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Does structural change in the zooplankton community affect larval fish feeding in anthropogenically disturbed tropical waters?

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Abstract

Anthropogenic perturbations and climate change have altered the zooplankton community structure in the Klang Strait during the past 30 years, in that the taxa of large-bodied crustaceans (Acartiidae, Calanidae, Pseudodiaptomidae) are being replaced by those of small-bodied crustaceans (Oithonidae, Ectinosomatidae), gelatinous jellyfish, and appendicularians. Since zooplankton constitutes the main larval food, we questioned: have bottom-up effects impacted larval fish feeding via the food chain? Larval fish that were sampled previously (1985–1986) and nearly three decades thereafter (2013–2014) were analysed for their dietary composition. Despite the dramatic replacements of zooplankton taxa due to escalating anthropogenic disturbances, the dominant copepod families, Paracalanidae, Oithonidae and Euterpinidae, remain the major prey for fish larvae. Dietary shifts in prey composition from before to after impact depend on the larval fish family and their ontogenetic stage. Dietary changes are observed in the Bregmacerotidae, Engraulidae, Gobiidae and Sciaenidae that opportunistically feed on the small-bodied copepods (oithonids and Parvocalanus crassirostris), whereas the Callionymidae, Clupeidae and Cynoglossidae naturally feed on these copepods even before these prey become numerically dominant with anthropogenic disturbance. There is no dietary shift in the Leiognathidae, exceptional in that they are specialists feeding mainly on detritus and polychaete larvae. Since the bottom-up effects are not comprehensive among fish families and dietary plasticity is evident, it is postulated that only the intolerant or non-adaptable larval species are adversely affected by the environmental perturbations.

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Additional data related to this study are available upon reasonable request.

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Acknowledgements

We thank the University of Malaya for providing research facilities. We would also like to thank Dr. Konishi Yoshinobu for helping with the identification of some of the larval fish specimens. We acknowledge Goh Hao Chin for microtechnique assistance.

Funding

This study was funded by research grants from the Universiti Tunku Abdul Rahman awarded to Ooi AL (Research Fund (UTARRF) Cycle 2016/1), and the Ministry of Education Malaysia awarded to Chong VC (HIR grant no. H-21001–00-F000023).

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Ooi AL conceived study conception and design. Ooi AL and Chong VC obtained funding. Ooi AL and Teoh CY supervised the findings of this work. Chew LL and Chong VC carried out the field collection. Chew LL and Chu C did taxonomy identification. Chu C and Quah WC did the laboratory examinations. Quah WC performed data collection and analysis, and wrote the first draft of the manuscript. Chew LL, Chong VC and Ooi AL helped improved the manuscript. All authors discussed the results and approved the final manuscript.

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Correspondence to A. L. Ooi.

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This study is based on archived, formalin-preserved samples that do not need the approval of an animal care or ethics committee.

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The authors declare no competing interests.

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Quah, W.C., Chew, L.L., Chong, V.C. et al. Does structural change in the zooplankton community affect larval fish feeding in anthropogenically disturbed tropical waters?. Environ Biol Fish 105, 55–76 (2022). https://doi.org/10.1007/s10641-021-01189-2

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  • DOI: https://doi.org/10.1007/s10641-021-01189-2

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