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A comparison of population differentiation in two shore crab species with contrasting distribution along the Portuguese coast, using two morphological methodologies

Silva, Inês C, Hawkins, Stephen J. and Paula, José (2009) A comparison of population differentiation in two shore crab species with contrasting distribution along the Portuguese coast, using two morphological methodologies Marine and Freshwater Research, 60, (8), pp. 833-844. (doi:10.1071/MF08215).

Record type: Article

Abstract

Along the Portuguese coast, Pachygrapsus marmoratus has a continuous distribution on rocky shores. In contrast, Carcinus maenas has a discontinuous distribution, inhabiting estuaries. Surveys along a coastal latitudinal gradient were made to assess the effect of the distribution pattern on population differentiation of these two species. Population differentiation was studied using two different morphometric methodologies: linear-based morphometrics and landmark-based morphometrics. The linear-based analysis revealed no significant morphological differentiation among the eleven P. marmoratus populations. Landmark-based analysis showed that the northern and central populations were more similar in shape than the southern populations. Nevertheless, there was still some overlap in shape that could be due to the continuous distribution of P. marmoratus along the coast, promoting population panmixia. In C. maenas, both morphometric techniques revealed the existence of morphological differentiation among populations. This shape differentiation showed a clinal variation, explained by a higher degree of isolation of populations that might be due to limited larval flow between them. Environmental factors may also play an important role in causing variation of shape. Landmark-based morphometrics yielded stronger evidence of morphological differences among forms than a linear approach, suggesting that this method may be more suitable for analysis of body shape.

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Published date: 27 August 2009
Additional Information: DOI not working 18/05/11 but it was copied from article.
Keywords: Carcinus maenas, geometric morphometrics, Pachygrapsus marmoratus, traditional morphometrics

Identifiers

Local EPrints ID: 187789
URI: http://eprints.soton.ac.uk/id/eprint/187789
ISSN: 1323-1650
PURE UUID: 065c6290-3e36-4fbe-8964-55be72abece2

Catalogue record

Date deposited: 18 May 2011 10:55
Last modified: 18 Jul 2017 11:44

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Contributors

Author: Inês C Silva
Author: José Paula

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