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The influence of invasive ascidian diets on the growth of the sea star Henricia sanguinolenta

Published online by Cambridge University Press:  23 February 2021

Kaitlin S. Van Volkom Open the ORCID record for Kaitlin S. Van Volkom [Opens in a new window] ,
Larry G. Harris  and
Jennifer A. Dijkstra
Kaitlin S. Van Volkom*
Affiliation:
Department of Biological Sciences, University of New Hampshire, DurhamNH, 03824, USA
Larry G. Harris
Affiliation:
Department of Biological Sciences, University of New Hampshire, DurhamNH, 03824, USA
Jennifer A. Dijkstra
Affiliation:
School of Marine Science and Ocean Engineering, University of New Hampshire, DurhamNH, 03824, USA
*
Author for correspondence: Kaitlin S. Van Volkom, E-mail: kv1011@wildcats.unh.edu
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Abstract

Invasive species can disrupt food webs by altering the abundance of prey species or integrating into the food web themselves. In the Gulf of Maine, there have been a suite of invasions that have altered the composition of the benthic ecosystem. These novel prey species can potentially benefit native predators depending on their nutritional value and relative abundance. We measured feeding instances of the native blood star, Henricia sanguinolenta, and changes in the seasonal abundances of invasive ascidian prey species. Results indicate that H. sanguinolenta forages optimally, as the blood star will prey on invasive ascidians when in high abundance, but feed on other species during periods of scarcity. Further, our study shows that blood stars prey on a wider variety of species than was previously known, such as small bivalves and barnacles. Additionally, we compared growth and reproduction of sea stars fed different combinations of invasive ascidians (Diplosoma listerianum or Botrylloides violaceus) or a native sponge (Haliclona oculata). Sea stars grew more on the native diet when compared with the invasive ascidian species, and D. listerianum appeared to be a superior quality food source when compared with B. violaceus. By comparing our data with historical data, we determined that there was a dramatic increase in sea star populations between 1980 and 2011, but then populations decreased by almost half from 2011 to 2016–2017. These data suggest that while invasive ascidians may have helped sea star populations at one point, sea stars are declining without their native food source.

Keywords

DietHenricia sanguinolentainvasivenon-nativenutritionpredatorpreysea star
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 101 , Issue 1 , February 2021 , pp. 151 - 157
Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of Marine Biological Association of the United Kingdom

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