In a replicated field experiment we studied the effects of natural densities of two exotic consumers, the predatory and herbivorous signal crayfish (Pacifastacus leniusculus) and the predatory rainbow trout (Oncorhynchus mykiss), on multiple trophic levels of a pond community. The goals were to: (1) determine the individual and combined effects of predators on macroinvertebrates, macrophytes, a...

Benthic organisms and substrates in the Great Salt Lake, Utah, were sampled during one week in June 2006 to test collection methodologies for biostromes and soft substrates and to get preliminary information on the selenium concentrations of benthic organisms. The sampling was focused on biostromes, as these solid reef-like structures cover 23% of the oxic benthic area of the lake and are the p...

Coupled production between algae and bacteria in stream epilithon was assessed along a nutrient-enrichment gradient in 8 Texas streams with open canopies. Photosynthesis (PS) and bacterial biomass production (BBP) were measured simultaneously using a dual-label radioassay (C-HCO3 – uptake and H-L-leucine incorporation into protein) on multiple samples within a stream reach. PS and BBP were meas...

In summer 2013, phytobenthos and periphyton cyanobacterial samples were collected from Sirch hot springs which are located in 50 Km of southeast of Kerman city (Iran) with coordinates of 30° 09´ 44˝ N and 57° 35´ 50.0˝ E (Fig. 1A). Aphanocapsa rivularis, A. delicatissima are new species for Iran flora. The species of Aphanocapsa genera which have been reported previously from Iran are: Aphanoca...