Algae associated with coral degradation affects risk assessment in coral reef fishes

Abstract Habitat degradation alters the chemical landscape through which information about community dynamics is transmitted. Olfactory information is crucial for risk assessment in aquatic organisms as predators release odours when they capture prey that lead to an alarm response in conspecific pre...

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Autores principales:	Mark I. McCormick, Randall P. Barry, Bridie J. M. Allan
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/80b58bc869ed41af8d4c41666077a4d2
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spelling	oai:doaj.org-article:80b58bc869ed41af8d4c41666077a4d22021-12-02T15:06:13ZAlgae associated with coral degradation affects risk assessment in coral reef fishes10.1038/s41598-017-17197-12045-2322https://doaj.org/article/80b58bc869ed41af8d4c41666077a4d22017-12-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-17197-1https://doaj.org/toc/2045-2322Abstract Habitat degradation alters the chemical landscape through which information about community dynamics is transmitted. Olfactory information is crucial for risk assessment in aquatic organisms as predators release odours when they capture prey that lead to an alarm response in conspecific prey. Recent studies show some coral reef fishes are unable to use alarm odours when surrounded by dead-degraded coral. Our study examines the spatial and temporal dynamics of this alarm odour-nullifying effect, and which substratum types may be responsible. Field experiments showed that settlement-stage damselfish were not able to detect alarm odours within 2 m downcurrent of degraded coral, and that the antipredator response was re-established 20–40 min after transferral to live coral. Laboratory experiments indicate that the chemicals from common components of the degraded habitats, the cyanobacteria, Okeania sp., and diatom, Pseudo-nitzschia sp.prevented an alarm odour response. The same nullifying effect was found for the common red algae, Galaxauria robusta, suggesting that the problem is of a broader nature than previously realised. Those fish species best able to compensate for a lack of olfactory risk information at key times will be those potentially most resilient to the effects of coral degradation that operate through this mechanism.Mark I. McCormickRandall P. BarryBridie J. M. AllanNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-12 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Mark I. McCormick Randall P. Barry Bridie J. M. Allan Algae associated with coral degradation affects risk assessment in coral reef fishes
description	Abstract Habitat degradation alters the chemical landscape through which information about community dynamics is transmitted. Olfactory information is crucial for risk assessment in aquatic organisms as predators release odours when they capture prey that lead to an alarm response in conspecific prey. Recent studies show some coral reef fishes are unable to use alarm odours when surrounded by dead-degraded coral. Our study examines the spatial and temporal dynamics of this alarm odour-nullifying effect, and which substratum types may be responsible. Field experiments showed that settlement-stage damselfish were not able to detect alarm odours within 2 m downcurrent of degraded coral, and that the antipredator response was re-established 20–40 min after transferral to live coral. Laboratory experiments indicate that the chemicals from common components of the degraded habitats, the cyanobacteria, Okeania sp., and diatom, Pseudo-nitzschia sp.prevented an alarm odour response. The same nullifying effect was found for the common red algae, Galaxauria robusta, suggesting that the problem is of a broader nature than previously realised. Those fish species best able to compensate for a lack of olfactory risk information at key times will be those potentially most resilient to the effects of coral degradation that operate through this mechanism.
format	article
author	Mark I. McCormick Randall P. Barry Bridie J. M. Allan
author_facet	Mark I. McCormick Randall P. Barry Bridie J. M. Allan
author_sort	Mark I. McCormick
title	Algae associated with coral degradation affects risk assessment in coral reef fishes
title_short	Algae associated with coral degradation affects risk assessment in coral reef fishes
title_full	Algae associated with coral degradation affects risk assessment in coral reef fishes
title_fullStr	Algae associated with coral degradation affects risk assessment in coral reef fishes
title_full_unstemmed	Algae associated with coral degradation affects risk assessment in coral reef fishes
title_sort	algae associated with coral degradation affects risk assessment in coral reef fishes
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/80b58bc869ed41af8d4c41666077a4d2
work_keys_str_mv	AT markimccormick algaeassociatedwithcoraldegradationaffectsriskassessmentincoralreeffishes AT randallpbarry algaeassociatedwithcoraldegradationaffectsriskassessmentincoralreeffishes AT bridiejmallan algaeassociatedwithcoraldegradationaffectsriskassessmentincoralreeffishes
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Algae associated with coral degradation affects risk assessment in coral reef fishes

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