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Ten Caten C, Dallas T. Latitudinal specificity of plant-avian frugivore interactions. J Anim Ecol 2024; 93:958-969. [PMID: 38826033 DOI: 10.1111/1365-2656.14116] [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: 09/22/2023] [Accepted: 05/06/2024] [Indexed: 06/04/2024]
Abstract
Broad-scale assessments of plant-frugivore interactions indicate the existence of a latitudinal gradient in interaction specialization. The specificity (i.e. the similarity of the interacting partners) of plant-frugivore interactions could also change latitudinally given that differences in resource availability could favour species to become more or less specific in their interactions across latitudes. Species occurring in the tropics could be more taxonomically, phylogenetically and functionally specific in their interactions because of a wide range of resources that are constantly available in these regions that would allow these species to become more specialized in their resource usage. We used a data set on plant-avian frugivore interactions spanning a wide latitudinal range to examine these predictions, and we evaluated the relationship between latitude and taxonomic, phylogenetic and functional specificity of plant and frugivore interactions. These relationships were assessed using data on population interactions (population level), species means (species level) and community means (community level). We found that the specificity of plant-frugivore interactions is generally not different from null models. Although statistically significant relationships were often observed between latitude and the specificity of plant-frugivore interactions, the direction of these relationships was variable and they also were generally weak and had low explanatory power. These results were consistent across the three specificity measures and levels of organization, suggesting that there might be an interplay between different mechanisms driving the interactions between plants and frugivores across latitudes.
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Affiliation(s)
- Cleber Ten Caten
- Department of Biological Sciences, University of South Carolina, Columbia, South Carolina, USA
- Department of Biological Sciences, Louisiana State University, Baton Rouge, Louisiana, USA
| | - Tad Dallas
- Department of Biological Sciences, University of South Carolina, Columbia, South Carolina, USA
- Department of Biological Sciences, Louisiana State University, Baton Rouge, Louisiana, USA
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Wang Z, Tai W, Zhang X, Liu S, Niu Y, Chen W, Li N. Importance of plant and fruit traits on the structure of bird seed dispersal networks in different disturbed habitats. Integr Zool 2024; 19:753-762. [PMID: 38488176 DOI: 10.1111/1749-4877.12822] [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] [Indexed: 07/12/2024]
Abstract
Species functional traits can influence seed dispersal processes and consequently affect species' role in the mutualistic network. Although the effect of animal traits on the structure of the seed dispersal network is well explored, it remains poorly understood how plant and fruit traits contribute to the structure. We here studied the effects of plant and fruit traits on the structure of bird seed dispersal networks across different disturbed habitats in the Meihua Mountain National Nature Reserve, Southeastern China. During the study period, 16, 20, 13, and 15 bird species were recorded foraging on 10, 11, 12, and 8 plant species, resulting in 511, 312, 265, and 201 foraging events in the protected forest, natural forest, village, and bamboo forest, respectively. The composition of these seed dispersal networks is not primarily influenced by a specific group of bulbul species, but rather by the presence of an endangered plant species, Taxus chinensis. As we expected, the structure of the four networks was different among the four disturbed habitats. Furthermore, our results also showed tree height and canopy density were the most important plant traits for structuring the seed dispersal network, while sugar, amylase, dry matter, and alkaloids were identified as significant fruit traits. Overall, our findings highlight the value of integrating trait-based ecology into the framework of the seed dispersal network and provide new insights for mutualistic network conservation in disturbed habitats.
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Affiliation(s)
- Zheng Wang
- College of Life Science, Nanjing Forestry University, Nanjing, Jiangsu, China
| | - Wei Tai
- College of Life Science, Nanjing Forestry University, Nanjing, Jiangsu, China
| | - Xuan Zhang
- Institute of Applied Ecology, Nanjing Xiaozhuang University, Nanjing, Jiangsu, China
| | - Shouguo Liu
- College of Life Science, Nanjing Forestry University, Nanjing, Jiangsu, China
| | - Yixing Niu
- College of Life Science, Nanjing Forestry University, Nanjing, Jiangsu, China
| | - Wenwen Chen
- School of Resources and Environmental Engineering, Anhui University, Hefei, China
| | - Ning Li
- Institute of Applied Ecology, Nanjing Xiaozhuang University, Nanjing, Jiangsu, China
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3
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Thiel S, Gottstein M, Heymann EW, Kroszewski J, Lieker N, Tello NS, Tschapka M, Junker RR, Heer K. Vertically stratified interactions of nectarivores and nectar-inhabiting bacteria in a liana flowering across forest strata. AMERICAN JOURNAL OF BOTANY 2024; 111:e16303. [PMID: 38531667 DOI: 10.1002/ajb2.16303] [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: 09/07/2023] [Revised: 01/26/2024] [Accepted: 01/29/2024] [Indexed: 03/28/2024]
Abstract
PREMISE Vertical stratification is a key feature of tropical forests and plant-frugivore interactions. However, it is unclear whether equally strong patterns of vertical stratification exist for plant-nectarivore interactions and, if so, which factors drive these patterns. Further, nectar-inhabiting bacteria, acting as "hidden players" in plant-nectarivore interactions, might be vertically stratified, either in response to differences among strata in microenvironmental conditions or to the nectarivore community serving as vectors. METHODS We observed visitations by a diverse nectarivore community to the liana Marcgravia longifolia in a Peruvian rainforest and characterized diversity and community composition of nectar-inhabiting bacteria. Unlike most other plants, M. longifolia produces inflorescences across forest strata, enabling us to study effects of vertical stratification on plant-nectarivore interactions without confounding effects of plant species and stratum. RESULTS A significantly higher number of visits were by nectarivorous bats and hummingbirds in the midstory than in the understory and canopy, and the visits were strongly correlated to flower availability and nectar quantity and quality. Trochiline hummingbirds foraged across all strata, whereas hermits remained in the lower strata. The Shannon diversity index for nectar-inhabiting bacterial communities was highest in the midstory. CONCLUSIONS Our findings suggest that vertical niche differentiation in plant-nectarivore interactions seems to be partly driven by resource abundance, but other factors such as species-specific preferences of hummingbirds, likely caused by competition, play an important role. We conclude that vertical stratification is an important driver of a species' interaction niche highlighting its role for promoting biodiversity and ecosystem functioning.
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Affiliation(s)
- Sarina Thiel
- Department of Biology, Conservation Ecology, Philipps-Universität Marburg, Karl-von-Frisch-Str, 8, Marburg, Germany
| | - Malika Gottstein
- Eva Mayr-Stihl Professorship for Forest Genetics, Albert-Ludwigs-Universität Freiburg, Bertoldstr. 17, Freiburg, Germany
| | - Eckhard W Heymann
- Verhaltensökologie & Soziobiologie, Deutsches Primatenzentrum - Leibniz-Institut für Primatenforschung, Kellnerweg 4, Göttingen, Germany
| | - Jana Kroszewski
- Department of Biology, Conservation Ecology, Philipps-Universität Marburg, Karl-von-Frisch-Str, 8, Marburg, Germany
| | - Narges Lieker
- Department of Biology, Conservation Ecology, Philipps-Universität Marburg, Karl-von-Frisch-Str, 8, Marburg, Germany
| | | | - Marco Tschapka
- Institute of Evolutionary Ecology and Conservation Genomics, University of Ulm, Albert Einstein Allee 11, Ulm, Germany
- Smithsonian Tropical Research Institute, Apartado, 0843-03092, Balboa, Ancon, Republic of Panama
| | - Robert R Junker
- Evolutionary Ecology of Plants, Department of Biology, Philipps-Universität Marburg, Karl-von-Frisch-Str. 8, Marburg, Germany
| | - Katrin Heer
- Eva Mayr-Stihl Professorship for Forest Genetics, Albert-Ludwigs-Universität Freiburg, Bertoldstr. 17, Freiburg, Germany
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4
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Trabelcy B, Shteindel N, Lalzar M, Izhaki I, Gerchman Y. Bacterial detoxification of plant defence secondary metabolites mediates the interaction between a shrub and frugivorous birds. Nat Commun 2023; 14:1821. [PMID: 37002264 PMCID: PMC10066296 DOI: 10.1038/s41467-023-37525-6] [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: 09/09/2022] [Accepted: 03/14/2023] [Indexed: 04/03/2023] Open
Abstract
Many plants produce fleshy fruits, attracting fruit-eating animals that disperse the seeds in their droppings. Such seed dispersal results in a conflict between the plant and the animal, as digestion of seeds can be highly beneficial to the animal but reduces plant fitness. The plant Ochradenus baccatus uses the myrosinase-glucosinolates system to protect its seeds. We show that hydrolysis of the O. baccatus fruit glucosinolates by the myrosinase enzyme inhibited digestive enzymes and hampered digestion in naïve individuals of the bird Pycnonotus xanthopygos. However, digestion in birds regularly feeding on O. baccatus fruits was unaffected. We find that Pantoea bacteria, dominating the gut of these experienced birds as well as the fruits, thrive on glucosinolates hydrolysis products in culture. Augmentation of Pantoea protects both naïve birds and plant seedlings from the effects of glucosinolates hydrolysis products. Our findings demonstrate a tripartite interaction, where the plant-bird mutually beneficial interactions are mediated by a communal bacterial tenant.
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Affiliation(s)
- Beny Trabelcy
- Department of Evolutionary and Environmental Biology, Faculty of Natural Sciences, University of Haifa, Haifa, 3498838, Israel.
| | - Nimrod Shteindel
- Department of Evolutionary and Environmental Biology, Faculty of Natural Sciences, University of Haifa, Haifa, 3498838, Israel
| | - Maya Lalzar
- Bioinformatic Unit, University of Haifa, Haifa, Israel
| | - Ido Izhaki
- Department of Evolutionary and Environmental Biology, Faculty of Natural Sciences, University of Haifa, Haifa, 3498838, Israel
| | - Yoram Gerchman
- Department of Evolutionary and Environmental Biology, Faculty of Natural Sciences, University of Haifa, Haifa, 3498838, Israel.
- Oranim College, Kiryat Tivon, 3600600, Israel.
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5
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Thiel S, Willems F, Farwig N, Rehling F, Schabo DG, Schleuning M, Shahuano Tello N, Töpfer T, Tschapka M, Heymann EW, Heer K. Vertically stratified frugivore community composition and interaction frequency in a liana fruiting across forest strata. Biotropica 2023. [DOI: 10.1111/btp.13216] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
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Durand‐Bessart C, Cordeiro NJ, Chapman CA, Abernethy K, Forget P, Fontaine C, Bretagnolle F. Trait matching and sampling effort shape the structure of the frugivory network in Afrotropical forests. THE NEW PHYTOLOGIST 2023; 237:1446-1462. [PMID: 36377098 PMCID: PMC10108259 DOI: 10.1111/nph.18619] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/13/2021] [Accepted: 10/13/2022] [Indexed: 06/16/2023]
Abstract
Frugivory in tropical forests is a major ecological process as most tree species rely on frugivores to disperse their seeds. However, the underlying mechanisms driving frugivore-plant networks remain understudied. Here, we evaluate the data available on the Afrotropical frugivory network to identify structural properties, as well as assess knowledge gaps. We assembled a database of frugivory interactions from the literature with > 10 000 links, between 807 tree and 285 frugivore species. We analysed the network structure using a block model that groups species with similar interaction patterns and estimates interaction probabilities among them. We investigated the species traits related to this grouping structure. This frugivory network was simplified into 14 tree and 14 frugivore blocks. The block structure depended on the sampling effort among species: Large mammals were better-studied, while smaller frugivores were the least studied. Species traits related to frugivory were strong predictors of the species composition of blocks and interactions among them. Fruits from larger trees were consumed by most frugivores, and large frugivores had higher probabilities to consume larger fruits. To conclude, this large-scale frugivory network was mainly structured by species traits involved in frugivory, and as expected by the distribution areas of species, while still being limited by sampling incompleteness.
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Affiliation(s)
- Clémentine Durand‐Bessart
- Biogeosciences, UMR 6282Université Bourgogne Franche Comte‐CNRS21000DijonFrance
- Centre d'Ecologie et des Sciences de la ConservationCESCO, UMR 7204, MNHN‐CNRS‐SU75005ParisFrance
| | - Norbert J. Cordeiro
- Department of Biology (mc WB 816)Roosevelt University430 S. Michigan AvenueChicagoIL60605USA
- Science & EducationThe Field Museum1400 S. Lake Shore DriveChicagoIL60605USA
| | - Colin A. Chapman
- Wilson Center1300 Pennsylvania Avenue NWWashingtonDC20004USA
- Department of AnthropologyCenter for the Advanced Study of Human Paleobiology, The George Washington UniversityWashingtonDC20037USA
- School of Life SciencesUniversity of KwaZulu‐NatalScottsville3201PietermaritzburgSouth Africa
- Shaanxi Key Laboratory for Animal ConservationNorthwest University710069Xi'anChina
| | - Katharine Abernethy
- African Forest Ecology Group, School of Natural SciencesUniversity of StirlingStirlingFK9 4LAUK
- Institut de Recherches en Ecologie TropicaleCENARESTGros Bouquet2144LibrevilleGabon
| | - Pierre‐Michel Forget
- Muséum National d'Histoire NaturelleUMR 7179 MECADEV CNRS‐MNHN1 Avenue du Petit Château91800BrunoyFrance
| | - Colin Fontaine
- Centre d'Ecologie et des Sciences de la ConservationCESCO, UMR 7204, MNHN‐CNRS‐SU75005ParisFrance
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7
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Buono CM, Lofaso J, Smisko W, Gerth C, Santare J, Prior KM. Historical forest disturbance results in variation in functional resilience of seed dispersal mutualisms. Ecology 2023; 104:e3978. [PMID: 36692005 DOI: 10.1002/ecy.3978] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/06/2022] [Revised: 12/05/2022] [Accepted: 12/13/2022] [Indexed: 01/25/2023]
Abstract
Mutualistic interactions provide essential ecosystem functions that contribute to promoting and maintaining diversity in ecosystems. Understanding if functionally important mutualisms are "resilient" (i.e., able to resist or recover) to anthropogenic disturbance is essential for revealing the capacity for diversity to recover. Animal-mediated seed dispersal supports plant population growth and influences community structure, and disturbance affecting seed dispersal can contribute to low resiliency of plant diversity. Ant-seed dispersal mutualisms are sensitive to anthropogenic disturbance, as they rely on one to a few high-quality dispersal partners. In North American eastern deciduous forests, ants in the genus Aphaenogaster are "keystone dispersers" of understory forbs adapted to dispersal by ants (myrmecochores), which make up more than one-third of the understory herbaceous community. The majority of forests within this region have regenerated from previous disturbance in the form of clearing for agriculture. Previous studies have revealed that myrmecochore diversity is not resilient to previous clearing. Here, we ask if seed dispersal mutualisms are resilient to historical forest disturbance and if decreases in mutualistic interactions with partners, Aphaenogaster sp., or increases in antagonistic interactions cause degradation of function. In a large-scale natural experiment (20 sites), we measured seed removal, the abundance of mutualistic partners and other invertebrates interacting with seeds, myrmecochore cover, and diversity, along with ant habitat and forest structure. We found lower and more variable seed removal in secondary forests compared with remnant forests. A path analysis of all forests revealed that the abundance of mutualists was the primary determinant of the variation in seed removal, and that seed damage by antagonists (invasive slugs) negatively affected dispersal and was higher in secondary forests. In a path analysis of remnant forests, the link between mutualist abundance and seed removal was absent, but present in the secondary forest path, suggesting that seed dispersal is more variable and dependent on the mutualist abundance in secondary forests and is stable and high in remnant forests. Our results suggest that functional resilience to disturbance is variable, where seed dispersal is low in some secondary forests and not others. This work provides key insights into the effects of disturbance on mutualistic interactions and how the resilience of critical ecosystem functions impacts the capacity for diversity resiliency.
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Affiliation(s)
- Carmela M Buono
- Department of Biological Sciences, Binghamton University, Binghamton, New York, USA
| | - Jesse Lofaso
- Department of Biological Sciences, Binghamton University, Binghamton, New York, USA
| | - Will Smisko
- Department of Biological Sciences, Binghamton University, Binghamton, New York, USA
| | - Carly Gerth
- Department of Biological Sciences, Binghamton University, Binghamton, New York, USA
| | - John Santare
- Department of Biological Sciences, Binghamton University, Binghamton, New York, USA
| | - Kirsten M Prior
- Department of Biological Sciences, Binghamton University, Binghamton, New York, USA
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8
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Martins LP, Stouffer DB, Blendinger PG, Böhning-Gaese K, Buitrón-Jurado G, Correia M, Costa JM, Dehling DM, Donatti CI, Emer C, Galetti M, Heleno R, Jordano P, Menezes Í, Morante-Filho JC, Muñoz MC, Neuschulz EL, Pizo MA, Quitián M, Ruggera RA, Saavedra F, Santillán V, Sanz D'Angelo V, Schleuning M, da Silva LP, Ribeiro da Silva F, Timóteo S, Traveset A, Vollstädt MGR, Tylianakis JM. Global and regional ecological boundaries explain abrupt spatial discontinuities in avian frugivory interactions. Nat Commun 2022; 13:6943. [PMID: 36376314 PMCID: PMC9663448 DOI: 10.1038/s41467-022-34355-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Accepted: 10/20/2022] [Indexed: 11/16/2022] Open
Abstract
Species interactions can propagate disturbances across space via direct and indirect effects, potentially connecting species at a global scale. However, ecological and biogeographic boundaries may mitigate this spread by demarcating the limits of ecological networks. We tested whether large-scale ecological boundaries (ecoregions and biomes) and human disturbance gradients increase dissimilarity among plant-frugivore networks, while accounting for background spatial and elevational gradients and differences in network sampling. We assessed network dissimilarity patterns over a broad spatial scale, using 196 quantitative avian frugivory networks (encompassing 1496 plant and 1004 bird species) distributed across 67 ecoregions, 11 biomes, and 6 continents. We show that dissimilarities in species and interaction composition, but not network structure, are greater across ecoregion and biome boundaries and along different levels of human disturbance. Our findings indicate that biogeographic boundaries delineate the world's biodiversity of interactions and likely contribute to mitigating the propagation of disturbances at large spatial scales.
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Affiliation(s)
- Lucas P Martins
- Centre for Integrative Ecology, School of Biological Sciences, University of Canterbury, Private bag 4800, Christchurch, 8140, Aotearoa New Zealand.
| | - Daniel B Stouffer
- Centre for Integrative Ecology, School of Biological Sciences, University of Canterbury, Private bag 4800, Christchurch, 8140, Aotearoa New Zealand
| | - Pedro G Blendinger
- Instituto de Ecología Regional, Universidad Nacional de Tucumán and CONICET; CC 34, 4107, Tucumán, Argentina
- Facultad de Ciencias Naturales e Instituto Miguel Lillo, Universidad Nacional de Tucumán, Miguel Lillo 2005, 4000, Tucumán, Argentina
| | - Katrin Böhning-Gaese
- Senckenberg Biodiversity and Climate Research Centre (SBiK-F), Senckenberganlage 25, 60325, Frankfurt am Main, Germany
- Institute for Ecology, Evolution and Diversity, Goethe University Frankfurt, Max-von-Laue-Straße 13, Frankfurt am Main, 60439, Germany
| | - Galo Buitrón-Jurado
- Laboratorio de Biología de Organismos, Centro de Ecología, Instituto Venezolano de Investigaciones Científicas (IVIC), Carretera Panamericana, km 11, Altos de Pipe, Edo, Miranda, Venezuela
- Universidad Estatal Amazónica-Sede Zamora Chinchipe; Calle Luis Imaicela entre Azuay y Rene Ulloa, El Pangui, Zamora Chinchipe, Ecuador
| | - Marta Correia
- Centre for Functional Ecology, Associate Laboratory TERRA, Department of Life Sciences, University of Coimbra, Calçada Martim de Freitas, 3000-456, Coimbra, Portugal
| | - José Miguel Costa
- Centre for Functional Ecology, Associate Laboratory TERRA, Department of Life Sciences, University of Coimbra, Calçada Martim de Freitas, 3000-456, Coimbra, Portugal
| | - D Matthias Dehling
- Swiss Federal Research Institute WSL, Zürcherstrasse 111, 8903, Birmensdorf, Switzerland
- Securing Antarctica's Environmental Future, School of Biological Sciences, Monash University, Melbourne, Victoria, 3800, Australia
| | - Camila I Donatti
- Conservation International, 2011 Crystal Dr. Suite 600, Arlington, VA, 22202, USA
- Department of Biological Sciences, Northern Arizona University, 617S. Beaver St., Flagstaff, AZ, 86011-5640, USA
| | - Carine Emer
- Rio de Janeiro Botanical Garden Research Institute, Rua Pacheco Leão 915, Jardim Botânico, Rio de Janeiro, RJ, CEP 22460-030, Brazil
- Department of Biodiversity, São Paulo State University - UNESP, Rio Claro, SP, Brazil
| | - Mauro Galetti
- Department of Biodiversity, São Paulo State University - UNESP, Rio Claro, SP, Brazil
| | - Ruben Heleno
- Centre for Functional Ecology, Associate Laboratory TERRA, Department of Life Sciences, University of Coimbra, Calçada Martim de Freitas, 3000-456, Coimbra, Portugal
| | - Pedro Jordano
- Estación Biológica de Doñana, CSIC, av. Americo Vespucio 26, 41092, Sevilla, Spain
- Departamento de Biología Vegetal y Ecología, Universidad de Sevilla, Sevilla, Spain
| | - Ícaro Menezes
- Applied Conservation Ecology Lab, Santa Cruz State University, Rodovia Ilhéus- Itabuna, km 16, Salobrinho, Ilhéus, Bahia, 45662-000, Brazil
| | - José Carlos Morante-Filho
- Applied Conservation Ecology Lab, Santa Cruz State University, Rodovia Ilhéus- Itabuna, km 16, Salobrinho, Ilhéus, Bahia, 45662-000, Brazil
| | - Marcia C Muñoz
- Programa de Biología, Universidad de La Salle, Carrera 2 # 10-70, Bogotá, Colombia
| | - Eike Lena Neuschulz
- Senckenberg Biodiversity and Climate Research Centre (SBiK-F), Senckenberganlage 25, 60325, Frankfurt am Main, Germany
| | - Marco Aurélio Pizo
- Department of Biodiversity, São Paulo State University - UNESP, Rio Claro, SP, Brazil
| | - Marta Quitián
- Systematic Zoology Laboratory, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji-shi, Tokyo, 192-0397, Japan
- Instituto Mediterráneo de Estudios Avanzados (CSIC-UIB), Miquel Marqués 21, Mallorca, Balearic Islands, 07190, Esporles, Spain
| | - Roman A Ruggera
- Instituto de Ecorregiones Andinas (Consejo Nacional de Investigaciones Científicas y Técnicas - Universidad Nacional de Jujuy), Canónigo Gorriti 237, Y4600 San Salvador de Jujuy, Jujuy, Argentina
| | - Francisco Saavedra
- Instituto de Ecología, Facultad de Ciencias Puras y Naturales, Universidad Mayor de San Andrés, La Paz, Bolivia
| | - Vinicio Santillán
- Centro de Investigación, Innovación y Transferencia de Tecnología (CIITT), Unidad Académica de Posgrado, Universidad Católica de Cuenca, Av. de las Américas, Cuenca, Ecuador
| | - Virginia Sanz D'Angelo
- Laboratorio de Biología de Organismos, Centro de Ecología, Instituto Venezolano de Investigaciones Científicas (IVIC), Carretera Panamericana, km 11, Altos de Pipe, Edo, Miranda, Venezuela
| | - Matthias Schleuning
- Senckenberg Biodiversity and Climate Research Centre (SBiK-F), Senckenberganlage 25, 60325, Frankfurt am Main, Germany
| | - Luís Pascoal da Silva
- CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO Laboratório Associado, Campus de Vairão, Universidade do Porto, 4485-661, Vairão, Portugal
- BIOPOLIS Program in Genomics, Biodiversity and Land Planning, CIBIO, Campus de Vairão, 4485-661, Vairão, Portugal
| | - Fernanda Ribeiro da Silva
- Laboratory of Human Ecology and Ethnobotany, Department of Ecology and Zoology, Federal University of Santa Catarina, UFSC, Campus Trindade, s/n, Florianópolis, SC, 88010-970, Brazil
| | - Sérgio Timóteo
- Centre for Functional Ecology, Associate Laboratory TERRA, Department of Life Sciences, University of Coimbra, Calçada Martim de Freitas, 3000-456, Coimbra, Portugal
| | - Anna Traveset
- Instituto Mediterráneo de Estudios Avanzados (CSIC-UIB), Miquel Marqués 21, Mallorca, Balearic Islands, 07190, Esporles, Spain
| | - Maximilian G R Vollstädt
- Section for Molecular Ecology and Evolution, Globe Institute, University of Copenhagen, Oester Voldgade 5-7, 1350, Copenhagen K, Denmark
| | - Jason M Tylianakis
- Centre for Integrative Ecology, School of Biological Sciences, University of Canterbury, Private bag 4800, Christchurch, 8140, Aotearoa New Zealand.
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9
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Li N, Tang N, Ren Y, Wang Z. Effects of forest ropeway construction on bird diversity and its seed dispersal mutualism for endangered Taxus chinensis, southeast China. Glob Ecol Conserv 2022. [DOI: 10.1016/j.gecco.2022.e02227] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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10
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Li N, Yang X, Ren Y, Wang Z. Importance of species traits on individual-based seed dispersal networks and dispersal distance for endangered trees in a fragmented forest. FRONTIERS IN PLANT SCIENCE 2022; 13:1010352. [PMID: 36212316 PMCID: PMC9534520 DOI: 10.3389/fpls.2022.1010352] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Accepted: 09/05/2022] [Indexed: 06/16/2023]
Abstract
Although mutualistic network analyses have sparked a renewed interest in the patterns and drivers of network structures within communities, few studies have explored structural patterns within populations. In an endangered tree species population, plant individuals share their bird seed dispersers; however, the factors affecting individual interaction patterns are poorly understood. In this study, four individual-based networks were built for the endangered Chinese yew, Taxus chinensis, in a fragmented forest based on bird foraging type (swallowing and pecking networks) and habitat type (networks in a bamboo patch and an evergreen broad-leaved forest patch). Species-level network metrics (species degree and specialization, d') were used to evaluate the effects of species traits (bird and plant traits) on species-level networks and dispersal distance for T. chinensis. It was revealed that the interaction networks between T. chinensis individuals and their bird partners were influenced by foraging type and the habitat of plant distribution. Compared to the other two networks, bird swallowing and bird-fruit networks in the evergreen broad-leaved patch habitat had higher nestedness and connectance but lower modules and specialization. Bird (body weight and wing and bill lengths) and plant traits (height, crop size, and cover) significantly affected species-level network metrics such as degree and specialization. Furthermore, seed dispersal distance was influenced by species traits and the species-level metrics of fruit-bird interaction networks. These results provide new insights into individual-based seed dispersal mutualistic networks of endangered plant species under habitat fragmentation. Moreover, these findings have relevant implications for conserving and managing individual endangered trees in increasingly disturbed ecosystems.
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Affiliation(s)
- Ning Li
- Institute of Applied Ecology, Nanjing Xiaozhuang University, Nanjing, China
| | - Xifu Yang
- State Key Laboratory of Integrated Management of Pest Insects and Rodents in Agriculture, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Yuanhao Ren
- Institute of Applied Ecology, Nanjing Xiaozhuang University, Nanjing, China
| | - Zheng Wang
- College of Biology and Environmental Science, Nanjing Forestry University, Nanjing, China
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11
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Mubamba S, Nduna N, Siachoono S, Chibesa M, Phiri D, Chama L. Plant-frugivore networks are robust to species loss even in highly built-up urban ecosystems. Oecologia 2022; 199:637-648. [PMID: 35781743 DOI: 10.1007/s00442-022-05213-9] [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: 02/19/2022] [Accepted: 06/14/2022] [Indexed: 11/29/2022]
Abstract
Animal seed dispersal processes are an important aspect of ecosystem services, as they shape the survival of seed dispersers and the balanced distribution of propagules for many plant communities. Several studies within tropical wild ecosystems have generally shown that seed dispersal processes are highly generalised and robust to extinction. Studies examining seed dispersal networks in highly built-up urban ecosystems and their robustness to species loss or extinction are rare. We examined avian seed dispersal networks across an urban ecosystem characterised by a high human settlement and infrastructure of the built environment in Zambia to determine their network specialisation, interaction evenness and interaction diversity, as these three parameters are critical in driving the resilience of these mutualisms' interactions against extinction. A total of 405 individuals representing 11 species of birds were observed and recorded feeding on a total of 11 focal fleshy-fruiting plant species. Network specialisation was generally low and remained similar across study areas. Interaction evenness and interaction diversity were not only high but also remained similar across study areas. Low specialisation and high interaction evenness and diversity show that mutualistic interactions in these networks are equally highly generalised, suggesting a stable and robust coexistence of species in plant-frugivore communities within urban ecosystems. Generally, our results seem to broadly suggest that opportunities for conservation still exist in these ecosystems provided urbanisation is accompanied by promoting either the management of remnant fruiting plants or the cultivation of new ones to support the avian communities existing in these areas.
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Affiliation(s)
- Saidy Mubamba
- Department of Zoology, Copperbelt University, Jambo Drive, Riverside, P.O. Box 21692, Kitwe, Zambia
| | - Norman Nduna
- Department of Zoology, Copperbelt University, Jambo Drive, Riverside, P.O. Box 21692, Kitwe, Zambia
| | - Stanford Siachoono
- Department of Zoology, Copperbelt University, Jambo Drive, Riverside, P.O. Box 21692, Kitwe, Zambia
| | - Moses Chibesa
- Department of Zoology, Copperbelt University, Jambo Drive, Riverside, P.O. Box 21692, Kitwe, Zambia
| | - Darius Phiri
- Department of Plant and Environmental Sciences, Copperbelt University, Jambo Drive, Riverside, P.O. Box 21692, Kitwe, Zambia
| | - Lackson Chama
- Department of Zoology, Copperbelt University, Jambo Drive, Riverside, P.O. Box 21692, Kitwe, Zambia.
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12
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Vitorino BD, Frota AVBD, Maruyama PK, Nunes JRDS, Vizentin-Bugoni J. Influence of sampling methods on the description of a Neotropical seed dispersal network. ACTA OECOLOGICA 2022. [DOI: 10.1016/j.actao.2021.103805] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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13
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Response of avian and mammal seed dispersal networks to human-induced forest edges in a sub-humid tropical forest. JOURNAL OF TROPICAL ECOLOGY 2022. [DOI: 10.1017/s0266467422000062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Abstract
Species-rich ecosystems as tropical forests are extremely vulnerable to anthropogenic destruction. Most tropical plant species rely on animals to disperse their seeds. However, patterns of mutualistic interactions have rarely been explored, and seed dispersal networks are still poorly studied in Africa. Here, we examine how forest edges’ (FE) seed dispersal networks differ from the mature forest (MF) at a West African sub-humid tropical forest within the National Park of Cantanhez (Guinea-Bissau). Additionally, we explore species’ roles within the network. MF had higher fruit availability, more frugivore visitors, and plant–frugivore interactions. Network structure was quite similar between habitats, showing signs of redundancy, and some robustness to species’ extinction. FE was more nested, modular, and specialized, whereas MF had higher connectance, interaction evenness, and robustness to extinction. Most species were generalists, but large-bodied frugivores prevailed at MF. FE showed a higher vulnerability, mostly to the loss of trees. Trees are key, keeping the structure of both networks. Large-bodied frugivores and fruiting-tree species that work as network connectors should thus be the focus of active conservation management in these forests. Only viable populations of these species will ensure a good performance of the seed dispersal network, promoting the natural regeneration of the ecosystem.
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14
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Vissoto M, Vizentin-Bugoni J, Sendoya SF, Gomes GC, Dias RA. Plant height and spatial context influence individual connectivity and specialization on seed dispersers in a tree population. Oecologia 2022; 198:721-731. [PMID: 35292859 DOI: 10.1007/s00442-022-05142-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Accepted: 02/18/2022] [Indexed: 10/18/2022]
Abstract
While network analyses have stimulated a renewed interest in understanding patterns and drivers of specialization within communities, few studies have explored specialization within populations. Thus, in plant populations, causes and consequences of individual variation in their interactions with mutualistic animals remain poorly understood. Studying a Brazilian pepper (Schinus terebinthifolia) population, we measured the extent of individual variation in interactions with seed dispersers and tested whether connectivity (number of seed dispersers) and specialization (exclusiveness of partners) are associated with phenotypic and phenological traits of individuals and their spatial context. We found that: (i) individuals varied broadly in their connectivity and specialization on seed dispersers; (ii) phenotypic traits and spatial context matter more than fruiting duration in determining how many and how exclusive are seed dispersers of an individual; (iii) the individual-based network was nested and indicated that the less connected individuals were shorter, occurred in neighborhoods with fewer fruits, and tended to interact with a subset of the partners of more generalist individuals which, in turn, were taller and inserted in higher fruit density neighborhoods; (iv) modularity indicated the existence of subsets of individuals that interacted disproportionately with distinct groups of partners, which may occur due to differences in bird habitat use across the landscape. Our study underlines a remarkable interindividual variation that is overlooked when interactions are compiled to describe species-level interactions. Traits and spatial contexts that define variation among individuals may have important implications not only for fitness but also for sampling and description of interactions at species level.
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Affiliation(s)
- Maiara Vissoto
- Programa de Pós-Graduação em Biologia Animal, Departamento de Ecologia, Zoologia e Genética, Universidade Federal de Pelotas, Pelotas, Rio Grande do Sul, Brazil. .,Programa de Pós-Graduação em Ecologia e Conservação, Instituto de Biociências, Universidade Federal de Mato Grosso do Sul, Campo Grande, Mato Grosso do Sul, Brazil.
| | - Jeferson Vizentin-Bugoni
- Programa de Pós-Graduação em Biologia Animal, Departamento de Ecologia, Zoologia e Genética, Universidade Federal de Pelotas, Pelotas, Rio Grande do Sul, Brazil.,Programa de Pós-Graduação em Ecologia, Departamento de Ecologia, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - Sebastian F Sendoya
- Programa de Pós-Graduação em Biologia Animal, Departamento de Ecologia, Zoologia e Genética, Universidade Federal de Pelotas, Pelotas, Rio Grande do Sul, Brazil
| | - Gustavo C Gomes
- Programa de Pós-Graduação em Desenvolvimento Territorial e Sistemas Agroindustriais, Universidade Federal de Pelotas, Pelotas, Rio Grande do Sul, Brazil
| | - Rafael A Dias
- Programa de Pós-Graduação em Biologia Animal, Departamento de Ecologia, Zoologia e Genética, Universidade Federal de Pelotas, Pelotas, Rio Grande do Sul, Brazil
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15
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Pizo MA, Fontanella AB, Carlo TA, González‐Castro A. Abundance predominates over niche factors as determinant of the frequency of interactions between frugivorous birds and plants. Biotropica 2022. [DOI: 10.1111/btp.13076] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Marco A. Pizo
- Departamento de Biodiversidade Instituto de Biociências Universidade Estadual Paulista Rio Claro, São Paulo Brazil
| | - Antonio B. Fontanella
- Departamento de Biodiversidade Instituto de Biociências Universidade Estadual Paulista Rio Claro, São Paulo Brazil
| | - Tomás A. Carlo
- Biology Department & Ecology Program Penn State University University Park Pennsylvania USA
| | - Aarón González‐Castro
- Canary Islands’ Ornithology and Natural History Group (GOHNIC) Buenavista del Norte Spain
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16
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Fuzessy L, Sobral G, Carreira D, Rother DC, Barbosa G, Landis M, Galetti M, Dallas T, Cardoso Cláudio V, Culot L, Jordano P. Functional roles of frugivores and plants shape hyper‐diverse mutualistic interactions under two antagonistic conservation scenarios. Biotropica 2022. [DOI: 10.1111/btp.13065] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Lisieux Fuzessy
- São Paulo State University UNESP Rio Claro SP Brazil
- Estación Biológica de Doñana EBD‐CSIC Sevilla Spain
| | | | - Daiane Carreira
- University of São Paulo Escola Superior de Agricultura "Luiz de Queiroz" Esalq USP Piracicaba SP Brazil
| | - Débora Cristina Rother
- University of São Paulo USP São Paulo SP Brazil
- University of São Paulo Escola Superior de Agricultura "Luiz de Queiroz" Esalq USP Piracicaba SP Brazil
| | | | | | - Mauro Galetti
- São Paulo State University UNESP Rio Claro SP Brazil
- Department of Biology University of Miami Coral Gables Florida USA
| | - Tad Dallas
- Louisiana State University Baton Rouge Louisiana USA
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17
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Pires LP, Paniago LPM, Santos YR, Melo C. Seasonality drives variation in the use of forest strata by adult males of a dimorphic frugivorous bird species. AUSTRAL ECOL 2021. [DOI: 10.1111/aec.13129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Luís Paulo Pires
- Instituto de Biologia Universidade Federal de Uberlândia Campus Umuarama Uberlândia Minas Gerais Brazil 38400‐902
| | - Luís Pedro Mendes Paniago
- Instituto de Biologia Universidade Federal de Uberlândia Campus Umuarama Uberlândia Minas Gerais Brazil 38400‐902
| | - Yasmin Regina Santos
- Instituto de Biologia Universidade Federal de Uberlândia Campus Umuarama Uberlândia Minas Gerais Brazil 38400‐902
| | - Celine Melo
- Instituto de Biologia Universidade Federal de Uberlândia Campus Umuarama Uberlândia Minas Gerais Brazil 38400‐902
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18
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Jaafar R, Yadok BG, Elisha EB, Chapman HM. Grassland trees and the common bulbul
Pycnonotus barbatus
promote Afromontane forest restoration. Biotropica 2021. [DOI: 10.1111/btp.12986] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ridwan Jaafar
- Ecology and Biodiversity Department Biology Vrije Universiteit Brussels Brussels Belgium
| | | | | | - Hazel M. Chapman
- School of Biological Sciences University of Canterbury Christchurch New Zealand
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19
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Raiol RL, Gastauer M, Campbell AJ, Borges RC, Awade M, Giannini TC. Specialist Bee Species Are Larger and Less Phylogenetically Distinct Than Generalists in Tropical Plant–Bee Interaction Networks. Front Ecol Evol 2021. [DOI: 10.3389/fevo.2021.699649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Bee pollinators are key components of terrestrial ecosystems. Evidence is mounting that bees are globally in decline, and species with a higher degree of specialization are the most vulnerable to local extinction. However, ecological features that could explain bee specialization remain poorly tested, especially in tropical species. Here, we aim to determine the most specialized bee species and their associated ecological traits in tropical plant–bee interaction networks, answering three questions: (1) Which bees in the interaction networks are specialists? (2) Is body size related to their role as specialists in interaction networks? (3) Are there phylogenetic relationships between the bee species identified as specialists? We used fifteen quantitative plant–bee interaction networks from different Brazilian biomes covering 1,702 interactions (386 bee and 717 plant species). We used the normalized degree (standardized number of partners) as a metric to determine trophic specialization of bee species. Body size was estimated by measuring intertegular distance (ITD), i.e., the distance between the bases of the wings on the thorax. Evolutionary distinctiveness (ED) was used to quantify species uniqueness, i.e., the singularity of species in the phylogenetic tree. Relationships between dietary specialism, ITD and ED were assessed using generalized linear models. We detected 34 specialist bee species (9% of total species), distributed in 13 genera, and four families. ITD and ED were important variables explaining the specialization of tropical bee species. Specialists were larger and less phylogenetically distinct than expected by chance. Based on a large data set covering some of the main tropical biomes, our results suggest that loss of specialist bees from Brazilian plant–bee networks could have deleterious consequences for native plant species preferentially pollinated by large-bodied bees. Moreover, by affecting more evolutionarily distinct species, i.e., those with fewer extant relatives, the loss of specialist bees will likely affect few clades but can result on considerable loss of evolutionary history and phylogenetic diversity in the Brazilian bee communities. The results are important for decision-making concerning conservation measures for these species and may also encourage the development of sustainable management techniques for bees.
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20
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Liu B, Wang G, An Y, Xue D, Wang L, Lu C. Similar seed dispersal systems by local frugivorous birds in native and alien plant species in a coastal seawall forest. PeerJ 2021; 9:e11672. [PMID: 34221739 PMCID: PMC8231312 DOI: 10.7717/peerj.11672] [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: 12/10/2020] [Accepted: 06/03/2021] [Indexed: 11/24/2022] Open
Abstract
Frugivorous birds play an important role in seed dispersal. Alien plant species' seeds are dispersed by local birds in order to establish populations in new habitats. Alien plant species that produce fruits similar to that of native species have the potential to attract local birds, creating new mutualistic systems that are similar to the local ones. In autumn 2018 and 2019, we studied the seed dispersal systems of an alien plant species, Phytolacca americana, and a native species, Cayratia japonica, in a coastal seawall forest. Both plant species' fruit, frugivorous bird foraging behaviors, seed germination rates, and seedling microhabitats were examined to determine whether the alien species had a similar seed dispersal system to that of the native species. Our results showed that P. americana and C. japonica had similar fruit type, color, and ripening period. There was a positive correlation between the percentage rate of fruit ripening and the percentage rate of fruit missing for both plant species, indicating that local frugivorous birds have the potential to sufficiently disperse the alien seeds to enable its spread in the coastal seawall forest (simple linear regression, P. americana: β = 0.863 ± 0.017, R2 adj = 0.978, P < 0.01; C. japonica: β = 0.787 ± 0.034, R2 adj = 0.898, P < 0.01). Eleven bird species consumed the fruits of the alien species or native species during the study period. Similar results were shown across alien and native species in bird foraging behavior (feeding frequency, feeding duration and first stop distance) indicating that a similar seed dispersal relationship had been established between local frugivorous and both plant species. The alien plant had a higher number of fruits carried by birds, suggesting that P. americana had a slightly higher fruit consumption than that of C. japonica (t-test, P < 0.01). Alien plant seedlings grow more abundant in forest gap microhabitat (t-test, P < 0.01). Our results confirmed that bird digestion promotes seed germination success in both plant species. Our study suggests that in a narrow coastal seawall forest, alien plant species can successfully establish their populations by relying on similar seed dispersal systems as the local species.
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Affiliation(s)
- Bin Liu
- College of Biology and the Environment, Nanjing Forestry University, Nanjing, Jiangsu, China
- Management Bureau of Dafeng Milu National Nature Reserve, Yancheng, Jiangsu, China
| | - Guohai Wang
- College of Biology and the Environment, Nanjing Forestry University, Nanjing, Jiangsu, China
| | - Yuting An
- Management Bureau of Dafeng Milu National Nature Reserve, Yancheng, Jiangsu, China
| | - Dandan Xue
- Management Bureau of Dafeng Milu National Nature Reserve, Yancheng, Jiangsu, China
| | - Libo Wang
- Management Bureau of Dafeng Milu National Nature Reserve, Yancheng, Jiangsu, China
| | - Changhu Lu
- College of Biology and the Environment, Nanjing Forestry University, Nanjing, Jiangsu, China
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21
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Sengupta A. Animal‐mediated seed dispersal in India: Implications for conservation of India’s biodiversity. Biotropica 2021. [DOI: 10.1111/btp.12982] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Asmita Sengupta
- Ashoka Trust for Research in Ecology and the Environment Bangalore Karnataka India
- National Institute of Advanced Studies Bangalore Karnataka India
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22
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Parker WJ, Buono CM, Prior KM. Antagonistic and mutualistic interactions alter seed dispersal of understory plants at forest edges. Ecosphere 2021. [DOI: 10.1002/ecs2.3397] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Affiliation(s)
- Wyatt J. Parker
- Department of Biological Sciences Binghamton UniversityState University of New York PO Box 6000 Binghamton New York13902USA
- Environmental Studies Program Binghamton UniversityState University of New York PO Box 6000 Binghamton New York13902USA
| | - Carmela M. Buono
- Department of Biological Sciences Binghamton UniversityState University of New York PO Box 6000 Binghamton New York13902USA
| | - Kirsten M. Prior
- Department of Biological Sciences Binghamton UniversityState University of New York PO Box 6000 Binghamton New York13902USA
- Environmental Studies Program Binghamton UniversityState University of New York PO Box 6000 Binghamton New York13902USA
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23
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Corral A, Valério LM, Cheung KC, dos Santos Ferreira BH, Guerra A, Szabo JK, Reis LK. Plant-bird mutualistic interactions can contribute to the regeneration of forest and non-forest urban patches in the Brazilian Cerrado. Urban Ecosyst 2021. [DOI: 10.1007/s11252-020-01029-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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24
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Pires LP, Melo CD. Seasonal consistency of the assembling rules in a bird-fruiting plant network. ECOLOGICAL COMPLEXITY 2020. [DOI: 10.1016/j.ecocom.2020.100869] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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25
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Thiel S, Tschapka M, Heymann EW, Heer K. Vertical stratification of seed-dispersing vertebrate communities and their interactions with plants in tropical forests. Biol Rev Camb Philos Soc 2020; 96:454-469. [PMID: 33140576 DOI: 10.1111/brv.12664] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Revised: 10/22/2020] [Accepted: 10/23/2020] [Indexed: 11/27/2022]
Abstract
Vertical stratification (VS) is a widespread phenomenon in plant and animal communities in forests and a key factor for structuring their species richness and biodiversity, particularly in tropical forests. The organisms composing forest communities adjust and shape the complex three-dimensional structure of their environment and inhabit a large variety of niches along the vertical gradient of the forest. Even though the degree of VS varies among different vertebrate groups, patterns of compositional stratification can be observed across taxa. Communities of birds, bats, primates, and non-flying small mammals are vertically stratified in terms of abundance, species richness, diversity, and community composition. Frugivorous members of these taxa play important roles as seed dispersers and forage on fruit resources that, in turn, vary in quantity and nutritional value along the vertical gradient. As a consequence, plant-seed disperser interaction networks differ among strata, which is manifested in differences in interaction frequencies and the degree of mutual specialization. In general, the canopy stratum is composed of strong links and generalized associations, while the lower strata comprise weaker links and more specialized interactions. Investigating the VS of communities can provide us with a better understanding of species habitat restrictions, resource use, spatial movement, and species interactions. Especially in the face of global change, this knowledge will be important as these characteristics can imply different responses of species and taxa at a fine spatial scale.
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Affiliation(s)
- Sarina Thiel
- Department of Conservation Biology, Philipps University Marburg, Karl-von-Frisch-Strasse 8, Marburg, Germany
| | - Marco Tschapka
- Institute of Evolutionary Ecology and Conservation Genomics, University of Ulm, Albert Einstein Allee 11, Ulm, Germany.,Smithsonian Tropical Research Institute, Apartado, 0843-03092, Balboa, Ancon, Republic of Panama
| | - Eckhard W Heymann
- Verhaltensökologie & Soziobiologie, Deutsches Primatenzentrum - Leibniz-Institut für Primatenforschung, Kellnerweg 4, Göttingen, Germany
| | - Katrin Heer
- Department of Conservation Biology, Philipps University Marburg, Karl-von-Frisch-Strasse 8, Marburg, Germany
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26
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Bitani N, Ehlers Smith DA, Ehlers Smith YC, Downs CT. Functional traits vary among fleshy-fruited invasive plant species and their potential avian dispersers. ACTA OECOLOGICA 2020. [DOI: 10.1016/j.actao.2020.103651] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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27
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Purificação KN, Pascotto MC, Pedroni F, Mews HA, Lima-Junior DP. Disentangling the architecture of the frugivorous bird-plant interaction networks in a savanna-forest mosaic in the Neotropical savanna. ACTA OECOLOGICA 2020. [DOI: 10.1016/j.actao.2020.103601] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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28
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Ohlsson M, Eklöf A. Spatial resolution and location impact group structure in a marine food web. Ecol Lett 2020; 23:1451-1459. [PMID: 32656918 DOI: 10.1111/ele.13567] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2019] [Revised: 12/27/2019] [Accepted: 05/20/2020] [Indexed: 12/01/2022]
Abstract
Ecological processes in food webs depend on species interactions. By identifying broad-scaled interaction patterns, important information on species' ecological roles may be revealed. Here, we use the group model to examine how spatial resolution and proximity influence group structure. We examine a data set from the Barents Sea, with food webs described for both the whole region and 25 subregions. We test how the group structure in the networks differ comparing (1) the regional metaweb to subregions and (2) subregion to subregion. We find that more than half the species in the metaweb change groups when compared to subregions. Between subregions, networks with similar group structure are spatially related. Interestingly, although species overlap is important for similarity in group structure, there are notable exceptions. Our results highlight that species ecological roles vary depending on fine-scaled differences in the patterns of interactions, and that local network characteristics are important to consider.
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Affiliation(s)
- Mikael Ohlsson
- Department of Physics, Chemistry and Biology, Linköping University, Linköping, SE-581 83, Sweden
| | - Anna Eklöf
- Department of Physics, Chemistry and Biology, Linköping University, Linköping, SE-581 83, Sweden
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29
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Acevedo-Quintero JF, Zamora-Abrego JG, García D. From structure to function in mutualistic interaction networks: Topologically important frugivores have greater potential as seed dispersers. J Anim Ecol 2020; 89:2181-2191. [PMID: 32495479 DOI: 10.1111/1365-2656.13273] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Accepted: 05/18/2020] [Indexed: 11/29/2022]
Abstract
Networks of mutualistic interactions between animals and plants are considered a pivotal part of ecological communities. However, mutualistic networks are rarely studied from the perspective of species-specific roles, and it remains to be established whether those animal species more relevant for network structure also contribute more to the ecological functions derived from interactions. Here, we relate the contribution to seed dispersal of vertebrate species with their topological role in frugivore-plant interaction networks. For one year in two localities with remnant patches of Colombian tropical dry forest, we sampled abundance, morphology, behaviour and fruit consumption from fleshy-fruited plants of various frugivore species. We assessed the network topological role of each frugivore species by integrating their degree of generalization in interactions with plants with their contributions to network nestedness and modularity. We estimated the potential contribution of each frugivore species to community-wide seed dispersal, on the basis of a set of frugivore ecological, morphological and behavioural characteristics important for seed dispersal, together with frugivore abundance and frugivory degree. The various frugivore species showed strong differences in their network structural roles, with generalist species contributing the most to network modularity and nestedness. Frugivores also showed strong variability in terms of potential contribution to seed dispersal, depending on the specific combinations of frugivore abundance, frugivory degree and the different traits and behaviours. For both localities, the seed dispersal potential of a frugivore species responded positively to its contribution to network structure, evidencing that the most important frugivore species in the network topology were also those making the strongest contribution as seed dispersers. Contribution to network structure was correlated with frugivore abundance, diet and behavioural characteristics. This suggests that the species-level link between structure and function is due to the fact that the occurrence of frugivore-plant interactions depends largely on the characteristics of the frugivore involved, which also condition its ultimate role in seed dispersal.
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Affiliation(s)
- Juan Fernando Acevedo-Quintero
- Departamento de Ciencias Forestales, Facultad de Ciencias Agrarias, Universidad Nacional de Colombia, Medellín, Colombia
| | - Joan Gastón Zamora-Abrego
- Departamento de Ciencias Forestales, Facultad de Ciencias Agrarias, Universidad Nacional de Colombia, Medellín, Colombia
| | - Daniel García
- Departmento de Biología de Organismos y Sistemas, Unidad Mixta de Investigación en Biodiversidad (CSIC-Uo-PA), Universidad de Oviedo, Oviedo, Spain
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30
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Li HD, Tang L, Jia C, Holyoak M, Fründ J, Huang X, Xiao Z. The functional roles of species in metacommunities, as revealed by metanetwork analyses of bird-plant frugivory networks. Ecol Lett 2020; 23:1252-1262. [PMID: 32436358 DOI: 10.1111/ele.13529] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 03/30/2020] [Accepted: 04/09/2020] [Indexed: 01/12/2023]
Abstract
Understanding how biodiversity and interaction networks change across environmental gradients is a major challenge in ecology. We integrated metacommunity and metanetwork perspectives to test species' functional roles in bird-plant frugivory interactions in a fragmented forest landscape in Southwest China, with consequences for seed dispersal. Availability of fruit resources both on and under trees created vertical feeding stratification for frugivorous birds. Bird-plant interactions involving birds feeding only on-the-tree or both on and under-the-tree (shared) had a higher centrality and contributed more to metanetwork organisation than interactions involving birds feeding only under-the-tree. Moreover, bird-plant interactions associated with large-seeded plants disproportionately contributed to metanetwork organisation and centrality. Consequently, on-the-tree and shared birds contributed more to metanetwork organisation whereas under-the-tree birds were more involved in local processes. We would expect that species' roles in the metanetwork will translate into different conservation values for maintaining functioning of seed-dispersal networks.
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Affiliation(s)
- Hai-Dong Li
- State Key Laboratory of Integrated Management of Pest Insects and Rodents in Agriculture, Institute of Zoology, Chinese Academy of Sciences, 1 Beichen West Road, Chaoyang District, Beijing, 100101, China.,University of Chinese Academy of Sciences, Beijing, 10049, China
| | - Linfang Tang
- State Key Laboratory of Integrated Management of Pest Insects and Rodents in Agriculture, Institute of Zoology, Chinese Academy of Sciences, 1 Beichen West Road, Chaoyang District, Beijing, 100101, China.,Key Laboratory of Zoological Systematics and Evolution, Chinese Academy of Sciences, 1 Beichen West Road, Chaoyang District, Beijing, 100101, China
| | - Chenxi Jia
- State Key Laboratory of Integrated Management of Pest Insects and Rodents in Agriculture, Institute of Zoology, Chinese Academy of Sciences, 1 Beichen West Road, Chaoyang District, Beijing, 100101, China.,Key Laboratory of Zoological Systematics and Evolution, Chinese Academy of Sciences, 1 Beichen West Road, Chaoyang District, Beijing, 100101, China
| | - Marcel Holyoak
- Department of Environmental Science and Policy, University of California, 1 Shields Ave, Davis, CA, 95616, USA
| | - Jochen Fründ
- Biometry and Environmental System Analysis, University of Freiburg, Tennenbacherstr. 4, 79106, Freiburg, Germany
| | - Xiaoqun Huang
- State Key Laboratory of Integrated Management of Pest Insects and Rodents in Agriculture, Institute of Zoology, Chinese Academy of Sciences, 1 Beichen West Road, Chaoyang District, Beijing, 100101, China
| | - Zhishu Xiao
- State Key Laboratory of Integrated Management of Pest Insects and Rodents in Agriculture, Institute of Zoology, Chinese Academy of Sciences, 1 Beichen West Road, Chaoyang District, Beijing, 100101, China.,University of Chinese Academy of Sciences, Beijing, 10049, China
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31
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Monthly Abundance Patterns and the Potential Role of Waterbirds as Phosphorus Sources to a Hypertrophic Baltic Lagoon. WATER 2020. [DOI: 10.3390/w12051392] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Compared to external loads from tributaries and sediment recycling, the role of waterbirds as phosphorus (P) sources in estuaries is overlooked. We performed monthly ship-based surveys of waterbird abundance in the Lithuanian part of the Curonian Lagoon, calculated their potential P excretion, and compared its relevance to the riverine inputs. Phosphorus excretion rates for the censused species were assessed accounting for variations of body weights, daily feces production and their P content, and assigning species to different feeding and nutrient cycling guilds. During the study period (March–November 2018), 32 waterbird species were censused, varying in abundance from ~18,000–32,000 (October–November) to ~30,000–48,000 individuals (June–September). The estimated avian P loads during the whole study period varied between 3.6 and 25 tons, corresponding to an area load between 8.7 and 60.7 mg P m−2. Waterbird release of reactive P to the system represented a variable but not negligible fraction (1%–12%) of total external P loads, peaking in June–September and coinciding with cyanobacterial blooms. This study is the first in the Baltic Sea region suggesting that waterbirds are potentially important P sources to phytoplankton in large estuaries, in particular, during low discharge periods.
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32
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Valenta K, Nevo O. The dispersal syndrome hypothesis: How animals shaped fruit traits, and how they did not. Funct Ecol 2020. [DOI: 10.1111/1365-2435.13564] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Kim Valenta
- Department of Anthropology University of Florida Gainesville FL USA
| | - Omer Nevo
- Institute of Evolutionary Ecology and Conservation Genomics Ulm University Ulm Germany
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33
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Antoniazzi R, García‐Franco J, Janda M, Leponce M, Dáttilo W. Diurnal foraging ant–tree co‐occurrence networks are similar between canopy and understorey in a Neotropical rain forest. Biotropica 2020. [DOI: 10.1111/btp.12773] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | | | - Milan Janda
- Laboratorio Nacional de Análisis y Síntesis Ecológica Escuela Nacional de Estudios Superiores Universidad Nacional Autónoma de México Morelia México
| | - Maurice Leponce
- Biodiversity Monitoring & Assessment Royal Belgian Institute of Natural Sciences Brussels Belgium
- Evolutionary Biology & Ecology Université Libre de Bruxelles Brussels Belgium
| | - Wesley Dáttilo
- Red de Ecoetología Instituto de Ecología A.C. Xalapa México
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34
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Stephens RB, Rowe RJ. The underappreciated role of rodent generalists in fungal spore dispersal networks. Ecology 2020; 101:e02972. [PMID: 31943145 DOI: 10.1002/ecy.2972] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/09/2019] [Accepted: 11/26/2019] [Indexed: 11/12/2022]
Abstract
Animals are often the primary dispersers of seeds and fungal spores. Specialist species that consume fruits or fungal fruiting bodies (sporocarps) as their main food source are thought to play a more important role in dispersal networks compared to generalist species. However, dispersal networks are often based on occurrence data, overlooking the influence of animal abundance and dispersal effectiveness on network interactions. Using rodent-mycorrhizal fungi networks, we determined how diet specialization and abundance influence the role of rodent species in dispersing fungal spores in temperate forests of northern New Hampshire, USA. We tracked the interactions of five rodent species and 34 fungal taxa over a 3-yr period across hardwood, mixed, and softwood forest stands. We accounted for fluctuations in rodent abundance and differences in the number of spores dispersed in rodent scat. Myodes gapperi, a fungal specialist, dispersed a more diverse spore community than rodent generalists and was consistently the most important disperser in forest types with high fungal availability. Nevertheless, during years when generalist species such as Tamias striatus and Peromyscus maniculatus reached high abundance, their relative importance (species strength) in networks approached or even surpassed that of M. gapperi, particularly in forest types where M. gapperi was less common and fungal availability was low. Increased numbers of generalists enhanced network interaction diversity and the number of fungal taxa dispersed, the timing of which was coincident with seedling establishment following masting, a stage when inoculation by mycorrhizal fungi is critical for growth and survival. Our findings suggest that although specialists play key roles in dispersing mycorrhizal fungal spores, generalists play a heretofore underappreciated role.
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Affiliation(s)
- Ryan B Stephens
- Natural Resources and the Environment, University of New Hampshire, 114 James Hall, 56 College Road, Durham, New Hampshire, 03824, USA
| | - Rebecca J Rowe
- Natural Resources and the Environment, University of New Hampshire, 114 James Hall, 56 College Road, Durham, New Hampshire, 03824, USA
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35
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Projected impacts of climate change on functional diversity of frugivorous birds along a tropical elevational gradient. Sci Rep 2019; 9:17708. [PMID: 31776351 PMCID: PMC6881284 DOI: 10.1038/s41598-019-53409-6] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2018] [Accepted: 10/26/2019] [Indexed: 11/09/2022] Open
Abstract
Climate change forces many species to move their ranges to higher latitudes or elevations. Resulting immigration or emigration of species might lead to functional changes, e.g., in the trait distribution and composition of ecological assemblages. Here, we combined approaches from biogeography (species distribution models; SDMs) and community ecology (functional diversity) to investigate potential effects of climate-driven range changes on frugivorous bird assemblages along a 3000 m elevational gradient in the tropical Andes. We used SDMs to model current and projected future occurrence probabilities of frugivorous bird species from the lowlands to the tree line. SDM-derived probabilities of occurrence were combined with traits relevant for seed dispersal of fleshy-fruited plants to calculate functional dispersion (FDis; a measure of functional diversity) for current and future bird assemblages. Comparisons of FDis between current and projected future assemblages showed consistent results across four dispersal scenarios, five climate models and two representative concentration pathways. Projections indicated a decrease of FDis in the lowlands, an increase of FDis at lower mid-elevations and little changes at high elevations. This suggests that functional dispersion responds differently to global warming at different elevational levels, likely modifying avian seed dispersal functions and plant regeneration in forest ecosystems along tropical mountains.
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36
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The danger of non-native gardens: risk of invasion by Schefflera arboricola associated with seed dispersal by birds. Biol Invasions 2019. [DOI: 10.1007/s10530-019-02139-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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37
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Preston DL, Falke LP, Henderson JS, Novak M. Food-web interaction strength distributions are conserved by greater variation between than within predator-prey pairs. Ecology 2019; 100:e02816. [PMID: 31287561 DOI: 10.1002/ecy.2816] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/11/2018] [Revised: 04/10/2019] [Accepted: 06/10/2019] [Indexed: 12/25/2022]
Abstract
Species interactions in food webs are usually recognized as dynamic, varying across species, space, and time because of biotic and abiotic drivers. Yet food webs also show emergent properties that appear consistent, such as a skewed frequency distribution of interaction strengths (many weak, few strong). Reconciling these two properties requires an understanding of the variation in pairwise interaction strengths and its underlying mechanisms. We estimated stream sculpin feeding rates in three seasons at nine sites in Oregon to examine variation in trophic interaction strengths both across and within predator-prey pairs. Predator and prey densities, prey body mass, and abiotic factors were considered as putative drivers of within-pair variation over space and time. We hypothesized that consistently skewed interaction strength distributions could result if individual interaction strengths show relatively little variation, or alternatively, if interaction strengths vary but shift in ways that conserve their overall frequency distribution. Feeding rate distributions remained consistently and positively skewed across all sites and seasons. The mean coefficient of variation in feeding rates within each of 25 focal species pairs across surveys was less than half the mean coefficient of variation seen across species pairs within a survey. The rank order of feeding rates also remained conserved across streams, seasons and individual surveys. On average, feeding rates on each prey taxon nonetheless varied by a hundredfold, with some feeding rates showing more variation in space and others in time. In general, feeding rates increased with prey density and decreased with high stream flows and low water temperatures, although for nearly half of all species pairs, factors other than prey density explained the most variation. Our findings show that although individual interaction strengths exhibit considerable variation in space and time, they can nonetheless remain relatively consistent, and thus predictable, compared to the even larger variation that occurs across species pairs. These results highlight how the ecological scale of inference can strongly shape conclusions about interaction strength consistency and help reconcile how the skewed nature of interaction strength distributions can persist in highly dynamic food webs.
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Affiliation(s)
- Daniel L Preston
- Department of Forest and Wildlife Ecology, University of Wisconsin-Madison, Madison, Wisconsin, 53706, USA
| | - Landon P Falke
- Department of Forest and Wildlife Ecology, University of Wisconsin-Madison, Madison, Wisconsin, 53706, USA
| | - Jeremy S Henderson
- Oregon Department of Fish and Wildlife, 305 North Canyon Boulevard, Canyon City, Oregon, 97820, USA
| | - Mark Novak
- Department of Integrative Biology, Oregon State University, Corvallis, Oregon, 97330, USA
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38
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How do fruit productivity, fruit traits and dietary specialization affect the role of birds in a mutualistic network? JOURNAL OF TROPICAL ECOLOGY 2019. [DOI: 10.1017/s0266467419000178] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
AbstractMany plant traits might explain the different ecological and network roles of fruit-eating birds. We assessed the relationship of plant productivity, fruit traits (colour, seed size and nutritional quality) and dietary specialization, with the network roles of fruit-eating birds (number of partners, centrality and selectivity) in the Atlantic Forest, Brazil. We classified bird species according to their dietary specialization into three categories: obligate, partial and opportunistic fruit-eating birds. To test if network roles changed according to dietary specialization, fruit productivity and traits, we used a generalized linear model analysis. The selected 14 species of plant interacted with 52 bird species, which consumed 2199 fruits. The most central and generalist fruit-eating bird, Turdus albicolis, interacted with plants that produced more fruits, such as Miconia cinerascens, and had, on average, larger seeds, such as Myrcia splendens. The most selective birds interacted with fruits with a higher concentration of lipids and less intense colour, and plants that produced fewer fruits. Obligate fruit-eating birds, such as Patagioenas plumbea, were more selective than partial and opportunistic birds. Different plant traits are therefore related to the different network roles of fruit-eating birds in the Atlantic Forest, which are also dependent on bird dietary specialization.
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39
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Carlson CJ, Zipfel CM, Garnier R, Bansal S. Global estimates of mammalian viral diversity accounting for host sharing. Nat Ecol Evol 2019; 3:1070-1075. [PMID: 31182813 DOI: 10.1038/s41559-019-0910-6] [Citation(s) in RCA: 66] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Accepted: 04/23/2019] [Indexed: 11/09/2022]
Abstract
Present estimates suggest there are over 1 million virus species found in mammals alone, with about half a million posing a possible threat to human health. Although previous estimates assume linear scaling between host and virus diversity, we show that ecological network theory predicts a non-linear relationship, produced by patterns of host sharing among virus species. To account for host sharing, we fit a power law scaling relationship for host-virus species interaction networks. We estimate that there are about 40,000 virus species in mammals (including ~10,000 viruses with zoonotic potential), a reduction of two orders of magnitude from present projections of viral diversity. We expect that the increasing availability of host-virus association data will improve the precision of these estimates and their use in the sampling and surveillance of pathogens with pandemic potential. We suggest host sharing should be more widely included in macroecological approaches to estimating biodiversity.
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Affiliation(s)
- Colin J Carlson
- Department of Biology, Georgetown University, Washington, DC, USA.
| | - Casey M Zipfel
- Department of Biology, Georgetown University, Washington, DC, USA
| | - Romain Garnier
- Department of Biology, Georgetown University, Washington, DC, USA
| | - Shweta Bansal
- Department of Biology, Georgetown University, Washington, DC, USA
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40
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Naniwadekar R, Chaplod S, Datta A, Rathore A, Sridhar H. Large frugivores matter: Insights from network and seed dispersal effectiveness approaches. J Anim Ecol 2019; 88:1250-1262. [PMID: 31063251 DOI: 10.1111/1365-2656.13005] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2019] [Accepted: 03/27/2019] [Indexed: 11/29/2022]
Abstract
While large avian frugivores are known to be key dispersers for large-seeded tree species, their role in community-wide plant-disperser networks is still poorly known. Large avian frugivores are also among the most threatened due to anthropogenic impacts. We evaluated the role of large avian frugivores in a plant-disperser community by (a) determining whether the plant-disperser community was modular, with a distinct community of large frugivores (thereby highlighting their importance), (b) determining relative qualitative and quantitative roles played by large-bodied frugivores vis-à-vis other frugivores and (c) determining impacts of large-bodied frugivore loss on the plant-disperser community. The study was carried out at a tropical forest site in north-east India, which is part of the Eastern Himalaya Biodiversity Hotspot. We collected tree watch data (20:55 hr) from 46 tree species, which represented 85% of tree species that are predominantly bird-dispersed in the area. We found that the plant-disperser community was modular, with a distinct module of large-seeded tree species and large frugivores. Intermediate-sized frugivores such as barbets and bulbuls were the most connected, while large-sized frugivores, such as hornbills and imperial pigeons, were moderately well connected. Qualitative and quantitative roles played by different dispersers varied across the gradient of frugivore body size. Hornbills, the largest avian frugivores, consumed a significantly greater number of fruits and swallowed larger proportions of fruits compared with other avian groups. In comparison with similar-sized frugivores, imperial pigeons fed on larger-sized fruits, highlighting their importance for dispersal of large-seeded plants. Under simulated extinction scenarios, larger extinction cascades were not necessarily caused by larger frugivores; however, extinctions of certain large-bodied frugivores (hornbills, imperial pigeons) caused extinction cascades. Integrating information from networks and seed dispersal effectiveness approaches enabled a better understanding of large frugivore role in a plant-disperser community. While large-bodied frugivores may not be playing a central role in plant-disperser communities, they are crucial as seed dispersal service providers for large-seeded plants. In conjunction with the reported local extinctions of large frugivores like hornbills from the south Asian region, this study's findings highlight the irreplaceable quantitative and qualitative impacts that tropical plant communities are likely to experience in the future.
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Affiliation(s)
| | | | | | - Akanksha Rathore
- Centre for Ecological Sciences, Indian Institute of Science, Bengaluru, India
| | - Hari Sridhar
- Centre for Ecological Sciences, Indian Institute of Science, Bengaluru, India
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41
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Vizentin-Bugoni J, Tarwater CE, Foster JT, Drake DR, Gleditsch JM, Hruska AM, Kelley JP, Sperry JH. Structure, spatial dynamics, and stability of novel seed dispersal mutualistic networks in Hawaiʻi. Science 2019; 364:78-82. [DOI: 10.1126/science.aau8751] [Citation(s) in RCA: 60] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2018] [Revised: 11/29/2018] [Accepted: 03/05/2019] [Indexed: 11/02/2022]
Abstract
Increasing rates of human-caused species invasions and extinctions may reshape communities and modify the structure, dynamics, and stability of species interactions. To investigate how such changes affect communities, we performed multiscale analyses of seed dispersal networks on Oʻahu, Hawaiʻi. Networks consisted exclusively of novel interactions, were largely dominated by introduced species, and exhibited specialized and modular structure at local and regional scales, despite high interaction dissimilarity across communities. Furthermore, the structure and stability of the novel networks were similar to native-dominated communities worldwide. Our findings suggest that shared evolutionary history is not a necessary process for the emergence of complex network structure, and interaction patterns may be highly conserved, regardless of species identity and environment. Introduced species can quickly become well integrated into novel networks, making restoration of native ecosystems more challenging than previously thought.
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42
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Crestani A, Mello M, Cazetta E. Interindividual variations in plant and fruit traits affect the structure of a plant-frugivore network. ACTA OECOLOGICA-INTERNATIONAL JOURNAL OF ECOLOGY 2019. [DOI: 10.1016/j.actao.2018.11.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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43
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Machado-de-Souza T, Campos RP, Devoto M, Varassin IG. Local drivers of the structure of a tropical bird-seed dispersal network. Oecologia 2019; 189:421-433. [PMID: 30612225 DOI: 10.1007/s00442-018-4322-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Accepted: 12/08/2018] [Indexed: 10/27/2022]
Abstract
One of the major challenges in ecology is to understand the relative importance of neutral- and niche-based processes structuring species interactions within communities. The concept of neutral-based processes posits that network structure is a result of interactions between species based on their abundance. On the other hand, niche-based processes presume that network structure is shaped by constraints to interactions. Here, we evaluated the relative importance of neutral-based process, represented by species' abundance (A) and fruit production (F) models, and niche-based process, represented by spatial overlap (S), temporal overlap (T) and morphological barrier (M) models, in shaping the structure of a bird-seed dispersal network from the Brazilian Atlantic Forest. We evaluated the ability of each model, singly or in combination, to predict the general structure [represented by connectance, nestedness (NODF), weight nestedness (WNODF), interaction evenness and complementary specialization] and microstructure of the network (i.e., the frequency of pairwise interactions). Only nestedness (both NODF and WNODF) was predicted by at least one model. NODF and WNODF were predicted by a neutral-based process (A), by a combination of niche-based processes (ST and STM) and by both neutral- and niche-based processes (AM). NODF was also predicted by F and FM model. Regarding microstructure, temporal overlap (T) was the most parsimonious model able to predict it. Our findings reveal that a combination of neutral- and niche-based processes is a good predictor of the general structure (NODF and WNODF) of the bird-seed dispersal network and a niche-based process is the best predictor of the network's microstructure.
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Affiliation(s)
- Tiago Machado-de-Souza
- Laboratório de Interações e Biologia Reprodutiva, Departamento de Botânica, Universidade Federal do Paraná, Centro Politécnico, Jardim das Américas, Curitiba, PR, 81531-990, Brazil. .,Programa de Pós-Graduação em Ecologia e Conservação, Universidade Federal do Paraná, Centro Politécnico, Jardim das Américas, Curitiba, PR, 81531-990, Brazil. .,Mater Natura-Instituto de Estudos Ambientais, Rua Lamenha Lins 1080, Curitiba, PR, 80250-020, Brazil. .,Instituto de Estudos Ambientais do Paraná (IEAP), Rua Rômulo Gutierrez 731, Curitiba, PR, 80820-260, Brazil.
| | - Ricardo Pamplona Campos
- Laboratório de Interações e Biologia Reprodutiva, Departamento de Botânica, Universidade Federal do Paraná, Centro Politécnico, Jardim das Américas, Curitiba, PR, 81531-990, Brazil
| | - Mariano Devoto
- Facultad de Agronomía, Cátedra de Botánica General, Universidad de Buenos Aires, Avda. San Martín 4453, C1417DSE, Buenos Aires, Argentina.,Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
| | - Isabela Galarda Varassin
- Laboratório de Interações e Biologia Reprodutiva, Departamento de Botânica, Universidade Federal do Paraná, Centro Politécnico, Jardim das Américas, Curitiba, PR, 81531-990, Brazil.,Programa de Pós-Graduação em Ecologia e Conservação, Universidade Federal do Paraná, Centro Politécnico, Jardim das Américas, Curitiba, PR, 81531-990, Brazil
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44
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Li N, Wang Z, Zhang S, Yan C, Li X, Lu C. Importance of bird traits for seed dispersal patterns of co-fruiting trees in a patchy forest. Integr Zool 2018; 14:470-478. [PMID: 30585442 DOI: 10.1111/1749-4877.12374] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Habitat fragmentation is globally one of the most important drivers of change in biodiversity. Seed dispersal by birds is crucial for tree regeneration in remnant patchy forests, yet how bird traits affect seed dispersal pattern is still poorly understood. We studied the extent to which bird traits affect seed-removal networks and whether these traits affect seed deposition and seedling recruitment for 3 co-fruiting tree species (Taxus chinensis, Cinnamomum bodinieri and Machilus thunbergii) in a patchy forest. A total of 17, 18 and 10 bird species were recorded foraging for seeds of T. chinensis, M. thunbergii and C. bodinieri, respectively. Frequency of bird visitation increased with tail length, wing length and body length. Furthermore, bird body length, bill length, body weight and wing length were important in the strength of the seed removal network. During foraging, 6 bird species exhibited different patterns of microhabitat utilization and their perching frequency increased with bird weight and tarsus length. As a consequence, frequency of habitat use, bird length and tarsus length were important in determining the number of deposited seeds. For seedling recruitment, seedling number increased with bird tarsus length and weight, but decreased with wing length. Overall, our results showed that various bird traits not only affected seed removal, but also influenced the subsequent processes of seed deposition and seedling distribution in a patchy forest. These results thus highlight the importance of large-bodied birds for plant recruitment and point out the need to prioritize the protection and conservation of these birds in remnant patchy forests.
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Affiliation(s)
- Ning Li
- Institute of Applied Ecology, Nanjing Xiaozhuang University, Nanjing, Jiangsu, China
| | - Zheng Wang
- College of Biology and Environmental Science, Nanjing Forestry University, Nanjing, China
| | - Shuai Zhang
- College of Biology and Environmental Science, Nanjing Forestry University, Nanjing, China
| | - Chuan Yan
- Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Xinhai Li
- Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Changhu Lu
- College of Biology and Environmental Science, Nanjing Forestry University, Nanjing, China
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45
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Quitián M, Santillán V, Bender IMA, Espinosa CI, Homeier J, Böhning‐Gaese K, Schleuning M, Lena Neuschulz E. Functional responses of avian frugivores to variation in fruit resources between natural and fragmented forests. Funct Ecol 2018. [DOI: 10.1111/1365-2435.13255] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Marta Quitián
- Senckenberg Biodiversity and Climate Research Centre Frankfurt (SBiK-F) Frankfurt am Main Germany
- Departament of Biological SciencesGoethe University Frankfurt Frankfurt am Main Germany
| | - Vinicio Santillán
- Senckenberg Biodiversity and Climate Research Centre Frankfurt (SBiK-F) Frankfurt am Main Germany
- Departament of Biological SciencesGoethe University Frankfurt Frankfurt am Main Germany
| | - Irene M. A. Bender
- Senckenberg Biodiversity and Climate Research Centre Frankfurt (SBiK-F) Frankfurt am Main Germany
- German Centre for Integrative Biodiversity Research (iDiv) Halle‐Jena‐Leipzig Leipzig Germany
- Institute of Biology, Geobotany and Botanical GardenMartin Luther University Halle‐Wittenberg Halle Germany
| | | | - Jürgen Homeier
- Albrecht von Haller Institute of Plant SciencesUniversity of Goettingen Goettingen Germany
| | - Katrin Böhning‐Gaese
- Senckenberg Biodiversity and Climate Research Centre Frankfurt (SBiK-F) Frankfurt am Main Germany
- Departament of Biological SciencesGoethe University Frankfurt Frankfurt am Main Germany
| | - Matthias Schleuning
- Senckenberg Biodiversity and Climate Research Centre Frankfurt (SBiK-F) Frankfurt am Main Germany
| | - Eike Lena Neuschulz
- Senckenberg Biodiversity and Climate Research Centre Frankfurt (SBiK-F) Frankfurt am Main Germany
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Gómez JM, Schupp EW, Jordano P. Synzoochory: the ecological and evolutionary relevance of a dual interaction. Biol Rev Camb Philos Soc 2018; 94:874-902. [PMID: 30467946 DOI: 10.1111/brv.12481] [Citation(s) in RCA: 62] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Revised: 10/22/2018] [Accepted: 10/24/2018] [Indexed: 12/31/2022]
Affiliation(s)
- José María Gómez
- Departamento de Ecología Funcional y Evolutiva, Estación Experimental de Zonas Áridas (EEZA-CSIC), Ctra Sacramento s/n, La Cañada de San Urbano, E-04120 Almería, Spain
| | - Eugene W Schupp
- Department of Wildland Resources and Ecology Center, S. J. and Jesse E. Quinney College of Natural Resources, 5230 Old Main Hill, Utah State University, Logan, UT 84322-5230,, U.S.A
| | - Pedro Jordano
- Departamento de Ecología Integrativa, Integrative Ecology Group, Estación Biológica de Doñana (EBD-CSIC), Avda. Americo Vespucio S/N, E-41092 Sevilla, Spain
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Navarro AB, Bovo AAA, Alexandrino ER, Oliveira VC, Pizo MA, Ferraz KMPMB. Fruit availability at the individual and local levels influences fruit removal in Cecropia pachystachya. BRAZ J BIOL 2018; 79:758-759. [PMID: 30427384 DOI: 10.1590/1519-6984.198339] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Accepted: 08/10/2018] [Indexed: 11/21/2022] Open
Affiliation(s)
- A B Navarro
- Laboratório de Ecologia, Manejo e Conservação de Fauna Silvestre - LEMaC, Escola Superior de Agricultura "Luiz de Queiroz" - ESALQ, Universidade de São Paulo - USP, Av. Pádua Dias, 11, CEP 13418-900, Piracicaba, SP, Brasil
| | - A A A Bovo
- Laboratório de Ecologia, Manejo e Conservação de Fauna Silvestre - LEMaC, Escola Superior de Agricultura "Luiz de Queiroz" - ESALQ, Universidade de São Paulo - USP, Av. Pádua Dias, 11, CEP 13418-900, Piracicaba, SP, Brasil
| | - E R Alexandrino
- Laboratório de Ecologia, Manejo e Conservação de Fauna Silvestre - LEMaC, Escola Superior de Agricultura "Luiz de Queiroz" - ESALQ, Universidade de São Paulo - USP, Av. Pádua Dias, 11, CEP 13418-900, Piracicaba, SP, Brasil
| | - V C Oliveira
- Laboratório de Ecologia, Manejo e Conservação de Fauna Silvestre - LEMaC, Escola Superior de Agricultura "Luiz de Queiroz" - ESALQ, Universidade de São Paulo - USP, Av. Pádua Dias, 11, CEP 13418-900, Piracicaba, SP, Brasil
| | - M A Pizo
- Departamento de Zoologia, Instituto de Biociências, Universidade Estadual Paulista "Júlio de Mesquita Filho" - UNESP, Av. 24-A, 1515, CEP 13506-900, Rio Claro, SP, Brasil
| | - K M P M B Ferraz
- Laboratório de Ecologia, Manejo e Conservação de Fauna Silvestre - LEMaC, Escola Superior de Agricultura "Luiz de Queiroz" - ESALQ, Universidade de São Paulo - USP, Av. Pádua Dias, 11, CEP 13418-900, Piracicaba, SP, Brasil
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Albrecht J, Classen A, Vollstädt MGR, Mayr A, Mollel NP, Schellenberger Costa D, Dulle HI, Fischer M, Hemp A, Howell KM, Kleyer M, Nauss T, Peters MK, Tschapka M, Steffan-Dewenter I, Böhning-Gaese K, Schleuning M. Plant and animal functional diversity drive mutualistic network assembly across an elevational gradient. Nat Commun 2018; 9:3177. [PMID: 30093613 PMCID: PMC6085337 DOI: 10.1038/s41467-018-05610-w] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Accepted: 07/17/2018] [Indexed: 12/05/2022] Open
Abstract
Species’ functional traits set the blueprint for pair-wise interactions in ecological networks. Yet, it is unknown to what extent the functional diversity of plant and animal communities controls network assembly along environmental gradients in real-world ecosystems. Here we address this question with a unique dataset of mutualistic bird–fruit, bird–flower and insect–flower interaction networks and associated functional traits of 200 plant and 282 animal species sampled along broad climate and land-use gradients on Mt. Kilimanjaro. We show that plant functional diversity is mainly limited by precipitation, while animal functional diversity is primarily limited by temperature. Furthermore, shifts in plant and animal functional diversity along the elevational gradient control the niche breadth and partitioning of the respective other trophic level. These findings reveal that climatic constraints on the functional diversity of either plants or animals determine the relative importance of bottom-up and top-down control in plant–animal interaction networks. Differential responses of plant and animal functional diversity to climatic variation could affect trait matching in mutualistic interactions. Here, Albrecht et al. show that network structure varies across an elevational gradient owing to bottom-up and top-down effects of functional diversity.
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Affiliation(s)
- Jörg Albrecht
- Senckenberg Biodiversity and Climate Research Centre (BiK-F), Senckenberganlage 25, 60325, Frankfurt am Main, Germany.
| | - Alice Classen
- Department of Animal Ecology and Tropical Biology, Biocenter, University of Würzburg, 97074, Am Hubland, Würzburg, Germany
| | - Maximilian G R Vollstädt
- Senckenberg Biodiversity and Climate Research Centre (BiK-F), Senckenberganlage 25, 60325, Frankfurt am Main, Germany
| | - Antonia Mayr
- Department of Animal Ecology and Tropical Biology, Biocenter, University of Würzburg, 97074, Am Hubland, Würzburg, Germany
| | - Neduvoto P Mollel
- Institute of Plant Sciences, University of Bern, Altenbergrain 21, Bern, 3013, Switzerland.,Tropical Pesticides Research Institute (TPRI), Arusha, Tanzania
| | - David Schellenberger Costa
- Landscape Ecology Group, Institute of Biology and Environmental Sciences, University of Oldenburg, Carl von Ossietzky Straße 9-11, 26129, Oldenburg, Germany.,Institute of Ecology and Evolution, Friedrich Schiller University Jena, Dornburger Strasse 159, 07743, Jena, Germany
| | - Hamadi I Dulle
- Senckenberg Biodiversity and Climate Research Centre (BiK-F), Senckenberganlage 25, 60325, Frankfurt am Main, Germany
| | - Markus Fischer
- Senckenberg Biodiversity and Climate Research Centre (BiK-F), Senckenberganlage 25, 60325, Frankfurt am Main, Germany.,Institute of Plant Sciences, University of Bern, Altenbergrain 21, Bern, 3013, Switzerland
| | - Andreas Hemp
- Department of Plant Systematics, University of Bayreuth, Universitätsstraße 30, 95440, Bayreuth, Germany
| | - Kim M Howell
- Department of Zoology and Wildlife Conservation, University of Dar-es-Salaam, Dar-es-Salaam, Tanzania
| | - Michael Kleyer
- Landscape Ecology Group, Institute of Biology and Environmental Sciences, University of Oldenburg, Carl von Ossietzky Straße 9-11, 26129, Oldenburg, Germany
| | - Thomas Nauss
- Environmental Informatics, Faculty of Geography, University of Marburg, Deutschhausstraße 12, 35032, Marburg, Germany
| | - Marcell K Peters
- Department of Animal Ecology and Tropical Biology, Biocenter, University of Würzburg, 97074, Am Hubland, Würzburg, Germany
| | - Marco Tschapka
- Institute for Evolutionary Ecology and Conservation Genomics, University of Ulm, Albert- Einstein-Allee 11, 89069, Ulm, Germany.,Smithsonian Tropical Research Institute, PO Box 0843-03092, Balboa Ancòn, Republic of Panama
| | - Ingolf Steffan-Dewenter
- Department of Animal Ecology and Tropical Biology, Biocenter, University of Würzburg, 97074, Am Hubland, Würzburg, Germany
| | - Katrin Böhning-Gaese
- Senckenberg Biodiversity and Climate Research Centre (BiK-F), Senckenberganlage 25, 60325, Frankfurt am Main, Germany.,Institute for Ecology, Evolution and Diversity, Goethe University Frankfurt, Biologicum, Max-von-Laue-Straße 13, 60439, Frankfurt am Main, Germany
| | - Matthias Schleuning
- Senckenberg Biodiversity and Climate Research Centre (BiK-F), Senckenberganlage 25, 60325, Frankfurt am Main, Germany
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