Otolith microchemistry and diadromy in Patagonian river fishes

PeerJ

article

Dominique Alò¹  Cristian Correa³  Horacio Samaniego²  Corey A. Krabbenhoft⁴  Thomas F. Turner⁴ 

[1] Departamento de Ecología, Pontificia Universidad Católica de Chile;Laboratorio de Ecoinformática, Instituto de Conservación Biodiversidad y Territorio, Universidad Austral de Chile;Instituto de Conservación Biodiversidad y Territorio, Universidad Austral de Chile;Department of Biology and Museum of Southwestern Biology, University of New Mexico;Department of Biological Sciences, Wayne State University

关键词: Nonnative species;    Pacific salmon;    Estuary;    Facultative migration;    Life history;    Hydropower;    LA-ICP-MS;   

DOI  :  10.7717/peerj.6149

学科分类：社会科学、人文和艺术（综合）

来源: Inra

【 摘 要 】

Coastal habitats in Chile are hypothesized to support a number of diadromous fish species. The objective of this study was to document migratory life histories of native galaxiids and introduced salmonids from a wide latitudinal range in Chilean Patagonia (39–48°S). Otolith microchemistry data were analysed using a recursive partitioning approach to test for diadromy. Based on annular analysis of Sr:Ca ratios, a diadromous life history was suggested for populations of native Aplochiton taeniatus, A. marinus, and Galaxias maculatus. Lifetime residency in freshwater was suggested for populations of A. zebra and G. platei. Among introduced salmonids, populations of Oncorhynchus tshawytscha and O. kisutch exhibited patterns consistent with anadromy, whereas the screened population of O. mykiss appeared restricted to freshwater. Salmo trutta exhibited variable patterns suggesting freshwater residency and possibly anadromy in one case. The capacity and geographic scope of hydropower development is increasing and may disrupt migratory routes of diadromous fishes. Identification of diadromous species is a critical first step for preventing their loss due to hydropower development.

【 授权许可】

CC BY