Biogeographic Atlas of the Southern Ocean
The Southern Ocean waters to the west of the Antarctic Peninsula are warming faster than almost any other place on Earth. This area of most rapid environmental change was among others targeted by the…
Molecular evidence for cryptic speciation within the widespread Antarctic crustacean Ceratoserolis trilobitoides (Crustacea, Isopoda)
- C. Held
The phylogenetic relationships of 14 species of the Antarctic amphipod families Epimeriidae and Iphimediidae were investigated using 553 bp of the gene for the mitochondrial cytochrome oxidase…
Cryptic mitochondrial lineages in the widespread pycnogonid Colossendeis megalonyx Hoek, 1881 from Antarctic and Subantarctic waters
- Kathrin Krabbe, F. Leese, C. Mayer, R. Tollrian, C. Held
- Biology, Environmental SciencePolar Biology
- 4 March 2010
The data strongly support that nominal Colossendeis megalonyx consists of at least five cryptic and one pseudocryptic mitochondrial lineages, four of which appear to be geographically restricted, thus indicating high levels of gene flow or recent colonization in the Antarctic.
Multiple rearrangements in mitochondrial genomes of Isopoda and phylogenetic implications.
Phylogeny and biogeography of serolid isopods (Crustacea, Isopoda, Serolidae) and the use of ribosomal expansion segments in molecular systematics.
- C. Held
- BiologyMolecular Phylogenetics and Evolution
- 1 May 2000
A V4 expansion segment is reported which exceeds the longest crustacean sequences known until now by more than 270 bp, indicating that all Antarctic species in this study form a monophyletic group which has probably derived from species with closest extant relatives in South America.
Genetic and Morphological Divergences in the Cosmopolitan Deep-Sea Amphipod Eurythenes gryllus Reveal a Diverse Abyss and a Bipolar Species
The results indicate that, despite the more uniform environment of the abyss and its presumed lack of obvious isolating barriers, abyssal populations might be more likely to show population differentiation and undergo speciation events than previously assumed.
Long-distance island hopping without dispersal stages: transportation across major zoogeographic barriers in a Southern Ocean isopod
It is concluded that rare long-distance dispersal rather than vicariance or human-mediated transport must be responsible for the observed patterns of gene flow in Septemserolis septemcarinata, a strictly benthic species lacking pelagic larvae and the ability to swim.
Cryptic speciation in a benthic isopod from Patagonian and Falkland Island waters and the impact of glaciations on its population structure
- F. Leese, Anna Kop, J. Wägele, C. Held
- Biology, Environmental ScienceFrontiers in Zoology
- 19 December 2008
The results of this study indicate limited gene flow between distant populations of the brooding isopod Serolis paradoxa, and suggest that the only recently inundated Strait of Magellan was colonized by different source populations, most likely from Atlantic and Pacific coastal waters.
No evidence for slow-down of molecular substitution rates at subzero temperatures in Antarctic serolid isopods (Crustacea, Isopoda, Serolidae)
- C. Held
- BiologyPolar Biology
- 1 July 2001
The results show that temperature is not the key determinant of the rate of nucleotide change as has been suggested by the molecular slow-down hypothesis.
Gene expression profiling in gills of the great spider crab Hyas araneus in response to ocean acidification and warming
The findings indicate a PCO2 dependent threshold beyond which compensation by acclimation fails progressively and indicate a limited ability of this stenoecious crustacean to compensate for the effects of ocean acidification with and without concomitant warming.