توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Effects of insecticide Endosulfan on periphyton community in artificial stream
نویسنده(ها): ،
اطلاعات انتشار: اولین همایش ملی گیاهان دارویی، طب سنتی و کشاورزی ارگانیک، سال
تعداد صفحات: ۱۸
Aquatic ecosystems face variable exposure to pesticides , especially during floodings which are associated with short bursts of high contaminant concentrations that influence biological systems. An experiment was carried out using indoor experimental channels (artificial streams) to assess the long–term effect (20 days) of insecticide on periphyton communities exposed to low levels of Endosulfan (0.25,0.50 and 100 μg Lˉ¹).The effects of endosulfan on community biomass were assessed by measuring dry mass, ash–free dry mass (AFDM), chlorophyll a and autotrophic index (AI) factors. In artificial streams with endosulfan, there was a significant (p <0.05) reduction of chlorophyll a, dry mass and AFDM and increased (AI ), compared to controls with low endosulfan. These observations suggest that biomass of periphyton community could serve as an indicator of endosulfan pollution.<\div>

۲Effects of pesticide Glyphosate ( Roundap® formulation) on periphyton community in artificial stream
نویسنده(ها): ،
اطلاعات انتشار: اولین همایش ملی گیاهان دارویی، طب سنتی و کشاورزی ارگانیک، سال
تعداد صفحات: ۱۷
In recent years, commercial glyphosate herbicide formulations have been widely used in agriculture to control aquatic weeds. These pesticides may result in disruption of ecological balance, causing damage to non–target organisms including fish, diatoms and other aqutice organisms. We assessed the effect of the commercial formulation Roundup® using artificial steram , An experiment was carried out using indoor experimental channels (artificial streams) to assess the long–term effect (20 days) of pesticide on periphyton communities exposed to low levels of Glyphosate (Roundap® formulation),The herbicide was added at four doses: a Control (without Roundup) and three treatments of 20,40 and 60 mg Lˉ¹ of the active ingredient (glyphosate). The effects of Glyphosate on community biomass were assessed by measuring dry mass, ash–free dry mass (AFDM), autotrophic index (AI) and chlorophyll a factors. In artificial streams with Roundup, there was a significant (p <0.05) reduction of chlorophyll a compared to controls. Roundup produced a clear delay in periphyton colonization in treated artificial stream and values of the periphyton mass variables (dry mass, ash–free dry mass (AFDM) and chlorophyll a ) were always higher in control channel Compared channeles with low and medium herbicide concentration.<\div>

۳Algal benthic population and community from stress insecticide– Endosulfan in laboratory streams
نویسنده(ها): ،
اطلاعات انتشار: کنفرانس بین المللی توسعه پایدار، راهکارها و چالش ها با محوریت کشاورزی ، منابع طبیعی، محیط زیست و گردشگری، سال
تعداد صفحات: ۱۱
Human activities have resulted in release of a large of toxic contaminants into aquatic ecosystems.Aquatic ecosystems face variableexposure to pesticides , especially during flooding which are associated with short bursts of high contaminant concentrations that influence biological systems. An experiment was carried out using indoor experimental channels to assess the long–term effect (20 days) of insecticide on algal communities exposed to Three treatments of insecticide endosulfan (0.25,0.50 and 100 µg L¯¹) and a control .The effects of endosulfan on community biomass were assessed by measuring dry mass, ash–free dry mass (AFDM), chlorophyll a and autotrophic index (AI) factors. In laboratory streams with endosulfan, there was a significant (p <0.05) reduction of chlorophyll a, dry mass and AFDM and increased (AI ), compared to controls with low endosulfan. These observations suggest that biomass of algal community could serve as an indicator of endosulfan pollution.<\div>
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