Pattern of oocyte development and batch fecundity in the Mediterranean sardine

Ganias, Konstantinos; Somarakis, Stylianos; Machias, Athanassios; Θεοδώρου, Α.

doi:10.1016/j.fishres.2003.08.008

Cited by 72 publications

(80 citation statements)

References 27 publications

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“…The genetic boundary between the Atlantic and the Mediterranean separates sardines with shallow but significant morphometric differences and substantial differences in growth performance, with individuals from Mediterranean showing a lower head-to-body ratio (Silva 2003, Silva et al 2008, lower length-at-age and lower maximum length (Silva et al 2008). Other morphological and life-history traits were reported to vary between the 2 regions, such as the number of gill rakers (Andreu 1969), relative fecundity and spawning frequency (Ganias et al 2003;Ganias et al 2004) and length at first maturity (Silva et al 2006): all of these showed lower values in the Mediterranean Sea, possibly reflecting a combination of poorer growth and lower global productivity in the area.…”

Section: Genetic Structure Based On Non-neutral Variation and Correlamentioning

confidence: 99%

Evidence for microsatellite hitchhiking selection in European sardine (<i>Sardina pilchardus</i>) and implications in inferring stock structure

Kasapidis¹,

Silva²,

Zampicinini³

et al. 2011

Sci. Mar.

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SUMMARY:The genetic structure of the European sardine (Sardina pilchardus) was assessed throughout its geographic range using five microsatellite loci. One of the loci seemed to be under hitchhiking selection and exhibited a latitudinal cline along the eastern Atlantic, with abrupt change in allele frequencies from the Alboran Sea to the western Mediterranean and from the east Atlantic coast to the Azores and Madeira. This pattern was very similar to that previously described for the allozymic locus SOD* and these 2 loci could be linked. A Bayesian analysis of environmental factors with the genetic data indicated temperature as a potential selection factor. Selection pressure may be stronger at the southern limit of sardine distribution, because heterozygosity of the non-neutral locus was much lower there. The abrupt change in allele frequencies of the non-neutral locus in certain regions seem to be related more to strong barriers to gene flow, which were not evident for neutral loci, than to abrupt changes in selection pressure. These areas of discontinuity provide a guideline to define and delineate genetic stocks and are generally consistent with areas of phenotypic change in sardine, but they are not in concordance with the currently recognized morphological subspecies.Keywords: sardine, genetic structure, microsatellite DNA, selection, Atlantic, Mediterranean. RESUMEN: Evidencia para selección hitchhiking de microsatélite en sardina europea (Sardina pilcharduS) y las implicaciones para inferir la estructura del stock. -La estructura genética de la sardina europea se evaluó a lo largo de su área de distribución geográfica, con cinco loci de microsatélites. Uno de los loci parecía estar bajo selección por hitchhiking y exhibió una clina latitudinal a lo largo del Atlántico oriental, con el cambio abrupto en las frecuencias alélicas del Mar de Alborán al Mediterráneo Occidental y de la costa Oriental del Atlántico hacia las Azores y Madeira. Este patrón es muy similar al descrito previamente para el locus alozímico SOD*, por lo que estos dos loci podrían estar ligados. Un análisis bayesiano de factores ambientales con los datos genéticos indicó que la temperatura puede ser el factor de selección. La presión de selección puede ser más fuerte en el límite sur de distribución de la sardina, dado que la heterozigosis del locus no neutro fue allí mucho más baja. El abrupto cambio en las frecuencias alélicas de locus no neutro parece estar relacionado más con barreras fuertes al flujo de genes, que no se evidenciaron en el caso de los loci neutrales, que a cambios en la presión de selección. Estas áreas de discontinuidad proporcionan una guía para definir y delinear stocks genéticos y son generalmente consistentes con las áreas de cambio fenotípico de la sardina, pero no están conformes con las subespecies morfológicas actualmente reconocidas.

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Section: Genetic Structure Based On Non-neutral Variation and Correlamentioning

confidence: 99%

Evidence for microsatellite hitchhiking selection in European sardine (<i>Sardina pilchardus</i>) and implications in inferring stock structure

Kasapidis¹,

Silva²,

Zampicinini³

et al. 2011

Sci. Mar.

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show abstract

“…Although the duration of the hydrated ovary stage is restricted to a few hours within a day, and difficult to sample, this particular stage has been the most used and reliable method to estimate batch fecundity for indeterminate annual fecundity, rather than other stages of oocyte development that can be equally accurate (Ganias et al 2004).…”

Section: Discussionmentioning

confidence: 99%

“…Llanos-Rivera and Castro (2004) reported a latitudinal gradient in egg size of anchovy along the Chilean coast, with larger planktonic eggs found in the area off southern Chile (37º S) and smaller ones in the northern part (21º S). Leal et al (2009) compared oocyte size and batch fecundity in the two contrasting anchovy spawning areas off Chile, and suggested that the cost of producing larger oocytes in the southern subpopulation seems to be horas de un día, y por tanto es difícil de ser muestreado, este particular estadio ha sido el más utilizado y confiable método para estimar la fecundidad parcial en casos de fecundidad anual indeterminada, aunque otros estadios de desarrollo ovocíticos pueden ser igualmente precisos (Ganias et al 2004).…”

Section: Discussionunclassified

Spatial and temporal changes in batch fecundity of common sardine and anchovy off central and southern Chile (2002–2007)

et al. 2011

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Anchovy Engraulis ringens and common sardine Strangomera bentincki are two small pelagic fish that co-occur in the same reproductive habitat off central and southern Chile and have a similar reproductive strategy. Interannual and spatial changes in the batch fecundity of both fish were analyzed with the purpose of detecting variability in the parameters and inferring different reproductive tactics that could affect the reproductive potential. Samples were obtained from adult surveys carried out to estimate spawning biomass by the Daily Egg Production Method, from 2002 to 2007, off Chile. The study area was divided into two zones: central and south. The batch fecundity was linearly related to ovary-free female body weight for each year. For anchovy, the slope was not different across years and zones, while for sardine, changes in intercept and slopes varied significantly among years, but not between zones. The average weight of mature females tended to be higher in the south zone for both species, and average batch fecundity ranged from 4,283 to 8,903 eggs per mature female anchovy, and from 5,901 to 10,414 eggs per mature female sardine. Although the anchovy and sardine reproductive strategy is similar, differences in batch fecundity seemed to be the main distinction between the species in the central and southern spawning sites off Chile, with implications for the reproductive potential.

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“…Thus, batch-spawning species with asynchronous oocyte development, such as the Atlantic sardine Sardina pilchardus (also known as European pilchard), may have only Vtg1 or Vtg2 oocytes present immediately after spawning (Ganias et al 2004), but the presence of POFs indicates that the fish have previously spawned during the current reproductive cycle and should thus be considered spawning capable. Fish with POFs could be placed into a past-spawner subphase, which is equivalent to the "partially spent" (Macer 1974;Murphy and Taylor 1990;Lowerre-Barbieri et al 1996;Acuña et al 2000) and "spawned and recovering" (Núñez and Duponchelle 2009) terminology previously used for batch-spawning species.…”

Section: Female Reproductive Cyclementioning

confidence: 99%

Spawning Aggregation of Beardfish, Polymixia lowei, in a Deep-water Sinkhole off the Florida Keys

Baumberger¹,

Brown‐Peterson²,

Reed³

et al. 2010

Copeia

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Pattern of oocyte development and batch fecundity in the Mediterranean sardine

Cited by 72 publications

References 27 publications

Evidence for microsatellite hitchhiking selection in European sardine (<i>Sardina pilchardus</i>) and implications in inferring stock structure

Evidence for microsatellite hitchhiking selection in European sardine (<i>Sardina pilchardus</i>) and implications in inferring stock structure

Spatial and temporal changes in batch fecundity of common sardine and anchovy off central and southern Chile (2002–2007)

Spawning Aggregation of Beardfish, Polymixia lowei, in a Deep-water Sinkhole off the Florida Keys

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