Settlement of the muricid Concholepas concholepas and its relationship with El Niño and coastal upwellings in southern Chile

Moreno, Carlos; Asencio, Gladys; Duarte, William E.; Marín, Valentina

doi:10.3354/meps167171

Cited by 29 publications

(24 citation statements)

References 4 publications

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“…Thus, individuals that lie at the extremes of the niche would be favored in the long run. In macroecological systems, this has been demonstrated to occur in rocky intertidal regions on the coast of Chile (35,36), where the survivability of young herbivore recruits is clearly favored when they metamorphose into sessile phases in less-crowded refuges and ponds. The relative importance of these possible mechanisms might be resolved only by experimentally exploring the interplay between ecological and evolutionary processes under conditions where environmental variability may allow for the fluctuation in selection coefficients and thereby promote coexistence of genetic variants (12).…”

Section: Discussionmentioning

confidence: 99%

Evolution of Diversity in Spatially Structured Escherichia coli Populations

Ponciano

La²,

Joyce

et al. 2009

Appl Environ Microbiol

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The stochastic Ricker population model was used to investigate the generation and maintenance of genetic diversity in a bacterial population grown in a spatially structured environment. In particular, we showed that Escherichia coli undergoes dramatic genetic diversification when grown as a biofilm. Using a novel biofilm entrapment method, we retrieved 64 clones from each of six different depths of a mature biofilm, and after subculturing for ϳ30 generations, we measured their growth kinetics in three different media. We fit a stochastic Ricker population growth model to the recorded growth curves. The growth kinetics of clonal lineages descendant from cells sampled at different biofilm depths varied as a function of both the depth in the biofilm and the growth medium used. We concluded that differences in the growth dynamics of clones were heritable and arose during adaptive evolution under local conditions in a spatially heterogeneous environment. We postulate that under nutrient-limited conditions, selective sweeps would be protracted and would be insufficient to purge less-fit variants, a phenomenon that would allow the coexistence of genetically distinct clones. These findings contribute to the current understanding of biofilm ecology and complement current hypotheses for the maintenance and generation of microbial diversity in spatially structured environments.

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Section: Discussionmentioning

confidence: 99%

Evolution of Diversity in Spatially Structured Escherichia coli Populations

Ponciano

La²,

Joyce

et al. 2009

Appl Environ Microbiol

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“…Recent studies have documented the existence of a positive relationship between C. concholepas settlement and upwelling intensity index in southern Chile (Moreno et al 1998) and the possible influence of upwelling events on the distribution of competent larvae in nearshore waters (Poulin et al 2002). Moreover, a recent study showed the absence of competent larvae in coastal surface waters during night tows, which contrasted with their abundance during daylight hours and suggested that this larval stage could undergo vertical migration (Poulin et al 2002).…”

mentioning

confidence: 85%

Avoiding offshore transport of competent larvae during upwelling events: The case of the gastropod Concholepas concholepas in Central Chile

Poulin

Palma

Leiva

et al. 2002

Limnology & Oceanography

123

113

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The coast of central Chile is characterized by the occurrence of coastal upwelling during the austral spring and summer seasons, which probably has important consequences for the cross‐shelf transport of larval stages of many species. Three cruises were conducted off the locality of El Quisco during upwelling‐favorable wind periods to determine the surface distribution of epineustonic competent larvae of the gastropod Concholepas concholepas during such events. Contrary to the predictions of a traditional model, where neustonic‐type larvae are transported offshore under such conditions, competent larvae of this species were exclusively found in the area between the shore and the upwelling front. Two additional cruises were conducted during calm periods to determine diel variation in the vertical distribution of C. concholepas competent larvae. The absence of competent larvae at the surface during early night hours suggests a reverse vertical migration. Thus, the retention of C. concholepas competent larvae in the upwelled waters could be the result of the interaction between their reverse diel vertical migration and the typical two‐layer upwelling dynamics.

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“…El loco (Concholepas concholepas) se distribuye desde la costa central de Perú a Magallanes (Moreno et al, 1998) siendo extraído por las comunidades litorales desde el Holoceno temprano (Báez et al, 2004;Rivadeneira et al, 2010). A fines de la década del 70's y comienzos de los 80's, los desembarques aumentaron (incentivos por demanda y precio) disminuyendo drásticamente poco después de El Niño 82-83 en la zona norte (Regiones I-III), segunda mitad de la década (Regiones la IV y X), y a mediados de los 90's al sur (B. Yannicelli, com.…”

Section: Concholepas Concholepas Y Variabilidad Ambientalunclassified

“…Estos, entre otros motivos (escalas metapoblacionales, captura ilegal), dificultan la utilización de series históricas de desembarque en el análisis recurso-ambiente, requiriéndose estudios con mayor detalle espacial e indicadores adicionales (esfuerzo, estructura de talla). Moreno et al (1998) y Moreno (2004 a través del seguimiento interanual de reclutamiento, han correlacionado fallas del reclutamiento en la zona de Valdivia durante períodos El Niño-La Niña que podrían obedecer a cambios en los patrones de vientos. Sin embargo, las consecuencias poblacionales no han sido evaluadas.…”

Section: Concholepas Concholepas Y Variabilidad Ambientalunclassified