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2 results for “Early benthic phase”
Mendt & Gosselin 2021 Depleted energy reserves and early benthic phase mortality
<p>Insufficient energy reserves are widely considered to be a primary factor contributing to high rates of early benthic phase mortality among benthic marine invertebrates, but this hypothesis has been based mostly on indirect, observational evidence, and remains largely untested. We therefore examined the role of initial energy reserves in regulating survivorship and growth during the early benthic phase. Recently settled or hatched individuals of six invertebrate species were collected from natural populations, maintained without food, and their survivorship was monitored. Contrary to expectations, starved individuals of all six species had high survivorship through the critical first 10 d of the early benthic phase, with half of the species experiencing <2% mortality, and the remaining three species experiencing only 6 – 12% mortality. For five of the six species, 50% mortality was reached only after ≥50 d of starvation. Additionally, no difference in short-term survivorship was detected among starved individuals of three different size classes (a proxy for energy reserves) of <i>N. </i>ostrina hatchlings. Finally, the effect of different durations of delayed feeding (0 – 50 d) on recovery (i.e. growth and survivorship) once food was made available revealed that duration of starvation prior to feeding can nevertheless have significant longer-term impacts on the proportion of individuals that survive or their ability to grow. Together, these findings suggest that depleted energy reserves are not a primary cause of high mortality at the start of the early benthic phase, as had previously been hypothesized. Levels of energy reserves did influence growth, however, suggesting a possible indirect influence on performance by leaving individuals vulnerable for longer periods.</p>
Mendt & Gosselin 2021 Depleted energy reserves and early benthic phase mortality
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