Maladaptive behavior reinforces a recruitment bottleneck in newly settled fishes |
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Authors: | Lee A Fuiman Mark G Meekan Mark I McCormick |
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Institution: | (1) Marine Science Institute, The University of Texas at Austin, 750 Channel View Drive, Port Aransas, TX 78373, USA;(2) Australian Institute of Marine Science, UWA Ocean Sciences Centre (MO96), 35 Stirling Highway, Crawley, WA, 6009, Australia;(3) School of Marine and Tropical Biology, James Cook University, Townsville, QLD, 4811, Australia |
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Abstract: | Settlement from the plankton ends the major dispersive stage of life for many marine organisms and exposes them to intense
predation pressure in juvenile habitats. This predation mortality represents a life-history bottleneck that can determine
recruitment success. At the level of individual predator–prey interactions, prey survival depends upon behavior, specifically
how behavior affects prey conspicuousness and evasive ability. We conducted an experiment to identify behavioral traits and
performance levels that are important determinants of which individuals survive or die soon after settlement. We measured
a suite of behavioral traits on late stage, pre-settlement Ward's damsel (Pomacentrus
wardi) collected using light traps. These behavioral traits included two measures of routine swimming (indicators of conspicuousness)
and eight measures of escape performance to a visual startle stimulus. Fish were then released onto individual patch reefs,
where divers measured an additional behavioral trait (boldness). We censused each patch reef until approximately 50% of the
fish were missing (~24 h), which we assumed to be a result of predation. We used classification tree analysis to discriminate
survivors from fish presumed dead based on poor behavioral performance. The classification tree revealed that individuals
displaying the maladaptive combination of low escape response speed, low boldness on the reef, and high routine swimming speed
were highly susceptible to predation (92.4% with this combination died within 24 h). This accounted for 55.2% of all fish
that died. Several combinations of behavioral traits predicted likely survival over 24 h, but there was greater uncertainty
about that prediction than there was for fish that were predicted to die. Thus maladaptive behavioral traits were easier to
identify than adaptive traits. |
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