Impact of warming on the physiological condition of ridged-eye flounder Pleuronichthys lighti during the summer in the c
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ORIGINAL ARTICLE
Impact of warming on the physiological condition of ridged-eye flounder Pleuronichthys lighti during the summer in the central Seto Inland Sea, Japan Masayuki Yamamoto 1
&
Takeshi Tomiyama 2 & Jun Shoji 3
Received: 6 November 2018 / Accepted: 8 June 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Ridged-eye flounder Pleuronichthys lighti is a commercially important flatfish in East Asia. Water temperature has been increasing in the central Seto Inland Sea, Japan, with high levels (> 25 °C) in the bottom layer for 1–2 months during the summer since 1994. To study possible impact of warming on the physiological condition of the flounder, we examined the feeding activity and somatic condition of the flounder monthly from July to November in 1999–2006. Stomach content weight decreased during period with high water temperature > 25 °C from August to September, and physiological condition from August to November. Generalized linear mixed models suggested the negative effects of water temperature on stomach weight, while water temperature did not explain the variability in the physiological condition of the flounder. However, the decrease in relative condition factor from August to September was greater in the year with higher water temperature in this period. These results suggest that high water temperature during the summer in recent years appears to have been unfavorable for the flounder through negative impacts on their feeding and somatic condition. Keywords Flatfish . Feeding activity . Global warming . Stomach contents index . Relative condition factor
Introduction Water temperature is an essential factor for determining fish distribution through the effects on vital rates (Perry et al. 2005; Last et al. 2011; Barbeaux and Hollowed 2018). The increase in water temperature associated with global warming has been reported to induce changes in fish fauna (Masuda 2008; Lloyd et al. 2012; Communicated by Dror Angel Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10113-020-01672-z) contains supplementary material, which is available to authorized users. * Masayuki Yamamoto [email protected] 1
Kagawa Prefectural Fisheries Experimental Station, 75-5 Yashima-higashi, Takamatsu, Kagawa 761-0111, Japan
2
Graduate School of Biosphere Science, Hiroshima University, Higashi, Hiroshima 739-8528, Japan
3
Marine Biological Research Institute of Japan, Shinagawa, Tokyo 142-0042, Japan
Tose et al. 2017), reproduction (Villegas-Hernandez et al. 2015; Serrant et al. 2018), and stock size (Sabatés et al. 2006; Hermant et al. 2010; Sparrevohn et al. 2013; Teixeira et al. 2014; Mavruk et al. 2017; Yeung and Yang 2017; Yamamoto et al. 2020). In addition, many scientists have predicted that global warming will affect functions of marine ecosystems and fishery production through influencing individual species and communities (Kuwahara et al. 2006; Brander 2007; Hare and Able 2007). To predict the potential impacts of global warming
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