C. Held

Publications267
h-index38
Citations4,773
Highly Influential Citations160
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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… Expand
Cryptic mitochondrial lineages in the widespread pycnogonid Colossendeis megalonyx Hoek, 1881 from Antarctic and Subantarctic waters
TLDR
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. Expand
Molecular evidence for cryptic speciation within the widespread Antarctic crustacean Ceratoserolis trilobitoides (Crustacea, Isopoda)
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… Expand
Multiple rearrangements in mitochondrial genomes of Isopoda and phylogenetic implications.
TLDR
One of the first findings of homoplasy in mitochondrial gene order, namely a shared relative position of trnV in unrelated isopod lineages is reported, and modification in tRNAs and GC-skew inversion may be potentially fruitful subjects for future mt genome studies in a phylogenetic context. Expand
Phylogeny and biogeography of serolid isopods (Crustacea, Isopoda, Serolidae) and the use of ribosomal expansion segments in molecular systematics.
  • C. Held
  • Biology, Medicine
  • Molecular phylogenetics and evolution
  • 1 May 2000
TLDR
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. Expand
Cryptic speciation in the giant Antarctic isopod Glyptonotus antarcticus (Isopoda: Valvifera: Chaetiliidae)
TLDR
In a survey of within-species genetic diversity, 23 specimens of the benthic Antarctic isopod Glyptonotus antarcticus from three sampling areas around the Antarctic had a high genetic variability in their mitochondrial LSU (16S) gene, which may represent cryptic, but reproductively isolated species rather than a single species. Expand
Genetic and Morphological Divergences in the Cosmopolitan Deep-Sea Amphipod Eurythenes gryllus Reveal a Diverse Abyss and a Bipolar Species
TLDR
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. Expand
Long-distance island hopping without dispersal stages: transportation across major zoogeographic barriers in a Southern Ocean isopod
TLDR
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. Expand
Is the Species Flock Concept Operational? The Antarctic Shelf Case
TLDR
The present study contradicts the paradigm that marine species flocks are rare and proposes a new protocol which includes an iterative fine-tuning of the monophyly and endemicity criteria in order to discover unsuspected flocks. Expand
Cryptic speciation in a benthic isopod from Patagonian and Falkland Island waters and the impact of glaciations on its population structure
TLDR
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. Expand
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