonies sampled, indicating that members of the family Burkholderiaceae are common inhabitants in the fungus gardens of a diverse range of fungus-growing ant genera. Using antimicrobial inhibition bioassays, we found that 28 out of 32 isolates inhibited at least one Escovopsis strain with a zone of inhibition greater than 1 cm. Genomic assessment of fungus garden-associated Burkholderiaceae indicated that isolates with strong inhibition all belonged to the genus Burkholderia and contained biosynthetic gene clusters that encoded the production of two antifungals: burkholdine1213 and pyrrolnitrin. Organic extracts of cultured isolates confirmed that these compounds are responsible for antifungal activities that inhibit Escovopsis but, at equivalent concentrations, not Leucoagaricus spp. Overall, these new findings, combined with previous evidence, suggest that members of the fungus garden microbiome play an important role in maintaining the health and function of fungus-growing ant colonies. IMPORTANCE Many organisms partner with microbes to defend themselves against parasites and pathogens. Fungus-growing ants must protect Leucoagaricus spp., the fungal mutualist that provides sustenance for the ants, from a specialized fungal parasite, Escovopsis. The ants take multiple approaches, including weeding their fungus gardens to remove Escovopsis spores, as well as harboring Pseudonocardia spp., bacteria that produce antifungals that inhibit Escovopsis. In addition, a genus of bacteria commonly found in fungus gardens, Burkholderia, is known to produce secondary metabolites that inhibit Escovopsis spp. In this study, we isolated Burkholderia spp. from fungus-growing ants, assessed the isolates' ability to inhibit Escovopsis spp., and identified two compounds responsible for inhibition. Our findings suggest that Burkholderia spp. are often found in fungus gardens, adding another possible mechanism within the fungus-growing ant system to suppress the growth of the specialized parasite Escovopsis.
Collapse
|
24
|
Cardenas CR, Luo AR, Jones TH, Schultz TR, Adams RM. Using an integrative taxonomic approach to delimit a sibling species, Mycetomoellerius mikromelanos sp. nov. (Formicidae: Attini: Attina). PeerJ 2021; 9:e11622. [PMID: 34221725 PMCID: PMC8236233 DOI: 10.7717/peerj.11622] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Accepted: 05/26/2021] [Indexed: 11/24/2022] Open
Abstract
The fungus-growing ant Mycetomoellerius (previously Trachymyrmex) zeteki (Weber 1940) has been the focus of a wide range of studies examining symbiotic partners, garden pathogens, mating frequencies, and genomics. This is in part due to the ease of collecting colonies from creek embankments and its high abundance in the Panama Canal region. The original description was based on samples collected on Barro Colorado Island (BCI), Panama. However, most subsequent studies have sampled populations on the mainland 15 km southeast of BCI. Herein we show that two sibling ant species live in sympatry on the mainland: Mycetomoellerius mikromelanos Cardenas, Schultz, & Adams and M. zeteki. This distinction was originally based on behavioral differences of workers in the field and on queen morphology (M. mikromelanos workers and queens are smaller and black while those of M. zeteki are larger and red). Authors frequently refer to either species as "M. cf. zeteki," indicating uncertainty about identity. We used an integrative taxonomic approach to resolve this, examining worker behavior, chemical profiles of worker volatiles, molecular markers, and morphology of all castes. For the latter, we used conventional taxonomic indicators from nine measurements, six extrapolated indices, and morphological characters. We document a new observation of a Diapriinae (Hymenoptera: Diapriidae) parasitoid wasp parasitizing M. zeteki. Finally, we discuss the importance of vouchering in dependable, accessible museum collections and provide a table of previously published papers to clarify the usage of the name T. zeteki. We found that most reports of M. zeteki or M. cf. zeteki-including a genome-actually refer to the new species M. mikromelanos.
Collapse
Affiliation(s)
- Cody Raul Cardenas
- Department of Evolution, Ecology and Organismal Biology, The Ohio State University, Columbus, OH, United States of America
| | - Amy Rongyan Luo
- Department of Ecology & Evolutionary Biology, University of Tennessee Knoxville, Knoxville, TN, United States of America
| | - Tappey H. Jones
- Department of Chemistry, Virginia Military Institute, Lexington, VA, United States of America
| | - Ted R. Schultz
- Department of Entomology, National Museum of Natural History, Smithsonian Institution, Washington, District of Colombia, United States of America
| | - Rachelle M.M. Adams
- Department of Evolution, Ecology and Organismal Biology, The Ohio State University, Columbus, OH, United States of America
- Department of Entomology, National Museum of Natural History, Smithsonian Institution, Washington, District of Colombia, United States of America
| |
Collapse
|
25
|
Matthews AE, Kellner K, Seal JN. Male-biased dispersal in a fungus-gardening ant symbiosis. Ecol Evol 2021; 11:2307-2320. [PMID: 33717457 PMCID: PMC7920773 DOI: 10.1002/ece3.7198] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2020] [Revised: 12/08/2020] [Accepted: 12/11/2020] [Indexed: 02/06/2023] Open
Abstract
For nearly all organisms, dispersal is a fundamental life-history trait that can shape their ecology and evolution. Variation in dispersal capabilities within a species exists and can influence population genetic structure and ecological interactions. In fungus-gardening (attine) ants, co-dispersal of ants and mutualistic fungi is crucial to the success of this obligate symbiosis. Female-biased dispersal (and gene flow) may be favored in attines because virgin queens carry the responsibility of dispersing the fungi, but a paucity of research has made this conclusion difficult. Here, we investigate dispersal of the fungus-gardening ant Trachymyrmex septentrionalis using a combination of maternally (mitochondrial DNA) and biparentally inherited (microsatellites) markers. We found three distinct, spatially isolated mitochondrial DNA haplotypes; two were found in the Florida panhandle and the other in the Florida peninsula. In contrast, biparental markers illustrated significant gene flow across this region and minimal spatial structure. The differential patterns uncovered from mitochondrial DNA and microsatellite markers suggest that most long-distance ant dispersal is male-biased and that females (and concomitantly the fungus) have more limited dispersal capabilities. Consequently, the limited female dispersal is likely an important bottleneck for the fungal symbiont. This bottleneck could slow fungal genetic diversification, which has significant implications for both ant hosts and fungal symbionts regarding population genetics, species distributions, adaptive responses to environmental change, and coevolutionary patterns.
Collapse
Affiliation(s)
- Alix E. Matthews
- Department of BiologyThe University of Texas at TylerTylerTXUSA
- Present address:
College of Sciences and Mathematics and Molecular Biosciences ProgramArkansas State UniversityJonesboroARUSA
| | - Katrin Kellner
- Department of BiologyThe University of Texas at TylerTylerTXUSA
| | - Jon N. Seal
- Department of BiologyThe University of Texas at TylerTylerTXUSA
| |
Collapse
|
26
|
Fukuda TH, Helfrich EJN, Mevers E, Melo WGP, Van Arnam EB, Andes DR, Currie CR, Pupo MT, Clardy J. Specialized Metabolites Reveal Evolutionary History and Geographic Dispersion of a Multilateral Symbiosis. ACS CENTRAL SCIENCE 2021; 7:292-299. [PMID: 33655067 PMCID: PMC7908033 DOI: 10.1021/acscentsci.0c00978] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Indexed: 05/29/2023]
Abstract
Fungus-growing ants engage in a multilateral symbiosis: they cultivate a fungal garden as their primary food source and host symbiotic actinobacteria (Pseudonocardia spp.) that provide chemical defenses. The bacterial symbionts produce small specialized metabolites that protect the fungal garden from specific fungal pathogens (Escovopsis spp.), and in return, they are fed by the ant hosts. Multiple studies on the molecules underlying this symbiotic system have led to the discovery of a large number of structurally diverse antifungal molecules, but somewhat surprisingly no shared structural theme emerged from these studies. A large systematic study of Brazilian nests led to the discovery of the widespread production of a potent but overlooked antifungal agent, which we named attinimicin, by nearly two-thirds of all Pseudonocardia strains from multiple sites in Brazil. Here we report the structure of attinimicin, its putative biosynthetic gene cluster, and the evolutionary relationship between attinimicin and two related peptides, oxachelin A and cahuitamycin A. All three nonribosomal peptides are structural isomers with different primary peptide sequences. Attinimicin shows iron-dependent antifungal activity against specific environmental fungal parasites but no activity against the fungal cultivar. Attinimicin showed potent in vivo activity in a mouse Candida albicans infection model comparable to clinically used azole-containing antifungals. In situ detection of attinimicin in both ant nests and on worker ants supports an ecological role for attinimicin in protecting the fungal cultivar from pathogens. The geographic spread of the attinimicin biosynthetic gene cluster in Brazilian Pseudonocardia spp. marks attinimicin as the first specialized metabolite from ant-associated bacteria with broad geographic distribution.
Collapse
Affiliation(s)
- Taise
T. H. Fukuda
- Department
of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115, United States
- School
of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo 14040-903, Brazil
| | - Eric J. N. Helfrich
- Department
of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115, United States
- Institute
for Molecular Bio Science, Goethe University
Frankfurt, 60438 Frankfurt am Main, Germany
- LOEWE
Center for Translational Biodiversity Genomics (TBG), 60325 Frankfurt
am Main, Germany
| | - Emily Mevers
- Department
of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115, United States
- Department
of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Weilan G. P. Melo
- School
of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo 14040-903, Brazil
| | - Ethan B. Van Arnam
- Department
of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115, United States
- Keck
Science
Department, Claremont McKenna, Pitzer, and
Scripps Colleges, Claremont, California 91711, United States
| | - David R. Andes
- Department
of Medicine, University of Wisconsin School
of Medicine and Public Health, Madison, Wisconsin 53705, United States
| | - Cameron R. Currie
- Department
of Bacteriology, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Monica T. Pupo
- School
of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo 14040-903, Brazil
| | - Jon Clardy
- Department
of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115, United States
| |
Collapse
|
27
|
Schiøtt M, Boomsma JJ. Proteomics reveals synergy between biomass degrading enzymes and inorganic Fenton chemistry in leaf-cutting ant colonies. eLife 2021; 10:e61816. [PMID: 33433325 PMCID: PMC7877906 DOI: 10.7554/elife.61816] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Accepted: 01/09/2021] [Indexed: 02/07/2023] Open
Abstract
The symbiotic partnership between leaf-cutting ants and fungal cultivars processes plant biomass via ant fecal fluid mixed with chewed plant substrate before fungal degradation. Here we present a full proteome of the fecal fluid of Acromyrmex leaf-cutting ants, showing that most proteins function as biomass degrading enzymes and that ca. 85% are produced by the fungus and ingested, but not digested, by the ants. Hydrogen peroxide producing oxidoreductases were remarkably common in the proteome, inspiring us to test a scenario in which hydrogen peroxide reacts with iron to form reactive oxygen radicals after which oxidized iron is reduced by other fecal-fluid enzymes. Our biochemical assays confirmed that these so-called Fenton reactions do indeed take place in special substrate pellets, presumably to degrade plant cell wall polymers. This implies that the symbiotic partnership manages a combination of oxidative and enzymatic biomass degradation, an achievement that surpasses current human bioconversion technology.
Collapse
Affiliation(s)
- Morten Schiøtt
- Centre for Social Evolution, Department of Biology, University of Copenhagen, UniversitetsparkenCopenhagenDenmark
| | - Jacobus J Boomsma
- Centre for Social Evolution, Department of Biology, University of Copenhagen, UniversitetsparkenCopenhagenDenmark
| |
Collapse
|
28
|
Li H, Young SE, Poulsen M, Currie CR. Symbiont-Mediated Digestion of Plant Biomass in Fungus-Farming Insects. ANNUAL REVIEW OF ENTOMOLOGY 2021; 66:297-316. [PMID: 32926791 DOI: 10.1146/annurev-ento-040920-061140] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Feeding on living or dead plant material is widespread in insects. Seminal work on termites and aphids has provided profound insights into the critical nutritional role that microbes play in plant-feeding insects. Some ants, beetles, and termites, among others, have evolved the ability to use microbes to gain indirect access to plant substrate through the farming of a fungus on which they feed. Recent genomic studies, including studies of insect hosts and fungal and bacterial symbionts, as well as metagenomics and proteomics, have provided important insights into plant biomass digestion across insect-fungal mutualisms. Not only do advances in understanding of the divergent and complementary functions of complex symbionts reveal the mechanism of how these herbivorous insects catabolize plant biomass, but these symbionts also represent a promising reservoir for novel carbohydrate-active enzyme discovery, which is of considerable biotechnological interest.
Collapse
Affiliation(s)
- Hongjie Li
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Key Laboratory of Biotechnology in Plant Protection of Ministry of Agriculture and Zhejiang Province, Institute of Plant Virology, Ningbo University, Ningbo 315211, China;
- Department of Bacteriology, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA; ,
- Department of Energy Great Lakes Bioenergy Research Center, Wisconsin Energy Institute, University of Wisconsin-Madison, Madison, Wisconsin 53726, USA
| | - Soleil E Young
- Department of Bacteriology, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA; ,
| | - Michael Poulsen
- Section for Ecology and Evolution, Department of Biology, University of Copenhagen, 2100 Copenhagen East, Denmark;
| | - Cameron R Currie
- Department of Bacteriology, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA; ,
- Department of Energy Great Lakes Bioenergy Research Center, Wisconsin Energy Institute, University of Wisconsin-Madison, Madison, Wisconsin 53726, USA
| |
Collapse
|
29
|
Domestication via the commensal pathway in a fish-invertebrate mutualism. Nat Commun 2020; 11:6253. [PMID: 33288750 PMCID: PMC7721709 DOI: 10.1038/s41467-020-19958-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Accepted: 11/06/2020] [Indexed: 01/04/2023] Open
Abstract
Domesticator-domesticate relationships are specialized mutualisms where one species provides multigenerational support to another in exchange for a resource or service, and through which both partners gain an advantage over individuals outside the relationship. While this ecological innovation has profoundly reshaped the world’s landscapes and biodiversity, the ecological circumstances that facilitate domestication remain uncertain. Here, we show that longfin damselfish (Stegastes diencaeus) aggressively defend algae farms on which they feed, and this protective refuge selects a domesticator-domesticate relationship with planktonic mysid shrimps (Mysidium integrum). Mysids passively excrete nutrients onto farms, which is associated with enriched algal composition, and damselfish that host mysids exhibit better body condition compared to those without. Our results suggest that the refuge damselfish create as a byproduct of algal tending and the mutual habituation that damselfish and mysids exhibit towards one another were instrumental in subsequent mysid domestication. These results are consistent with domestication via the commensal pathway, by which many common examples of animal domestication are hypothesized to have evolved. It has been hypothesized that domestication can occur through the ‘commensal pathway’ in which the domesticate takes advantage of a niche created as a byproduct by the domesticator. Here, Brooker et al. provide evidence for a commensal domestication process between longfin damselfish and mysid shrimps.
Collapse
|
30
|
Comprehensive phylogeny of Myrmecocystus honey ants highlights cryptic diversity and infers evolution during aridification of the American Southwest. Mol Phylogenet Evol 2020; 155:107036. [PMID: 33278587 DOI: 10.1016/j.ympev.2020.107036] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2020] [Revised: 10/06/2020] [Accepted: 11/30/2020] [Indexed: 11/22/2022]
Abstract
The New World ant genus Myrmecocystus Wesmael, 1838 (Formicidae: Formicinae: Lasiini) is endemic to arid and semi-arid habitats of the western United States and Mexico. Several intriguing life history traits have been described for the genus, the best-known of which are replete workers, that store liquified food in their largely expanded crops and are colloquially referred to as "honeypots". Despite their interesting biology and ecological importance for arid ecosystems, the evolutionary history of Myrmecocystus ants is largely unknown and the current taxonomy presents an unsatisfactory systematic framework. We use ultraconserved elements to infer the evolutionary history of Myrmecocystus ants and provide a comprehensive, dated phylogenetic framework that clarifies the molecular systematics within the genus with high statistical support, reveals cryptic diversity, and reconstructs ancestral foraging activity. Using maximum likelihood, Bayesian and species tree approaches on a data set of 134 ingroup specimens (including samples from natural history collections and type material), we recover largely identical topologies that leave the position of only few clades uncertain and cover the intra- and interspecific variation of 28 of the 29 described and six undescribed species. In addition to traditional support values, such as bootstrap and posterior probability, we quantify genealogical concordance to estimate the effects of conflicting evolutionary histories on phylogenetic inference. Our analyses reveal that the current taxonomic classification of the genus is inconsistent with the molecular phylogenetic inference, and we identify cryptic diversity in seven species. Divergence dating suggests that the split between Myrmecocystus and its sister taxon Lasius occurred in the early Miocene. Crown group Myrmecocystus started diversifying about 14.08 Ma ago when the gradual aridification of the southwestern United States and northern Mexico led to formation of the American deserts and to adaptive radiations of many desert taxa.
Collapse
|
31
|
Shik JZ, Kooij PW, Donoso DA, Santos JC, Gomez EB, Franco M, Crumière AJJ, Arnan X, Howe J, Wcislo WT, Boomsma JJ. Nutritional niches reveal fundamental domestication trade-offs in fungus-farming ants. Nat Ecol Evol 2020; 5:122-134. [PMID: 33106603 PMCID: PMC7610523 DOI: 10.1038/s41559-020-01314-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2020] [Accepted: 08/25/2020] [Indexed: 02/06/2023]
Abstract
During crop domestication, human farmers traded greater productivity for higher crop vulnerability outside specialized cultivation conditions. We found a similar domestication tradeoff across the major co-evolutionary transitions in farming systems of attine ants. First, the fundamental nutritional niches (FNNs) of cultivars narrowed during ~ 60 million years of naturally selected domestication, and laboratory experiments showed that ant farmers representing subsequent domestication stages strictly regulate protein harvest relative to cultivar FNNs. Second, ants with different farming systems differed in their abilities to harvest the resources that best matched the nutritional needs of their fungal cultivars. This was assessed by quantifying realized nutritional niches (RNNs) from analyses of items collected from the mandibles of laden ant foragers in the field. Third, extensive field collections suggest that among-colony genetic diversity of cultivars in small-scale farms may offer population-wide resilience benefits that species with large-scale farming colonies achieve by more elaborate and demanding cultivation practices of less diverse crops. Our results underscore that naturally selected farming systems have potential to shed light on nutritional tradeoffs that shaped the course of culturally evolved human farming.
Collapse
Affiliation(s)
- Jonathan Z Shik
- Section of Ecology and Evolution, Department of Biology, University of Copenhagen, Copenhagen, Denmark. .,Centre for Social Evolution, Department of Biology, University of Copenhagen, Copenhagen, Denmark. .,Smithsonian Tropical Research Institute, Panama City, Republic of Panama.
| | - Pepijn W Kooij
- Centre for Social Evolution, Department of Biology, University of Copenhagen, Copenhagen, Denmark.,Comparative Fungal Biology, Department of Comparative Plant and Fungal Biology, Royal Botanic Gardens, Kew, London, UK.,Center for the Study of Social Insects, São Paulo State University (UNESP), Rio Claro, Brazil
| | - David A Donoso
- Departamento de Biología, Escuela Politécnica Nacional, Quito, Ecuador.,Centro de Investigación de la Biodiversidad y Cambio Climático, Universidad Tecnológica Indoamérica, Quito, Ecuador
| | - Juan C Santos
- Department of Biological Sciences, St. John's University, New York, NY, USA
| | - Ernesto B Gomez
- Smithsonian Tropical Research Institute, Panama City, Republic of Panama
| | - Mariana Franco
- Smithsonian Tropical Research Institute, Panama City, Republic of Panama
| | - Antonin J J Crumière
- Section of Ecology and Evolution, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Xavier Arnan
- Centre de Recerca Ecològica i Aplicacions Forestals (CREAF), Cerdanyola del Vallès, Spain.,Department of Biological Sciences, University of Pernambuco, Garanhuns, Brazil
| | - Jack Howe
- Centre for Social Evolution, Department of Biology, University of Copenhagen, Copenhagen, Denmark.,Department of Zoology, University of Oxford, Oxford, UK
| | - William T Wcislo
- Smithsonian Tropical Research Institute, Panama City, Republic of Panama
| | - Jacobus J Boomsma
- Section of Ecology and Evolution, Department of Biology, University of Copenhagen, Copenhagen, Denmark.,Centre for Social Evolution, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| |
Collapse
|
32
|
Abstract
Humans have been domesticating plants, animals and microbes for centuries. But are we alone in doing so? Brooker and Feeney explain how domestication by animals of other species goes back even farther.
Collapse
Affiliation(s)
- Rohan M Brooker
- Centre for Integrated Ecology, School of Life and Environmental Sciences, Deakin University, Geelong, Australia.
| | - William E Feeney
- Environmental Futures Research Institute, School of Environment and Science, Griffith University, Australia
| |
Collapse
|
33
|
Menezes RST, Lloyd MW, Brady SG. Phylogenomics indicates Amazonia as the major source of Neotropical swarm-founding social wasp diversity. Proc Biol Sci 2020; 287:20200480. [PMID: 32486978 DOI: 10.1098/rspb.2020.0480] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
The Neotropical realm harbours unparalleled species richness and hence has challenged biologists to explain the cause of its high biotic diversity. Empirical studies to shed light on the processes underlying biological diversification in the Neotropics are focused mainly on vertebrates and plants, with little attention to the hyperdiverse insect fauna. Here, we use phylogenomic data from ultraconserved element (UCE) loci to reconstruct for the first time the evolutionary history of Neotropical swarm-founding social wasps (Hymenoptera, Vespidae, Epiponini). Using maximum likelihood, Bayesian, and species tree approaches we recovered a highly resolved phylogeny for epiponine wasps. Additionally, we estimated divergence dates, diversification rates, and the biogeographic history for these insects in order to test whether the group followed a 'museum' (speciation events occurred gradually over many millions of years) or 'cradle' (lineages evolved rapidly over a short time period) model of diversification. The origin of many genera and all sampled extant Epiponini species occurred during the Miocene and Plio-Pleistocene. Moreover, we detected no major shifts in the estimated diversification rate during the evolutionary history of Epiponini, suggesting a relatively gradual accumulation of lineages with low extinction rates. Several lines of evidence suggest that the Amazonian region played a major role in the evolution of Epiponini wasps. This spatio-temporal diversification pattern, most likely concurrent with climatic and landscape changes in the Neotropics during the Miocene and Pliocene, establishes the Amazonian region as the major source of Neotropical swarm-founding social wasp diversity.
Collapse
Affiliation(s)
- Rodolpho S T Menezes
- Department of Entomology, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560-0188, USA.,Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras - Universidade de São Paulo (FFCLRP/USP), Av. Bandeirantes, 3900, 14040-901 Ribeirão Preto, SP, Brazil
| | - Michael W Lloyd
- Department of Entomology, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560-0188, USA.,Computational Sciences, The Jackson Laboratory, 600 Main Street, Bar Harbor, ME 04609, USA
| | - Seán G Brady
- Department of Entomology, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560-0188, USA
| |
Collapse
|
34
|
Allio R, Schomaker-Bastos A, Romiguier J, Prosdocimi F, Nabholz B, Delsuc F. MitoFinder: Efficient automated large-scale extraction of mitogenomic data in target enrichment phylogenomics. Mol Ecol Resour 2020; 20:892-905. [PMID: 32243090 PMCID: PMC7497042 DOI: 10.1111/1755-0998.13160] [Citation(s) in RCA: 543] [Impact Index Per Article: 135.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Revised: 02/21/2020] [Accepted: 03/12/2020] [Indexed: 11/27/2022]
Abstract
Thanks to the development of high-throughput sequencing technologies, target enrichment sequencing of nuclear ultraconserved DNA elements (UCEs) now allows routine inference of phylogenetic relationships from thousands of genomic markers. Recently, it has been shown that mitochondrial DNA (mtDNA) is frequently sequenced alongside the targeted loci in such capture experiments. Despite its broad evolutionary interest, mtDNA is rarely assembled and used in conjunction with nuclear markers in capture-based studies. Here, we developed MitoFinder, a user-friendly bioinformatic pipeline, to efficiently assemble and annotate mitogenomic data from hundreds of UCE libraries. As a case study, we used ants (Formicidae) for which 501 UCE libraries have been sequenced whereas only 29 mitogenomes are available. We compared the efficiency of four different assemblers (IDBA-UD, MEGAHIT, MetaSPAdes, and Trinity) for assembling both UCE and mtDNA loci. Using MitoFinder, we show that metagenomic assemblers, in particular MetaSPAdes, are well suited to assemble both UCEs and mtDNA. Mitogenomic signal was successfully extracted from all 501 UCE libraries, allowing us to confirm species identification using CO1 barcoding. Moreover, our automated procedure retrieved 296 cases in which the mitochondrial genome was assembled in a single contig, thus increasing the number of available ant mitogenomes by an order of magnitude. By utilizing the power of metagenomic assemblers, MitoFinder provides an efficient tool to extract complementary mitogenomic data from UCE libraries, allowing testing for potential mitonuclear discordance. Our approach is potentially applicable to other sequence capture methods, transcriptomic data and whole genome shotgun sequencing in diverse taxa. The MitoFinder software is available from GitHub (https://github.com/RemiAllio/MitoFinder).
Collapse
Affiliation(s)
- Rémi Allio
- Institut des Sciences de l'Évolution de Montpellier (ISEM), CNRS, EPHE, IRD, Université de Montpellier, Montpellier, France
| | - Alex Schomaker-Bastos
- Laboratório Multidisciplinar para Análise de Dados (LAMPADA), Instituto de Bioquímica Médica Leopoldo de Meis, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Jonathan Romiguier
- Institut des Sciences de l'Évolution de Montpellier (ISEM), CNRS, EPHE, IRD, Université de Montpellier, Montpellier, France
| | - Francisco Prosdocimi
- Laboratório Multidisciplinar para Análise de Dados (LAMPADA), Instituto de Bioquímica Médica Leopoldo de Meis, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Benoit Nabholz
- Institut des Sciences de l'Évolution de Montpellier (ISEM), CNRS, EPHE, IRD, Université de Montpellier, Montpellier, France
| | - Frédéric Delsuc
- Institut des Sciences de l'Évolution de Montpellier (ISEM), CNRS, EPHE, IRD, Université de Montpellier, Montpellier, France
| |
Collapse
|
35
|
High diversity and multiple invasions to North America by fungi grown by the northern-most Trachymyrmex and Mycetomoellerius ant species. FUNGAL ECOL 2020. [DOI: 10.1016/j.funeco.2019.100878] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
36
|
Adams RMM, Wells RL, Yanoviak SP, Frost CJ, Fox EGP. Interspecific Eavesdropping on Ant Chemical Communication. Front Ecol Evol 2020. [DOI: 10.3389/fevo.2020.00024] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
37
|
Group formation and the evolutionary pathway to complex sociality in birds. Nat Ecol Evol 2020; 4:479-486. [PMID: 32094543 DOI: 10.1038/s41559-020-1113-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Accepted: 01/14/2020] [Indexed: 11/08/2022]
Abstract
Group-living species show a diversity of social organization, from simple mated pairs to complex communities of interdependent individuals performing specialized tasks. The advantages of living in cooperative groups are well understood, but why some species breed in small aggregations while others evolve large, complex groups with clearly divided roles is unclear. We address this problem by reconstructing the evolutionary pathways to cooperative breeding across 4,730 bird species. We show that differences in the way groups form at the origin of cooperative breeding predicts the level of group complexity that emerges. Groups that originate through the retention of offspring have a clear reproductive divide with distinct breeder and helper roles. This is associated with reproductive specialization, where breeders invest more in fecundity and less in care. In contrast, groups formed through the aggregation of unrelated adults are smaller and lack specialization. These results help explain why some species have not transitioned beyond simple groups while others have taken the pathway to increased group complexity.
Collapse
|
38
|
Fijian farming ants resolve the guns-or-butter dilemma for their crop plants. Proc Natl Acad Sci U S A 2020; 117:3357-3359. [PMID: 32019888 DOI: 10.1073/pnas.1922921117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
|
39
|
Abstract
The evolution of a mutualism requires reciprocal interactions whereby one species provides a service that the other species cannot perform or performs less efficiently. Services exchanged in insect-fungus mutualisms include nutrition, protection, and dispersal. In ectosymbioses, which are the focus of this review, fungi can be consumed by insects or can degrade plant polymers or defensive compounds, thereby making a substrate available to insects. They can also protect against environmental factors and produce compounds antagonistic to microbial competitors. Insects disperse fungi and can also provide fungal growth substrates and protection. Insect-fungus mutualisms can transition from facultative to obligate, whereby each partner is no longer viable on its own. Obligate dependency has (a) resulted in the evolution of morphological adaptations in insects and fungi, (b) driven the evolution of social behaviors in some groups of insects, and (c) led to the loss of sexuality in some fungal mutualists.
Collapse
Affiliation(s)
- Peter H W Biedermann
- Research Group Insect-Fungus Symbiosis, Department of Animal Ecology and Tropical Biology, University of Würzburg, 97074 Würzburg, Germany;
| | - Fernando E Vega
- Sustainable Perennial Crops Laboratory, United States Department of Agriculture, Agricultural Research Service, Beltsville, Maryland 20705, USA;
| |
Collapse
|
40
|
Micolino R, Cristiano MP, Travenzoli NM, Lopes DM, Cardoso DC. Chromosomal dynamics in space and time: evolutionary history of Mycetophylax ants across past climatic changes in the Brazilian Atlantic coast. Sci Rep 2019; 9:18800. [PMID: 31827151 PMCID: PMC6906305 DOI: 10.1038/s41598-019-55135-5] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Accepted: 11/01/2019] [Indexed: 12/14/2022] Open
Abstract
Fungus-farming ants of the genus Mycetophylax exhibit intra and interspecific chromosome variability, which makes them suitable for testing hypotheses about possible chromosomal rearrangements that endure lineage diversification. We combined cytogenetic and molecular data from Mycetophylax populations from coastal environments to trace the evolutionary history of the clade in light of chromosomal changes under a historical and geographic context. Our cytogenetic analyses revealed chromosomal differences within and among species. M. morschi exhibited three distinct karyotypes and considerable variability in the localization of 45S rDNA clusters. The molecular phylogeny was congruent with our cytogenetic findings. Biogeographical and divergence time dating analyses estimated that the most recent common ancestor of Mycetophylax would have originated at about 30 Ma in an area including the Amazon and Southern Grasslands, and several dispersion and vicariance events may have occurred before the colonization of the Brazilian Atlantic coast. Diversification of the psammophilous Mycetophylax first took place in the Middle Miocene (ca. 18-10 Ma) in the South Atlantic coast, while "M. morschi" lineages diversified during the Pliocene-Pleistocene transition (ca. 3-2 Ma) through founder-event dispersal for the Northern coastal regions. Psammophilous Mycetophylax diversification fits into the major global climatic events that have had a direct impact on the changes in sea level as well as deep ecological impact throughout South America. We assume therefore that putative chromosomal rearrangements correlated with increased ecological stress during the past climatic transitions could have intensified and/or accompanied the divergence of the psammophilous Mycetophylax. We further reiterate that "M. morschi" comprises a complex of at least three well-defined lineages, and we emphasize the role of this integrative approach for the identification and delimitation of evolutionary lineages.
Collapse
Affiliation(s)
- Ricardo Micolino
- Departamento de Genética, Universidade Federal do Paraná (UFPR), Curitiba, PR, Brazil
- Departamento de Biodiversidade, Evolução e Meio Ambiente, Universidade Federal de Ouro Preto (UFOP), Ouro Preto, MG, Brazil
| | - Maykon Passos Cristiano
- Departamento de Biodiversidade, Evolução e Meio Ambiente, Universidade Federal de Ouro Preto (UFOP), Ouro Preto, MG, Brazil
| | | | - Denilce Meneses Lopes
- Departamento de Biologial Geral, Universidade Federal de Viçosa (UFV), Viçosa, MG, Brazil
| | - Danon Clemes Cardoso
- Departamento de Genética, Universidade Federal do Paraná (UFPR), Curitiba, PR, Brazil.
- Departamento de Biodiversidade, Evolução e Meio Ambiente, Universidade Federal de Ouro Preto (UFOP), Ouro Preto, MG, Brazil.
| |
Collapse
|
41
|
Pringle EG. Convergence, constraint and the potential for mutualism between ants and gut microbes. Mol Ecol 2019; 28:699-702. [PMID: 30811772 DOI: 10.1111/mec.14998] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2018] [Revised: 12/15/2018] [Accepted: 12/18/2018] [Indexed: 12/11/2022]
Abstract
Ants are a hugely diverse family of eusocial insects that dominate terrestrial ecosystems all over the planet. Did mutualistic gut microbes help ants to achieve their diversity and ecological dominance? Initial studies suggested the potential for widespread convergence in ant gut bacterial communities based on dietary niche, but it now seems possible that dedicated bacterial symbionts are restricted to a minority of ant lineages (Russell et al., ). Nevertheless, as most ants are omnivores, the evidence so far has suggested a broad, positive correlation between the evolution of dietary specialization and ant investment in nutrient-provisioning gut bacteria. In this issue of Molecular Ecology, Sapountzis et al. () and Rubin et al. () examine the evolution of gut bacterial communities in two iconic ant taxa-the attine fungus farmers and the Pseudomyrmex plant bodyguards, respectively-in a comparative context. By comparing gut bacteria between ant species of differing dietary specialization within each taxon, these studies demonstrate a hint of convergence in the midst of widespread apparent constraints. These results raise numerous interesting questions about the nature of these apparent constraints and whether they are causes or consequences of varying investment by ants to mutualism with their gut microbes.
Collapse
Affiliation(s)
- Elizabeth G Pringle
- Department of Biology, Program in Ecology, Evolution, and Conservation Biology, University of Nevada, Reno, Nevada
| |
Collapse
|
42
|
Senula SF, Scavetta JT, Banta JA, Mueller UG, Seal JN, Kellner K. Potential Distribution of Six North American Higher-Attine Fungus-Farming Ant (Hymenoptera: Formicidae) Species. JOURNAL OF INSECT SCIENCE (ONLINE) 2019; 19:24. [PMID: 31854452 PMCID: PMC6921375 DOI: 10.1093/jisesa/iez118] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Indexed: 06/10/2023]
Abstract
Ants are among the most successful insects in Earth's evolutionary history. However, there is a lack of knowledge regarding range-limiting factors that may influence their distribution. The goal of this study was to describe the environmental factors (climate and soil types) that likely impact the ranges of five out of the eight most abundant Trachymyrmex species and the most abundant Mycetomoellerius species in the United States. Important environmental factors may allow us to better understand each species' evolutionary history. We generated habitat suitability maps using MaxEnt for each species and identified associated most important environmental variables. We quantified niche overlap between species and evaluated possible congruence in species distribution. In all but one model, climate variables were more important than soil variables. The distribution of M. turrifex (Wheeler, W.M., 1903) was predicted by temperature, specifically annual mean temperature (BIO1), T. arizonensis (Wheeler, W.M., 1907), T. carinatus, and T. smithi Buren, 1944 were predicted by precipitation seasonality (BIO15), T. septentrionalis (McCook, 1881) were predicted by precipitation of coldest quarter (BIO19), and T. desertorum (Wheeler, W.M., 1911) was predicted by annual flood frequency. Out of 15 possible pair-wise comparisons between each species' distributions, only one was statistically indistinguishable (T. desertorum vs T. septentrionalis). All other species distribution comparisons show significant differences between species. These models support the hypothesis that climate is a limiting factor in each species distribution and that these species have adapted to temperatures and water availability differently.
Collapse
Affiliation(s)
- Sarah F Senula
- Department of Biology, University of Texas at Tyler, Tyler, TX, USA
| | - Joseph T Scavetta
- Department of Computer Science, Rowan University, Glassboro, NJ, USA
| | - Joshua A Banta
- Department of Biology, University of Texas at Tyler, Tyler, TX, USA
| | - Ulrich G Mueller
- Section of Integrative Biology, University of Texas at Austin, Austin, TX, USA
| | - Jon N Seal
- Department of Biology, University of Texas at Tyler, Tyler, TX, USA
| | - Katrin Kellner
- Department of Biology, University of Texas at Tyler, Tyler, TX, USA
| |
Collapse
|
43
|
Pringle EG, Santos TFD, Gonçalves MS, Hawes JE, Peres CA, Baccaro FB. Arboreal ant abundance tracks primary productivity in an Amazonian whitewater river system. Ecosphere 2019. [DOI: 10.1002/ecs2.2902] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Affiliation(s)
- Elizabeth G. Pringle
- Department of Biology Program in Ecology, Evolution and Conservation Biology University of Nevada, Reno Reno Nevada USA
| | | | | | - Joseph E. Hawes
- Applied Ecology Research Group School of Life Sciences Anglia Ruskin University Cambridge UK
| | - Carlos A. Peres
- School of Environmental Sciences University of East Anglia Norwich UK
- Departamento de Sistemática e Ecologia Universidade Federal da Paraíba João Pessoa Brazil
| | | |
Collapse
|
44
|
Resisting Antimicrobial Resistance: Lessons from Fungus Farming Ants. Trends Ecol Evol 2019; 34:974-976. [PMID: 31564381 DOI: 10.1016/j.tree.2019.08.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Revised: 08/09/2019] [Accepted: 08/13/2019] [Indexed: 12/29/2022]
Abstract
Attine ants use antimicrobials produced by commensal bacteria to inhibit parasites on their fungal gardens. However, in this agricultural system, antimicrobial use does not lead to overwhelming resistance, as is typical in clinical settings. Mixtures of continually evolving antimicrobial variants could support these dynamics.
Collapse
|
45
|
Derkarabetian S, Benavides LR, Giribet G. Sequence capture phylogenomics of historical ethanol‐preserved museum specimens: Unlocking the rest of the vault. Mol Ecol Resour 2019; 19:1531-1544. [DOI: 10.1111/1755-0998.13072] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Revised: 07/22/2019] [Accepted: 07/31/2019] [Indexed: 11/28/2022]
Affiliation(s)
- Shahan Derkarabetian
- Museum of Comparative Zoology Department of Organismic and Evolutionary Biology Harvard University Cambridge MA USA
| | - Ligia R. Benavides
- Museum of Comparative Zoology Department of Organismic and Evolutionary Biology Harvard University Cambridge MA USA
| | - Gonzalo Giribet
- Museum of Comparative Zoology Department of Organismic and Evolutionary Biology Harvard University Cambridge MA USA
| |
Collapse
|
46
|
Patterns of coevolution between ambrosia beetle mycangia and the Ceratocystidaceae, with five new fungal genera and seven new species. Persoonia - Molecular Phylogeny and Evolution of Fungi 2019; 44:41-66. [PMID: 33116335 PMCID: PMC7567963 DOI: 10.3767/persoonia.2020.44.02] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Accepted: 03/04/2019] [Indexed: 11/30/2022]
Abstract
Ambrosia beetles farm specialised fungi in sapwood tunnels and use pocket-like organs called mycangia to carry propagules of the fungal cultivars. Ambrosia fungi selectively grow in mycangia, which is central to the symbiosis, but the history of coevolution between fungal cultivars and mycangia is poorly understood. The fungal family Ceratocystidaceae previously included three ambrosial genera (Ambrosiella, Meredithiella, and Phialophoropsis), each farmed by one of three distantly related tribes of ambrosia beetles with unique and relatively large mycangium types. Studies on the phylogenetic relationships and evolutionary histories of these three genera were expanded with the previously unstudied ambrosia fungi associated with a fourth mycangium type, that of the tribe Scolytoplatypodini. Using ITS rDNA barcoding and a concatenated dataset of six loci (28S rDNA, 18S rDNA, tef1-α, tub, mcm7, and rpl1), a comprehensive phylogeny of the family Ceratocystidaceae was developed, including Inodoromyces interjectus gen. & sp. nov., a non-ambrosial species that is closely related to the family. Three minor morphological variants of the pronotal disk mycangium of the Scolytoplatypodini were associated with ambrosia fungi in three respective clades of Ceratocystidaceae: Wolfgangiella gen. nov., Toshionella gen. nov., and Ambrosiella remansi sp. nov. Closely-related species that are not symbionts of ambrosia beetles are accommodated by Catunica adiposa gen. & comb. nov. and Solaloca norvegica gen. & comb. nov. The divergent morphology of the ambrosial genera and their phylogenetic placement among non-ambrosial genera suggest three domestication events in the Ceratocystidaceae. Estimated divergence dates for the ambrosia fungi and mycangia suggest that Scolytoplatypodini mycangia may have been the first to acquire Ceratocystidaceae symbionts and other ambrosial fungal genera emerged shortly after the evolution of new mycangium types. There is no evidence of reversion to a non-ambrosial lifestyle in the mycangial symbionts.
Collapse
|
47
|
Cruaud A, Nidelet S, Arnal P, Weber A, Fusu L, Gumovsky A, Huber J, Polaszek A, Rasplus JY. Optimized DNA extraction and library preparation for minute arthropods: Application to target enrichment in chalcid wasps used for biocontrol. Mol Ecol Resour 2019; 19:702-710. [PMID: 30758892 DOI: 10.1111/1755-0998.13006] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Revised: 01/18/2019] [Accepted: 02/01/2019] [Indexed: 01/04/2023]
Abstract
Target enrichment is increasingly used for genotyping of plant and animal species or to better understand the evolutionary history of important lineages through the inference of statistically robust phylogenies. Limitations to routine target enrichment are both the complexity of current protocols and low input DNA quantity. Thus, working with tiny organisms such as microarthropods can be challenging. Here, we propose easy to set up optimizations for DNA extraction and library preparation prior to target enrichment. Prepared libraries were used to capture 1,432 ultraconserved elements (UCEs) from microhymenoptera (Chalcidoidea), which are among the tiniest insects on Earth and the most commercialized worldwide for biological control purposes. Results show no correlation between input DNA quantities (1.8-250 ng, 0.4 ng with an extra whole genome amplification step) and the number of sequenced UCEs on an Illumina MiSeq. Phylogenetic inferences highlight the potential of UCEs to solve relationships within the families of chalcid wasps, which has not been achieved so far. The protocol (library preparation + target enrichment) allows processing 96 specimens in five working days, by a single person, without requiring the use of expensive robotic molecular biology platforms, which could help to generalize the use of target enrichment for minute specimens.
Collapse
Affiliation(s)
- Astrid Cruaud
- CBGP, INRA, CIRAD, IRD, Montpellier SupAgro, University of Montpellier, Montpellier, France
| | - Sabine Nidelet
- CBGP, INRA, CIRAD, IRD, Montpellier SupAgro, University of Montpellier, Montpellier, France
| | - Pierre Arnal
- CBGP, INRA, CIRAD, IRD, Montpellier SupAgro, University of Montpellier, Montpellier, France.,ISYEB-UMR 7205 MNHN, CNRS, UPMC, EPHE, Sorbonne Universités, Paris, France
| | - Audrey Weber
- AGAP, INRA, CIRAD, Montpellier SupAgro, University of Montpellier, Montpellier, France
| | - Lucian Fusu
- Faculty of Biology, Alexandru Ioan Cuza University, Iasi, Romania
| | - Alex Gumovsky
- Schmalhausen Institute of Zoology, National Academy of Sciences of Ukraine, Kiev, Ukraine
| | - John Huber
- Natural Resources Canada, c/o Canadian National Collection of Insects, Ottawa, Canada
| | - Andrew Polaszek
- Department of Life Sciences, Natural History Museum, London, UK
| | - Jean-Yves Rasplus
- CBGP, INRA, CIRAD, IRD, Montpellier SupAgro, University of Montpellier, Montpellier, France
| |
Collapse
|
48
|
Wright AM. A Systematist's Guide to Estimating Bayesian Phylogenies From Morphological Data. INSECT SYSTEMATICS AND DIVERSITY 2019; 3:2. [PMID: 31355348 PMCID: PMC6643758 DOI: 10.1093/isd/ixz006] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2019] [Indexed: 05/07/2023]
Abstract
Phylogenetic trees are crucial to many aspects of taxonomic and comparative biology. Many researchers have adopted Bayesian methods to estimate their phylogenetic trees. In this family of methods, a model of morphological evolution is assumed to have generated the data observed by the researcher. These models make a variety of assumptions about the evolution of morphological characters, and these assumptions are translated into mathematics as parameters. The incorporation of prior distributions further allows researchers to quantify their prior beliefs about the value any one parameter can take. How to translate biological knowledge into mathematical language is difficult, and can be confusing to many biologists. This review aims to help systematics researchers understand the biological meaning of common models and assumptions. Using examples from the insect fossil record, I will demonstrate empirically what assumptions mean in concrete terms, and discuss how researchers can use and understand Bayesian methods for phylogenetic estimation.
Collapse
Affiliation(s)
- April M Wright
- Department of Biological Sciences, Southeastern Louisiana University, Hammond, LA
| |
Collapse
|
49
|
Swanson AC, Schwendenmann L, Allen MF, Aronson EL, Artavia‐León A, Dierick D, Fernandez‐Bou AS, Harmon TC, Murillo‐Cruz C, Oberbauer SF, Pinto‐Tomás AA, Rundel PW, Zelikova TJ. Welcome to the
Atta
world: A framework for understanding the effects of leaf‐cutter ants on ecosystem functions. Funct Ecol 2019. [DOI: 10.1111/1365-2435.13319] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Amanda C. Swanson
- Department of Microbiology and Plant Pathology, Center for Conservation Biology University of California Riverside Riverside California
| | | | - Michael F. Allen
- Department of Microbiology and Plant Pathology, Center for Conservation Biology University of California Riverside Riverside California
| | - Emma L. Aronson
- Department of Microbiology and Plant Pathology, Center for Conservation Biology University of California Riverside Riverside California
| | - Allan Artavia‐León
- Center for Research in Cellular and Molecular Biology University of Costa Rica San José Costa Rica
| | - Diego Dierick
- Department of Biological Sciences Florida International University Miami Florida
| | - Angel S. Fernandez‐Bou
- School of Engineering and Environmental Systems Program University of California Merced Merced California
| | - Thomas C. Harmon
- School of Engineering and Environmental Systems Program University of California Merced Merced California
| | - Catalina Murillo‐Cruz
- Center for Research in Cellular and Molecular Biology University of Costa Rica San José Costa Rica
- Center for Research in Microscopic Structures, Biochemistry Department University of Costa Rica San José Costa Rica
| | - Steven F. Oberbauer
- Department of Biological Sciences Florida International University Miami Florida
| | - Adrián A. Pinto‐Tomás
- Center for Research in Cellular and Molecular Biology University of Costa Rica San José Costa Rica
- Center for Research in Microscopic Structures, Biochemistry Department University of Costa Rica San José Costa Rica
- Biochemistry Department, School of Medicine University of Costa Rica San José Costa Rica
| | - Philip W. Rundel
- Department of Ecology and Evolutionary Biology University of California Los Angeles Los Angeles California
| | | |
Collapse
|
50
|
Tolley SJA, Nonacs P, Sapountzis P. Wolbachia Horizontal Transmission Events in Ants: What Do We Know and What Can We Learn? Front Microbiol 2019; 10:296. [PMID: 30894837 PMCID: PMC6414450 DOI: 10.3389/fmicb.2019.00296] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2018] [Accepted: 02/04/2019] [Indexed: 11/17/2022] Open
Abstract
While strict vertical transmission insures the durability of intracellular symbioses, phylogenetic incongruences between hosts and endosymbionts suggest horizontal transmission must also occur. These horizontal acquisitions can have important implications for the biology of the host. Wolbachia is one of the most ecologically successful prokaryotes in arthropods, infecting an estimated 50–70% of all insect species. Much of this success is likely due to the fact that, in arthropods, Wolbachia is notorious for manipulating host reproduction to favor transmission through the female germline. However, its natural potential for horizontal transmission remains poorly understood. Here we evaluate the fundamental prerequisites for successful horizontal transfer, including necessary environmental conditions, genetic potential of bacterial strains, and means of mediating transfers. Furthermore, we revisit the relatedness of Wolbachia strains infecting the Panamanian leaf-cutting ant, Acromyrmex echinatior, and its inquiline social parasite, Acromyrmex insinuator, and compare our results to a study published more than 15 years ago by Van Borm et al. (2003). The results of this pilot study prompt us to reevaluate previous notions that obligate social parasitism reliably facilitates horizontal transfer and suggest that not all Wolbachia strains associated with ants have the same genetic potential for horizontal transmission.
Collapse
Affiliation(s)
- Sarah J A Tolley
- Department of Ecology and Evolutionary Biology, University of California, Los Angeles, Los Angeles, CA, United States
| | - Peter Nonacs
- Department of Ecology and Evolutionary Biology, University of California, Los Angeles, Los Angeles, CA, United States
| | | |
Collapse
|