we studied the role of nutrients on various aspects of the periphyton community in artificialstreams. dry mass, ash-free dry mass, chlorophyll a and biovolume of the periphyton community weremeasured under 3 different nutrient regimes, including one from natural streams as a control and twowhich were enriched with n and n+p. results of this experiment indicate that the standing crop of theperip...

The influence of the herbivorous snail (Physa sp.) on the algal periphyton community from the Gamasiyab River, Kermanshah province in western Iran was examined by establishing a gradient of Physa sp. density in artificial streams. The impact of Physa grazing was evaluated by measuring dry mass, ash-free dry mass (AFDM) and chlorophyll a in the periphyton community. Snails significantly depresse...

or as the ends of a boiv are drawn together." They have a legend that it visits the country every thirty years. The epidemic arrived in Bhamo in June last, having travelled up the Irrawaddy Yalley starting in Rangoon in May and visiting Mandalay during the early part of June. It is interesting to note this following of the important trade route. It is not unlikely that the epidemic originated f...

DING WANG,∗†† XIANFENG ZHANG,∗ KEXIONG WANG,∗ ZHUO WEI,∗ BERND WÜRSIG,† GILLIAN T. BRAULIK,‡ AND SUSIE ELLIS§ ∗Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China †Texas A&M University, 4700 Avenue U, Building 303, Galveston, TX 77551, U.S.A. ‡Downstream Research Group, 3950 S. Fletcher Avenue, Amelia Island, FL 32034, U.S.A. §Conservation International, 1919 M Street, S...

In Australia, Ross River virus (RRV) is predominantly identified and managed through passive health surveillance. Here, the proactive use of environmental datasets to improve community-scale public health interventions in southeastern Tasmania is explored. Known environmental drivers (temperature, rainfall, tide) of the RRV vector Aedes camptorhynchus are analysed against cumulative case record...

I. INTRODUCTION We humans tend to worry first about our own happiness, then about our families, then about our communities. In times of great stress, such as war or natural disaster, we may focus temporarily on our country but we rarely think about Earth as a whole or the human species as a whole. This narrow perspective, perhaps best exemplified by the American consumer, has led to the environ...

The female and male of Dasybasis (Agelanius) cortesi, new species, is described and illustrated from specimens collected in the National Reserve of Río Clarillo, Cordillera Province, Central Chile. Its relationships to other Dasybasis species are discussed.

Abstract Today, groundwater is the essential resource whole water sector demands. The spring baseflow discharge analysis can significantly help us better manage resources. This study was focused on separation of Gamasiyab karstic (western Iran) using wavelet transform (WT). recursive digital filter (RDF) method with different algorithms has been used to compare approach performance. Forty-nine ...