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Olfactory cues of risk and visual cues of safety interact with sympatry and phylogeny in sha** behavioral responses by littoral fishes

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Abstract

Prey incorporate information about risk, safety, and the reliability of both of these cues when assessing risk of predation. Here, we report results of an experiment testing avoidance of chemical alarm cues derived from skin extract of blacknose shiners, Notropis heterolepis (BNS), attraction toward a visible shoal of five BNS, and the combination of both, on fishes in Deming Lake where BNS occur. We then repeated the experiment in nearby Budd Lake where BNS do not occur. BNS avoided traps with conspecific alarm cues but did not respond to the presence of BNS shoals. We recorded responses by similar-sized heterospecifics that share predators with BNS to see if they respond to BNS as indicators of risk and safety. Fathead minnows, Pimephales promelas (FHM) avoided traps chemically labeled with BNS alarm cue when a shoal was absent and avoided BNS shoals when traps were labeled with water (control). When both BNS alarm cue and BNS shoal were combined, FHM antipredator response to BNS alarm cue invoked a shoaling response with the BNS shoal in the trap. The more distantly related redbelly dace, Chrosomus eos (RBD), responded weakly to BNS cues in Deming Lake and ignored them in Budd Lake. Non-cyprinid species (brook stickleback Culaea inconstans and pumpkinseed sunfish, Lepomis gibbosus) did not respond to either olfactory or visual cues of BNS in Deming Lake. In Budd Lake, neither avoidance of BNS alarm cue or attraction to BNS shoals surpassed the threshold of statistical significance, indicating a role of ecological familiarity and learned recognition of risk and safety in cross-species reactions to olfactory and visual cues of heterospecifics.

Significance statement

Small fish, such as minnows, avoid areas marked by injury-released chemical cues because these cues are released only in the context of predation and are attracted to groups of fish because shoals offer safety from predation. In this study fathead minnows Pimephales promelas (FHM) avoided alarm cue of blacknose shiners Notropis heterolepis (BNS) in Deming Lake where both species occur but not in Budd Lake where BNS do not occur. FHM were not attracted to BNS shoals in either lake. However, when a shoal of BNS was combined with BNS alarm cue a synergism occurred where antipredator responses to BNS alarm cue induced FHM to seek safety by shoaling with BNS shoals. The synergism occurred in Deming Lake where BNS alarm cue and shoals are ecologically familiar but not in Budd Lake where BNS do not occur. These data show that behavioral responses by prey to olfactory and visual cues are tempered by sympatry (ecological familiarity) and confidence in the reliability of those cues.

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https://datadryad.org/stash/share/9gUG3yDqxV0Cd46kMmi5TqwF_zeN7JQGDk9T0PzLL6k.

Key to variables in dataset: Deming1Budd2 = source lake of catch data, SpongeAlarm1Water2 = chemical content of sponge, JarShoalYes1No2 = whether the jar contained a shoal or not, Set = replicate set within each lake. FHM = number of fathead minnows per trap, FHMrank = rank of fathead minnow catch per trap within lake, RBD = number of northern redbelly dace per trap, rbdrank = rank of redbelly dace catch per trap within lake, BNS = number of blacknose shiners per trap, bnsrank = rank of blacknose shiner catch per trap in Deming Lake, PKS = number of pumpkinseed sunfish per trap, pksrank = rank of pumpkinseed sunfish per trap in Deming Lake, Stickleback = number of brook stickleback per trap, sbrank = rank of stickleback per trap in Deming Lake.

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Acknowledgements

We are grateful to two anonymous reviewers for constructive suggestions that improved the clarity and impact of this manuscript.

Funding

Funding for supplies was provided by the Itasca Biological Field Station, College of Biological Sciences, University of Minnesota. CMA, BJS and MAS were supported by the Environmental & Conservation Sciences Graduate program.

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Correspondence to Brian D. Wisenden.

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All applicable international, national, and/or institutional guidelines for the use of animals were followed. All protocols used in this study were reviewed and approved by the University of Minnesota Institutional Animal Care and Use Committee, protocol 2103-38900A.

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The authors have no relevant financial or non-financial interests to disclose.

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Communicated by C. C Ioannou

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Wisenden, B.D., Andebrhan, A.A., Anderson, C.M. et al. Olfactory cues of risk and visual cues of safety interact with sympatry and phylogeny in sha** behavioral responses by littoral fishes. Behav Ecol Sociobiol 77, 91 (2023). https://doi.org/10.1007/s00265-023-03367-x

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