1
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Mull CG, Pennell MW, Yopak KE, Dulvy NK. Maternal investment evolves with larger body size and higher diversification rate in sharks and rays. Curr Biol 2024; 34:2773-2781.e3. [PMID: 38843829 DOI: 10.1016/j.cub.2024.05.019] [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: 08/11/2023] [Revised: 12/19/2023] [Accepted: 05/10/2024] [Indexed: 06/13/2024]
Abstract
Across vertebrates, live bearing evolved at least 150 times from ancestral egg laying into diverse forms and degrees of prepartum maternal investment.1,2 A key question is how reproductive diversity arose and whether reproductive diversification underlies species diversification.3,4,5,6,7,8,9,10,11 To test this, we evaluate the most basal jawed vertebrates: the sharks, rays, and chimaeras, which have one of the greatest ranges of reproductive and ecological diversity among vertebrates.2,12 We reconstruct the sequence of reproductive mode evolution across a phylogeny of 610 chondrichthyans.13 We reveal egg laying as ancestral, with live bearing evolving at least seven times. Matrotrophy evolved at least 15 times, with evidence of one reversal. In sharks, transitions to live bearing and matrotrophy are more prevalent in larger-bodied tropical species. Further, the evolution of live bearing is associated with a near doubling of the diversification rate, but there is only a small increase associated with the appearance of matrotrophy. Although pre-copulatory sexual selection is associated with increased rates of speciation in teleosts,3 sexual size dimorphism in chondrichthyans does not appear to be related to sexual selection,14,15 and instead we find increased rates of speciation associated with the colonization of novel habitats. This highlights a potential key difference between chondrichthyans and other fishes, specifically a slower rate of evolution of reproductive isolation following speciation, suggesting different rate-limiting mechanisms for diversification between these clades.16 The chondrichthyan diversification and radiation, particularly throughout shallow tropical shelf seas and oceanic pelagic habitats, appear to be associated with the evolution of live bearing and proliferation of a wide range of maternal investment in developing offspring.
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Affiliation(s)
- Christopher G Mull
- Earth to Ocean Research Group, Department of Biological Sciences, Simon Fraser University, Burnaby, BC V5A 1S6, Canada; Integrated Fisheries Lab, Department of Biology, Dalhousie University, Halifax, NS B3H 4R2, Canada.
| | - Matthew W Pennell
- Department of Quantitative and Computational Biology, University of Southern California, Los Angeles, CA 90007, USA
| | - Kara E Yopak
- Department of Biology and Marine Biology and UNCW Center for Marine Science, University of North Carolina Wilmington, Wilmington, NC 28403, USA
| | - Nicholas K Dulvy
- Earth to Ocean Research Group, Department of Biological Sciences, Simon Fraser University, Burnaby, BC V5A 1S6, Canada
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2
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Ferrari A, Crobe V, Cannas R, Leslie RW, Serena F, Stagioni M, Costa FO, Golani D, Hemida F, Zaera-Perez D, Sion L, Carbonara P, Fiorentino F, Tinti F, Cariani A. To Be, or Not to Be: That Is the Hamletic Question of Cryptic Evolution in the Eastern Atlantic and Mediterranean Raja miraletus Species Complex. Animals (Basel) 2023; 13:2139. [PMID: 37443937 DOI: 10.3390/ani13132139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 06/25/2023] [Accepted: 06/25/2023] [Indexed: 07/15/2023] Open
Abstract
Despite a high species diversity, skates (Rajiformes) exhibit remarkably conservative morphology and ecology. Limited trait variations occur within and between species, and cryptic species have been reported among sister and non-sister taxa, suggesting that species complexes may be subject to stabilising selection. Three sibling species are currently recognised in the Raja miraletus complex: (i) R. miraletus occurring along the Portuguese and Mediterranean coasts, (ii) R. parva in the Central-Eastern Atlantic off West Africa and (iii) R. ocellifera in the Western Indian Ocean off South Africa. In the present study, the genetic variation at mitochondrial and nuclear markers was estimated in the species complex by analysing 323 individuals sampled across most of its geographical distribution area to test the hypothesis that restricted gene flow and genetic divergence within species reflect known climate and bio-oceanographic discontinuities. Our results support previous morphological studies and confirm the known taxonomic boundaries of the three recognised species. In addition, we identified multiple weakly differentiated clades in the Northeastern Atlantic Ocean and Mediterranean, at least two additional cryptic taxa off Senegal and Angola, a pronounced differentiation of ancient South African clades. The hidden genetic structure presented here may represent a valuable support to species' conservation action plans.
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Affiliation(s)
- Alice Ferrari
- Department of Biological, Geological and Environmental Sciences, University of Bologna, 40126 Bologna, Italy
| | - Valentina Crobe
- Department of Biological, Geological and Environmental Sciences, University of Bologna, 40126 Bologna, Italy
| | - Rita Cannas
- Department of Life and Environmental Sciences, University of Cagliari, 09126 Cagliari, Italy
| | - Rob W Leslie
- Branch Fisheries Management, Department Agriculture, Forestry and Fisheries, Cape Town 8018, South Africa
| | - Fabrizio Serena
- Institute for Biological Resources and Marine Biotechnology, National Research Council, 91026 Trapani, Italy
| | - Marco Stagioni
- Laboratory of Marine Biology and Fisheries, Department Biological, Geological and Environmental Sciences, University of Bologna, 61032 Fano, Italy
| | - Filipe O Costa
- Centre of Molecular and Environmental Biology (CBMA) and ARNET-Aquatic Research Network, Department of Biology, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal
| | - Daniel Golani
- Department of Evolution, Systematics and Ecology, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel
| | - Farid Hemida
- Ecole Nationale Supérieure des Sciences de la Mer et de l'Aménagement du Littoral, Campus Universitaire de Dely Ibrahim, Algiers 16320, Algeria
| | | | - Letizia Sion
- Department of Biosciences, Biotechnologies and Environment, University of Bari Aldo Moro, 70125 Bari, Italy
| | | | - Fabio Fiorentino
- Institute for Biological Resources and Marine Biotechnology, National Research Council, 91026 Trapani, Italy
- Stazione Zoologica Anton Dohrn, 90149 Palermo, Italy
| | - Fausto Tinti
- Department of Biological, Geological and Environmental Sciences, University of Bologna, 40126 Bologna, Italy
| | - Alessia Cariani
- Department of Biological, Geological and Environmental Sciences, University of Bologna, 40126 Bologna, Italy
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3
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Gonzalez C, Postaire B, Domingues RR, Feldheim KA, Caballero S, Chapman D. Phylogeography and population genetics of the cryptic bonnethead shark Sphyrna aff. tiburo in Brazil and the Caribbean inferred from mtDNA markers. JOURNAL OF FISH BIOLOGY 2021; 99:1899-1911. [PMID: 34476811 DOI: 10.1111/jfb.14896] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Revised: 08/19/2021] [Accepted: 08/30/2021] [Indexed: 06/13/2023]
Abstract
Resolving the identity, phylogeny and distribution of cryptic species within species complexes is an essential precursor to management. The bonnethead shark, Sphyrna tiburo, is a small coastal shark distributed in the Western Atlantic from North Carolina (U.S.A.) to southern Brazil. Genetic analyses based on mitochondrial markers revealed that bonnethead sharks comprise a species complex with at least two lineages in the Northwestern Atlantic and the Caribbean (S. tiburo and Sphyrna aff. tiburo, respectively). The phylogeographic and phylogenetic analysis of two mitochondrial markers [control region (mtCR) and cytochrome oxidase I (COI)] showed that bonnethead sharks from southeastern Brazil correspond to S. aff. tiburo, extending the distribution of this cryptic species >5000 km. Bonnethead shark populations are only managed in the U.S.A. and in the 2000s were considered to be regionally extinct or collapsed in southeast Brazil. The results indicate that there is significant genetic differentiation between S. aff. tiburo from Brazil and other populations from the Caribbean (ΦST = 0.9053, P < 0.000), which means that collapsed populations in the former are unlikely to be replenished from Caribbean immigration. The species identity of bonnethead sharks in the Southwest Atlantic and their relationship to North Atlantic and Caribbean populations still remains unresolved. Taxonomic revision and further sampling are required to reevaluate the status of the bonnethead shark complex through its distribution range.
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Affiliation(s)
- Cindy Gonzalez
- Predator Ecology and Conservation Lab, Biological Sciences Department, Florida International University, Miami, Florida, 33181, USA
| | - Bautisse Postaire
- Predator Ecology and Conservation Lab, Biological Sciences Department, Florida International University, Miami, Florida, 33181, USA
| | - Rodrigo R Domingues
- Departamento de Ciências do Mar, Universidade Federal de São Paulo, Instituto do Mar, São Paulo, Brazil
| | - Kevin A Feldheim
- Pritzker Laboratory for Molecular Systematics and Evolution, Field Museum of Natural History, Chicago, Illinois, USA
| | - Susana Caballero
- Laboratorio de Ecología Molecular de Vertebrados Acuáticos, Departamento de Ciencias Biológicas, Universidad de Los Andes, Bogotá, Colombia
| | - Demian Chapman
- Predator Ecology and Conservation Lab, Biological Sciences Department, Florida International University, Miami, Florida, 33181, USA
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4
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Aguirre‐Sarabia I, Díaz‐Arce N, Pereda‐Agirre I, Mendibil I, Urtizberea A, Gerritsen HD, Burns F, Holmes I, Landa J, Coscia I, Quincoces I, Santurtún M, Zanzi A, Martinsohn JT, Rodríguez‐Ezpeleta N. Evidence of stock connectivity, hybridization, and misidentification in white anglerfish supports the need of a genetics-informed fisheries management framework. Evol Appl 2021; 14:2221-2230. [PMID: 34603494 PMCID: PMC8477593 DOI: 10.1111/eva.13278] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2021] [Revised: 06/29/2021] [Accepted: 07/02/2021] [Indexed: 11/27/2022] Open
Abstract
Understanding population connectivity within a species as well as potential interactions with its close relatives is crucial to define management units and to derive efficient management actions. However, although genetics can reveal mismatches between biological and management units and other relevant but hidden information such as species misidentification or hybridization, the uptake of genetic methods by the fisheries management process is far from having been consolidated. Here, we have assessed the power of genetics to better understand the population connectivity of white (Lophius piscatorius) and its interaction with its sister species, the black anglerfish (Lophius budegassa). Our analyses, based on thousands of genome-wide single nucleotide polymorphisms, show three findings that are crucial for white anglerfish management. We found (i) that white anglerfish is likely composed of a single panmictic population throughout the Northeast Atlantic, challenging the three-stock based management, (ii) that a fraction of specimens classified as white anglerfish using morphological characteristics are genetically identified as black anglerfish (L. budegassa), and iii) that the two Lophius species naturally hybridize leading to a population of hybrids of up to 20% in certain areas. Our results set the basics for a genetics-informed white anglerfish assessment framework that accounts for stock connectivity, revises and establishes new diagnostic characters for Lophius species identification, and evaluates the effect of hybrids in the current and future assessments of the white anglerfish. Furthermore, our study contributes to provide additional evidence of the potentially negative consequences of ignoring genetic data for assessing fisheries resources.
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Affiliation(s)
- Imanol Aguirre‐Sarabia
- Marine ResearchAZTI Basque Research and Technology Alliance (BRTA)SukarrietaBizkaiaSpain
| | - Natalia Díaz‐Arce
- Marine ResearchAZTI Basque Research and Technology Alliance (BRTA)SukarrietaBizkaiaSpain
| | - Iker Pereda‐Agirre
- Marine ResearchAZTI Basque Research and Technology Alliance (BRTA)SukarrietaBizkaiaSpain
| | - Iñaki Mendibil
- Marine ResearchAZTI Basque Research and Technology Alliance (BRTA)SukarrietaBizkaiaSpain
| | - Agurtzane Urtizberea
- Marine ResearchAZTI Basque Research and Technology Alliance (BRTA)SukarrietaBizkaiaSpain
| | | | - Finlay Burns
- Marine LaboratoryMarine Scotland ScienceAberdeenshireUK
| | - Ian Holmes
- Lowestoft LaboratoryCentre for Environment, Fisheries and Aquaculture ScienceLowestoftSuffolkUK
| | - Jorge Landa
- Centro Oceanográfico de SantanderInstituto Español de Oceanografía (IEO)SantanderSpain
| | - Ilaria Coscia
- School of Science, Engineering and EnvironmentUniversity of SalfordSalfordUK
| | - Iñaki Quincoces
- Marine ResearchAZTI Basque Research and Technology Alliance (BRTA)SukarrietaBizkaiaSpain
| | - Marina Santurtún
- Marine ResearchAZTI Basque Research and Technology Alliance (BRTA)SukarrietaBizkaiaSpain
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5
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Kraft D, Meyer L, Webb M, Scidmore-Rossing K, Huveneers C, Clua E, Meyer C. Development and successful real-world use of a transfer DNA technique to identify species involved in shark bite incidents. J Forensic Sci 2021; 66:2438-2443. [PMID: 34286850 DOI: 10.1111/1556-4029.14808] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2020] [Revised: 06/30/2021] [Accepted: 07/07/2021] [Indexed: 11/30/2022]
Abstract
Identifying the species involved in shark bite incidents is an ongoing challenge but is important to mitigate risk. We developed a sampling protocol to identify shark species from DNA transferred to inanimate objects during bite incidents. To develop and refine the technique, we swabbed shark bite impressions on surfboards and wetsuit neoprene collected under semicontrolled conditions. Methods were tested experimentally and then successfully used to identify the species involved in a real-world shark bite incident. Thirty-two of 33 bite impressions yielded sufficient DNA sequences for species identification, producing barcodes from five test species, including dusky, Galapagos, bull, tiger, and white shark. The latter three species collectively account for a majority of shark bites worldwide. Our method successfully identified the species (Galeocerdo cuvier) responsible for a fatal shark bite on December 8th, 2020 on the island of Maui, from swab samples collected from the victim's surfboard 49 h after the bite incident. Our experimental results demonstrate that shark species can be accurately identified from transfer DNA recovered from bite impressions on surfboards and wetsuit neoprene. The successful use of our method in the real-world incident shows great potential for the practicality of this tool. We recommend DNA swabbing as a routine part of the forensic analysis of shark bites to help identify the species involved in human-shark interactions.
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Affiliation(s)
- Derek Kraft
- Hawaii Institute of Marine Biology, Kaneohe, Hawaii, USA
| | - Lauren Meyer
- Southern Shark Ecology Group, College of Science and Engineering, Flinders University, Adelaide, SA, Australia.,The Georgia Aquarium, Atlanta, Georgia, USA
| | - Maryann Webb
- Hawaii Institute of Marine Biology, Kaneohe, Hawaii, USA
| | | | - Charlie Huveneers
- Southern Shark Ecology Group, College of Science and Engineering, Flinders University, Adelaide, SA, Australia
| | - Eric Clua
- Laboratoire d'excellence CORAIL, CRIOBE USR3278 EPHE-CNRS-UPVD, EPHE, PSL Research University, Perpignan, France
| | - Carl Meyer
- Hawaii Institute of Marine Biology, Kaneohe, Hawaii, USA
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6
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Sangster G, Luksenburg JA. The published complete mitochondrial genome of the milk shark ( Rhizoprionodon acutus) is a misidentified Pacific spadenose shark ( Scoliodon macrorhynchos) (Chondrichthyes: Carcharhiniformes). Mitochondrial DNA B Resour 2021; 6:828-830. [PMID: 33763593 PMCID: PMC7954409 DOI: 10.1080/23802359.2021.1884019] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
The recently published mitogenome of milk shark Rhizoprionodon acutus (MN602076/NC_046016) was fully resolved in an unexpected phylogenetic position in the original mitogenome announcement, which rendered the genus Scoliodon paraphyletic. Here, we show that this mitogenome is actually that of a misidentified Pacific spadenose shark (Scoliodon macrorhynchos). The error is documented to avoid the perpetuation of erroneous sequence information in the literature.
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Affiliation(s)
| | - Jolanda A Luksenburg
- Institute of Environmental Sciences, Leiden University, Leiden, The Netherlands.,Department of Environmental Science and Policy, George Mason University, Fairfax, VA, USA
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7
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Introgressive hybridisation between two widespread sharks in the east Pacific region. Mol Phylogenet Evol 2019; 136:119-127. [DOI: 10.1016/j.ympev.2019.04.013] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2018] [Revised: 03/27/2019] [Accepted: 04/10/2019] [Indexed: 11/21/2022]
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8
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Barker AM, Adams DH, Driggers WB, Frazier BS, Portnoy DS. Hybridization between sympatric hammerhead sharks in the western North Atlantic Ocean. Biol Lett 2019; 15:20190004. [PMID: 30940019 DOI: 10.1098/rsbl.2019.0004] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Hybridization between closely related species has been documented across a wide range of taxa but has not been well studied in elasmobranchs. Hammerhead sharks have drawn global conservation concern because they experience some of the highest mortality rates among sharks when interacting with fisheries. Here we report on the detection of hybrids between the globally distributed scalloped hammerhead ( Sphyrna lewini) and recently described Carolina hammerhead ( S. gilberti) which are only known from the western Atlantic Ocean. Using a genomics approach, 10 first-generation hybrids and 15-17 backcrosses were detected from 554 individuals. The identification of backcrosses demonstrates hybrids are viable, and all backcrosses but one involved a scalloped hammerhead. All hybrids but one possessed Carolina hammerhead mtDNA, indicating sex-biased gene flow between species. Repeated hybridization and backcrossing with scalloped hammerheads could lead to the loss of endemic Carolina hammerheads.
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Affiliation(s)
- Amanda M Barker
- 1 Marine Genomics Laboratory, Department of Life Sciences, Texas A&M University-Corpus Christi , Corpus Christi, TX , USA
| | - Douglas H Adams
- 2 Florida Fish and Wildlife Conservation Commission, Fish and Wildlife Research Institute , Melbourne, FL , USA
| | - William B Driggers
- 3 Southeast Fisheries Science Center, National Marine Fisheries Service, NOAA , Pascagoula, MS , USA
| | - Bryan S Frazier
- 4 South Carolina Department of Natural Resources , Charleston, SC , USA
| | - David S Portnoy
- 1 Marine Genomics Laboratory, Department of Life Sciences, Texas A&M University-Corpus Christi , Corpus Christi, TX , USA
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9
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Taking Advantage of the Genomics Revolution for Monitoring and Conservation of Chondrichthyan Populations. DIVERSITY-BASEL 2019. [DOI: 10.3390/d11040049] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Chondrichthyes (sharks, rays, skates and chimaeras) are among the oldest extant predators and are vital to top-down regulation of oceanic ecosystems. They are an ecologically diverse group occupying a wide range of habitats and are thus, exploited by coastal, pelagic and deep-water fishing industries. Chondrichthyes are among the most data deficient vertebrate species groups making design and implementation of regulatory and conservation measures challenging. High-throughput sequencing technologies have significantly propelled ecological investigations and understanding of marine and terrestrial species’ populations, but there remains a paucity of NGS based research on chondrichthyan populations. We present a brief review of current methods to access genomic and metagenomic data from Chondrichthyes and discuss applications of these datasets to increase our understanding of chondrichthyan taxonomy, evolution, ecology and population structures. Last, we consider opportunities and challenges offered by genomic studies for conservation and management of chondrichthyan populations.
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10
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Fotedar S, Lukehurst S, Jackson G, Snow M. Molecular tools for identification of shark species involved in depredation incidents in Western Australian fisheries. PLoS One 2019; 14:e0210500. [PMID: 30633772 PMCID: PMC6329513 DOI: 10.1371/journal.pone.0210500] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2018] [Accepted: 12/23/2018] [Indexed: 11/19/2022] Open
Abstract
Shark depredation is an issue of concern in some Western Australian recreational and commercial fisheries where it can have economic, social and ecological consequences. Knowledge of the shark species involved is fundamental to developing effective management strategies to mitigate the impacts of depredation. Identification of the species responsible is difficult as direct observation of depredation events is uncommon and evaluating bite marks on fish has a high degree of uncertainty. The use of trace DNA techniques has provided an alternative method for species identification. We demonstrate proof of concept for a targeted DNA barcoding approach to identify shark species using trace DNA found at bite marks on recovered remains of hooked fish. Following laboratory validation, forensic analysis of swabs collected from samples of bitten demersal fish, led to the definitive identification of shark species involved in 100% of the incidences of depredation (n = 16).
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Affiliation(s)
- Seema Fotedar
- Department of Primary Industries and Regional Development, Government of Western Australia, Hillarys, Western Australia, Australia
- * E-mail:
| | - Sherralee Lukehurst
- Department of Primary Industries and Regional Development, Government of Western Australia, Hillarys, Western Australia, Australia
- Centre for Evolutionary Biology, School of Biological Sciences, The University of Western Australia, Crawley, Western Australia, Australia
| | - Gary Jackson
- Department of Primary Industries and Regional Development, Government of Western Australia, Hillarys, Western Australia, Australia
| | - Michael Snow
- Department of Primary Industries and Regional Development, Government of Western Australia, Hillarys, Western Australia, Australia
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11
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Kolmann MA, Elbassiouny AA, Liverpool EA, Lovejoy NR. DNA barcoding reveals the diversity of sharks in Guyana coastal markets. NEOTROPICAL ICHTHYOLOGY 2017. [DOI: 10.1590/1982-0224-20170097] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/30/2023]
Abstract
ABSTRACT A fundamental challenge for both sustainable fisheries and biodiversity protection in the Neotropics is the accurate determination of species identity. The biodiversity of the coastal sharks of Guyana is poorly understood, but these species are subject to both artisanal fishing as well as harvesting by industrialized offshore fleets. To determine what species of sharks are frequently caught and consumed along the coastline of Guyana, we used DNA barcoding to identify market specimens. We sequenced the mitochondrial co1 gene for 132 samples collected from six markets, and compared our sequences to those available in the Barcode of Life Database (BOLD) and GenBank. Nearly 30% of the total sample diversity was represented by two species of Hammerhead Sharks (Sphyrna mokarran and S. lewini), both listed as Endangered by the International Union for Conservation of Nature (IUCN). Other significant portions of the samples included Sharpnose Sharks (23% - Rhizoprionodon spp.), considered Vulnerable in Brazilian waters due to unregulated gillnet fisheries, and the Smalltail Shark (17% - Carcharhinus porosus). We found that barcoding provides efficient and accurate identification of market specimens in Guyana, making this study the first in over thirty years to address Guyana’s coastal shark biodiversity.
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12
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Walter RP, Roy D, Hussey NE, Stelbrink B, Kovacs KM, Lydersen C, McMeans BC, Svavarsson J, Kessel ST, Biton Porsmoguer S, Wildes S, Tribuzio CA, Campana SE, Petersen SD, Grubbs RD, Heath DD, Hedges KJ, Fisk AT. Origins of the Greenland shark ( Somniosus microcephalus): Impacts of ice-olation and introgression. Ecol Evol 2017; 7:8113-8125. [PMID: 29043060 PMCID: PMC5632604 DOI: 10.1002/ece3.3325] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2017] [Revised: 06/07/2017] [Accepted: 07/21/2017] [Indexed: 12/04/2022] Open
Abstract
Herein, we use genetic data from 277 sleeper sharks to perform coalescent‐based modeling to test the hypothesis of early Quaternary emergence of the Greenland shark (Somniosus microcephalus) from ancestral sleeper sharks in the Canadian Arctic‐Subarctic region. Our results show that morphologically cryptic somniosids S. microcephalus and Somniosus pacificus can be genetically distinguished using combined mitochondrial and nuclear DNA markers. Our data confirm the presence of genetically admixed individuals in the Canadian Arctic and sub‐Arctic, and temperate Eastern Atlantic regions, suggesting introgressive hybridization upon secondary contact following the initial species divergence. Conservative substitution rates fitted to an Isolation with Migration (IM) model indicate a likely species divergence time of 2.34 Ma, using the mitochondrial sequence DNA, which in conjunction with the geographic distribution of admixtures and Pacific signatures likely indicates speciation associated with processes other than the closing of the Isthmus of Panama. This time span coincides with further planetary cooling in the early Quaternary period followed by the onset of oscillating glacial‐interglacial cycles. We propose that the initial S. microcephalus–S. pacificus split, and subsequent hybridization events, were likely associated with the onset of Pleistocene glacial oscillations, whereby fluctuating sea levels constrained connectivity among Arctic oceanic basins, Arctic marginal seas, and the North Atlantic Ocean. Our data demonstrates support for the evolutionary consequences of oscillatory vicariance via transient oceanic isolation with subsequent secondary contact associated with fluctuating sea levels throughout the Quaternary period—which may serve as a model for the origins of Arctic marine fauna on a broad taxonomic scale.
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Affiliation(s)
- Ryan P Walter
- Department of Biological Science California State University Fullerton CA USA.,Great Lakes Institute for Environmental Research University of Windsor Windsor ON Canada
| | - Denis Roy
- Department of Natural Resources and the Environment Wildlife and Fisheries Conservation Center and Center for Environmental Sciences and Engineering University of Connecticut Storrs CT USA
| | - Nigel E Hussey
- Biological Sciences University of Windsor Windsor ON Canada
| | | | - Kit M Kovacs
- Fram Centre Norwegian Polar Institute Tromsø Norway
| | | | - Bailey C McMeans
- Great Lakes Institute for Environmental Research University of Windsor Windsor ON Canada.,Department of Biology University of Toronto Mississauga Mississauga ON Canada
| | - Jörundur Svavarsson
- Faculty of Life and Environmental Sciences University of Iceland Reykjavík Iceland
| | - Steven T Kessel
- Department of Fisheries and Wildlife Michigan State University East Lansing MI USA
| | - Sebastián Biton Porsmoguer
- Mediterranean Institute of Oceanography (MIO) UM 110 Aix-Marseille University CNRS/INSU Toulon University IRD Marseille France
| | - Sharon Wildes
- Auke Bay Laboratories AFSC/NMFS/NOAA/DOC Ted Stevens Marine Research Institute Juneau AK USA
| | - Cindy A Tribuzio
- Auke Bay Laboratories AFSC/NMFS/NOAA/DOC Ted Stevens Marine Research Institute Juneau AK USA
| | - Steven E Campana
- Faculty of Life and Environmental Sciences University of Iceland Reykjavík Iceland
| | - Stephen D Petersen
- Conservation and Research Department Assiniboine Park Zoo Winnipeg MB Canada
| | - R Dean Grubbs
- Coastal and Marine Laboratory Florida State University St. Teresa FL USA
| | - Daniel D Heath
- Great Lakes Institute for Environmental Research University of Windsor Windsor ON Canada
| | - Kevin J Hedges
- Arctic Aquatic Research Division Fisheries and Oceans Canada Winnipeg MB Canada
| | - Aaron T Fisk
- Great Lakes Institute for Environmental Research University of Windsor Windsor ON Canada
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13
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Johnson GJ, Buckworth RC, Lee H, Morgan JAT, Ovenden JR, McMahon CR. A novel field method to distinguish between cryptic carcharhinid sharks, Australian blacktip shark Carcharhinus tilstoni and common blacktip shark C. limbatus, despite the presence of hybrids. JOURNAL OF FISH BIOLOGY 2017; 90:39-60. [PMID: 27774596 DOI: 10.1111/jfb.13102] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2015] [Accepted: 07/04/2016] [Indexed: 06/06/2023]
Abstract
Multivariate and machine-learning methods were used to develop field identification techniques for two species of cryptic blacktip shark. From 112 specimens, precaudal vertebrae (PCV) counts and molecular analysis identified 95 Australian blacktip sharks Carcharhinus tilstoni and 17 common blacktip sharks Carcharhinus limbatus. Molecular analysis also revealed 27 of the 112 were C. tilstoni × C. limbatus hybrids, of which 23 had C. tilstoni PCV counts and four had C. limbatus PCV counts. In the absence of further information about hybrid phenotypes, hybrids were assigned as either C. limbatus or C. tilstoni based on PCV counts. Discriminant analysis achieved 80% successful identification, but machine-learning models were better, achieving 100% successful identification, using six key measurements (fork length, caudal-fin peduncle height, interdorsal space, second dorsal-fin height, pelvic-fin length and pelvic-fin midpoint to first dorsal-fin insertion). Furthermore, pelvic-fin markings could be used for identification: C. limbatus has a distinct black mark >3% of the total pelvic-fin area, while C. tilstoni has markings with diffuse edges, or has smaller or no markings. Machine learning and pelvic-fin marking identification methods were field tested achieving 87 and 90% successful identification, respectively. With further refinement, the techniques developed here will form an important part of a multi-faceted approach to identification of C. tilstoni and C. limbatus and have a clear management and conservation application to these commercially important sharks. The methods developed here are broadly applicable and can be used to resolve species identities in many fisheries where cryptic species exist.
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Affiliation(s)
- G J Johnson
- Department of Primary Industry and Fisheries, Aquatic Resource Research Unit, G. P. O Box 3000, Darwin, NT, 0801, Australia
| | - R C Buckworth
- CSIRO Oceans and Atmosphere Flagship, PMB 44 Winnellie, Darwin, NT, 0822, Australia
| | - H Lee
- Department of Primary Industry and Fisheries, Aquatic Resource Research Unit, G. P. O Box 3000, Darwin, NT, 0801, Australia
| | - J A T Morgan
- Queensland Alliance for Agriculture & Food Innovation, Centre for Animal Science, P. O. Box 6097, The University of Queensland, St Lucia, QLD, 4072, Australia
| | - J R Ovenden
- Molecular Fisheries Laboratory, School of Biomedical Sciences, The University of Queensland, St Lucia, QLD, 4072, Australia
| | - C R McMahon
- Sydney Institute of Marine Science, 19 Chowder Bay Road, Mosman, NSW, 2088, Australia
- Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, TAS, 2001, Australia
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Fields AT, Feldheim KA, Gelsleichter J, Pfoertner C, Chapman DD. Population structure and cryptic speciation in bonnethead sharks Sphyrna tiburo in the south-eastern U.S.A. and Caribbean. JOURNAL OF FISH BIOLOGY 2016; 89:2219-2233. [PMID: 27600497 DOI: 10.1111/jfb.13025] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2015] [Accepted: 04/11/2016] [Indexed: 06/06/2023]
Abstract
Population structure and lineage diversification within a small, non-dispersive hammerhead shark species, the bonnethead shark Sphyrna tiburo, was assessed. Sphyrna tiburo is currently described as one continuously distributed species along the Atlantic continental margins of North, Central and South America, but recent genetic analysis of an insular population (Trinidad) suggests the possibility of cryptic speciation. To address this issue S. tiburo were sampled at six sites along c. 6200 km of continuous, continental coastline and from one island location (Grand Bahama) across a discontinuity in their distribution (the Straits of Florida), in order to test if they constitute a single lineage over this distribution. A total of 1030 bp of the mitochondrial control region (CR) was obtained for 239 S. tiburo, revealing 73 distinct haplotypes, high nucleotide diversity (0·01089) and a pair of highly divergent lineages estimated to have separated 3·61-5·62 million years ago. Mitochondrial cytochrome oxidase I and nuclear internal transcribed spacer loci show the same pattern. Divergence is similar within S. tiburo to that observed between established elasmobranch sister species, providing further evidence of cryptic speciation. A global AMOVA based on CR confirms that genetic diversity is primarily partitioned among populations (ΦST = 0·828, P < 0·001) because the divergent lineages are almost perfectly segregated between Belize and North America-The Bahamas. An AMOVA consisting solely of the North American and Bahamian samples is also significantly different from zero (ΦST = 0·088, P < 0·001) and pairwise FST is significantly different between all sites. These findings suggest that S. tiburo comprises a species complex and supports previous research indicating fine population structure, which has implications for fisheries management and biodiversity conservation.
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Affiliation(s)
- A T Fields
- School of Marine and Atmospheric Science, Stony Brook University, Stony Brook, NY, 11794, U.S.A..
| | - K A Feldheim
- Pritzker Laboratory for Molecular Systematics and Evolution, Field Museum of Natural History, 1400 South Lake Shore Drive, Chicago, IL, 60605, U.S.A
| | - J Gelsleichter
- Department of Biology, University of North Florida, 1 UNF Drive, Jacksonville, FL, 32224, U.S.A
| | - C Pfoertner
- School of Marine and Atmospheric Science, Stony Brook University, Stony Brook, NY, 11794, U.S.A
| | - D D Chapman
- School of Marine and Atmospheric Science, Stony Brook University, Stony Brook, NY, 11794, U.S.A
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15
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Meyer L, Capper A, Carter S, Simpfendorfer C. An investigation into ciguatoxin bioaccumulation in sharks. Toxicon 2016; 119:234-43. [DOI: 10.1016/j.toxicon.2016.06.007] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2015] [Revised: 05/26/2016] [Accepted: 06/07/2016] [Indexed: 12/01/2022]
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16
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Smart JJ, Chin A, Baje L, Green ME, Appleyard SA, Tobin AJ, Simpfendorfer CA, White WT. Effects of Including Misidentified Sharks in Life History Analyses: A Case Study on the Grey Reef Shark Carcharhinus amblyrhynchos from Papua New Guinea. PLoS One 2016; 11:e0153116. [PMID: 27058734 PMCID: PMC4825934 DOI: 10.1371/journal.pone.0153116] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Accepted: 03/23/2016] [Indexed: 11/18/2022] Open
Abstract
Fisheries observer programs are used around the world to collect crucial information and samples that inform fisheries management. However, observer error may misidentify similar-looking shark species. This raises questions about the level of error that species misidentifications could introduce to estimates of species’ life history parameters. This study addressed these questions using the Grey Reef Shark Carcharhinus amblyrhynchos as a case study. Observer misidentification rates were quantified by validating species identifications using diagnostic photographs taken on board supplemented with DNA barcoding. Length-at-age and maturity ogive analyses were then estimated and compared with and without the misidentified individuals. Vertebrae were retained from a total of 155 sharks identified by observers as C. amblyrhynchos. However, 22 (14%) of these were sharks were misidentified by the observers and were subsequently re-identified based on photographs and/or DNA barcoding. Of the 22 individuals misidentified as C. amblyrhynchos, 16 (73%) were detected using photographs and a further 6 via genetic validation. If misidentified individuals had been included, substantial error would have been introduced to both the length-at-age and the maturity estimates. Thus validating the species identification, increased the accuracy of estimated life history parameters for C. amblyrhynchos. From the corrected sample a multi-model inference approach was used to estimate growth for C. amblyrhynchos using three candidate models. The model averaged length-at-age parameters for C. amblyrhynchos with the sexes combined were L¯∞ = 159 cm TL and L¯0 = 72 cm TL. Females mature at a greater length (l50 = 136 cm TL) and older age (A50 = 9.1 years) than males (l50 = 123 cm TL; A50 = 5.9 years). The inclusion of techniques to reduce misidentification in observer programs will improve the results of life history studies and ultimately improve management through the use of more accurate data for assessments.
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Affiliation(s)
- Jonathan J. Smart
- Centre for Sustainable Tropical Fisheries and Aquaculture & College of Marine and Environmental Sciences, James Cook University, Townsville, Queensland, Australia
- * E-mail:
| | - Andrew Chin
- Centre for Sustainable Tropical Fisheries and Aquaculture & College of Marine and Environmental Sciences, James Cook University, Townsville, Queensland, Australia
| | - Leontine Baje
- Centre for Sustainable Tropical Fisheries and Aquaculture & College of Marine and Environmental Sciences, James Cook University, Townsville, Queensland, Australia
- National Fisheries Authority, National Capital District, Port Moresby, Papua New Guinea
| | - Madeline E. Green
- Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, Australia
- CSIRO Oceans & Atmosphere, Hobart, Australia
- Australian National Fish Collection, CSIRO National Research Collections Australia, Hobart, Australia
| | - Sharon A. Appleyard
- CSIRO Oceans & Atmosphere, Hobart, Australia
- Australian National Fish Collection, CSIRO National Research Collections Australia, Hobart, Australia
| | - Andrew J. Tobin
- Centre for Sustainable Tropical Fisheries and Aquaculture & College of Marine and Environmental Sciences, James Cook University, Townsville, Queensland, Australia
| | - Colin A. Simpfendorfer
- Centre for Sustainable Tropical Fisheries and Aquaculture & College of Marine and Environmental Sciences, James Cook University, Townsville, Queensland, Australia
| | - William T. White
- CSIRO Oceans & Atmosphere, Hobart, Australia
- Australian National Fish Collection, CSIRO National Research Collections Australia, Hobart, Australia
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17
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Henderson AC, Reeve AJ, Jabado RW, Naylor GJP. Taxonomic assessment of sharks, rays and guitarfishes (Chondrichthyes: Elasmobranchii) from south-eastern Arabia, using the NADH dehydrogenase subunit 2 (NADH2) gene. Zool J Linn Soc 2015. [DOI: 10.1111/zoj.12309] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Aaron C. Henderson
- Department of Marine Science & Fisheries; College of Agricultural & Marine Sciences; Sultan Qaboos University; PO Box 34 Al-Khod Oman
| | - Alan J. Reeve
- Department of Marine Science & Fisheries; College of Agricultural & Marine Sciences; Sultan Qaboos University; PO Box 34 Al-Khod Oman
| | - Rima W. Jabado
- Gulf Elasmo Project; PO Box 29588 Dubai United Arab Emirates
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18
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Bester-van der Merwe AE, Gledhill KS. Molecular species identification and population genetics of chondrichthyans in South Africa: current challenges, priorities and progress. AFRICAN ZOOLOGY 2015. [DOI: 10.1080/15627020.2015.1063408] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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19
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Marino IAM, Riginella E, Gristina M, Rasotto MB, Zane L, Mazzoldi C. Multiple paternity and hybridization in two smooth-hound sharks. Sci Rep 2015; 5:12919. [PMID: 26257113 PMCID: PMC4530440 DOI: 10.1038/srep12919] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2015] [Accepted: 07/02/2015] [Indexed: 11/09/2022] Open
Abstract
Multiple paternity appears to be a common trait of elasmobranch mating systems, with its occurrence likely driven by convenience, due to females seeking to minimize the stress of male harassment. Here we use molecular markers to analyse the frequency of multiple paternity in two related viviparous sharks, Mustelus mustelus and Mustelus punctulatus. We first applied molecular methods to assign pregnant females, embryos and additional reference adults (N = 792) to one of the two species. Paternity analysis was performed using a total of 9 polymorphic microsatellites on 19 females and 204 embryos of M. mustelus, and on 13 females and 303 embryos of M. punctulatus. Multiple paternity occurs in both species, with 47% of M. mustelus and 54% of M. punctulatus litters sired by at least two fathers. Female fecundity is not influenced by multiple mating and in 56% of polyandrous litters paternity is skewed, with one male siring most of the pups. Genetic analyses also revealed hybridization between the two species, with a M. punctulatus female bearing pups sired by a M. mustelus male. The frequency of polyandrous litters in these species is consistent with aspects of their reproductive biology, such as synchronous ovulation and possible occurrence of breeding aggregations.
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Affiliation(s)
- Ilaria A M Marino
- Department of Biology, University of Padova, Via U. Bassi 58/B, 35121 Padova, Italy
| | - Emilio Riginella
- Department of Biology, University of Padova, Via U. Bassi 58/B, 35121 Padova, Italy
| | - Michele Gristina
- IAMC-CNR, via Luigi Vaccara 61, 91026 Mazara del Vallo (TP), Italy
| | - Maria B Rasotto
- Department of Biology, University of Padova, Via U. Bassi 58/B, 35121 Padova, Italy
| | - Lorenzo Zane
- Department of Biology, University of Padova, Via U. Bassi 58/B, 35121 Padova, Italy
| | - Carlotta Mazzoldi
- Department of Biology, University of Padova, Via U. Bassi 58/B, 35121 Padova, Italy
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20
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Bernal MA, Sinai NL, Rocha C, Gaither MR, Dunker F, Rocha LA. Long-term sperm storage in the brownbanded bamboo shark Chiloscyllium punctatum. JOURNAL OF FISH BIOLOGY 2015; 86:1171-1176. [PMID: 25545440 DOI: 10.1111/jfb.12606] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2014] [Accepted: 11/13/2014] [Indexed: 06/04/2023]
Abstract
This study investigated the birth of a brownbanded bamboo shark Chiloscyllium punctatum at the Steinhart Aquarium. Genetic analyses suggest this is the longest documented case of sperm storage for any species of shark (45 months).
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Affiliation(s)
- M A Bernal
- University of Texas Marine Science Institute, 750 Channel View Dr, Port Aransas, TX 78373, U.S.A; California Academy of Sciences, 55 Music Concourse Dr, San Francisco, CA 94118, U.S.A
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21
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Espinoza M, Cappo M, Heupel MR, Tobin AJ, Simpfendorfer CA. Quantifying shark distribution patterns and species-habitat associations: implications of marine park zoning. PLoS One 2014; 9:e106885. [PMID: 25207545 PMCID: PMC4160204 DOI: 10.1371/journal.pone.0106885] [Citation(s) in RCA: 96] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2014] [Accepted: 08/10/2014] [Indexed: 11/18/2022] Open
Abstract
Quantifying shark distribution patterns and species-specific habitat associations in response to geographic and environmental drivers is critical to assessing risk of exposure to fishing, habitat degradation, and the effects of climate change. The present study examined shark distribution patterns, species-habitat associations, and marine reserve use with baited remote underwater video stations (BRUVS) along the entire Great Barrier Reef Marine Park (GBRMP) over a ten year period. Overall, 21 species of sharks from five families and two orders were recorded. Grey reef Carcharhinus amblyrhynchos, silvertip C. albimarginatus, tiger Galeocerdo cuvier, and sliteye Loxodon macrorhinus sharks were the most abundant species (>64% of shark abundances). Multivariate regression trees showed that hard coral cover produced the primary split separating shark assemblages. Four indicator species had consistently higher abundances and contributed to explaining most of the differences in shark assemblages: C. amblyrhynchos, C. albimarginatus, G. cuvier, and whitetip reef Triaenodon obesus sharks. Relative distance along the GBRMP had the greatest influence on shark occurrence and species richness, which increased at both ends of the sampling range (southern and northern sites) relative to intermediate latitudes. Hard coral cover and distance across the shelf were also important predictors of shark distribution. The relative abundance of sharks was significantly higher in non-fished sites, highlighting the conservation value and benefits of the GBRMP zoning. However, our results also showed that hard coral cover had a large effect on the abundance of reef-associated shark species, indicating that coral reef health may be important for the success of marine protected areas. Therefore, understanding shark distribution patterns, species-habitat associations, and the drivers responsible for those patterns is essential for developing sound management and conservation approaches.
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Affiliation(s)
- Mario Espinoza
- Centre for Sustainable Tropical Fisheries and Aquaculture and School of Earth and Environmental Sciences, James Cook University, Townsville, Queensland, Australia
- AIMS@JCU, Australian Institute of Marine Science, School of Earth and Environmental Sciences, James Cook University, Townsville, Queensland, Australia
| | - Mike Cappo
- Australian Institute of Marine Science, Townsville, Queensland, Australia
| | - Michelle R. Heupel
- Centre for Sustainable Tropical Fisheries and Aquaculture and School of Earth and Environmental Sciences, James Cook University, Townsville, Queensland, Australia
- Australian Institute of Marine Science, Townsville, Queensland, Australia
| | - Andrew J. Tobin
- Centre for Sustainable Tropical Fisheries and Aquaculture and School of Earth and Environmental Sciences, James Cook University, Townsville, Queensland, Australia
| | - Colin A. Simpfendorfer
- Centre for Sustainable Tropical Fisheries and Aquaculture and School of Earth and Environmental Sciences, James Cook University, Townsville, Queensland, Australia
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22
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Potts WM, Henriques R, Santos CV, Munnik K, Ansorge I, Dufois F, Booth AJ, Kirchner C, Sauer WHH, Shaw PW. Ocean warming, a rapid distributional shift, and the hybridization of a coastal fish species. GLOBAL CHANGE BIOLOGY 2014; 20:2765-2777. [PMID: 24753154 DOI: 10.1111/gcb.12612] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2013] [Revised: 04/04/2014] [Accepted: 04/08/2014] [Indexed: 06/03/2023]
Abstract
Despite increasing awareness of large-scale climate-driven distribution shifts in the marine environment, no study has linked rapid ocean warming to a shift in distribution and consequent hybridization of a marine fish species. This study describes rapid warming (0.8 °C per decade) in the coastal waters of the Angola-Benguela Frontal Zone over the last three decades and a concomitant shift by a temperature sensitive coastal fish species (Argyrosomus coronus) southward from Angola into Namibia. In this context, rapid shifts in distribution across Economic Exclusive Zones will complicate the management of fishes, particularly when there is a lack of congruence in the fisheries policy between nations. Evidence for recent hybridization between A. coronus and a congener, A. inodorus, indicate that the rapid shift in distribution of A. coronus has placed adults of the two species in contact during their spawning events. Ocean warming may therefore revert established species isolation mechanisms and alter the evolutionary history of fishes. While the consequences of the hybridization on the production of the resource remain unclear, this will most likely introduce additional layers of complexity to their management.
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Affiliation(s)
- Warren M Potts
- Department of Ichthyology and Fisheries Science, Rhodes University, Grahamstown, South Africa
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23
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First identification of interspecies hybridization in the freshwater stingrays Potamotrygon motoro and P. falkneri (Myliobatiformes, Potamotrygonidae). CONSERV GENET 2014. [DOI: 10.1007/s10592-014-0642-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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24
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Taylor SM, Bennett MB. Size, sex and seasonal patterns in the assemblage of Carcharhiniformes in a sub-tropical bay. JOURNAL OF FISH BIOLOGY 2013; 82:228-241. [PMID: 23331147 DOI: 10.1111/jfb.12003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Size, sex and seasonal patterns among Carcharhiniformes were examined in shallow regions of Moreton Bay, Queensland, Australia. A total of 1259 sharks were caught, comprising 13 species. The Australian sharpnose shark Rhizoprionodon taylori and the blacktip complex Carcharhinus limbatus-Carcharhinus tilstoni comprised 55% of all shark individuals. Neonates were observed for five species including the dusky shark Carcharhinus obscurus, which contrary to previous reports was relatively abundant in shallow, predominantly estuarine waters. Three contrasting patterns of occurrence were observed: smaller species were abundant and present throughout much of their ontogeny, larger species were mainly caught as neonates or juveniles and vagrant species were only caught during the warmer months. The shark assemblage differed significantly among seasons. While many species were observed during the warmer months, species diversity was lower in winter when C. obscurus comprised 43% of the catch. Overall, the results indicated that spatial and temporal distribution patterns were not synchronous for all species. The capture of small numbers of neonate C. obscurus in late autumn and winter demonstrates that parturition among Carcharhiniformes is not confined to spring and summer in sub-tropical waters.
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Affiliation(s)
- S M Taylor
- School of Biomedical Sciences, University of Queensland, Brisbane, Qld 4072, Australia
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25
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Species boundaries in the Himantura uarnak species complex (Myliobatiformes: Dasyatidae). Mol Phylogenet Evol 2013; 66:429-35. [DOI: 10.1016/j.ympev.2012.09.023] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2012] [Revised: 09/18/2012] [Accepted: 09/19/2012] [Indexed: 11/23/2022]
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Harry AV, Morgan JAT, Ovenden JR, Tobin AJ, Welch DJ, Simpfendorfer CA. Comparison of the reproductive ecology of two sympatric blacktip sharks (Carcharhinus limbatus and Carcharhinus tilstoni) off north-eastern Australia with species identification inferred from vertebral counts. JOURNAL OF FISH BIOLOGY 2012; 81:1225-1233. [PMID: 22957866 DOI: 10.1111/j.1095-8649.2012.03400.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Precaudal vertebral counts were used to distinguish between 237 morphologically similar Carcharhinus limbatus and Carcharhinus tilstoni and were congruent with differences in reproductive ecology between the species. In addition to differing lengths at maturity and adult body size, the two species had asynchronous parturition, were born at different sizes and the relative frequencies of neonates differed in two coastal nursery areas. Despite evidence that hybridization can occur, these differences suggest the species are largely reproductively isolated.
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Affiliation(s)
- A V Harry
- Centre for Sustainable Tropical Fisheries and Aquaculture & School of Earth and Environmental Sciences, James Cook University, Townsville, Qld 4811, Australia.
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27
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Dudgeon CL, Blower DC, Broderick D, Giles JL, Holmes BJ, Kashiwagi T, Krück NC, Morgan JAT, Tillett BJ, Ovenden JR. A review of the application of molecular genetics for fisheries management and conservation of sharks and rays. JOURNAL OF FISH BIOLOGY 2012; 80:1789-1843. [PMID: 22497408 DOI: 10.1111/j.1095-8649.2012.03265.x] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Since the first investigation 25 years ago, the application of genetic tools to address ecological and evolutionary questions in elasmobranch studies has greatly expanded. Major developments in genetic theory as well as in the availability, cost effectiveness and resolution of genetic markers were instrumental for particularly rapid progress over the last 10 years. Genetic studies of elasmobranchs are of direct importance and have application to fisheries management and conservation issues such as the definition of management units and identification of species from fins. In the future, increased application of the most recent and emerging technologies will enable accelerated genetic data production and the development of new markers at reduced costs, paving the way for a paradigm shift from gene to genome-scale research, and more focus on adaptive rather than just neutral variation. Current literature is reviewed in six fields of elasmobranch molecular genetics relevant to fisheries and conservation management (species identification, phylogeography, philopatry, genetic effective population size, molecular evolutionary rate and emerging methods). Where possible, examples from the Indo-Pacific region, which has been underrepresented in previous reviews, are emphasized within a global perspective.
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Affiliation(s)
- C L Dudgeon
- The University of Queensland, St Lucia, Brisbane, Queensland 4072, Australia.
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