the genetic variation and population structure of narrow-clawed crayfish (astacus leptodactylus) was examined by means of polymerase chain reaction (pcr) restriction fragment length polymorphism (rflp) analysis of the cytochrome oxidase subunit i (coi) of mitochondrial dna. a total of 194 adult specimens were collected from seven sample sites including, two in the south caspian sea and one each...

The genetic variation and population structure of narrow-clawed crayfish (Astacus leptodactylus) was examined by means of polymerase chain reaction (PCR) restriction fragment length polymorphism (RFLP) analysis of the cytochrome oxidase subunit I (COI) of mitochondrial DNA. A total of 194 adult specimens were collected from seven sample sites including, two in the south Caspian Sea and one each...

Nutrient inputs from rivers play an important role in lake eutrophication. To compare the forms characteristics of phosphorus (P) and nitrogen (N) in rivers flowing through rural and urban areas, water samples were collected seasonally from five urban rivers and six rural rivers flowing to Lake Chaohu, China. Higher total phosphorus (TP), particulate phosphorus (PP), soluble reactive phosphorus...

The genetic variation and population structure of narrow-clawed crayfish (Astacus leptodactylus) was examined by means of polymerase chain reaction (PC R) restriction fragment length polymorphism (RF LP) analysis of the cytochrome oxidase subunit I (COI) of mitochondrial DNA. A total of 194 adult specimens were collected from seven sample sites including, two in the south Caspian Sea and one ea...

Tributary rivers can contribute significantly to alluvial-plain construction by supplying large volumes of clastic material. Their relation the main axial river strongly influences sediment deposition and preservation. The Po Plain is fed River a dense network transverse tributaries draining nearby Alpine Apennine chains. Stratigraphic, sedimentological, petrographic geochemical analyses on 38 ...

The Himalayan rivers yield the most significant flux of continental sediments into ocean. Organic matter (OM) transported by these provides a peek at influence diverse geological terrains, soil types, vegetation, and climate on carbon cycling within narrow boundary. We analyzed suspended bedload from four to trace their sources, elucidate fate during fluvial transport, estimate organic (OC) flu...

Driftwood belongs to natural rivers just like water and sediment do. A sound ecosystem requires driftwood, although it might jam at civil structures, altering the flow section rise backwater. Safety considerations suggest removing wood from rivers, whereas ecological experience asks for its presence. The situation become critical if spillways clog during floods, so that their discharge capacity...

Large estuaries are especially vulnerable to coastal flooding due to the potential of combined storm surges and riverine flows. Numerical models can support flood prevention and planning for coastal communities. However, while recent advancements in the development of numerical models for storm surge prediction have led to robust and accurate models; an increasing number of parameters and physi...