—During November 2002, 51 shovelnose sturgeon Scaphirhynchus platorynchus were sexed by ultrasound imaging using a portable ultrasonograph. We identified males with 96% accuracy (N 5 25) and females with 80% accuracy (N 5 25); one hermaphroditic individual was misidentified as a male. Overall, ultrasound imaging was 86% accurate. Sex in postspawned females was difficult to determine, 60% being ...

A.D. Mus, State Institute for Coast and Sea, The Hague, The Netherlands, (email:[email protected]) P.H.A.J.M. van Gelder, Faculty of Civil Engineering and Geosciences, Delft University of Technology, The Netherlands (e-mail: [email protected]) A.O. Selivanov, Faculty of Geography, Moscow State University, Russia, ([email protected]) E.P.L. Elias, Faculty of Civil Engineering...

introduction: under the principles of international law, no state has the right to use or permit the use of its territory in such a manner as to cause damage to the environment of other states. spatial econometrics provides a powerful tool to assess the influence of the pollution of neighboring countries on a country's pollution level. spatial spillover effects play a significant role in a...

Modern satellite gravity missions and ground gravimetry provide operational data models that can be used in various studies geology, tectonics, climatology, etc. In the present study, sedimentary basins southern part of East European Platform adjoining areas including Caucasus are studied by employing approach based on decompensative anomalies. The new model sediments, implying their thickness ...

introduction a considerable percentage of the world’s population is living in the coastal areas. thus, there are many different kinds of problems in these regions. because of the large amount of the people in these areas, their ecosystems are confronted with huge and serious problems. there are different types of arrangements for preventing destruction of ecosystems around the seas. unified man...

Considering the increasing rice consumption in the world and also the excessive application of pesticides to increase production, an experiment was conducted to determine the pesticide residues and their effects on nitrogen, potassium and phosphorus content of Hashemi, Khazar and Gohar (SA13) rice cultivars, in a factorial design at randomized complete block design with three replications. In t...

Phytoplanktons are the first bio- indicators of pollution in aquatic ecosystems. Phytoplankton assemblage and aquatic ecosystems are always influenced by environmental factors therefore these environmental changes and threats must be understood in any ecosystem. Phytoplankton are inexpensive and readily available bio- indicators. In the present study, phytoplankton were used to study the Sefid ...