title: Rethinking competence in marine life cycles: ontogenetic changes in the settlement response of sand dollar larvae exposed to turbulence.
abstract: Complex life cycles have evolved independently numerous times in marine animals as well as in disparate algae. Such life histories typically involve a dispersive immature stage followed by settlement and metamorphosis to an adult stage on the sea floor. One commonality among animals exhibiting transitions of this type is that their larvae pass through a 'precompetent' period in which they do not respond to localized settlement cues, before entering a 'competent' period, during which cues can induce settlement. Despite the widespread existence of these two phases, relatively little is known about how larvae transition between them. Moreover, recent studies have blurred the distinction between the phases by demonstrating that fluid turbulence can spark precocious activation of competence. Here, we further investigate this phenomenon by exploring how larval interactions with turbulence change across ontogeny, focusing on offspring of the sand dollar Dendraster excentricus (Eschscholtz). Our data indicate that larvae exhibit increased responsiveness to turbulence as they get older. We also demonstrate a likely cost to precocious competence: the resulting juveniles are smaller. Based upon these findings, we outline a new, testable conception of competence that has the potential to reshape our understanding of larval dispersal and connectivity among marine populations.
authors.affiliation: Hopkins Marine Station of Stanford University , Pacific Grove, CA 93950, USA.
authors.forename: Jason
authors.initials: J
authors.lastname: Hodin
authors.affiliation: San Francisco Bay National Estuarine Research Reserve and Department of Biology , San Francisco State University , Tiburon, CA 94920, USA.
authors.forename: Matthew C
authors.initials: MC
authors.lastname: Ferner
authors.affiliation: Bodega Marine Laboratory and Department of Evolution and Ecology , University of California at Davis , Bodega Bay, CA 94923, USA.
authors.forename: Gabriel
authors.initials: G
authors.lastname: Ng
authors.affiliation: Hopkins Marine Station of Stanford University , Pacific Grove, CA 93950, USA.
authors.forename: Christopher J
authors.initials: CJ
authors.lastname: Lowe
authors.affiliation: Bodega Marine Laboratory and Department of Evolution and Ecology , University of California at Davis , Bodega Bay, CA 94923, USA.
authors.forename: Brian
authors.initials: B
authors.lastname: Gaylord
keywords: Echinoidea; environmental cues; hydrodynamics; metamorphosis; recruitment; shear forces