Genetically different Atlantic herring Clupea harengus spawning waves

McPherson, Arran A.; Stephenson, Robert L.; Taggart, Christopher T.

doi:10.3354/meps247303

Cited by 44 publications

(39 citation statements)

References 19 publications

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“…Differences in spawning time and place have also been implicated in temporal genetic differentiation (McPherson et al 2003). Similarly to other notothenioids for which the onset of spawning exhibits latitudinal variation, such as Dissostichus eleginoides (Laptikhovsky et al 2006) and the channichthyid Champsocephalus gunnari (Everson et al 2001), C. aceratus populations inhabiting the southerly distribution range (South Shetlands) spawn from February to May, whereas northerly (South Georgia) spawning starts 1 or 2 mo earlier (Kock & Kellermann 1991).…”

Section: Recruitment and Reproductive Success Variabilitymentioning

confidence: 99%

Spatial and temporal boundaries to gene flow between Chaenocephalus aceratus populations at South Orkney and South Shetlands

Papetti¹,

Susana²,

Patarnello³

et al. 2009

Mar. Ecol. Prog. Ser.

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The black-fin icefish Chaenocephalus aceratus is among the most abundant fish species on the Antarctic continental shelves of the Scotia Arc, and Bouvet Island. We genotyped 11 microsatellite loci in C. aceratus population samples from South Orkney, southern South Shetlands, and Elephant Island (northern South Shetlands) collected in 2002 and 2006. This investigation further develops a previous study on the species reporting the presence of one panmittic population in southern South Shetlands and Elephant Island, with genetic differentiation between year classes. Our results reveal a more complex pattern of differentiation than shown previously, as genetic differences occur both at the temporal level at Elephant Island and at the geographic scale between southern South Shetland -Elephant Islands and South Orkney population samples. In particular, the magnitude of genetic differentiation at the temporal scale, the relatively high effective population size (N e ) and high gene flow indicate that genetic differentiation is not only driven by geographic distance. At present, our results should be taken into account when defining conservation measures and management boundaries in regions where fishery is still open or where other Antarctic fish species are still exploited.

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Section: Recruitment and Reproductive Success Variabilitymentioning

confidence: 99%

Spatial and temporal boundaries to gene flow between Chaenocephalus aceratus populations at South Orkney and South Shetlands

Papetti¹,

Susana²,

Patarnello³

et al. 2009

Mar. Ecol. Prog. Ser.

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“…According to the authors, a spawning school could represent an interbreeding unit. The genetic homogeneity and differentiation of the spawning school could be supported by mechanisms such as spawning waves (McPherson et al, 2003;Jorgensen et al, 2005) or homing (Ryman and Utter, 1987), which would promote the segregation of different genetic populations during the reproductive season.…”

Section: Genetic Variation and Population Structuring On Migratory Frmentioning

confidence: 99%

“…Different groups that spawn at a same location but at different times are known as spawning waves (McPherson et al, 2003;Jorgensen et al 2005).…”

Section: Genetic Variation and Population Structuring On Migratory Frmentioning

confidence: 99%

Contribution of conservation genetics in assessing neotropical freshwater fish biodiversity

Piorski¹,

Sanches

Costa

et al. 2008

Braz. J. Biol.

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Human activities have a considerable impact on hydrographic systems and fish fauna. The present review on conservation genetics of neotropical freshwater fish reveals that DNA analyses have been promoting increased knowledge on the genetic structure of fish species and their response to environmental changes. This knowledge is fundamental to the management of wild fish populations and the establishment of Evolutionary Significant Units capable of conserving genetic integrity. While population structuring can occur even in long-distance migratory fish, isolated populations can show reduced genetic variation and be at greater risk of extinction. Phylogeography and phylogeny have been powerful tools in understanding the evolution of fish populations, species and communities in distinct neotropic environments. Captive fish can be used to introduce new individuals and genes into the wild and their benefits and disadvantages can be monitored through genetic analysis. Understanding how fish biodiversity in neotropical freshwaters is generated and maintained is highly important, as these habitats are transformed by human development and fish communities are increasingly exploited as food sources to sustain a growing human population.Keywords: molecular genetics, fish population, biology conservation. Contribuição da Genética da Conservação para o conhecimento da biodiversidade dos peixes de água doce neotropicais ResumoAtividades humanas têm um grande impacto sobre os sistemas hidrográficos e a fauna de peixes. A presente revisão em genética da conservação dos peixes de água doce neotropicais revela que as análises de DNA têm promovido um crescimento no conhecimento da estrutura genética das espécies e suas respostas às alterações ambientais. Este conhecimento é fundamental para o manejo das populações de peixes nativos e para o estabelecimento de Unidades Evolutivas Significantes capazes de conservar a integridade genética dessas populações. Enquanto o fenômeno de estruturação de populações pode ocorrer mesmo em peixes migradores de longas distâncias, populações isoladas podem mostrar reduzida variação genética e apresentar grande risco de extinção. Em adição, a filogeografia e a filogenia têm dado importantes contribuições para o entendimento da evolução das populações, espécies e comunidades de peixes em distintos ambientes neotropicais. Populações de cativeiro podem ser utilizadas como fonte de introdução de novos indivíduos e genes no ambiente natural e seus benefícios e desvantagens podem ser monitorados por meio de análises genéticas. É altamente importante, portanto, entender como é gerada e mantida a biodiversidade de peixes de água doce neotropicais, uma vez que os habitats são transformados pelo desenvolvimento humano e as comunidades de peixes têm sido intensamente exploradas como alimento de sustentação desse crescimento das populações humanas.Palavras-chave: genética molecular, populações de peixes, conservação biológica.

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“…temporal or spatial Whalund effect), as well as possible local inbreeding. The occurrence of a spatial and temporal Whalund effect is one of the classical hypotheses put forward to explain the genetic patchiness (Johnson & Black 1982 in the marine environment, a phenomenon increasingly reported both for invertebrates (Jolly et al 2003, Juinio-Menez et al 2003, Casu et al 2005, Andrade & Solferini 2007, Arnaud-Haond et al 2008) and fish (Doherty et al 1995, Exadactylos et al 1998, Planes et al 2002, McPherson et al 2003, Selkoe et al 2006, Burford & Larson 2007, GonzalezWanguemert et al 2007, and which is likely to generate significant and large F IS values. In the present study, a possible origin of genetic patchiness, involving admixture of seeds from different origins, and a possible low number of trees at the origin of those events of recruitment (bottleneck effect), are also supported by the lack of trends in the evolution of allelic richness when analyzed in each 5 yr cohort rather than in cumulative age classes (Fig.…”

Section: Discussionmentioning

confidence: 99%

Genetic recolonization of mangrove: genetic diversity still increasing in the Mekong Delta 30 years after Agent Orange

Arnaud‐Haond¹,

Duarte

Teixeira³

et al. 2009

Mar. Ecol. Prog. Ser.

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The widespread use of Agent Orange (a mixture of phenoxyl herbicides) over Southern Vietnam by US Forces led to the decimation of mangrove forests in the Mekong Delta. Mangrove trees Avicennia alba were sampled across the Mekong Delta; their age was assessed using models based on internode growth and samples were genotyped for 6 microsatellite loci. The evolution of genetic diversity over time elapsed since local extinction was reconstructed and compared with the genetic diversity of an unaffected population from Thailand. The results show that genetic diversity of the A. alba population is still increasing in the Mekong Delta 3 decades after the end of the Vietnam War, but is reaching an asymptotic level that is comparable to the adjacent non-affected population of Thailand. This might be a sign of genetic recovery, but may also reveal a limitation, either of genetic enrichment due to current predominance of auto-recruitment or of demographic increase due to intraspecific competition in this pioneer species. In any case, these results, although encouraging, demonstrate that genetic recovery after complete or almost complete population depletion continues over a longer time-scale than apparent demographic recovery. KEY WORDS: Recolonization genetics · Genetic recovery · Demographic recovery · Local extinction · Mangrove · Deforestation · Agent OrangeResale or republication not permitted without written consent of the publisher Mar Ecol Prog Ser 390: 129-135, 2009 by US Forces of a highly toxic defoliant named Agent Orange (Stellman et al. 2003) over Southern Vietnam, which led to the decimation of mangrove forests in the Mekong Delta. A major unprecedented reforestation program was led, following the end of the US-Vietnam war (1974), by the Vietnamese government to recover the lost mangrove area (Hong & San 1993, Hong 1996. This effort, however, was based on the use of a single genus, Rhizophora, for which nurseries were available and which local communities (including scientists and local farmers) believed to be the most valuable component of mangrove forests. As a result of these efforts, Rhizophora stands have partially recovered (Hong 1996). In contrast, the recovery of other mangrove species in the community, such as the hermaphroditic Avicennia alba, was dependent on propagule dispersal from external sources, but tree cover and density were recovered about 2 decades later (Hong 1996). However, because potential sources of propagules in the Mekong Delta were few and distant, due to the thorough herbicide devastation of the vast mangrove forest area, it is likely that most colonizing propagules were delivered from a few sources. As a consequence of this extinction-recolonization process, the recovery of the plant population may have involved initial decimation of genetic diversity relative to the original stands, a genetic bottleneck effect, eventually followed by recovery at an unknown rate. Whereas the rates and patterns of recovery of plant communities have been extensively studied, including...

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Genetically different Atlantic herring Clupea harengus spawning waves

Cited by 44 publications

References 19 publications

Spatial and temporal boundaries to gene flow between Chaenocephalus aceratus populations at South Orkney and South Shetlands

Spatial and temporal boundaries to gene flow between Chaenocephalus aceratus populations at South Orkney and South Shetlands

Contribution of conservation genetics in assessing neotropical freshwater fish biodiversity

Genetic recolonization of mangrove: genetic diversity still increasing in the Mekong Delta 30 years after Agent Orange

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