Temporal constraints on predation risk assessment in a changing world

Chivers, Douglas P., Ramasamy, Ryan A., McCormick, Mark I., Watson, Sue-Ann, Siebeck, Ulrike E. and Ferrari, Maud C. O. (2014) Temporal constraints on predation risk assessment in a changing world. Science of the Total Environment, 500-501 332-338. doi:10.1016/j.scitotenv.2014.08.059

Author Chivers, Douglas P.
Ramasamy, Ryan A.
McCormick, Mark I.
Watson, Sue-Ann
Siebeck, Ulrike E.
Ferrari, Maud C. O.
Title Temporal constraints on predation risk assessment in a changing world
Journal name Science of the Total Environment   Check publisher's open access policy
ISSN 0048-9697
Publication date 2014-12-01
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.scitotenv.2014.08.059
Volume 500-501
Start page 332
End page 338
Total pages 7
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Abstract Habitat degradation takes various forms and likely represents the most significant threat to our global biodiversity. Recently, we have seen considerable attention paid to increasing global CO2 emissions which lead to ocean acidification (OA). Other stressors, such as changing levels of ultraviolet radiation (UVR), also impact biodiversity but have received much less attention in the recent past. Here we examine fundamental questions about temporal aspects of risk assessment by coral reef damselfish and provide critical insights into how OA and UVR influence this assessment. Chemical cues released during a predator attack provide a rich source of information that other prey animals use to mediate their risk of predation and are the basis of the majority of trait-mediated indirect interactions in aquatic communities. However, we have surprisingly limited information about temporal aspects of risk assessment because we lack knowledge about how long chemical cues persist after they are released into the environment. Here, we showed that under ambient CO2 conditions (~ 385 μatm), alarm cues of ambon damselfish (Pomacentrus amboinensis) did not degrade within 30 min in the absence of ultraviolet radiation (UVR), but were degraded within 15 min when the CO2 was increased to ~ 905 μatm. In experiments that used filters to eliminate UVR, we found minimal degradation of alarm cues within 30 min, whereas under ambient UVR conditions, alarm cues were completely degraded within 15 min. Moreover, in the presence of both UVR and elevated CO2, alarm cues were broken down within 5 min. Our results highlight that alarm cues degrade surprisingly quickly under natural conditions and that anthropogenic changes have the potential to dramatically change rates of cue degradation in the wild. This has considerable implications for risk assessment and consequently the importance of trait-mediated indirect interactions in coral-reef communities.
Keyword Global change
Ocean acidification
Ultraviolet radiation
Risk assessment
Alarm cues
Trait-mediated indirect effects
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Author post-print permissible - 12-48 months embargo.

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
School of Biomedical Sciences Publications
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