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Phylogenetics and evolution of the Daphnia longispina group (Crustacea) based on 12S rDNA sequence and allozyme variation.
Phylogenetic inference provided evidence that similarities in cephalic crest shape likely resulted from convergent or parallel evolution among species, and endemism at the continental level was indicated for previously cosmopolitan species, but the estimated times of these divisions were inconsistent with vicariance events suggesting recent dispersal among continents. Expand
The origin and evolution of variable-region helices in V4 and V7 of the small-subunit ribosomal RNA of branchiopod crustaceans.
Evidence supports the classical view that Cladocera is a monophyletic group and that the cyclestheriids are transitional between spinicaudatans and cladocerans and indicates that mechanisms affecting length variation do so both across single genes and across genes in the rRNA gene family. Expand
Evolution of parental care and ovulation behavior in oysters.
Preliminary phylogenetic analyses indicate that the Ostreidae are robustly monophyletic, broadcast spawning and larval planktotrophy are ancestral ostreid traits, and trans-ctenidial ovulation predates the evolution of parental care in o Streid lineages. Expand
Testing paleolimnological predictions with molecular data: the origins of Holarctic Eubosmina
The results suggested that lacustrine bosminids are susceptible to geographic speciation processes, and that morphological interpretation of diversity in paleolimnology can be markedly improved by genetic studies. Expand
Seismic Prospecting for Gas-hydrate and Associated Free-gas Prospects in the Milne Point Area of Northern Alaska
In 1995, the U.S. Geological Survey conducted the first systematic assessment of the in-place natural-gas-hydrate resources of the United States. That study suggested that the permafrost-associatedExpand
Habitat-dependent hybrid parentage and differential introgression between neighboringly sympatric Daphnia species.
The results provided evidence for asymmetric interspecific gene flow involving alleles at six loci that are unlikely to be convergent or symplesiomorphic, and accounted for much of the genetic divergence between European and North American populations of D. galeata. Expand
Rate acceleration and long-branch attraction in a conserved gene of cryptic daphniid (Crustacea) species.
The nuclear large subunit (LSU) rRNA gene is a rich source of phylogenetic characters because of its large size, mosaic of slowly and rapidly evolving regions, and complex secondary structureExpand
Genetic distinctiveness of endangered dwarf blue sheep (Pseudois nayaur schaeferi): evidence from mitochondrial control region and Y-linked ZFY intron sequences.
It is proposed that dwarf blue sheep be designated as a subspecies of blue sheep, P. n. Expand
The Cormorant Field, Blocks 211/21a, 211/26a, UK North Sea
Abstract The Cormorant Oilfield is located approximately 150 km northeast of the Shetland Islands in Blocks 211/2la and 211/ 26a of the UK sector of the North Sea, in water depths of 500-550 ft. TheExpand
Map showing inferred and mapped basement faults, San Juan Basin and vicinity, New Mexico and Colorado
Interpretation of more than 1,100 mi (1,750 km) of seismic reflection data in the San Juan Basin and vicinity allowed us to map a large number of faults that have measurable offset at the top of theExpand