Phylogenetic relationships elucidate colonization patterns in the intertidal grazers Osilinus Philippi, 1847 and Phorcus Risso, 1826 (Gastropoda: Trochidae) in the northeastern Atlantic Ocean and Mediterranean Sea


Donald, Kirsten M., Preston, Joanne, Williams, Suzanne T., Reid, David G., Winter, David, Alvarez, Raquel, Buge, Barbara, Hawkins, Stephen J., Templado, Jose and Spencer, Hamish G. (2012) Phylogenetic relationships elucidate colonization patterns in the intertidal grazers Osilinus Philippi, 1847 and Phorcus Risso, 1826 (Gastropoda: Trochidae) in the northeastern Atlantic Ocean and Mediterranean Sea. Molecular Phylogenetics and Evolution, 62, (1), 35-45. (doi:10.1016/j.ympev.2011.09.002).

Download

[img] PDF - Publishers print
Restricted to System admin

Download (2341Kb) | Request a copy

Description/Abstract

Snails in the closely related trochid genera Phorcus Risso, 1826 and Osilinus Philippi, 1847 are ecologically important algal grazers in the intertidal zone of the northeastern Atlantic Ocean and Mediterranean Sea. Here we present the first complete molecular phylogeny for these genera, based on the nuclear 28S rRNA gene and the mitochondrial 16S rRNA and COI genes, and show that the current classification is erroneous. We recognize nine species in a single genus, Phorcus: estimated by BEAST analysis, this arose 30 (±10) Ma; it consists of two subgenera, Phorcus and Osilinus, which we estimate diverged 14 (±4.5) Ma. Osilinus kotschyi, from the Arabian and Red Seas, is not closely related and is tentatively referred to Priotrochus Fischer, 1879. Our phylogeny allows us to address biogeographical questions concerning the origins of the Mediterranean and Macaronesian species of this group. The former appear to have evolved from Atlantic ancestors that invaded the Mediterranean on several occasions after the Zanclean Flood, which ended the Messinian Salinity Crisis 5.3 Ma; whereas the latter arose from several colonizations of mainland Atlantic ancestors within the last 3 (±1.5) Ma.

Item Type: Article
ISSNs: 1055-7903 (print)
1095-9513 (electronic)
Keywords: Atlantic; Dispersal; Mediterranean; Osilinus; Phorcus; Priotrochus; Tethyan realm
Subjects: G Geography. Anthropology. Recreation > GC Oceanography
Q Science > QH Natural history > QH301 Biology
Divisions: Faculty of Natural and Environmental Sciences > Ocean and Earth Science > Ocean Biochemistry & Ecosystems
ePrint ID: 337007
Date Deposited: 13 Apr 2012 12:20
Last Modified: 27 Mar 2014 20:20
URI: http://eprints.soton.ac.uk/id/eprint/337007

Actions (login required)

View Item View Item