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Claudio Quezada-Romegialli Mabel Fuentes David Véliz 《Environmental Biology of Fishes》2010,89(2):173-186
To describe comparative population genetic structure of the Chilean silverside Basilichthys microlepidotus and the catfish Trichomycterus areolatus, four rivers and three sites within each river were investigated by the analysis of haplotype polymorphisms of the mitochondrial
Control Region. For both species, analyses revealed significant differentiation among rivers and low differences within rivers.
However, the species differ in haplotype composition; individuals of B. microlepidotus shared some haplotypes in all four rivers, while individuals of T. areolatus showed a different haplotype composition in most rivers. This difference may be explained by the different ecological features
of the species. Assuming that both silversides and catfish were present before the separation of the rivers, B. microlepidotus migrated after river isolation, probably using coastal water, while T. areolatus has probably never migrated between these rivers. The long times that the studied rivers have been separated should be taken
into account in future conservation plans for the freshwater fish of Chile. 相似文献
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Amos Casti Arnaldo Corti Giancarla Orlandini Franco Drusiani Caudio M. Calderera 《Life sciences》1978,23(13):1337-1342
Ornithine decarboxylase and S-adenosylmethionine decarboxylase activities increase in hypoxic perfused rabbit heart (more with less severe hypoxia). Anoxic perfusion causes a decrease in the former activity and no effect in the latter. Changes in polyamine specific radioactivity are consistent with those of the the two enzymes, except for the enhancement at 60 minutes of anoxia. 相似文献
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Paulina Andrea Bahamonde Gustavo Chiang Gabriela Mancilla Tamara Contador Caudio Quezada-Romegialli Kelly Roland Munkittrick Chris Harrod 《Journal of fish biology》2024,104(1):139-154
Salmonids were first introduced into the Chilean fresh waters in the 1880s, and c. 140 years later, they are ubiquitous across Chilean rivers, especially in the southern pristine fresh waters. This study examined the brown trout (Salmo trutta) and native taxa ecology in two adjacent but contrasting rivers of Chilean Patagonia. During spring 2016 and spring–fall 2017 we examined the variation in benthic macroinvertebrate and fish community composition and characterized fish size structure, stomach contents, and stable isotopes (δ13C and δ15N) to understand population structure, fish diet, and trophic interactions between S. trutta and native taxa. The native Galaxias maculatus (puye) dominated the fish community (74% of abundance). S. trutta was less abundant (16% of survey catch) but dominated the fish community (over 53%) in terms of biomass. S. trutta showed distinct diets (stomach content analysis) in the two rivers, and individuals from the larger river were notably more piscivorous, consuming native fish with a relatively small body size (<100-mm total length). Native fishes were isotopically distinct from S. trutta, which showed a wider isotopic niche in the smaller river, indicating that their trophic role was more variable than in the larger river (piscivorous). This study provides data from the unstudied pristine coastal rivers in Patagonia and reveals that interactions between native and introduced species can vary at very local spatial scales. 相似文献
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