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Occurrence of the siphonophore Muggiaea atlantica in Scottish coastal waters: source or sink?

Occurrence of the siphonophore Muggiaea atlantica in Scottish coastal waters: source or sink?
Occurrence of the siphonophore Muggiaea atlantica in Scottish coastal waters: source or sink?
We applied the concept of source-sink dynamics to investigate a recent (1999–2013) increase in the occurrence of the siphonophore Muggiaea atlantica in Scottish coastal waters. Our aim was to determine whether this change represented the establishment of resident populations (i.e. ‘sources’), or transient populations reliant on immigration (i.e. ‘sinks’). First, we show that local production was not always sufficient to account for recruitment (a ‘source’ prerequisite), suggesting reliance on immigration (a ‘sink’ prerequisite). Using variation partitioning we then discriminated between the exclusive effects of immigration (indexed by the European Slope Current [ESC]), and local production (indexed by local sea temperature and food availability). On the west coast (Loch Ewe), interannual variability in the species’ abundance was determined by, in order of increasing importance: (1) suitable local environmental conditions (13%); (2) the role of the ESC in modulating these conditions (20%); and (3) immigration via the ESC (29%). These results provided a strong indication that Loch Ewe represents a sink habitat for M. atlantica. However, on the east coast (Stonehaven) our results were less conclusive, probably due to the less direct influence of the ESC. For both locations we suggest that low winter temperatures prevented overwintering, necessitating annual re-colonisation via immigration.
siphonophore, jellyfish, range expansion, source–sink dynamics, source, sink, biogeography, gelatinous zooplankton, bloom
0142-7873
122-137
Blackett, Michael
5509d5a0-ad61-45cc-92e4-284831f6bb9c
Lucas, Cathy H.
521743e3-b250-4c6b-b084-780af697d6bf
Cook, Katherine
a25c31c2-f692-4ede-b6ff-4cce7819985f
Licandro, Priscilla
9fa7117e-fc96-4e36-9bd1-93e9bcc8e8f5
Blackett, Michael
5509d5a0-ad61-45cc-92e4-284831f6bb9c
Lucas, Cathy H.
521743e3-b250-4c6b-b084-780af697d6bf
Cook, Katherine
a25c31c2-f692-4ede-b6ff-4cce7819985f
Licandro, Priscilla
9fa7117e-fc96-4e36-9bd1-93e9bcc8e8f5

Blackett, Michael, Lucas, Cathy H., Cook, Katherine and Licandro, Priscilla (2017) Occurrence of the siphonophore Muggiaea atlantica in Scottish coastal waters: source or sink? Journal of Plankton Research, 39 (1), 122-137. (doi:10.1093/plankt/fbw082).

Record type: Article

Abstract

We applied the concept of source-sink dynamics to investigate a recent (1999–2013) increase in the occurrence of the siphonophore Muggiaea atlantica in Scottish coastal waters. Our aim was to determine whether this change represented the establishment of resident populations (i.e. ‘sources’), or transient populations reliant on immigration (i.e. ‘sinks’). First, we show that local production was not always sufficient to account for recruitment (a ‘source’ prerequisite), suggesting reliance on immigration (a ‘sink’ prerequisite). Using variation partitioning we then discriminated between the exclusive effects of immigration (indexed by the European Slope Current [ESC]), and local production (indexed by local sea temperature and food availability). On the west coast (Loch Ewe), interannual variability in the species’ abundance was determined by, in order of increasing importance: (1) suitable local environmental conditions (13%); (2) the role of the ESC in modulating these conditions (20%); and (3) immigration via the ESC (29%). These results provided a strong indication that Loch Ewe represents a sink habitat for M. atlantica. However, on the east coast (Stonehaven) our results were less conclusive, probably due to the less direct influence of the ESC. For both locations we suggest that low winter temperatures prevented overwintering, necessitating annual re-colonisation via immigration.

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Accepted/In Press date: 30 October 2016
e-pub ahead of print date: 25 November 2016
Published date: 24 January 2017
Keywords: siphonophore, jellyfish, range expansion, source–sink dynamics, source, sink, biogeography, gelatinous zooplankton, bloom
Organisations: Ocean and Earth Science

Identifiers

Local EPrints ID: 402392
URI: http://eprints.soton.ac.uk/id/eprint/402392
ISSN: 0142-7873
PURE UUID: 797030fe-38c5-4745-a0b9-717e638b88d0
ORCID for Cathy H. Lucas: ORCID iD orcid.org/0000-0002-5929-7481

Catalogue record

Date deposited: 07 Nov 2016 09:26
Last modified: 20 Jul 2019 01:20

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