Wednesday, June 24, 2009

Perez-Losada et al. MPE 2009

The Aporrectodea caliginosa species complex includes the most abundant earthworms in grasslands and agricultural ecosystems of the Paleartic region. Historically this complex consisted of the following taxa: A. caliginosa s.s. Savigny, 1826, A. trapezoides Dugés (1828), A. tuberculata (Eisen, 1874), and A. nocturna Evans (1946). These four taxa are morphologically very similar and difficult to differentiate because of their morphological variability. Consequently, their taxonomic status and their phylogenetic relationships have been a matter of discussion for more than a century. To study these questions, we sequenced the COII (686 bp), 12S (362 bp), 16S (1200 bp), ND1 (917 bp), and tRNAsAsn-Asp-Val-Leu-Ala-Ser-Leu (402 bp) mitochondrial and 28S (809 bp) nuclear gene regions for 85 European earthworms from 27 different localities belonging to the A. caliginosa species complex and four outgroup taxa. DNA sequences were analyzed using maximum parsimony, maximum likelihood, and Bayesian approaches of phylogenetic inference. The resulting trees were combined with morphological, ecological, and genomic evidence to test species boundaries (i.e., integrative approach). Our molecular analyses showed that A. caliginosa s.s. and A. tuberculata form a sister clade to A. trapezoidesA. longa, and A. nocturna, which indicates that A. longa is part of the A. caliginosa species complex. We confirm the species status of all these taxa and identify two unrecognized Aporrectodea species in Corsica (France). Moreover our analyses also showed the presence of highly divergent lineages within A. caliginosaA. trapezoides, and A. longa, suggesting the existence of cryptic diversity within these taxa.

Perez-Losada, M., R. Maigualida, J.C. Marshall, and J. Dominguez (2009) Phylogenetic assessment of the earthworm Aporrectodea caliginosa species complex (Oligochaeta: Lumbricidae) based on mitochondrial and nuclear DNA sequences. Molecular Phylogenetics and Evolution 52: 293–302

Evolution Meetings, Moscow, Idaho 2009

Weber State undergraduate student Paul Buttars presents the poster:

In the Academic Job Market, Will You Be Competitive? A Case Study in Ecology and Evolutionary Biology

Jonathon C. Marshall1*, Paul Buttars1, Thomas Callahan2, John J. Dennehy3, D. James Harris4, Bryce Lunt2, and Robert Shupe2

1Dept. of Zoology, Weber State University, Ogden, UT, USA; 2Dept. of Biology Southern Utah University, Cedar City, UT, USA; 3Queens College and the Graduate Center of the City University of New York, Flushing, NY, USA; 4Centro de Investigação em Biodiversidade e Recursos Genéticos, Vairão, Portugal.