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6 results for “Pisaster ochraceus”
Data from: Reciprocal abundance shifts of the intertidal sea stars, Evasterias troschelii and Pisaster ochraceus, following sea star wasting disease
Disease emergence occurs within the context of ecological communities, and disease driven declines in host populations can lead to complex direct and indirect ecological effects. Varying effects of a single disease among multiple susceptible hosts could benefit relatively resistant species. Beginning in 2013, an outbreak of sea star wasting disease (SSWD) led to population declines of many sea star species along the west coast of North America. Through field surveys and laboratory experiments, we investigated how and why the relative abundances of two co-occurring sea star species, Evasterias troschelii and Pisaster ochraceus, shifted during the ongoing wasting epidemic in Burrard Inlet, British Columbia, Canada. We hypothesized that Evasterias is competitively inferior to Pisaster but more resistant to SSWD. Thus, we predicted that SSWD-induced declines of Pisaster could mitigate the negative effects of SSWD on Evasterias, as the latter would experience competitive release. We document shifts in sea star abundance from 2007-2017: Pisaster abundance and mean size declined during the outbreak, while Evasterias abundance increased from relatively rare to numerically dominant within the intertidal. When exposed to symptomatic sea stars, Pisaster and Evasterias both showed signs of SSWD, but transmission and susceptibility was lower in Evasterias. Despite diet overlap documented in our field surveys, Evasterias was not outcompeted by Pisaster in laboratory trails conducted with the relatively small Pisaster available after the outbreak. Interference competition with larger Pisaster, or prey exploitation by Pisaster during summer when Evasterias is primarily subtidal, may explain the rarity of Evasterias prior to Pisaster declines. Our results suggest that indirect effects mediated by competition can mask some of the direct effects of disease outbreaks, and the combination of direct and indirect effects will determine the restructuring of a community after disturbance.
Data from: Reciprocal abundance shifts of the intertidal sea stars, Evasterias troschelii and Pisaster ochraceus, following sea star wasting disease
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Variable energy storage and growth in the sea star Pisaster ochraceus
<p>The complete data set describes environmentally based variation in size-specific energy storage (dry mass pyloric caeca/dry body mass) and growth of live mass of the intertidal sea star <em>Pisaster ochraceus </em>in British Columbia, Canada. Variation in energy storage and live mass correspond to (1) naturally occurring or (2) experimentally induced changes in the zonation of their prey, the sea mussel <em>Mytilus californianus</em> and associated species. The relevant features of mussel zonation are the depth (vertical distance from a fixed tidal datum) of the lower boundary and the species/size composition of the lower boundary. Downward extensions of the boundaries comprised of masses of relatively young mussels incurred the greatest increases in energy storage and live mass.</p> <p>Data are presented in 4 files:</p> <p>(1) <em>Energy storage - Observational study</em>. Variation in energy storage at three sites sampled at irregular intervals from 2008 to 2014. Variables include live mass, dry mass of viscera, and dry mass of the remainder of the body of individual <em>Pisaster ochraceus</em>. Sample dates were chosen to represent natural inter-annual variation in mussel zonation, rather than tracking continuous time courses. </p> <p>(2) <em>Storage-boundary depth relationships</em>. Variables derived from observational study and include summary measures of energy storage (slope of the linear regression of dry viscera mass to dry body mass, for dry body masses< 120 g); boundary depth (vertical distance from tidal datum); and the qualitative composition of the lower boundary.</p> <p>(3) <em>Energy storage and live mass - Experimental study</em>. Records were made after 1-3 years of experimental manipulation of the mussel boundaries on experimental sites. Variables include initial live mass, final live mass, dry mass of viscera, and dry mass of the remainder of the body of individual <em>Pisaster ochraceus</em> recaptured in the three large-scale replicates of the translocation experiment. </p> <p>(4) <em>Boundary depth - Experimental study</em>. Variables include the type of boundary manipulation, the change in boundary shore levels with respect to conventional tidal data, the resulting composition of the lower boundary, and years of manipulation. </p> <p>Further information on-site locations, methods of data acquisition, and definitions of the variables appear in Methods and Usage Notes below.</p>
Variable energy storage and growth in the sea star Pisaster ochraceus
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Data associated with: Minor genetic consequences of a major mass mortality: Short-term effects in Pisaster ochraceus
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Supporting Files for Schiebelhut LM, Puritz JB & Dawson MN (2018) "Decimation by sea star wasting disease and rapid genetic change in a keystone species, Pisaster ochraceus" PNAS
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