Feeding and distribution of the bigeye flounder Hippoglossina macrops off Northern Chile

Acuña, Enzo; Andrade, Maria Jaqueline Monte de

doi:10.1071/mf00047

Cited by 7 publications

(3 citation statements)

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“…This link seems to be the ability of P. monodon to tolerate severely hypoxic to anoxic conditions for several days and to migrate between the two habitats, possibly on a daily basis. Anoxic or severely hypoxic conditions at the seafloor may actually benefit P. monodon, as they provide shelter from predatory demersal fish such as the bigeye flounder (Hippoglossa macrops), which is an important predator of P. monodon on the better-oxygenated shelf off Chile (Villarroel et al 2001). The observed p crit of 0.5 kPa is one of the lowest recorded for metazoans that migrate into or are endemic within OMZs, most of which have a p crit > 1.0 kPa (Seibel 2011).…”

Section: Resultsmentioning

confidence: 99%

The squat lobster Pleuroncodes monodon tolerates anoxic “dead zone” conditions off Peru

et al. 2015

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Section: Resultsmentioning

confidence: 99%

The squat lobster Pleuroncodes monodon tolerates anoxic “dead zone” conditions off Peru

et al. 2015

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“…Even though oxygen concentration may have phenotypic and/or deleterious effects on organisms in general (Crispo and Chapman 2008; Ulloa and Pantoja 2009), it has been shown that P. monodon has physiological adaptations to live in low oxygen zones. The shallow OMZ may even represent a predation refuge for the species (Villarroel et al 2001). It is unknown the extent of the OMZ and its effect on benthic communities (Thiel et al 2007) so maybe, indirectly, it is still affecting P. monodon in spite of its own adaptability to low oxygen regimes.…”

Section: Discussionmentioning

confidence: 99%

Heterochronic phenotypic plasticity with lack of genetic differentiation in the southeastern Pacific squat lobster Pleuroncodes monodon

Haye

Salinas

Acuña

et al. 2010

Evolution and Development

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Two forms of the squat lobster Pleuroncodes monodon can be found along the Pacific coast of South America: a smaller pelagic and a larger benthic form that live respectively in the northern and southern areas of the geographic distribution of the species. The morphological and life history differences between the pelagic and benthic forms could be explained either by genetic differentiation or phenotypic plasticity. In the latter case it would correspond to a heterochronic phenotypic plasticity that is fixed in different environments (phenotype fixation). The aim of this study was to evaluate whether the two forms are genetically differentiated or not; and thus to infer the underlying basis-heritable or plastic-of the existence of the two forms. Based on barcoding data of mitochondrial DNA (the COI gene), we show that haplotypes from individuals of the pelagic and benthic forms comprise a single genetic unit without genetic differentiation. Moreover, the data suggest that all studied individuals share a common demographic history of recent and sudden population expansion. These results strongly suggest that the differences between the two forms are due to phenotypic plasticity.

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“…We considered S. capensis to be a fish with low vagility. Finally, H. macrops , like other flatfishes, performs only small migratory movements from shallow to deep waters, associated with ontogenetic changes in diet (Villarroel et al. , 2000).…”

Section: Methodsmentioning

confidence: 99%

The decay of similarity over geographical distance in parasite communities of marine fishes

Oliva

González

2005

Journal of Biogeography

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Aim We evaluate, for the first time, the decay of similarity over distance in four species of marine fishes with different vagility: Trachurus murphyi (pelagic, highly vagile), Merluccius gayi (demersal, highly vagile), Sebastes capensis (demersal, low vagility) and Hippoglossina macrops (benthic, non-vagile).Location We use our own data of the species composition of parasite communities in four host species: T. murphyi (Perciformes), M. gayi (Gadiformes), H. macrops (Pleuronectiformes) and S. capensis (Scorpaeniformes), from the coast of Chile and southern Argentina. Trachurus murphyi, M. gayi and H. macrops in the area studied live closely associated with the cold waters of the Humboldt Current System, while S. capensis in southern Chile is associated with the fjord areas south of c. 43°S, and in Argentina this species lives in close association with the cold water of the Malvinas Current, which mixes with the warm water of the Brazilian Current in the sampled area. Thus, for all four host species there are no known geographical (oceanographic) barriers that interrupt their continuous distributions.Methods Fish were collected and frozen ()18°C) until examination in the laboratory. After thawing, each visceral organ was dissected separately, washed in running water, filtered using a mesh of 0.25 mm, and examined under a stereomicroscope (20·). For S. capensis, only ectoparasites were included in this study because data on endoparasites for some locations are not available. The approach of Poulin [Journal of Biogeography 30 (2003) 1609] was used. For each host species, we computed similarity in parasite composition using the BrayCurtis distance on a presence/absence matrix. Similarity between each pair of localities was correlated (linear regression on raw and transformed data) with the distance (in nautical miles) among those sites.Results Among conspecific populations of host fish, there was no correlation between sample size and parasite species richness. The same pattern was evident when all host populations were pooled and treated as a single sample. Except for H. macrops, an important proportion of the geographical ranges of the host species was covered. The decay in similarity of parasite communities over distance was recorded in three of the four hosts analysed. For H. macrops, no relationship between distances and decay of similarity was evident. A linear regression on nontransformed data provided a good fit, and the regression on log(n + 1) does not change significantly for both r 2 and probability, but slopes are smaller for logtransformed than for non-transformed data.Main conclusions Three of the four fish parasite systems studied fit well with the expected decay of similarity over distance. The slopes of the relationship between distance and similarity in the marine fishes studied are lower, but significant (three orders of magnitude) than those recorded in freshwater fishes by Poulin (2003). In our case, Hippoglossina macrops (benthic, non-vagile host)

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Feeding and distribution of the bigeye flounder Hippoglossina macrops off Northern Chile

Cited by 7 publications

References 0 publications

The squat lobster Pleuroncodes monodon tolerates anoxic “dead zone” conditions off Peru

The squat lobster Pleuroncodes monodon tolerates anoxic “dead zone” conditions off Peru

Heterochronic phenotypic plasticity with lack of genetic differentiation in the southeastern Pacific squat lobster Pleuroncodes monodon

The decay of similarity over geographical distance in parasite communities of marine fishes

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