2024-03-29T08:32:44Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/549962019-06-11T06:47:03Zcom_10261_77com_10261_8col_10261_330
00925njm 22002777a 4500
dc
Camacho Pérez, Ana I.
author
Torres, Trinidad José de
author
Ortiz Menéndez, José Eugenio
author
Valdecasas, Antonio G.
author
2006
An analysis was made of the micro-distribution patterns of five phylogenetically closely related species belonging to the genus Iberobathynella, a group of subterranean aquatic crustaceans
(Syncarida, Parabathynellidae). The two-step model of colonization and speciation seems to provide a valid explanation for the current distribution of a large number of stygobiontic taxa of marine origin (thalassoid). However, with respect to the Iberobathynella, only the colonization of
the subterranean environment at the mesoscale level can be explained. The second phase of the model, marine regression, can only explain the colonization of the region by the ancestor; the subsequent evolution and speciation at a smaller scale remain to be explained. Local geological
constraints – Upper Triassic gypsiferous mudstone deposits plus faults and thrusting linked to the Alpine Orogeny – are responsible for the appearance of local palaeogeographic phenomena. These
may have been the vicariant processes responsible for the geographical and genetic isolation of the ancestral populations of this group, which eventually led to clade divergence. Together with smallscale
passive dispersion (11 dispersal events) and local extinction, these processes could be
responsible for the current distribution of the five sister taxa inhabiting the caves of the Sierra de la Collada, Spain. A plausible palaeogeographical scenario is offered to explain their present distribution,
that clearly came about through chance events.
Biodiversity and Conservation (15):3527–3541 (2006)
0960-3115
http://hdl.handle.net/10261/54996
10.1007/s10531-004-1872-8
1572-9710
Crustacea
Evolution
Groundwater fauna
Iberian Peninsula
Palaeobiogeography
Parabathynellidae
Syncarida
Small-scale Biogeographical Patterns in some Groundwater Crustacea, the Syncarid, Parabathynellidae.