This study aims at a better understanding of the evolutionary significance of viviparity in some freshwater gastropods. We use a phylogeny based on partial sequences of the mitochondrial 16S gene of representatives of the limnetic and pantropical Pachychilidae to infer the relationships within this particular group of cerithioideans and the evolution of reproductive strategies. The phylogeny pr...

Global Change and Photosynthesis Research Unit, United States Department of Agriculture Agricultural Research Service, Departments of Plant Biology and Crop Sciences, Institute of Genomic Biology, University of Illinois, Urbana, Illinois 61801 (D.R.O.); Chinese Academy of Sciences-German Max Planck Society Partner Institute for Computational Biology and Institute of Plant Physiology and Ecology...

second line replace ‘2,000 mollusc species’ with ‘4,500 mollusc species’. Identifying important sites for conservation of freshwater biodiversity: extending the species-based approach

AUGUST 2004 AMERICAN METEOROLOGICAL SOCIETY | T he Laurentian Great Lakes (Fig. 1) comprise the United States’ premier surfacewater resource, with a basin area of 770,000 km2 (Coordinating Committee on Great Lakes Basic Hydraulic and Hydrologic Data 1977). The lakes cover an area of over 245,000 km2 and contain approximately 23,000 km3 of water. They contain about 18% of the world’s freshwater ...

Although studies of freshwater entomofauna frequently do not include the biodiversity and ecological roles of higher Diptera, cyclorraphous flies are often numerous and species rich in wetlands. Seventeen families are commonly found in freshwater wetlands, with Ephydridae, Chloropidae, Sciomyzidae, Sphaeroceridae, and Scathophagidae being among the most important in terms of population size and...

The freshwater crabs of the Neotropics comprise 311 species in two families (Pseudothelphusidae and Trichodactylidae) and one or both of these families are found in all of the countries in the Neotropical region (except for Chile and some of the Caribbean islands). Colombia (102 species, 81% endemic) and Mexico (67 species, 95% endemic) are the biodiversity hotspots of freshwater crab species r...

19.4 Examples of Cyanobacterial Habitats with High Exposure ....................................................... 485 19.4.1 Hot Springs ..................................................................... 485 19.4.2 Intertidal Marine and Hypersaline Habitats .................... 486 19.4.3 Benthic Freshwater Habitats ........................................... 487 19.4.4 Marine and Freshwat...

in aquatic ecosystems, pollutants including heavy metals cause pathological alternations in fishes. as, the impacts of pollutants are affected by chemical properties of water, this study was conducted to compare the histopathological effects of two heavy metals as and cd on gill structure of aphanius sophiae. a total of 350 specimens were collected from the shoor river of eshtehard during the s...