1
|
Eyer PA, Finand B, Mona S, Khimoun A, D'ettorre P, Fédérici P, Leroy C, Cornette R, Chifflet-Belle P, Monnin T, Doums C. Integrative characterization of genetic and phenotypic differentiation in an ant species complex with strong hierarchical population structure and low dispersal abilities. Heredity (Edinb) 2023; 130:163-176. [PMID: 36585503 PMCID: PMC9981590 DOI: 10.1038/s41437-022-00590-6] [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: 12/07/2021] [Revised: 12/21/2022] [Accepted: 12/21/2022] [Indexed: 12/31/2022] Open
Abstract
Low dispersal, occurrence of asexual reproduction and geographic discontinuity increase genetic differentiation between populations, which ultimately can lead to speciation. In this work, we used a multidisciplinary framework to characterize the genetic and phenotypic differentiation between and within two cryptic ant species with restricted dispersal, Cataglyphis cursor and C. piliscapa and used behavioral experiments to test for reproductive isolation. Their distribution is segregated by the Rhône River and they have been traditionally distinguished only by hair numbers, although a statistical assessment is still lacking. We found strong genetic (microsatellites, nuclear and mitochondrial sequences), morphological (number of hairs, tibia length, male genitalia) and chemical (cuticular hydrocarbons) differentiation not only between species but also among localities within species. However, inter-specific differentiation was slightly higher than intra-specific differentiation for most markers. Overall, this pattern could either reflect reproductive isolation or could result from a longer period of geographic isolation between species than among localities within species without necessarily involving reproductive isolation. Interestingly, our behavioral experiments showed an absence of mating between species associated to a higher aggressiveness of workers towards heterospecific males. This suggests that sexual selection may, at least partially, fuel reproductive isolation. We also showed that cuticular hydrocarbons, mtDNA sequences and number of hairs provide reliable criteria allowing species discrimination. Overall, this species complex offers a case study to further investigate varying stages of a speciation continuum by estimating reproductive isolation between pairs of localities varying by their level of genetic differentiation.
Collapse
Affiliation(s)
- P A Eyer
- Department of Entomology, 2143 TAMU, Texas A&M University, College Station, TX, 77843-2143, USA.
- Institut de Systématique, Évolution, Biodiversité (ISYEB), UMR 7205, MNHN, CNRS, EPHE-PSL, Sorbonne Université, Université des Antilles, 75005, Paris, France.
- EPHE, PSL University, 75005, Paris, France.
| | - B Finand
- Institut de Systématique, Évolution, Biodiversité (ISYEB), UMR 7205, MNHN, CNRS, EPHE-PSL, Sorbonne Université, Université des Antilles, 75005, Paris, France
| | - S Mona
- Institut de Systématique, Évolution, Biodiversité (ISYEB), UMR 7205, MNHN, CNRS, EPHE-PSL, Sorbonne Université, Université des Antilles, 75005, Paris, France
- EPHE, PSL University, 75005, Paris, France
| | - A Khimoun
- Institut de Systématique, Évolution, Biodiversité (ISYEB), UMR 7205, MNHN, CNRS, EPHE-PSL, Sorbonne Université, Université des Antilles, 75005, Paris, France
- EPHE, PSL University, 75005, Paris, France
- Biogéosciences, UMR 6282 CNRS, Université Bourgogne Franche-Comté, 6 Boulevard Gabriel, 21000, Dijon, France
| | - P D'ettorre
- Laboratory of Experimental and Comparative Ethology, University of Paris 13, Sorbonne Paris Cité, 93430, Villetaneuse, France
| | - P Fédérici
- Sorbonne Université, Université Paris Est Créteil, CNRS, INRAe, IRD, Institute of Ecology and Environmental sciences of Paris, iEES-Paris, 75005, Paris, France
| | - C Leroy
- Biogéosciences, UMR 6282 CNRS, Université Bourgogne Franche-Comté, 6 Boulevard Gabriel, 21000, Dijon, France
| | - R Cornette
- Institut de Systématique, Évolution, Biodiversité (ISYEB), UMR 7205, MNHN, CNRS, EPHE-PSL, Sorbonne Université, Université des Antilles, 75005, Paris, France
| | - P Chifflet-Belle
- Institut de Systématique, Évolution, Biodiversité (ISYEB), UMR 7205, MNHN, CNRS, EPHE-PSL, Sorbonne Université, Université des Antilles, 75005, Paris, France
- EPHE, PSL University, 75005, Paris, France
| | - T Monnin
- Sorbonne Université, Université Paris Est Créteil, CNRS, INRAe, IRD, Institute of Ecology and Environmental sciences of Paris, iEES-Paris, 75005, Paris, France
| | - C Doums
- Institut de Systématique, Évolution, Biodiversité (ISYEB), UMR 7205, MNHN, CNRS, EPHE-PSL, Sorbonne Université, Université des Antilles, 75005, Paris, France
- EPHE, PSL University, 75005, Paris, France
| |
Collapse
|
2
|
Cordonnier M, Escarguel G, Dumet A, Kaufmann B. Multiple mating in the context of interspecific hybridization between two Tetramorium ant species. Heredity (Edinb) 2020; 124:675-684. [PMID: 32205865 DOI: 10.1038/s41437-020-0310-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Revised: 02/29/2020] [Accepted: 03/11/2020] [Indexed: 12/24/2022] Open
Abstract
In eusocial Hymenoptera, haplodiploidy and polyandry may facilitate selection for hybridization. Interspecific hybridization is widespread in ants and can lead to hybrid inviability as well as the formation of new species through hybrid speciation. However, in ants, polyandry is uncommon. By analyzing microsatellite markers on 15 ant workers per colony, we show that the mating system of 28 pure colonies of Tetramorium immigrans, 15 pure colonies of Tetramorium caespitum, and 27 hybrid colonies is a monogyne/polyandrous mating system, with a higher mating rate in T. caespitum (mean = 2.4 males vs. 1.7 in T. immigrans). Hybrid queens, but no hybrid fathers, were deduced from workers' genotypes, in accordance with Haldane's rule extended to haplodiploid organisms, which states that the haploid sex should more often be sterile or inviable. In five colonies, hybridization and multiple mating allowed the simultaneous production of both hybrid and nonhybrid offspring. Although rare, these situations hinted at asymmetrical, larger contributions of T. immigrans vs. T. caespitum males to offspring production. Together, these findings point toward a complex and dynamic mating system in T. immigrans and T. caespitum, and contribute to better understand interspecific hybridization mechanisms and their consequences on genetic and taxonomic diversity. The study of polyandry within a hybrid zone is unprecedented and opens new opportunities to better understand interspecific hybridization mechanisms and their short- to long-term consequences.
Collapse
Affiliation(s)
- Marion Cordonnier
- Univ. Lyon, UMR5023 Ecologie des Hydrosystèmes Naturels et Anthropisés, ENTPE, CNRS, Université Lyon 1, Villeurbanne, F-69622, Lyon, France.
| | - Gilles Escarguel
- Univ. Lyon, UMR5023 Ecologie des Hydrosystèmes Naturels et Anthropisés, ENTPE, CNRS, Université Lyon 1, Villeurbanne, F-69622, Lyon, France
| | - Adeline Dumet
- Univ. Lyon, UMR5023 Ecologie des Hydrosystèmes Naturels et Anthropisés, ENTPE, CNRS, Université Lyon 1, Villeurbanne, F-69622, Lyon, France
| | - Bernard Kaufmann
- Univ. Lyon, UMR5023 Ecologie des Hydrosystèmes Naturels et Anthropisés, ENTPE, CNRS, Université Lyon 1, Villeurbanne, F-69622, Lyon, France
| |
Collapse
|
3
|
Avril A, Purcell J, Brelsford A, Chapuisat M. Asymmetric assortative mating and queen polyandry are linked to a supergene controlling ant social organization. Mol Ecol 2018; 28:1428-1438. [PMID: 30003603 DOI: 10.1111/mec.14793] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Revised: 07/02/2018] [Accepted: 07/06/2018] [Indexed: 01/04/2023]
Abstract
Nonrecombining genomic variants underlie spectacular social polymorphisms, from bird mating systems to ant social organization. Because these "social supergenes" affect multiple phenotypic traits linked to survival and reproduction, explaining their persistence remains a substantial challenge. Here, we investigate how large nonrecombining genomic variants relate to colony social organization, mating system and dispersal in the Alpine silver ant, Formica selysi. The species has colonies headed by a single queen (monogynous) and colonies headed by multiple queens (polygynous). We confirmed that a supergene with alternate haplotypes-Sm and Sp-underlies this polymorphism in social structure: Females from mature monogynous colonies had the Sm/Sm genotype, while those from polygynous colonies were Sm/Sp and Sp/Sp. Queens heading monogynous colonies were exclusively mated with Sm males. In contrast, queens heading polygynous colonies were mated with Sp males and Sm males. Sm males, which are only produced by monogynous colonies, accounted for 22.9% of the matings with queens from mature polygynous colonies. This asymmetry between social forms in the degree of assortative mating generates unidirectional male-mediated gene flow from the monogynous to the polygynous social form. Biased gene flow was confirmed by a significantly higher number of private alleles in the polygynous social form. Moreover, heterozygous queens were three times as likely as homozygous queens to be multiply mated. This study reveals that the supergene variants jointly affect social organization and multiple components of the mating system that alter the transmission of the variants and thus influence the dynamics of the system.
Collapse
Affiliation(s)
- Amaury Avril
- Department of Ecology and Evolution, University of Lausanne, Lausanne, Switzerland
| | - Jessica Purcell
- Department of Entomology, University of California Riverside, Riverside, California
| | - Alan Brelsford
- Department of Evolution, Ecology, and Organismal Biology, University of California Riverside, Riverside, California
| | - Michel Chapuisat
- Department of Ecology and Evolution, University of Lausanne, Lausanne, Switzerland
| |
Collapse
|
4
|
Peeters C, Aron S. Evolutionary reduction of female dispersal in Cataglyphis desert ants. Biol J Linn Soc Lond 2017. [DOI: 10.1093/biolinnean/blx052] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
|
5
|
Boulay R, Aron S, Cerdá X, Doums C, Graham P, Hefetz A, Monnin T. Social Life in Arid Environments: The Case Study of Cataglyphis Ants. ANNUAL REVIEW OF ENTOMOLOGY 2017; 62:305-321. [PMID: 27860520 DOI: 10.1146/annurev-ento-031616-034941] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Unlike most desert-dwelling animals, Cataglyphis ants do not attempt to escape the heat; rather, they apply their impressive heat tolerance to avoid competitors and predators. This thermally defined niche has promoted a range of adaptations both at the individual and colony levels. We have also recently discovered that within the genus Cataglyphis there are incredibly diverse social systems, modes of reproduction, and dispersal, prompting the tantalizing question of whether social diversity may also be a consequence of the harsh environment within which we find these charismatic ants. Here we review recent advances regarding the physiological, behavioral, life-history, colony, and ecological characteristics of Cataglyphis and consider perspectives on future research that will build our understanding of organic adaptive responses to desertification.
Collapse
Affiliation(s)
- Raphaël Boulay
- Le Studium Loire Valley Institute for Advanced Studies, 45000 Orléans, France;
- Institute of Insect Biology, Tours University, 37200 Tours, France
| | - Serge Aron
- Le Studium Loire Valley Institute for Advanced Studies, 45000 Orléans, France;
- Evolutionary Biology and Ecology, Université Libre de Bruxelles, 1050, Belgium
| | - Xim Cerdá
- Le Studium Loire Valley Institute for Advanced Studies, 45000 Orléans, France;
- Doñana Biological Station, CSIC, 41092 Seville, Spain
| | - Claudie Doums
- Le Studium Loire Valley Institute for Advanced Studies, 45000 Orléans, France;
- Institute of Systematics, Evolution, and Biodiversity, CNRS, UPMC, EPHE, MNHN, 75005 Paris, France
| | - Paul Graham
- Le Studium Loire Valley Institute for Advanced Studies, 45000 Orléans, France;
- School of Life Sciences, University of Sussex, Brighton, BN1 9QG, United Kingdom
| | - Abraham Hefetz
- Le Studium Loire Valley Institute for Advanced Studies, 45000 Orléans, France;
- Department of Zoology, George S. Wise Faculty of Life Sciences, Tel Aviv University, 69978 Tel Aviv, Israel
| | - Thibaud Monnin
- Le Studium Loire Valley Institute for Advanced Studies, 45000 Orléans, France;
- UMR 7618, Institute of Ecology and Environmental Sciences of Paris, Sorbonne Universités, UPMC Univ Paris 06, 75252 Paris, France
| |
Collapse
|
6
|
Wolf JI, Seppä P. Dispersal and mating in a size-dimorphic ant. Behav Ecol Sociobiol 2016. [DOI: 10.1007/s00265-016-2135-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
7
|
Helft F, Monnin T, Doums C. First Evidence of Inclusive Sexual Selection in the Ant Cataglyphis cursor: Worker Aggressions Differentially Affect Male Access to Virgin Queens. Ethology 2015. [DOI: 10.1111/eth.12376] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- Florence Helft
- Sorbonne Universités, UPMC Univ Paris 06, UMR 7618 Institute of Ecology and Environmental Sciences of Paris; Paris France
- École Pratique des Hautes Études; Paris France
- Département Systématique et Évolution; ISYEB, UMR 7205 CNRS UPMC Muséum National d'Histoire Naturelle; Paris France
| | - Thibaud Monnin
- Sorbonne Universités, UPMC Univ Paris 06, UMR 7618 Institute of Ecology and Environmental Sciences of Paris; Paris France
| | - Claudie Doums
- École Pratique des Hautes Études; Paris France
- Département Systématique et Évolution; ISYEB, UMR 7205 CNRS UPMC Muséum National d'Histoire Naturelle; Paris France
| |
Collapse
|
8
|
Saar M, Leniaud L, Aron S, Hefetz A. At the brink of supercoloniality: genetic, behavioral, and chemical assessments of population structure of the desert ant Cataglyphis niger. Front Ecol Evol 2014. [DOI: 10.3389/fevo.2014.00013] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
9
|
Zimmer SM, Krehenwinkel H, Schneider JM. Rapid range expansion is not restricted by inbreeding in a sexually cannibalistic spider. PLoS One 2014; 9:e95963. [PMID: 24759976 PMCID: PMC3997557 DOI: 10.1371/journal.pone.0095963] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2014] [Accepted: 03/31/2014] [Indexed: 12/20/2022] Open
Abstract
Few studies investigated whether rapid range expansion is associated with an individual's short-term fitness costs due to an increased risk of inbred mating at the front of expansion. In mating systems with low male mating rates both sexes share potential inbreeding costs and general mechanisms to avoid or reduce these costs are expected. The spider Argiope bruennichi expanded its range recently and we asked whether rapid settlement of new sites exposes individuals to a risk of inbreeding. We sampled four geographically separated subpopulations, genotyped individuals, arranged matings and monitored hatching success. Hatching success was lowest in egg-sacs derived from sibling pairs and highest in egg-sacs derived from among-population crosses, while within-population crosses were intermediate. This indicates that inbreeding might affect hatching success in the wild. Unlike expected, differential hatching success of within- and among-population crosses did not correlate with genetic distance of mating pairs. In contrast, we found high genetic diversity based on 16 microsatellite markers and a fragment of the mitochondrial COI gene in all populations. Our results suggest that even a very recent settlement secures the presence of genetically different mating partners. This leads to costs of inbreeding since the population is not inbred.
Collapse
Affiliation(s)
- Stefanie M. Zimmer
- Zoological Institute and Museum, Biozentrum Grindel, University of Hamburg, Hamburg, Germany
- * E-mail:
| | - Henrik Krehenwinkel
- Department of Evolutionary Genetics, Max Planck Institute for Evolutionary Biology, Plön, Germany
| | - Jutta M. Schneider
- Zoological Institute and Museum, Biozentrum Grindel, University of Hamburg, Hamburg, Germany
| |
Collapse
|
10
|
Soare TW, Kumar A, Naish KA, O'Donnell S. Genetic evidence for landscape effects on dispersal in the army ant Eciton burchellii. Mol Ecol 2013; 23:96-109. [PMID: 24372755 DOI: 10.1111/mec.12573] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2012] [Revised: 09/30/2013] [Accepted: 10/15/2013] [Indexed: 11/29/2022]
Abstract
Inhibited dispersal, leading to reduced gene flow, threatens populations with inbreeding depression and local extinction. Fragmentation may be especially detrimental to social insects because inhibited gene flow has important consequences for cooperation and competition within and among colonies. Army ants have winged males and permanently wingless queens; these traits imply male-biased dispersal. However, army ant colonies are obligately nomadic and have the potential to traverse landscapes. Eciton burchellii, the most regularly nomadic army ant, is a forest interior species: colony raiding activities are limited in the absence of forest cover. To examine whether nomadism and landscape (forest clearing and elevation) affect population genetic structure in a montane E. burchellii population, we reconstructed queen and male genotypes from 25 colonies at seven polymorphic microsatellite loci. Pairwise genetic distances among individuals were compared to pairwise geographical and resistance distances using regressions with permutations, partial Mantel tests and random forests analyses. Although there was no significant spatial genetic structure in queens or males in montane forest, dispersal may be male-biased. We found significant isolation by landscape resistance for queens based on land cover (forest clearing), but not on elevation. Summed colony emigrations over the lifetime of the queen may contribute to gene flow in this species and forest clearing impedes these movements and subsequent gene dispersal. Further forest cover removal may increasingly inhibit Eciton burchellii colony dispersal. We recommend maintaining habitat connectivity in tropical forests to promote population persistence for this keystone species.
Collapse
Affiliation(s)
- Thomas W Soare
- Animal Behavior Program, Department of Psychology, University of Washington, Seattle, WA 98195, USA
| | | | | | | |
Collapse
|
11
|
A new eigenfunction spatial analysis describing population genetic structure. Genetica 2013; 141:479-89. [DOI: 10.1007/s10709-013-9747-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2012] [Accepted: 10/18/2013] [Indexed: 10/26/2022]
|
12
|
Jowers MJ, Leniaud L, Cerdá X, Alasaad S, Caut S, Amor F, Aron S, Boulay RR. Social and population structure in the ant Cataglyphis emmae. PLoS One 2013; 8:e72941. [PMID: 24039827 PMCID: PMC3767659 DOI: 10.1371/journal.pone.0072941] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2013] [Accepted: 07/16/2013] [Indexed: 11/30/2022] Open
Abstract
Dispersal has consequences not only for individual fitness, but also for population dynamics, population genetics and species distribution. Social Hymenoptera show two contrasting colony reproductive strategies, dependent and independent colony foundation modes, and these are often associated to the population structures derived from inter and intra-population gene flow processes conditioned by alternative dispersal strategies. Here we employ microsatellite and mitochondrial markers to investigate the population and social genetic structure and dispersal patterns in the ant Cataglyphis emmae at both, local and regional scales. We find that C. emmae is monogynous and polyandrous. Lack of detection of any population viscosity and population structure with nuclear markers at the local scale suggests efficient dispersal, in agreement with a lack of inbreeding. Contrasting demographic differences before and during the mating seasons suggest that C. emmae workers raise sexuals in peripheric nest chambers to reduce intracolonial conflicts. The high genetic differentiation recovered from the mtDNA haplotypes, together with the significant correlation of such to geographic distance, and presence of new nuclear alleles between areas (valleys) suggest long-term historical isolation between these regions, indicative of limited dispersal at the regional scale. Our findings on the ecological, social and population structure of this species increases our understanding of the patterns and processes involved under independent colony foundation.
Collapse
Affiliation(s)
- Michael J. Jowers
- Departamento de Etología y Conservación de la Biodiversidad, Estación Biológica de Doñana (EBD-CSIC), Sevilla, Spain
- Departmento de Biología Animal, Facultad de Ciencias, Universidad de Granada, Granada, Spain
| | - Laurianne Leniaud
- Department of Evolutionary Biology and Ecology, Université Libre de Bruxelles, Brussels, Belgium
| | - Xim Cerdá
- Departamento de Etología y Conservación de la Biodiversidad, Estación Biológica de Doñana (EBD-CSIC), Sevilla, Spain
| | - Samer Alasaad
- Departamento de Etología y Conservación de la Biodiversidad, Estación Biológica de Doñana (EBD-CSIC), Sevilla, Spain
| | - Stephane Caut
- Departamento de Etología y Conservación de la Biodiversidad, Estación Biológica de Doñana (EBD-CSIC), Sevilla, Spain
| | - Fernando Amor
- Departamento de Etología y Conservación de la Biodiversidad, Estación Biológica de Doñana (EBD-CSIC), Sevilla, Spain
| | - Serge Aron
- Department of Evolutionary Biology and Ecology, Université Libre de Bruxelles, Brussels, Belgium
| | - Raphaël R. Boulay
- Departmento de Biología Animal, Facultad de Ciencias, Universidad de Granada, Granada, Spain
- IRBI, Université François Rabelais de Tours, Tours, France
| |
Collapse
|
13
|
Yamamoto J, Uchida K, Takami Y. Colonization and Persistence of Urban Ant Populations as Revealed by Joint Estimation of Kinship and Population Genetic Parameters. J Hered 2013; 104:639-48. [DOI: 10.1093/jhered/est041] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
14
|
Ingram KK, Pilko A, Heer J, Gordon DM. Colony life history and lifetime reproductive success of red harvester ant colonies. J Anim Ecol 2013; 82:540-50. [DOI: 10.1111/1365-2656.12036] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2012] [Accepted: 11/12/2012] [Indexed: 11/30/2022]
Affiliation(s)
- Krista K. Ingram
- Department of Biology; Colgate University; Hamilton; NY; 13346; USA
| | - Anna Pilko
- Department of Biology; Stanford University; Stanford; CA; 94305-5020; USA
| | - Jeffrey Heer
- Department of Computer Science; Stanford University; Stanford; CA; 94305-5020; USA
| | - Deborah M. Gordon
- Department of Biology; Stanford University; Stanford; CA; 94305-5020; USA
| |
Collapse
|
15
|
Diniz-Filho JAF, Bini LM. Thirty-five years of spatial autocorrelation analysis in population genetics: an essay in honour of Robert Sokal (1926-2012). Biol J Linn Soc Lond 2012. [DOI: 10.1111/j.1095-8312.2012.01987.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - Luis Mauricio Bini
- Departamento de Ecologia, Instituto de Ciências Biológicas; Universidade Federal de Goiás; CP 131 Campus II 74001-970; Goiânia; GO; Brazil
| |
Collapse
|
16
|
FOITZIK S, RÜGER MH, KURECK IM, METZLER D. Macro- and microgeographic genetic structure in an ant species with alternative reproductive tactics in sexuals. J Evol Biol 2011; 24:2721-30. [DOI: 10.1111/j.1420-9101.2011.02397.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
17
|
LENIAUD LAURIANNE, HEFTEZ ABRAHAM, GRUMIAU LAURENT, ARON SERGE. Multiple mating and supercoloniality in Cataglyphis desert ants. Biol J Linn Soc Lond 2011. [DOI: 10.1111/j.1095-8312.2011.01772.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
18
|
Chéron B, Cronin AL, Doums C, Fédérici P, Haussy C, Tirard C, Monnin T. Unequal resource allocation among colonies produced by fission in the ant Cataglyphis cursor. Ecology 2011; 92:1448-58. [PMID: 21870619 DOI: 10.1890/10-2347.1] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
How organisms allocate limited resources to reproduction is critical to their fitness. The size and number of offspring produced have been the focus of many studies. Offspring size affects survival and growth and determines offspring number in the many species where there is a trade-off between size and number. Many social insects reproduce by colony fission, whereby young queens and accompanying workers split off from a colony to form new colonies. The size of a new colony (number of workers) is set at the time of the split, and this may allow fine tuning size to local conditions. Despite the prevalence of colony fission and the ecological importance of social insects, little is known of colony fission except in honey bees. We studied colony fission in the ant Cataglyphis cursor. For clarity, "colony" and "nest" refer to colonies before and after colony fission, respectively (i.e., each colony fissions into several nests). The reproductive effort of colonies was highly variable: Colonies that fissioned varied markedly in size, and many colonies that did not fission were as large as some of the fissioning colonies. The mother queen was replaced in half of the fissioning colonies, which produced 4.0 +/- 1.3 (mean +/- SD) nests of markedly varied size. Larger fissioning colonies produced larger nests but did not produce more nests, and resource allocation among nests was highly biased. When a colony produced several nests and the mother queen was not replaced, the nest containing the mother queen was larger than nests with a young queen. These results show that the pattern of resource allocation differs between C. cursor and honey bees. They also suggest that C. cursor may follow a bet-hedging strategy with regard to both the colony size at which fission occurs and the partitioning of resources among nests. In addition, colony fission may be influenced by the age and/or condition of the mother queen, and the fact that workers allocating resources among nests have incomplete knowledge of the size and number of nests produced. These results show that the process of colony fission is more diverse than currently acknowledged and that studies of additional species are needed.
Collapse
Affiliation(s)
- Blandine Chéron
- Laboratoire Ecologie and Evolution CNRS UMR 7625, Université Pierre et Marie Curie, 7 Quai Saint Bernard, 75005 Paris, France
| | | | | | | | | | | | | |
Collapse
|
19
|
Bretman A, Rodríguez-Muñoz R, Walling C, Slate J, Tregenza T. Fine-scale population structure, inbreeding risk and avoidance in a wild insect population. Mol Ecol 2011; 20:3045-55. [PMID: 21645160 DOI: 10.1111/j.1365-294x.2011.05140.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The ecological and evolutionary importance of fine-scale genetic structure within populations is increasingly appreciated. However, available data are largely restricted to wild vertebrates and eusocial insects. In addition, there is the expectation that most insects tend to have such large- and high-density populations and are so mobile that they are unlikely to face inbreeding risks through fine-scale population structuring. This has made the growing body of evidence for inbreeding avoidance in insects and its implication in mating systems evolution somewhat enigmatic. We present a 4-year study of a natural population of field crickets. Using detailed video monitoring combined with genotyping, we track the movement of all adults within the population and investigate genetic structure at a fine scale. We find some evidence for relatives being found in closer proximity, both across generations and within a single breeding season. Whilst incestuous matings are not avoided, population inbreeding is low, suggesting that mating is close to random and the limited fine-scale structure does not create significant inbreeding risk. Hence, there is little evidence for selective pressures associated with the evolution of inbreeding avoidance mechanisms in a closely related species.
Collapse
Affiliation(s)
- Amanda Bretman
- Centre for Ecology and Conservation, School of Biosciences, University of Exeter, Cornwall Campus, Penryn TR10 9EZ, UK
| | | | | | | | | |
Collapse
|
20
|
Kettle CJ, Maycock CR, Ghazoul J, Hollingsworth PM, Khoo E, Sukri RSH, Burslem DFRP. Ecological implications of a flower size/number trade-off in tropical forest trees. PLoS One 2011; 6:e16111. [PMID: 21408110 PMCID: PMC3052255 DOI: 10.1371/journal.pone.0016111] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2010] [Accepted: 12/12/2010] [Indexed: 11/24/2022] Open
Abstract
BACKGROUND In angiosperms, flower size commonly scales negatively with number. The ecological consequences of this trade-off for tropical trees remain poorly resolved, despite their potential importance for tropical forest conservation. We investigated the flower size number trade-off and its implications for fecundity in a sample of tree species from the Dipterocarpaceae on Borneo. METHODOLOGY/PRINCIPAL FINDINGS We combined experimental exclusion of pollinators in 11 species, with direct and indirect estimates of contemporary pollen dispersal in two study species and published estimates of pollen dispersal in a further three species to explore the relationship between flower size, pollinator size and mean pollen dispersal distance. Maximum flower production was two orders of magnitude greater in small-flowered than large-flowered species of Dipterocarpaceae. In contrast, fruit production was unrelated to flower size and did not differ significantly among species. Small-flowered species had both smaller-sized pollinators and lower mean pollination success than large-flowered species. Average pollen dispersal distances were lower and frequency of mating between related individuals was higher in a smaller-flowered species than a larger-flowered confamilial. Our synthesis of pollen dispersal estimates across five species of dipterocarp suggests that pollen dispersal scales positively with flower size. CONCLUSIONS AND THEIR SIGNIFICANCE Trade-offs embedded in the relationship between flower size and pollination success contribute to a reduction in the variance of fecundity among species. It is therefore plausible that these processes could delay competitive exclusion and contribute to maintenance of species coexistence in this ecologically and economically important family of tropical trees. These results have practical implications for tree species conservation and restoration. Seed collection from small-flowered species may be especially vulnerable to cryptic genetic erosion. Our findings also highlight the potential for differential vulnerability of tropical tree species to the deleterious consequences of forest fragmentation.
Collapse
Affiliation(s)
- Chris J Kettle
- Ecosystem Management, Institute of Terrestrial Ecosystems, ETH Zurich, Zurich, Switzerland.
| | | | | | | | | | | | | |
Collapse
|
21
|
Row JR, Blouin-Demers G, Lougheed SC. Habitat distribution influences dispersal and fine-scale genetic population structure of eastern foxsnakes (Mintonius gloydi) across a fragmented landscape. Mol Ecol 2010; 19:5157-71. [PMID: 20977510 DOI: 10.1111/j.1365-294x.2010.04872.x] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Dispersal is a fundamental attribute of species in nature and shapes population dynamics, evolutionary trajectories and genetic variation across spatial and temporal scales. It is increasingly clear that landscape features have large impacts on dispersal patterns. Thus, understanding how individuals and species move through landscapes is essential for predicting impacts of landscape alterations. Information on dispersal patterns, however, is lacking for many taxa, particularly reptiles. Eastern foxsnakes (Mintoinus gloydi) are marsh and prairie specialists that avoid agricultural fields, but they have persisted across a fragmented region in southwestern Ontario and northern Ohio. Here, we combined habitat suitability modelling with population genetic analyses to infer how foxsnakes disperse through a habitat mosaic of natural and altered landscape features. Boundary regions between the eight genetic clusters, identified through assignment tests, were comprised of low suitability habitat (e.g. agricultural fields). Island populations were grouped into a single genetic cluster, and comparatively low F(ST) values between island and mainland populations suggest open water presents less of a barrier than nonsuitable terrestrial habitat. Isolation by resistance and least-cost path analysis produced similar results with matrices of pairwise individual genetic distance significantly more correlated to matrices of resistance values derived from habitat suitability than models with an undifferentiated landscape. Spatial autocorrelation results matched better with assignment results when incorporating resistance values rather than straight-line distances. All analyses used in our study produced similar results suggesting that habitat degradation limits dispersal for foxsnakes, which has had a strong effect on the genetic population structure across this region.
Collapse
Affiliation(s)
- Jeffrey R Row
- Department of Biology, Queen's University, 116 Barrie Street, Kingston, ON K7L 3N6, Canada
| | | | | |
Collapse
|
22
|
Extreme population differentiation in a vulnerable slavemaking ant with a fragmented distribution. CONSERV GENET 2010. [DOI: 10.1007/s10592-010-0063-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|