Document of bibliographic reference 24350

BibliographicReference record

Type

Bibliographic resource

Type of document

Journal article

BibLvlCode

AS

Title

Is Syllis gracilis (Polychaeta : Syllidae) a species complex? An allozyme perspective

Abstract

The genetic relationships between morphologically indistinguishable marine and brackish populations of Syllis gracilis Grube, 1840 (Polychaeta: Syllidae) were studied by means of allozyme electrophoresis. Samples of S. gracilis from marine coastal and brackishwater habitats were examined for variation at 13 presumptive loci. In addition, a sample of the closely related species S. prolifera (Krohn, 1852) was analysed. Five loci were multiallelic in at least one population of S. gracilis and eight loci in S. prolifera. Low to moderate levels of within-population genetic variability were found, with average expected heterozygosity values ranging from H = 0.068 (+/-0.043 SE) to 0.187 (+/-0.069 SE) in the populations of S. gracilis; higher values were found in S. prolifera (H = 0.325 +/- 0.076). The presence of various private alleles indicated a marked genetic divergence among populations of S. gracilis, with Nei's genetic distances ranging from D = 0.000 to 0.833 and a highly significant F-ST value. Furthermore, evidence for strong genetic heterogeneity between two sympatric marine populations was found. UPGMA cluster analysis and multidimensional scaling pointed out a clear genetic divergence between brackish and marine populations. At least two genetically divergent entities occurred in marine and brackish habitats. This could be due to local adaptation of individuals coming from marine populations to brackish habitats, but more presumably to the occurrence of a species complex within S. gracilis.

WebOfScience code

https://www.webofscience.com/wos/woscc/full-record/WOS:000088186100013

Bibliographic citation

Maltagliati, F.; Peru, A.P.; Casu, M.; Rossi, F.; Lardicci, C.; Curini-Galletti, M.C.; Castelli, A. (2000). Is Syllis gracilis (Polychaeta : Syllidae) a species complex? An allozyme perspective. Mar. Biol. (Berl.) 136(5): 871-879. https://dx.doi.org/10.1007/s002270000288

Topic

Marine

Brakish water

Is peer reviewed

true