Monsoonal wet season influences the migration tendency of a catadromous fish (barramundi Lates calcarifer).

Autor: Roberts BH; Research Institute for the Environment and Livelihoods, Charles Darwin University, Darwin, Northern Territory, Australia.; Fisheries Research, Department of Industry, Tourism and Trade, Berrimah, Northern Territory, Australia., Morrongiello JR; School of BioSciences, The University of Melbourne, Melbourne, Victoria, Australia., Morgan DL; Freshwater Fish Group & Fish Health Unit, Centre for Sustainable Aquatic Ecosystems, Harry Butler Institute, Murdoch University, Murdoch, Western Australia, Australia., King AJ; Research Institute for the Environment and Livelihoods, Charles Darwin University, Darwin, Northern Territory, Australia.; Centre for Freshwater Ecosystems, School of Life Sciences, La Trobe University, Albury-Wodonga, Victoria, Australia.; CSIRO Environment, Albury, New South Wales, Australia., Saunders TM; Fisheries Research, Department of Industry, Tourism and Trade, Berrimah, Northern Territory, Australia.; Department of Primary Industries, Port Stephens Fisheries Centre, Port Stephens, New South Wales, Australia., Banks SC; Research Institute for the Environment and Livelihoods, Charles Darwin University, Darwin, Northern Territory, Australia., Crook DA; Research Institute for the Environment and Livelihoods, Charles Darwin University, Darwin, Northern Territory, Australia.; Centre for Freshwater Ecosystems, School of Life Sciences, La Trobe University, Albury-Wodonga, Victoria, Australia.; Department of Primary Industries, Narrandera Fisheries Centre, Narrandera, New South Wales, Australia.
Jazyk: angličtina
Zdroj: The Journal of animal ecology [J Anim Ecol] 2024 Jan; Vol. 93 (1), pp. 83-94. Date of Electronic Publication: 2023 Nov 20.
DOI: 10.1111/1365-2656.14019
Abstrakt: Many animals exhibit partial migration, which occurs when populations contain coexisting contingents of migratory and resident individuals. This individual-level variation in migration behaviour may drive differences in growth, age at maturity and survival. Therefore, partial migration is widely considered to play a key role in shaping population demography. Otolith chemistry and microstructural analysis were used to identify the environmental- and individual-specific factors that influence migratory behaviour in the facultatively catadromous barramundi (Lates calcarifer) at two distinct life history stages: firstly, as juveniles migrating upstream into fresh water; and secondly, as adults or sub-adults returning to the estuarine/marine spawning habitat. Monsoonal climate played an important role in determining the migration propensity of juveniles: individuals born in the driest year examined (weak monsoon) were more than twice as likely to undergo migration to freshwater than those born in the wettest (strong monsoon) year. In contrast, the ontogenetic timing of return migrations to the estuary by adults and sub-adults was highly variable and not strongly associated with the environmental parameters examined. We propose that scarce resources within saline natal habitats during lower rainfall years may provide an ecological incentive for juveniles to migrate upstream, whereas more abundant resources in higher rainfall years may promote resident life histories within estuaries. We conclude that inter-annual climatic variation, here evidenced by monsoonal strength, likely plays an important role in driving the persistence of diversified life histories within wild barramundi populations.
(© 2023 The Authors. Journal of Animal Ecology published by John Wiley & Sons Ltd on behalf of British Ecological Society.)
Databáze: MEDLINE
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