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Act now before its too late: Copper exposure drives chemo-ecology of predator-prey dynamics of freshwater common spiny loach, Lepidocephalichthys thermalis (Valenciennes, 1846)
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SYSNO ASEP 0539249 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Act now before its too late: Copper exposure drives chemo-ecology of predator-prey dynamics of freshwater common spiny loach, Lepidocephalichthys thermalis (Valenciennes, 1846) Author(s) Gosavi, S.M. (IN)
Tapkir, Sandip Dnyaneshwar (BC-A) RID, ORCID
Kumkar, P. (CZ)
Verma, C.R. (IN)
Kharat, S.S. (IN)Number of authors 5 Article number 109509 Source Title Environmental Research. - : Elsevier - ISSN 0013-9351
Roč. 186, č. 4 (2020), s. 1-12Number of pages 12 s. Language eng - English Country US - United States Keywords Learning ; Olfaction ; Survival ; Info-disruption ; Cognition ; Alarm cues Subject RIV EH - Ecology, Behaviour OECD category Ecology Method of publishing Limited access Institutional support BC-A - RVO:60077344 UT WOS 000548186300043 EID SCOPUS 85083315734 DOI https://doi.org/10.1016/j.envres.2020.109509 Annotation Due to the extensive use of copper (Cu) in various commercial products, its existence in aquatic bodies (freshwater and marine) is not unusual. Cu is well known for its effect on the olfactory physiology of fish. However, there are limited studies on the effect of Cu on important ecological functions in fish (predator-prey dynamics) that are primarily influenced by olfaction. In a series of experiments, we studied the effect of Cu exposure on the chemoreceptive behavior of the prey fish, Lepidocephalichthys thermalis. Prey fishes were exposed to an environmentally relevant concentration (5 mu g/L) of Cu for 3 h and the anti-predator responses against native (Channa gachua) and alien predatory fish (tilapia) were quantified using an ethological assay. Cu exposed prey fishes did not recognize the native predator and had a lower survival rate than control (unexposed) fishes in predation trials. Cu exposed prey fishes have failed to learn associatively to detect a non-native predator resulting in higher mortality in prey population in direct encounters with tilapia. However, such a lack of predator recognition was found to be short-term and the treated prey fishes recovered anti-predator responses within 72 h. In addition, Cu inactivated the alarm cue which acts as a signal for the presence of predators and ensures associative learning and therefore it was considered to be an 'info-disruptor' in the present study. These outcomes together demonstrate that even at low concentration, Cu influences ecological decisions and survival against predators. Owing to the ubiquitous occurrence of Cu in water bodies, the present investigation will contribute to the knowledge of how environmental stressors alter the crucial ecological decisions of prey individuals in aquatic ecosystems. In addition, we suggest that freshwater reservoirs containing high levels of Cu could be unsuitable for the long-term survival of prey fishes and freshwater biodiversity. Workplace Biology Centre (since 2006) Contact Dana Hypšová, eje@eje.cz, Tel.: 387 775 214 Year of Publishing 2021 Electronic address https://doi.org/10.1016/j.envres.2020.109509
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