Feeding by larvae of intertidal invertebrates: assessing their position in pelagic food webs

Ecology
Cristian A VargasS A Navarrete

Abstract

One of the leading determinants of the structure and dynamics of marine populations is the rate of arrival of new individuals to local sites. While physical transport processes play major roles in delivering larvae to the shore, these processes become most important after larvae have survived the perils of life in the plankton, where they usually suffer great mortality. The lack of information regarding larval feeding makes it difficult to assess the effects of food supply on larval survival, or the role larvae may play in nearshore food webs. Here, we examine the spectrum of food sizes and food types consumed by the larvae of two intertidal barnacle species and of the predatory gastropod Concholepas concholepas. We conducted replicated experiments in which larvae were exposed to the food size spectrum (phytoplankton, microprotozoan and autotrophic picoplankton) found in nearshore waters in central Chile. Results show that barnacle nauplii and gastropod veligers are omnivorous grazers, incorporating significant fractions of heterotrophs in their diets. In accordance with their feeding mechanisms and body size, barnacle nauplii were able to feed on autotrophic picoplankton (<5 microm) and did not consume the largest phytoplankto...Continue Reading

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Citations

Apr 29, 2016·PloS One·Julius A EllrichMarkus Molis
Dec 1, 2020·The Science of the Total Environment·Carlota MuñizNicolas Weidberg
Apr 28, 2021·Integrative and Comparative Biology·Emily N BranamKit Yu Karen Chan

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