1
|
Genetic Diversity and Maternal Lineage of Indo-Pacific Bottlenose Dolphin (Tursiops aduncus) in the Andaman Sea of Thailand. DIVERSITY 2022. [DOI: 10.3390/d14121093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Indo-Pacific bottlenose dolphins (Tursiops aduncus) are a coastal species found in Thai waters off the coasts of the Andaman Sea and the Gulf of Thailand. This species was recently re-listed as near-threatened by the IUCN Red List, though the population status in Thai seas is not known. Here, we investigated genetic diversity, population structure, maternal lineage, and demographics by analyzing skin tissue samples (n = 30) of T. aduncus stranded along the Andaman coastline of Thailand between 1990 and 2019. This study was based on 11 microsatellite loci and 265 bp mtDNA control regions compared to data available through the National Center for Biotechnology Information (NCBI). From microsatellites, the observed heterozygosity (Ho) ranged from 0.46 to 0.85. The mean fixation index (F) value for all loci was 0.10 ± 0.04, which suggests some degree of inbreeding. Two genetic clusters (the most likely K at K = 2) were observed in T. aduncus through the population structure analysis using multiple criteria. For the mtDNA control region, a total of 17 haplotypes were found for dolphins in Thai seas (14 haplotypes from our samples; three haplotypes from the NCBI database) with high levels of haplotype diversity (h) at 0.926 ± 0.027 and nucleotide diversity (π) at 0.045 ± 0.002. A decline in the effective population size from 0.05 million years ago also was observed in Thai T. aduncus through Bayesian Skyline Plots analysis. A unique set of haplotypes was identified in our samples, which may have originated from the Australian and Indian Oceans rather than the Western Pacific Ocean. These results improve our understanding of the maternal lineage of the Indo-Pacific bottlenose dolphin, which can be used for monitoring population status and establishing better conservation plans for this species in the Thai Andaman Sea.
Collapse
|
2
|
Patterns of association and distribution of estuarine-resident common bottlenose dolphins (Tursiops truncatus) in North Carolina, USA. PLoS One 2022; 17:e0270057. [PMID: 35969521 PMCID: PMC9377618 DOI: 10.1371/journal.pone.0270057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Accepted: 06/02/2022] [Indexed: 11/19/2022] Open
Abstract
The social structure of estuarine-resident bottlenose dolphins is complex and varied. Residing in habitats often utilized for resource exploitation, dolphins are at risk due to anthropogenic pressures while still federally protected. Effective conservation is predicated upon accurate abundance estimates. In North Carolina, two estuarine-resident stocks (demographically independent groups) of common bottlenose dolphin have been designated using spatiotemporal criteria. Both stocks are subjected to bycatch in fishing gear. The southern North Carolina estuarine stock was estimated at <200 individuals from surveys in 2006, which is outdated per US guidelines. Thus, we conducted a new capture-mark-recapture survey in 2018, identifying 547 distinct individuals, about three times higher than the prior abundance estimate. We compared those individuals to our long-term photo-identification catalog (1995–2018, n = 2,423 individuals), matching 228 individuals. Of those 228, 65 were also included in the 2013 abundance estimate for the northern North Carolina estuarine stock. Using sighting histories for all individuals in the long-term catalog, we conducted a social network analysis, which is independent of a priori stock assignments. The three primary clusters identified were inconsistent with current stock designations and not defined by spatiotemporal distribution. All three clusters had sighting histories in the estuary and on the coast, however, that with the highest within-cluster associations appeared to use estuarine waters more often. The within-cluster association strength was low for one cluster, possibly due to only part of that cluster inhabiting the southern North Carolina estuarine system. Between-cluster differences occurred in infestation rates by the pseudostalked barnacle, Xenobalanus globicipitis, but that did not predict clusters. We suggest the need to re-evaluate the stock structure of estuarine-resident common bottlenose dolphins in North Carolina and currently have insufficient information to assign an abundance estimate to a currently designated stock.
Collapse
|
3
|
Álvarez-Varas R, Heidemeyer M, Riginos C, Benítez HA, Reséndiz E, Lara-Uc M, Godoy DA, Muñoz-Pérez JP, Alarcón-Ruales DE, Vélez-Rubio GM, Fallabrino A, Piovano S, Alfaro-Shigueto J, Ortiz-Alvarez C, Mangel JC, Esquerré D, Zárate P, Medrano C, León Miranda F, Guerrero F, Vianna JA, Véliz D. Integrating morphological and genetic data at different spatial scales in a cosmopolitan marine turtle species: challenges for management and conservation. Zool J Linn Soc 2020. [DOI: 10.1093/zoolinnean/zlaa066] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
AbstractPatterns of genetic structure in highly mobile marine vertebrates may be accompanied by phenotypic variation. Most studies in marine turtles focused on population genetic structure have been performed at rookeries. We studied whether genetic and morphological variation of the endangered green turtle (Chelonia mydas) is consistent geographically, focusing on foraging grounds. An association between population genetic structure and body shape variation at broad (inter-lineage) and fine (foraging grounds) scales was predicted and analysed using mitochondrial DNA and geometric morphometrics. Although genetic and phenotypic differentiation patterns were congruent between lineages, no fine-scale association was found, suggesting adaptive divergence. Connectivity among Pacific foraging grounds found here suggests that temperatures of ocean surface currents may influence the genetic structure of C. mydas on a broad scale. Our results suggest that vicariance, dispersal, life-history traits and ecological conditions operating in foraging grounds have shaped the intraspecific morphology and genetic diversity of this species. Considering a range of geographic and temporal scales is useful when management strategies are required for cosmopolitan species. Integrating morphological and genetic tools at different spatial scales, conservation management is proposed based on protection of neutral and adaptive diversity. This approach opens new questions and challenges, especially regarding conservation genetics in cosmopolitan species.
Collapse
Affiliation(s)
- Rocío Álvarez-Varas
- Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile, Santiago, Chile
- Núcleo Milenio de Ecología y Manejo Sustentable de Islas Oceánicas (ESMOI), Departamento de Biología Marina, Universidad Católica del Norte, Coquimbo, Chile
- Qarapara Tortugas Marinas Chile Non-governmental Organization, Santiago, Chile
| | - Maike Heidemeyer
- Centro de Investigación en Biología Celular y Molecular (CIBCM), Universidad de Costa Rica, San José, Costa Rica
| | - Cynthia Riginos
- School of Biological Sciences, The University of Queensland, Brisbane, Australia
| | - Hugo A Benítez
- Centro de Investigación de Estudios Avanzados del Maule, Universidad Católica del Maule, Talca, Chile
| | - Eduardo Reséndiz
- Departamento Académico de Ciencias Marinas y Costeras, Universidad Autónoma de Baja California Sur, México
| | - Mónica Lara-Uc
- Departamento Académico de Ciencias Marinas y Costeras, Universidad Autónoma de Baja California Sur, México
| | - Daniel A Godoy
- Coastal-Marine Research Group, Institute of Natural and Mathematical Sciences, Massey University, Auckland, New Zealand
| | - Juan Pablo Muñoz-Pérez
- Galapagos Science Center GSC (Universidad San Francisco de Quito USFQ-University of North Carolina at Chapel Hill UNC), Isla San Cristobal, Galapagos, Ecuador
- University of the Sunshine Coast USC, Queensland, Australia
| | - Daniela E Alarcón-Ruales
- Galapagos Science Center GSC (Universidad San Francisco de Quito USFQ-University of North Carolina at Chapel Hill UNC), Isla San Cristobal, Galapagos, Ecuador
| | | | | | - Susanna Piovano
- School of Marine Studies, The University of the South Pacific, Suva, Fiji
| | - Joanna Alfaro-Shigueto
- ProDelphinus, Lima, Peru
- Facultad de Biología Marina, Universidad Científica del Sur, Lima, Peru
| | | | | | - Damien Esquerré
- Division of Ecology and Evolution, Research School of Biology, The Australian National University, Canberra, Australia
| | - Patricia Zárate
- Departamento de Oceanografía y Medio Ambiente, Instituto de Fomento Pesquero, Valparaíso, Chile
| | - Carol Medrano
- Qarapara Tortugas Marinas Chile Non-governmental Organization, Santiago, Chile
| | - Fabiola León Miranda
- Departamento de Ecosistemas y Medio Ambiente, Facultad de Agronomía e Ingeniería Forestal, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Felipe Guerrero
- Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile, Santiago, Chile
- Qarapara Tortugas Marinas Chile Non-governmental Organization, Santiago, Chile
| | - Juliana A Vianna
- Departamento de Ecosistemas y Medio Ambiente, Facultad de Agronomía e Ingeniería Forestal, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - David Véliz
- Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile, Santiago, Chile
- Núcleo Milenio de Ecología y Manejo Sustentable de Islas Oceánicas (ESMOI), Departamento de Biología Marina, Universidad Católica del Norte, Coquimbo, Chile
| |
Collapse
|
4
|
Van Cise AM, Mahaffy SD, Baird RW, Mooney TA, Barlow J. Song of my people: dialect differences among sympatric social groups of short-finned pilot whales in Hawai’i. Behav Ecol Sociobiol 2018. [DOI: 10.1007/s00265-018-2596-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
5
|
Pratt EAL, Beheregaray LB, Bilgmann K, Zanardo N, Diaz-Aguirre F, Möller LM. Hierarchical metapopulation structure in a highly mobile marine predator: the southern Australian coastal bottlenose dolphin (Tursiops cf. australis). CONSERV GENET 2018. [DOI: 10.1007/s10592-017-1043-6] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
6
|
Ywasaki Lima J, Machado FB, Farro APC, Barbosa LDA, da Silveira LS, Medina-Acosta E. Population genetic structure of Guiana dolphin (Sotalia guianensis) from the southwestern Atlantic coast of Brazil. PLoS One 2017; 12:e0183645. [PMID: 28837691 PMCID: PMC5570289 DOI: 10.1371/journal.pone.0183645] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Accepted: 08/08/2017] [Indexed: 11/19/2022] Open
Abstract
Sotalia guianensis is a small dolphin that is vulnerable to anthropogenic impacts. Along the Brazilian Atlantic coast, this species is threatened with extinction. A prioritized action plan for conservation strategies relies on increased knowledge of the population. The scarcity of studies about genetic diversity and assessments of population structure for this animal have precluded effective action in the region. Here, we assessed, for the first time, the genetic differentiation at 14 microsatellite loci in 90 S. guianensis specimens stranded on the southeastern Atlantic coast of the State of Espírito Santo, Brazil. We estimated population parameters and structure, measured the significance of global gametic disequilibrium and the intensity of non-random multiallelic interallelic associations and constructed a provisional synteny map using Bos taurus, the closest terrestrial mammal with a reference genome available. All microsatellite loci were polymorphic, with at least three and a maximum of ten alleles each. Allele frequencies ranged from 0.01 to 0.97. Observed heterozygosity ranged from 0.061 to 0.701. The mean inbreeding coefficient was 0.103. Three loci were in Hardy-Weinberg disequilibrium even when missing genotypes were inferred. Although 77 of the 91 possible two-locus associations were in global gametic equilibrium, we unveiled 13 statistically significant, sign-based, non-random multiallelic interallelic associations in 10 two-locus combinations with either coupling (D' values ranging from 0.782 to 0.353) or repulsion (D' values -0.517 to -1.000) forces. Most of the interallelic associations did not involve the major alleles. Thus, for either physically or non-physically linked loci, measuring the intensity of non-random interallelic associations is important for defining the evolutionary forces at equilibrium. We uncovered a small degree of genetic differentiation (FST = 0.010; P-value = 0.463) with a hierarchical clustering into one segment containing members from the southern and northern coastal regions. The data thus support the scenario of little genetic structure in the population of S. guianensis in this geographic area.
Collapse
Affiliation(s)
- Juliana Ywasaki Lima
- Laboratory of Morphology and Animal Pathology, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, Rio de Janeiro, Brazil
- Laboratory of Biotechnology, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, Rio de Janeiro, Brazil
- * E-mail: (JYL); (EMA)
| | - Filipe Brum Machado
- Laboratory of Biotechnology, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, Rio de Janeiro, Brazil
| | - Ana Paula Cazerta Farro
- Laboratory of Genetics and Animal Conservation, Universidade Federal do Espírito Santo, São Mateus, Espírito Santo, Brazil
| | | | - Leonardo Serafim da Silveira
- Laboratory of Morphology and Animal Pathology, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, Rio de Janeiro, Brazil
| | - Enrique Medina-Acosta
- Laboratory of Biotechnology, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, Rio de Janeiro, Brazil
- * E-mail: (JYL); (EMA)
| |
Collapse
|
7
|
Dulau V, Estrade V, Fayan J. Identifying key demographic parameters of a small island-associated population of Indo-Pacific bottlenose dolphins (Reunion, Indian Ocean). PLoS One 2017. [PMID: 28640918 PMCID: PMC5480988 DOI: 10.1371/journal.pone.0179780] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Photo-identification surveys of Indo-Pacific bottlenose dolphins were conducted from 2009 to 2014 off Reunion Island (55°E33’/21°S07’), in the Indian Ocean. Robust Design models were applied to produce the most reliable estimate of population abundance and survival rate, while accounting for temporary emigration from the survey area (west coast). The sampling scheme consisted of a five-month (June–October) sampling period in each year of the study. The overall population size at Reunion was estimated to be 72 individuals (SE = 6.17, 95%CI = 61–85), based on a random temporary emigration (γ”) of 0.096 and a proportion of 0.70 (SE = 0.03) distinct individuals. The annual survival rate was 0.93 (±0.018 SE, 95%CI = 0.886–0.958) and was constant over time and between sexes. Models considering gender groups indicated different movement patterns between males and females. Males showed null or quasi-null temporary emigration (γ” = γ’ < 0.01), while females showed a random temporary emigration (γ”) of 0.10, suggesting that a small proportion of females was outside the survey area during each primary sampling period. Sex-specific temporary migration patterns were consistent with movement and residency patterns observed in other areas. The Robust Design approach provided an appropriate sampling scheme for deriving island-associated population parameters, while allowing to restrict survey effort both spatially (i.e. west coast only) and temporally (five months per year). Although abundance and survival were stable over the six years, the small population size of fewer than 100 individuals suggested that this population is highly vulnerable. Priority should be given to reducing any potential impact of human activity on the population and its habitat.
Collapse
Affiliation(s)
- Violaine Dulau
- GLOBICE-Reunion, Grand Bois, Saint Pierre, Reunion Island, France
- * E-mail:
| | - Vanessa Estrade
- GLOBICE-Reunion, Grand Bois, Saint Pierre, Reunion Island, France
| | - Jacques Fayan
- BNOI-ONCFS, Parc de la Providence, Saint-Denis, Reunion Island, France
| |
Collapse
|
8
|
Hohn AA, Thomas L, Carmichael RH, Litz J, Clemons-Chevis C, Shippee SF, Sinclair C, Smith S, Speakman TR, Tumlin MC, Zolman ES. Assigning stranded bottlenose dolphins to source stocks using stable isotope ratios following the Deepwater Horizon oil spill. ENDANGER SPECIES RES 2017. [DOI: 10.3354/esr00783] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
|
9
|
Oceanographic drivers of population differentiation in Indo-Pacific bottlenose (Tursiops aduncus) and humpback (Sousa spp.) dolphins of the northern Bay of Bengal. CONSERV GENET 2016. [DOI: 10.1007/s10592-016-0913-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
|
10
|
Gariboldi MC, Túnez JI, Failla M, Hevia M, Panebianco MV, Paso Viola MN, Vitullo AD, Cappozzo HL. Patterns of population structure at microsatellite and mitochondrial DNA markers in the franciscana dolphin ( Pontoporia blainvillei). Ecol Evol 2016; 6:8764-8776. [PMID: 28035267 PMCID: PMC5192793 DOI: 10.1002/ece3.2596] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2016] [Revised: 10/07/2016] [Accepted: 10/19/2016] [Indexed: 12/25/2022] Open
Abstract
The franciscana dolphin, Pontorporia blainvillei, is an endemic cetacean of the Atlantic coast of South America. Its coastal distribution and restricted movement patterns make this species vulnerable to anthropogenic factors, particularly to incidental bycatch. We used mitochondrial DNA control region sequences, 10 microsatellites, and sex data to investigate the population structure of the franciscana dolphin from a previously established management area, which includes the southern edge of its geographic range. F‐statistics and Bayesian cluster analyses revealed the existence of three genetically distinct populations. Based on the microsatellite loci, similar levels of genetic variability were found in the area; 13 private alleles were found in Monte Hermoso, but none in Claromecó. When considering the mitochondrial DNA control region sequences, lower levels of genetic diversity were found in Monte Hermoso, when compared to the other localities. Low levels of gene flow were found between most localities. Additionally, no evidence of isolation by distance nor sex‐biased dispersal was detected in the study area. In view of these results showing that populations from Necochea/Claromecó, Monte Hermoso, and Río Negro were found to be genetically distinct and the available genetic information for the species previously published, Argentina would comprise five distinct populations: Samborombón West/Samborombón South, Cabo San Antonio/Buenos Aires East, Necochea/Claromecó/Buenos Aires Southwest, Monte Hermoso, and Río Negro. In order to ensure the long‐term survival of the franciscana dolphin, management and conservation strategies should be developed considering each of these populations as different management units.
Collapse
Affiliation(s)
- María Constanza Gariboldi
- Centro de Estudios Biomédicos, Biotecnológicos, Ambientales y Diagnóstico (CEBBAD) Universidad MaimónidesCiudad Autónoma de Buenos Aires Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) Ciudad Autónoma de Buenos Aires Argentina
| | - Juan Ignacio Túnez
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) Ciudad Autónoma de Buenos Aires Argentina; Grupo de Estudios en Ecología de Mamíferos Departamento de Ciencias Básicas Universidad Nacional de Luján Luján Argentina
| | | | | | - María Victoria Panebianco
- Laboratorio de Ecología Comportamiento y Mamíferos Marinos Museo Argentino de Ciencias Naturales "Bernardino Rivadavia" Ciudad Autónoma de Buenos Aires Argentina
| | - María Natalia Paso Viola
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) Ciudad Autónoma de Buenos Aires Argentina; Laboratorio de Ecología Comportamiento y Mamíferos Marinos Museo Argentino de Ciencias Naturales "Bernardino Rivadavia" Ciudad Autónoma de Buenos Aires Argentina; Laboratorio de Ecología y Conservación de Vida Silvestre Centro Austral de Investigaciones Científicas (CADIC) Ushuaia Argentina
| | - Alfredo Daniel Vitullo
- Centro de Estudios Biomédicos, Biotecnológicos, Ambientales y Diagnóstico (CEBBAD) Universidad MaimónidesCiudad Autónoma de Buenos Aires Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) Ciudad Autónoma de Buenos Aires Argentina
| | - Humberto Luis Cappozzo
- Centro de Estudios Biomédicos, Biotecnológicos, Ambientales y Diagnóstico (CEBBAD) Universidad Maimónides Ciudad Autónoma de Buenos Aires Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) Ciudad Autónoma de Buenos Aires Argentina; Laboratorio de Ecología Comportamiento y Mamíferos Marinos Museo Argentino de Ciencias Naturales "Bernardino Rivadavia" Ciudad Autónoma de Buenos Aires Argentina; Fundación de Historia Natural Félix de Azara Universidad Maimónides Ciudad Autónoma de Buenos Aires Argentina
| |
Collapse
|
11
|
Pérez-Alvarez MJ, Olavarría C, Moraga R, Baker CS, Hamner RM, Poulin E. Historical dimensions of population structure in a continuously distributed marine species: The case of the endemic Chilean dolphin. Sci Rep 2016; 6:35507. [PMID: 27759113 PMCID: PMC5069719 DOI: 10.1038/srep35507] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Accepted: 09/30/2016] [Indexed: 11/23/2022] Open
Abstract
The complementarity of historical and contemporary processes contributes to understanding the genetic structure of continuously distributed marine species with high dispersal capabilities. Cephalorhynchus eutropia, has a continuous coastal distribution with strong genetic differentiation identified by nuclear DNA markers. We explored the historical dimension of this genetic differentiation between northern and southern populations to evaluate phylogeographic structure. Additionally, we conducted mtDNA and microsatellite analyses to detect past and recent demographic changes. The southern population was characterized by lower genetic diversity with a signal of population expansion, likely associated with ice retreat and habitat extension after the Last Glacial Maximum (LGM). In contrast, structure within the northern population was more consistent with stable historical population size. Approximate Bayesian Computation analyses suggested that during the LGM, C. eutropia persisted in the northern area; while the south was colonized by dispersal ~11,000 years ago followed by population expansion. This study shows that Chilean dolphin population structure is consistent with predictions from the Expansion-Contraction biogeographic model, with a poleward post-glacial shift revealed in current genetic structure. The results also confirm the validity of the population units previously identified, demonstrating their historical origin and highlighting the utility of integrating genetic markers with different temporal scale resolutions.
Collapse
Affiliation(s)
- M J Pérez-Alvarez
- Instituto de Ecología y Biodiversidad (IEB), Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425, Ñuñoa, Santiago, Chile.,Centro de Investigación Eutropia, Ahumada 131 Oficina 912, Santiago, Chile
| | - C Olavarría
- Centro de Investigación Eutropia, Ahumada 131 Oficina 912, Santiago, Chile.,Fundación CEQUA, 21 de Mayo 1690, Punta Arenas, Chile.,Centro de Estudios Avanzados en Zonas Áridas (CEAZA), Raúl Bitrán1305, La Serena, Chile
| | - R Moraga
- Centro de Investigación Eutropia, Ahumada 131 Oficina 912, Santiago, Chile
| | - C S Baker
- Marine Mammal Institute and Department of Fisheries and Wildlife, Oregon State University, Hatfield Marine Science Center, 2030 SE Marine Science Drive, Newport, OR 97365, USA
| | - R M Hamner
- Marine Mammal Institute and Department of Fisheries and Wildlife, Oregon State University, Hatfield Marine Science Center, 2030 SE Marine Science Drive, Newport, OR 97365, USA
| | - E Poulin
- Instituto de Ecología y Biodiversidad (IEB), Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425, Ñuñoa, Santiago, Chile
| |
Collapse
|
12
|
Allen SJ, Bryant KA, Kraus RHS, Loneragan NR, Kopps AM, Brown AM, Gerber L, Krützen M. Genetic isolation between coastal and fishery-impacted, offshore bottlenose dolphin (Tursiopsspp.) populations. Mol Ecol 2016; 25:2735-53. [DOI: 10.1111/mec.13622] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2014] [Revised: 02/17/2016] [Accepted: 03/11/2016] [Indexed: 11/29/2022]
Affiliation(s)
- Simon J. Allen
- Cetacean Research Unit; School of Veterinary and Life Sciences; Murdoch University; Perth Western Australia 6150 Australia
- Centre for Marine Futures; School of Animal Biology and Oceans Institute; University of Western Australia; Perth Western Australia 6009 Australia
| | - Kate A. Bryant
- School of Veterinary and Life Sciences; Murdoch University; Murdoch Western Australia 6150 Australia
| | - Robert H. S. Kraus
- Department of Biology; University of Konstanz; 78457 Konstanz Germany
- Department of Migration and Immuno-Ecology; Max Planck Institute for Ornithology; Am Obstberg 1 78315 Radolfzell Germany
| | - Neil R. Loneragan
- School of Veterinary and Life Sciences; Murdoch University; Murdoch Western Australia 6150 Australia
| | - Anna M. Kopps
- Evolutionary Genetics Group; Department of Anthropology; University of Zurich; Winterthurerstrasse 190 8057 Zurich Switzerland
- Evolution and Ecology Research Centre; School of Biological; Earth and Environmental Sciences; University of New South Wales; Sydney New South Wales 2052 Australia
| | - Alexander M. Brown
- Cetacean Research Unit; School of Veterinary and Life Sciences; Murdoch University; Perth Western Australia 6150 Australia
| | - Livia Gerber
- Evolutionary Genetics Group; Department of Anthropology; University of Zurich; Winterthurerstrasse 190 8057 Zurich Switzerland
| | - Michael Krützen
- Evolutionary Genetics Group; Department of Anthropology; University of Zurich; Winterthurerstrasse 190 8057 Zurich Switzerland
| |
Collapse
|
13
|
Population Genetics of Franciscana Dolphins (Pontoporia blainvillei): Introducing a New Population from the Southern Edge of Their Distribution. PLoS One 2015. [PMID: 26221960 PMCID: PMC4519281 DOI: 10.1371/journal.pone.0132854] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
Due to anthropogenic factors, the franciscana dolphin, Pontoporia blainvillei, is the most threatened small cetacean on the Atlantic coast of South America. Four Franciscana Management Areas have been proposed: Espiritu Santo to Rio de Janeiro (FMA I), São Paulo to Santa Catarina (FMA II), Rio Grande do Sul to Uruguay (FMA III), and Argentina (FMA IV). Further genetic studies distinguished additional populations within these FMAs. We analyzed the population structure, phylogeography, and demographic history in the southernmost portion of the species range. From the analysis of mitochondrial DNA control region sequences, 5 novel haplotypes were found, totalizing 60 haplotypes for the entire distribution range. The haplotype network did not show an apparent phylogeographical signal for the southern FMAs. Two populations were identified: Monte Hermoso (MH) and Necochea (NC)+Claromecó (CL)+Río Negro (RN). The low levels of genetic variability, the relative constant size over time, and the low levels of gene flow may indicate that MH has been colonized by a few maternal lineages and became isolated from geographically close populations. The apparent increase in NC+CL+RN size would be consistent with the higher genetic variability found, since genetic diversity is generally higher in older and expanding populations. Additionally, RN may have experienced a recent split from CL and NC; current high levels of gene flow may be occurring between the latter ones. FMA IV would comprise four franciscana dolphin populations: Samborombón West+Samborombón South, Cabo San Antonio+Buenos Aires East, NC+CL+Buenos Aires Southwest+RN and MH. Results achieved in this study need to be taken into account in order to ensure the long-term survival of the species.
Collapse
|
14
|
Gagnaire PA, Broquet T, Aurelle D, Viard F, Souissi A, Bonhomme F, Arnaud-Haond S, Bierne N. Using neutral, selected, and hitchhiker loci to assess connectivity of marine populations in the genomic era. Evol Appl 2015; 8:769-86. [PMID: 26366195 PMCID: PMC4561567 DOI: 10.1111/eva.12288] [Citation(s) in RCA: 190] [Impact Index Per Article: 21.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2015] [Accepted: 06/05/2015] [Indexed: 12/14/2022] Open
Abstract
Estimating the rate of exchange of individuals among populations is a central concern to evolutionary ecology and its applications to conservation and management. For instance, the efficiency of protected areas in sustaining locally endangered populations and ecosystems depends on reserve network connectivity. The population genetics theory offers a powerful framework for estimating dispersal distances and migration rates from molecular data. In the marine realm, however, decades of molecular studies have met limited success in inferring genetic connectivity, due to the frequent lack of spatial genetic structure in species exhibiting high fecundity and dispersal capabilities. This is especially true within biogeographic regions bounded by well-known hotspots of genetic differentiation. Here, we provide an overview of the current methods for estimating genetic connectivity using molecular markers and propose several directions for improving existing approaches using large population genomic datasets. We highlight several issues that limit the effectiveness of methods based on neutral markers when there is virtually no genetic differentiation among samples. We then focus on alternative methods based on markers influenced by selection. Although some of these methodologies are still underexplored, our aim was to stimulate new research to test how broadly they are applicable to nonmodel marine species. We argue that the increased ability to apply the concepts of cline analyses will improve dispersal inferences across physical and ecological barriers that reduce connectivity locally. We finally present how neutral markers hitchhiking with selected loci can also provide information about connectivity patterns within apparently well-mixed biogeographic regions. We contend that one of the most promising applications of population genomics is the use of outlier loci to delineate relevant conservation units and related eco-geographic features across which connectivity can be measured.
Collapse
Affiliation(s)
- Pierre-Alexandre Gagnaire
- Université de Montpellier Montpellier, France ; CNRS - Institut des Sciences de l'Evolution, UMR 5554 UM-CNRS-IRD-EPHE, Station Méditerranéenne de l'Environnement Littoral Sète, France
| | - Thomas Broquet
- CNRS team Diversity and connectivity of coastal marine landscapes, Station Biologique de Roscoff Roscoff, France ; Sorbonne Universités, UPMC Université Paris 06, UMR 7144, Station Biologique de Roscoff Roscoff, France
| | - Didier Aurelle
- Aix Marseille Université, CNRS-IRD-Avignon Université, IMBE UMR 7263 Marseille, France
| | - Frédérique Viard
- CNRS team Diversity and connectivity of coastal marine landscapes, Station Biologique de Roscoff Roscoff, France ; Sorbonne Universités, UPMC Université Paris 06, UMR 7144, Station Biologique de Roscoff Roscoff, France
| | | | - François Bonhomme
- Université de Montpellier Montpellier, France ; CNRS - Institut des Sciences de l'Evolution, UMR 5554 UM-CNRS-IRD-EPHE, Station Méditerranéenne de l'Environnement Littoral Sète, France
| | - Sophie Arnaud-Haond
- Université de Montpellier Montpellier, France ; Ifremer, UMR "Ecosystèmes Marins Exploités" Sète, France
| | - Nicolas Bierne
- Université de Montpellier Montpellier, France ; CNRS - Institut des Sciences de l'Evolution, UMR 5554 UM-CNRS-IRD-EPHE, Station Méditerranéenne de l'Environnement Littoral Sète, France
| |
Collapse
|
15
|
Microsatellite markers reveal strong genetic structure in the endemic Chilean dolphin. PLoS One 2015; 10:e0123956. [PMID: 25898340 PMCID: PMC4405423 DOI: 10.1371/journal.pone.0123956] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2014] [Accepted: 02/26/2015] [Indexed: 11/19/2022] Open
Abstract
Understanding genetic differentiation and speciation processes in marine species with high dispersal capabilities is challenging. The Chilean dolphin, Cephalorhynchus eutropia, is the only endemic cetacean of Chile and is found in two different coastal habitats: a northern habitat with exposed coastlines, bays and estuaries from Valparaíso (33°02′S) to Chiloé (42°00′S), and a southern habitat with highly fragmented inshore coastline, channels and fjords between Chiloé and Navarino Island (55°14′S). With the aim of evaluating the potential existence of conservation units for this species, we analyzed the genetic diversity and population structure of the Chilean dolphin along its entire range. We genotyped 21 dinucleotide microsatellites for 53 skin samples collected between 1998 and 2012 (swab: n = 8, biopsy: n = 38, entanglement n = 7). Bayesian clustering and spatial model analyses identified two genetically distinct populations corresponding to the northern and southern habitats. Genetic diversity levels were similar in the two populations (He: 0.42 v/s 0.45 for southern and northern populations, respectively), while effective size population was higher in the southern area (Ne: 101 v/s 39). Genetic differentiation between these two populations was high and significant (FST = 0.15 and RST = 0.19), indicating little or no current gene flow. Because of the absence of evident geographical barriers between the northern and southern populations, we propose that genetic differentiation may reflect ecological adaptation to the different habitat conditions and resource uses. Therefore, the two genetic populations of this endemic and Near Threatened species should be considered as different conservation units with independent management strategies.
Collapse
|
16
|
Evidence for distinct coastal and offshore communities of bottlenose dolphins in the north east Atlantic. PLoS One 2015; 10:e0122668. [PMID: 25853823 PMCID: PMC4390239 DOI: 10.1371/journal.pone.0122668] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2014] [Accepted: 02/24/2015] [Indexed: 11/24/2022] Open
Abstract
Bottlenose dolphin stock structure in the northeast Atlantic remains poorly understood. However, fine scale photo-id data have shown that populations can comprise multiple overlapping social communities. These social communities form structural elements of bottlenose dolphin (Tursiops truncatus) populations, reflecting specific ecological and behavioural adaptations to local habitats. We investigated the social structure of bottlenose dolphins in the waters of northwest Ireland and present evidence for distinct inshore and offshore social communities. Individuals of the inshore community had a coastal distribution restricted to waters within 3 km from shore. These animals exhibited a cohesive, fission-fusion social organisation, with repeated resightings within the research area, within a larger coastal home range. The offshore community comprised one or more distinct groups, found significantly further offshore (>4 km) than the inshore animals. In addition, dorsal fin scarring patterns differed significantly between inshore and offshore communities with individuals of the offshore community having more distinctly marked dorsal fins. Specifically, almost half of the individuals in the offshore community (48%) had characteristic stereotyped damage to the tip of the dorsal fin, rarely recorded in the inshore community (7%). We propose that this characteristic is likely due to interactions with pelagic fisheries. Social segregation and scarring differences found here indicate that the distinct communities are likely to be spatially and behaviourally segregated. Together with recent genetic evidence of distinct offshore and coastal population structures, this provides evidence for bottlenose dolphin inshore/offshore community differentiation in the northeast Atlantic. We recommend that social communities should be considered as fundamental units for the management and conservation of bottlenose dolphins and their habitat specialisations.
Collapse
|
17
|
Gridley T, Nastasi A, Kriesell H, Elwen S. The acoustic repertoire of wild common bottlenose dolphins (Tursiops truncatus) in Walvis Bay, Namibia. BIOACOUSTICS 2015. [DOI: 10.1080/09524622.2015.1014851] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- T. Gridley
- Mammal Research Institute, Department of Zoology and Entomology, University of Pretoria, Private Bag X20, Hatfield 0028, Gauteng, South Africa
- Namibian Dolphin Project, PO Box 5209, Walvis Bay, Erongo, Namibia
| | - A. Nastasi
- Namibian Dolphin Project, PO Box 5209, Walvis Bay, Erongo, Namibia
- Sapienza Università di Roma, Dipartimento di Scienze della Terra, Piazzale Aldo Moro 5, 00185Rome, Italy
| | - H.J. Kriesell
- Namibian Dolphin Project, PO Box 5209, Walvis Bay, Erongo, Namibia
- Centre Scientifique de Monaco (CSM), Départment de Biologie Polaire, LIA-647 BioSensib (CSM-CNRS-UdS), 8 Quai Antione Ier, 98000Monaco
| | - S.H. Elwen
- Mammal Research Institute, Department of Zoology and Entomology, University of Pretoria, Private Bag X20, Hatfield 0028, Gauteng, South Africa
- Namibian Dolphin Project, PO Box 5209, Walvis Bay, Erongo, Namibia
| |
Collapse
|
18
|
Drivers of Population Structure of the Bottlenose Dolphin (Tursiops truncatus) in the Eastern Mediterranean Sea. Evol Biol 2015. [DOI: 10.1007/s11692-015-9309-8] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
|
19
|
Dutton PH, Jensen MP, Frey A, LaCasella E, Balazs GH, Zárate P, Chassin-Noria O, Sarti-Martinez AL, Velez E. Population structure and phylogeography reveal pathways of colonization by a migratory marine reptile (Chelonia mydas) in the central and eastern Pacific. Ecol Evol 2014; 4:4317-31. [PMID: 25540693 PMCID: PMC4267870 DOI: 10.1002/ece3.1269] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2014] [Revised: 08/22/2014] [Accepted: 09/03/2014] [Indexed: 11/07/2022] Open
Abstract
Climate, behavior, ecology, and oceanography shape patterns of biodiversity in marine faunas in the absence of obvious geographic barriers. Marine turtles are an example of highly migratory creatures with deep evolutionary lineages and complex life histories that span both terrestrial and marine environments. Previous studies have focused on the deep isolation of evolutionary lineages (>3 mya) through vicariance; however, little attention has been given to the pathways of colonization of the eastern Pacific and the processes that have shaped diversity within the most recent evolutionary time. We sequenced 770 bp of the mtDNA control region to examine the stock structure and phylogeography of 545 green turtles from eight different rookeries in the central and eastern Pacific. We found significant differentiation between the geographically separated nesting populations and identified five distinct stocks (FST = 0.08–0.44, P < 0.005). Central and eastern Pacific Chelonia mydas form a monophyletic group containing 3 subclades, with Hawaii more closely related to the eastern Pacific than western Pacific populations. The split between sampled central/eastern and western Pacific haplotypes was estimated at around 0.34 mya, suggesting that the Pacific region west of Hawaii has been a more formidable barrier to gene flow in C. mydas than the East Pacific Barrier. Our results suggest that the eastern Pacific was colonized from the western Pacific via the Central North Pacific and that the Revillagigedos Islands provided a stepping-stone for radiation of green turtles from the Hawaiian Archipelago to the eastern Pacific. Our results fit with a broader paradigm that has been described for marine biodiversity, where oceanic islands, such as Hawaii and Revillagigedo, rather than being peripheral evolutionary “graveyards”, serve as sources and recipients of diversity and provide a mechanism for further radiation.
Collapse
Affiliation(s)
- Peter H Dutton
- Marine Mammal & Turtle Division, Southwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration 8901 La Jolla Shores Drive, La Jolla, California, 92037
| | - Michael P Jensen
- Marine Mammal & Turtle Division, Southwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration 8901 La Jolla Shores Drive, La Jolla, California, 92037
| | - Amy Frey
- Marine Mammal & Turtle Division, Southwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration 8901 La Jolla Shores Drive, La Jolla, California, 92037
| | - Erin LaCasella
- Marine Mammal & Turtle Division, Southwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration 8901 La Jolla Shores Drive, La Jolla, California, 92037
| | - George H Balazs
- Pacific Islands Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration 1845 Wasp Blvd., Honolulu, Hawaii, 96818
| | - Patricia Zárate
- Archie Carr Center for Sea Turtle Research and Department of Biology, University of Florida PO Box 118525, Gainesville, Florida, 32611
| | - Omar Chassin-Noria
- Facultad de Biología, Centro Multidisciplinario de Estudios en Biotecnología- UMSNH Morelia, Michoacán, 58030, México
| | - Adriana Laura Sarti-Martinez
- Dirección de Especies Prioritarias para la Conservación, CONANP Camino al Ajusco 200, 2° piso Ala Sur, Col. Jardines en la Montaña, México, DF, 14210, México
| | | |
Collapse
|
20
|
Valtonen M, Palo JU, Aspi J, Ruokonen M, Kunnasranta M, Nyman T. Causes and consequences of fine-scale population structure in a critically endangered freshwater seal. BMC Ecol 2014; 14:22. [PMID: 25005257 PMCID: PMC4106222 DOI: 10.1186/1472-6785-14-22] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2014] [Accepted: 07/03/2014] [Indexed: 11/10/2022] Open
Abstract
Background Small, genetically uniform populations may face an elevated risk of extinction due to reduced environmental adaptability and individual fitness. Fragmentation can intensify these genetic adversities and, therefore, dispersal and gene flow among subpopulations within an isolated population is often essential for maintaining its viability. Using microsatellite and mtDNA data, we examined genetic diversity, spatial differentiation, interregional gene flow, and effective population sizes in the critically endangered Saimaa ringed seal (Phoca hispida saimensis), which is endemic to the large but highly fragmented Lake Saimaa in southeastern Finland. Results Microsatellite diversity within the subspecies (HE = 0.36) ranks among the lowest thus far recorded within the order Pinnipedia, with signs of ongoing loss of individual heterozygosity, reflecting very low effective subpopulation sizes. Bayesian assignment analyses of the microsatellite data revealed clear genetic differentiation among the main breeding areas, but interregional structuring was substantially weaker in biparentally inherited microsatellites (FST = 0.107) than in maternally inherited mtDNA (FST = 0.444), indicating a sevenfold difference in the gene flow mediated by males versus females. Conclusions Genetic structuring in the population appears to arise from the joint effects of multiple factors, including small effective subpopulation sizes, a fragmented lacustrine habitat, and behavioural dispersal limitation. The fine-scale differentiation found in the landlocked Saimaa ringed seal is especially surprising when contrasted with marine ringed seals, which often exhibit near-panmixia among subpopulations separated by hundreds or even thousands of kilometres. Our results demonstrate that population structures of endangered animals cannot be predicted based on data on even closely related species or subspecies.
Collapse
Affiliation(s)
- Mia Valtonen
- Department of Biology, University of Eastern Finland, Joensuu, Finland.
| | | | | | | | | | | |
Collapse
|
21
|
Brown AM, Kopps AM, Allen SJ, Bejder L, Littleford-Colquhoun B, Parra GJ, Cagnazzi D, Thiele D, Palmer C, Frère CH. Population differentiation and hybridisation of Australian snubfin (Orcaella heinsohni) and Indo-Pacific humpback (Sousa chinensis) dolphins in north-western Australia. PLoS One 2014; 9:e101427. [PMID: 24988113 PMCID: PMC4079686 DOI: 10.1371/journal.pone.0101427] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2014] [Accepted: 06/06/2014] [Indexed: 12/02/2022] Open
Abstract
Little is known about the Australian snubfin (Orcaella heinsohni) and Indo-Pacific humpback (Sousa chinensis) dolphins (‘snubfin’ and ‘humpback dolphins’, hereafter) of north-western Australia. While both species are listed as ‘near threatened’ by the IUCN, data deficiencies are impeding rigorous assessment of their conservation status across Australia. Understanding the genetic structure of populations, including levels of gene flow among populations, is important for the assessment of conservation status and the effective management of a species. Using nuclear and mitochondrial DNA markers, we assessed population genetic diversity and differentiation between snubfin dolphins from Cygnet (n = 32) and Roebuck Bays (n = 25), and humpback dolphins from the Dampier Archipelago (n = 19) and the North West Cape (n = 18). All sampling locations were separated by geographic distances >200 km. For each species, we found significant genetic differentiation between sampling locations based on 12 (for snubfin dolphins) and 13 (for humpback dolphins) microsatellite loci (FST = 0.05–0.09; P<0.001) and a 422 bp sequence of the mitochondrial control region (FST = 0.50–0.70; P<0.001). The estimated proportion of migrants in a population ranged from 0.01 (95% CI 0.00–0.06) to 0.13 (0.03–0.24). These are the first estimates of genetic diversity and differentiation for snubfin and humpback dolphins in Western Australia, providing valuable information towards the assessment of their conservation status in this rapidly developing region. Our results suggest that north-western Australian snubfin and humpback dolphins may exist as metapopulations of small, largely isolated population fragments, and should be managed accordingly. Management plans should seek to maintain effective population size and gene flow. Additionally, while interactions of a socio-sexual nature between these two species have been observed previously, here we provide strong evidence for the first documented case of hybridisation between a female snubfin dolphin and a male humpback dolphin.
Collapse
Affiliation(s)
- Alexander M. Brown
- Murdoch University Cetacean Research Unit, School of Veterinary and Life Sciences, Murdoch University, Perth, Western Australia, Australia
- * E-mail:
| | - Anna M. Kopps
- Centre for Ecology and Conservation, University of Exeter, Penryn, Cornwall, United Kingdom
- Marine Evolution and Conservation, Centre for Ecological and Evolutionary Studies, University of Groningen, Groningen, The Netherlands
| | - Simon J. Allen
- Murdoch University Cetacean Research Unit, School of Veterinary and Life Sciences, Murdoch University, Perth, Western Australia, Australia
| | - Lars Bejder
- Murdoch University Cetacean Research Unit, School of Veterinary and Life Sciences, Murdoch University, Perth, Western Australia, Australia
| | | | - Guido J. Parra
- Cetacean Ecology, Behaviour and Evolution Lab, School of Biological Sciences, Flinders University, Adelaide, South Australia, Australia
- South Australian Research and Development Institute, Adelaide, South Australia, Australia
| | - Daniele Cagnazzi
- Marine Ecology Research Centre, School of Environment, Science and Engineering, Southern Cross University, Lismore, New South Wales, Australia
| | - Deborah Thiele
- Fenner School of Environment & Society, Australian National University, Canberra, Australian Capital Territory, Australia
| | - Carol Palmer
- Marine Ecosystems, Flora and Fauna Division, Department of Land Resource Management, Palmerston, Northern Territory, Australia
- Research Institute for the Environment and Livelihoods, Charles Darwin University, Darwin, Northern Territory, Australia
| | - Celine H. Frère
- GeneCology Research Centre, University of the Sunshine Coast, Maroochydore DC, Queensland, Australia
| |
Collapse
|
22
|
Fine scale population structure of dugongs (Dugong dugon) implies low gene flow along the southern Queensland coastline. CONSERV GENET 2014. [DOI: 10.1007/s10592-014-0624-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
23
|
Thompson KF, Ruggiero K, Millar CD, Constantine R, Helden AL. Large‐scale multivariate analysis reveals sexual dimorphism and geographic differences in the
G
ray's beaked whale. J Zool (1987) 2014. [DOI: 10.1111/jzo.12151] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- K. F. Thompson
- School of Biological Sciences University of Auckland Auckland New Zealand
- The Allan Wilson Centre for Molecular Ecology and Evolution School of Biological Sciences University of Auckland Auckland New Zealand
| | - K. Ruggiero
- Department of Statistics University of Auckland Auckland New Zealand
| | - C. D. Millar
- School of Biological Sciences University of Auckland Auckland New Zealand
- The Allan Wilson Centre for Molecular Ecology and Evolution School of Biological Sciences University of Auckland Auckland New Zealand
| | - R. Constantine
- School of Biological Sciences University of Auckland Auckland New Zealand
- Institute of Marine Science University of Auckland Auckland New Zealand
| | - A. L. Helden
- 20 Clunie Ave Raumati South 5032 Wellington New Zealand
| |
Collapse
|
24
|
Richards VP, Greig TW, Fair PA, McCulloch SD, Politz C, Natoli A, Driscoll CA, Hoelzel AR, David V, Bossart GD, Lopez JV. Patterns of population structure for inshore bottlenose dolphins along the eastern United States. ACTA ACUST UNITED AC 2014; 104:765-78. [PMID: 24129993 DOI: 10.1093/jhered/est070] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Globally distributed, the bottlenose dolphin (Tursiops truncatus) is found in a range of offshore and coastal habitats. Using 15 microsatellite loci and mtDNA control region sequences, we investigated patterns of genetic differentiation among putative populations along the eastern US shoreline (the Indian River Lagoon, Florida, and Charleston Harbor, South Carolina) (microsatellite analyses: n = 125, mtDNA analyses: n = 132). We further utilized the mtDNA to compare these populations with those from the Northwest Atlantic, Gulf of Mexico, and Caribbean. Results showed strong differentiation among inshore, alongshore, and offshore habitats (ФST = 0.744). In addition, Bayesian clustering analyses revealed the presence of 2 genetic clusters (populations) within the 250 km Indian River Lagoon. Habitat heterogeneity is likely an important force diversifying bottlenose dolphin populations through its influence on social behavior and foraging strategy. We propose that the spatial pattern of genetic variation within the lagoon reflects both its steep longitudinal transition of climate and also its historical discontinuity and recent connection as part of Intracoastal Waterway development. These findings have important management implications as they emphasize the role of habitat and the consequence of its modification in shaping bottlenose dolphin population structure and highlight the possibility of multiple management units existing in discrete inshore habitats along the entire eastern US shoreline.
Collapse
Affiliation(s)
- Vincent P Richards
- the Department of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
25
|
Remarkably low genetic diversity and strong population structure in common bottlenose dolphins (Tursiops truncatus) from coastal waters of the Southwestern Atlantic Ocean. CONSERV GENET 2014. [DOI: 10.1007/s10592-014-0586-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
26
|
Ansmann IC, Lanyon JM, Seddon JM, Parra GJ. Monitoring dolphins in an urban marine system: total and effective population size estimates of Indo-Pacific bottlenose dolphins in Moreton Bay, Australia. PLoS One 2013; 8:e65239. [PMID: 23755197 PMCID: PMC3670876 DOI: 10.1371/journal.pone.0065239] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2012] [Accepted: 04/25/2013] [Indexed: 11/25/2022] Open
Abstract
Moreton Bay, Queensland, Australia is an area of high biodiversity and conservation value and home to two sympatric sub-populations of Indo-Pacific bottlenose dolphins (Tursiops aduncus). These dolphins live in close proximity to major urban developments. Successful management requires information regarding their abundance. Here, we estimate total and effective population sizes of bottlenose dolphins in Moreton Bay using photo-identification and genetic data collected during boat-based surveys in 2008–2010. Abundance (N) was estimated using open population mark-recapture models based on sighting histories of distinctive individuals. Effective population size (Ne) was estimated using the linkage disequilibrium method based on nuclear genetic data at 20 microsatellite markers in skin samples, and corrected for bias caused by overlapping generations (Nec). A total of 174 sightings of dolphin groups were recorded and 365 different individuals identified. Over the whole of Moreton Bay, a population size N of 554±22.2 (SE) (95% CI: 510–598) was estimated. The southern bay sub-population was small at an estimated N = 193±6.4 (SE) (95% CI: 181–207), while the North sub-population was more numerous, with 446±56 (SE) (95% CI: 336–556) individuals. The small estimated effective population size of the southern sub-population (Nec = 56, 95% CI: 33–128) raises conservation concerns. A power analysis suggested that to reliably detect small (5%) declines in size of this population would require substantial survey effort (>4 years of annual mark-recapture surveys) at the precision levels achieved here. To ensure that ecological as well as genetic diversity within this population of bottlenose dolphins is preserved, we consider that North and South sub-populations should be treated as separate management units. Systematic surveys over smaller areas holding locally-adapted sub-populations are suggested as an alternative method for increasing ability to detect abundance trends.
Collapse
Affiliation(s)
- Ina C Ansmann
- Marine Vertebrate Ecology Research Group, School of Biological Sciences, The University of Queensland, St Lucia, Queensland, Australia.
| | | | | | | |
Collapse
|