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Non-lethal effects of an invasive species in the marine environment: the importance of early life-history stages

Non-lethal effects of an invasive species in the marine environment: the importance of early life-history stages
Non-lethal effects of an invasive species in the marine environment: the importance of early life-history stages
Studies examining the effects of invasive species have focussed traditionally on the direct/lethal effects of the invasive on the native community but there is a growing recognition that invasive species may also have non-lethal effects. In terrestrial systems, non-lethal effects of invasive species can disrupt early life-history phases (such as fertilisation, dispersal and subsequent establishment) of native species, but in the marine environment most studies focus on adult rather than early life-history stages. Here, we examine the potential for an introduced sessile marine invertebrate (Styela plicata) to exert both lethal and non-lethal effects on a native species (Microcosmus squamiger) across multiple early life-history stages. We determined whether sperm from the invasive species interfered with the fertilisation of eggs from the native species and found no effect. However, we did find strong effects of the invasive species on the post-fertilisation performance of the native species. The invasive species inhibited the settlement of native larvae and, in the field, the presence of the invasive species was associated with a ten-fold increase in the post-settlement mortality of the native species, as well as an initial reduction of growth in the native. Our results suggest that larvae of the native species avoid settling near the invasive species due to reduced post-settlement survival in its presence. Overall, we found that invasive species can have complex and pervasive effects (both lethal and non-lethal) across the early life-history stages of the native species, which are likely to result in its displacement and to facilitate further invasion.
fertilisation, invasive species, postmetamorphic performance, settlement, trait-mediated effects
0029-8549
873-882
Rius, Marc
c4e88345-4b4e-4428-b4b2-37229155f68d
Turon, Xavier
df0c3b35-aba1-4657-add0-3c6aee7c08d3
Marshall, Dustin J.
390571cc-09f2-4e17-af09-cd1ddf21aeef
Rius, Marc
c4e88345-4b4e-4428-b4b2-37229155f68d
Turon, Xavier
df0c3b35-aba1-4657-add0-3c6aee7c08d3
Marshall, Dustin J.
390571cc-09f2-4e17-af09-cd1ddf21aeef

Rius, Marc, Turon, Xavier and Marshall, Dustin J. (2009) Non-lethal effects of an invasive species in the marine environment: the importance of early life-history stages Oecologia, 159, (4), pp. 873-882. (doi:10.1007/s00442-008-1256-y).

Record type: Article

Abstract

Studies examining the effects of invasive species have focussed traditionally on the direct/lethal effects of the invasive on the native community but there is a growing recognition that invasive species may also have non-lethal effects. In terrestrial systems, non-lethal effects of invasive species can disrupt early life-history phases (such as fertilisation, dispersal and subsequent establishment) of native species, but in the marine environment most studies focus on adult rather than early life-history stages. Here, we examine the potential for an introduced sessile marine invertebrate (Styela plicata) to exert both lethal and non-lethal effects on a native species (Microcosmus squamiger) across multiple early life-history stages. We determined whether sperm from the invasive species interfered with the fertilisation of eggs from the native species and found no effect. However, we did find strong effects of the invasive species on the post-fertilisation performance of the native species. The invasive species inhibited the settlement of native larvae and, in the field, the presence of the invasive species was associated with a ten-fold increase in the post-settlement mortality of the native species, as well as an initial reduction of growth in the native. Our results suggest that larvae of the native species avoid settling near the invasive species due to reduced post-settlement survival in its presence. Overall, we found that invasive species can have complex and pervasive effects (both lethal and non-lethal) across the early life-history stages of the native species, which are likely to result in its displacement and to facilitate further invasion.

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More information

Published date: April 2009
Keywords: fertilisation, invasive species, postmetamorphic performance, settlement, trait-mediated effects
Organisations: Ocean Biochemistry & Ecosystems

Identifiers

Local EPrints ID: 354685
URI: http://eprints.soton.ac.uk/id/eprint/354685
ISSN: 0029-8549
PURE UUID: bf11c536-31e2-4dfa-8d56-6e9f703734b3

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Date deposited: 17 Jul 2013 12:10
Last modified: 18 Jul 2017 03:53

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Author: Marc Rius
Author: Xavier Turon
Author: Dustin J. Marshall

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