Traits that increase reproductive success, such as body size and sexual dimorphism, may compromise survival, leading to opposing pressures of natural and sexual selection. Discrete populations exposed to different balances between selective forces should differ in phenotypic traits associated with natural and sexual selection. We used two proximate populations of sockeye salmon (Oncorhynchus ne...

Sedimentary sequences in the Columbia Plateau region of the Pacific Northwest ranging in age from 16-4 Ma contain fallout tuffs whose origins lie in volcanic centers of the Yellowstone hotspot in northwestern Nevada, eastern Oregon and the Snake River Plain in Idaho. Silicic volcanism began in the region contemporaneously with early eruptions of the Columbia River Basalt Group (CRBG), and the a...

this study investigated the effects of sewage discharge on nutrient concentrations and bod5 levels in the coastal waters and sediments ofthe city of mombasa. the results indicated that nutrient concentrations in tudor, mtwapa and makupa creeks were elevated as compared to concentrations in gazi creek (mean ranges of 0.022-0.039mg/l, 0.038-0.163mg/l and 0.034-0.118mg/lphosphates, nitrates and a...

Samples of Zooplankton of Bardestan Creek and its offshore waters were collected using a 100 cm long (30 cm diam.) mesh net of a 110 µm pore size in March (winter) and August, 2014 (summer) on a fishing boat; preserved in 5% formalin, identified and population abundances per cubic meter counted. Eighteen stations (9 stations each in the creek and offshore waters) were sampled. |Mean zoopl...

We investigated the effectiveness of Escherichia coli community fingerprinting for identifying fecal pollution sources impacting a recreational beach. E. coli in water collected from the beach, nearby creek and storm sewer outfall were enumerated using membrane filtration, while E. coli communities were characterized following polymerase chain reaction analysis and denaturing gradient gel elect...

in this study, macrobenthic bivalves were identified at 12 stations located in four regions (markazi, shahr no, khalasi, and gabrik creeks). the relationships between density of bivalves and non-biological factors were examined, as well. sampling of sediments was done seasonally from autumn 2009 to summer 2010, by 0.04 m2 van veen grab, in three stations including mouth, middle and end of each ...

Twenty-eight tidal creeks were sampled along the South Carolina coast in the summer of 1995 to determine the levels of sediment trace metal contamination associated with different types and varying levels of human development in their watersheds. The particle size and total organic carbon (TOC) content of creek sediments in developed watersheds (i.e., industrial, urban, and suburban) were simil...