Journalartikel

Jahr der Veröffentlichung: 2002

Seiten: 1439-1451

Zeitschrift: Molecular Ecology

Bandnummer: 11

Heftnummer: 8

ISSN: 0962-1083

DOI Link: https://doi.org/10.1046/j.1365-294X.2002.01541.x

Verlag: Wiley

Abstract: 
The present study combines methods that were designed to infer intraspecific relationships (e.g. nested-clade analysis (NCA), mismatch distributions and maximum likelihood gene flow analysis) to analyse historic events and recurrent processes in the cryptic mud snail species Hydrobia acuta and H. glyca . Specifically, we test the proposed allopatry of cryptic species and whether the peculiar range-subdivision of the putative subspecies H. a. acuta and H. a. neglecta is a result of long-distance dispersal or continuous range expansion. The NCA indicates a past fragmentation of the two H. acuta subspecies as well as past fragmentations within H. glyca . Gene-flow analyses show extensive gene flow in an E-W direction (towards the Atlantic) in the Mediterranean H. a. acuta , generally low gene flow in a W-E direction in the Atlantic H. a. neglecta and complex gene-flow pattern in a N-S but also in a S-N direction (against the Gulf Stream) in H. glyca . Based on these data and supportive ecological and oceanographical data, we hypothesize that the separation of the two H. acuta subspecies was not caused by long-distance dispersal but by a range shift and/or range expansion of the closely related competitor H. glyca as a result of an interglacial warming with a subsequent range shift in H. acuta . Moreover, our data do not show evidence for a long-term, stable sympatry of Hydrobia species, supporting the concept of allopatric relationships within cryptic radiations. NCA and gene-flow analyses indicate that the only sympatric population found in our study is the result of a recent dispersal event from the nearby Mediterranean. It is assumed that allopatric relationships in ephemeral Hydrobia populations constitute an evolutionary advantage relative to competition, recruitment and re-establishment of habitats. Mechanisms that could be of relevance for maintaining allopatry are discussed.

Harvard-Zitierstil: Wilke, T. and Pfenninger, M. (2002) Separating historic events from recurrent processes in cryptic species: phylogeography of mud snails (Hydrobia spp.), Molecular Ecology, 11(8), pp. 1439-1451. https://doi.org/10.1046/j.1365-294X.2002.01541.x

APA-Zitierstil: Wilke, T., & Pfenninger, M. (2002). Separating historic events from recurrent processes in cryptic species: phylogeography of mud snails (Hydrobia spp.). Molecular Ecology. 11(8), 1439-1451. https://doi.org/10.1046/j.1365-294X.2002.01541.x