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Invasion in tidal zones on complex coastlines: modelling larvae of the non-native Manila clam, Ruditapes philippinarum, in the UK

Record type: Article

Aim:? To evaluate whether natural larval transport and behaviour alone can explain the pattern of invasion and establishment of the non-indigenous Manila clam, Ruditapes philippinarum (Adams & Reeve, 1850), and its spread beyond the point of introduction in the UK.

Location:? The study is focused on Poole Harbour, south England, the point of introduction of the Manila clam in the UK.

Methods:? We use fine-resolution hydrodynamic models coupled with a water salinity model and an individual behaviour model of Manila clam larvae. The model was informed by experimental studies on the vertical response of larvae to salinity and field studies of the species in its natural and new environments.

Results:? Variations in the behavioural response of larvae to salinity in the model considerably affected the retention of clam larvae within the harbour. High levels of predicted larval retention occurred in two of five zones in the harbour when the salinity target was set at 17 practical salinity units. Persistently high densities of adult clams and recruits are accurately predicted in these regions.

Main conclusions:? Even within a relatively small region such as Poole Harbour, there is both localized retention of larvae or ‘closed’ areas and areas that are considerably more ‘open’ and potentially connected. The behavioural response of larvae to salinity significantly affected the degree of retention and ‘openness’ of the harbour to this species. Although, through natural transport, larvae could theoretically reach the next available habitat within the duration of their pelagic stage our study indicates that areas of sufficiently reduced salinity may be necessary for sufficient retention, recruitment and establishment of new adult populations in estuaries. High resolution hydrodynamic models, coupled with larval behaviour, can accurately simulate and predict biological invasion along complex coastlines and contribute to risk assessment of the introduction of non-indigenous species for aquaculture and spatial management of marine protection.

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Citation

Herbert, Roger J.H., Willis, Jay, Jones, Elfed, Ross, Kathryn, Hübner, Ralf, Humphreys, John, Jensen, Antony and Baugh, John (2012) Invasion in tidal zones on complex coastlines: modelling larvae of the non-native Manila clam, Ruditapes philippinarum, in the UK Journal of Biogeography, 39, (3), pp. 585-599. (doi:10.1111/j.1365-2699.2011.02626.x).

More information

Published date: March 2012
Keywords: Biological invasion, hydrodynamic models, individual behaviour model, Lagrangian model, larval connectivity, larval transport, Manila clam, marine protected areas, non-indigenous species, Ruditapes philippinarum
Organisations: Ocean Biochemistry & Ecosystems

Identifiers

Local EPrints ID: 336372
URI: http://eprints.soton.ac.uk/id/eprint/336372
ISSN: 0305-0270
PURE UUID: 65f074e1-fdf5-402b-96e1-20ac4442c010

Catalogue record

Date deposited: 22 Mar 2012 11:49
Last modified: 18 Jul 2017 06:08

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Contributors

Author: Roger J.H. Herbert
Author: Jay Willis
Author: Elfed Jones
Author: Kathryn Ross
Author: Ralf Hübner
Author: John Humphreys
Author: Antony Jensen
Author: John Baugh

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