Environmental noise affects the fluctuations of Atlantic large pelagics

Type Article
Date 2010-07
Language English
Author(s) Rouyer Tristan1, 2, Fromentin Jean-Marc2, Stenseth Nils Chr.1, 3
Affiliation(s) 1 : Univ Oslo, CEES, Dept Biol, N-0316 Oslo, Norway.
2 : Ctr Rech Halieut Mediterraneenne & Trop, IFREMER, F-34203 Sete, France.
3 : Inst Marine Res, Dept Coastal Zone Studies, Flodevigen Res Stn, N-4817 His, Norway.
Meeting International Symposium on Climate Impacts on Oceanic Top Predators (CLIOTOP), La Paz, MEXICO, DEC 03-07, 2007
Source Progress In Oceanography (0079-6611) (Pergamon-elsevier Science Ltd), 2010-07 , Vol. 86 , N. 1-2 , P. 267-275
DOI 10.1016/j.pocean.2010.04.025
WOS© Times Cited 11
Abstract Environmental variables affect many processes of fish biology and their fluctuations are thought to be one of the main factors in variability of fish stocks. Recent work has shown that the variability of the environment in the frequency domain (i.e., the environmental noise) can interact with endogenous processes (e.g., density dependence) and affect fluctuations of animal populations. In this study, we investigate whether fluctuations of large pelagics' time series are affected by environmental noise and whether life-history traits of species modulate this response. By analysing several environmental variables and a large dataset of tuna and billfish catch per unit effort (CPUE) time series from the Atlantic, we show that in environments dominated by long-term fluctuations (i.e., red noise) CPUE time series were less variable and displayed smoother fluctuations. Furthermore, larger, slower-growing and later-maturing species were found to be more sensitive to changes of environmental noise than species with a shorter turnover rate. Our results suggest that environmental noise interacts with fish biology; understanding how it is integrated into biological processes might provide important insights to understand the responses of fish stocks dynamics to exploitation and environmental changes. (C) 2010 Elsevier Ltd. All rights reserved.
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