نتایج جستجو برای: alosa braschnikowi
تعداد نتایج: 268 فیلتر نتایج به سال:
Historical aerial applications of the insecticide Matacil 1.8D provide an opportunity to look for potential effects of the endocrine disrupting compound 4-nonylphenol (4-NP) on Atlantic salmon (Salmo salar) populations. Matacil 1.8D contained the carbamate insecticide aminocarb, with 4-NP as primary solvent. Between 1975 and 1985 Matacil 1.8D was applied to forests in Atlantic Canada to control...
Alewife, Alosa pseudoharengus, populations occur in two discrete life-history variants, an anadromous form and a landlocked (freshwater resident) form. Landlocked populations display a consistent pattern of life-history divergence from anadromous populations, including earlier age at maturity, smaller adult body size, and reduced fecundity. In Connecticut (USA), dams constructed on coastal stre...
هدف از این مطالعه تعیین ترکیب گونه ای، پراکنش زمانی و مکانی ماهیان مختلف در سه روش مختلف صید سواحل جنوبی دریای خزر (منطقه گهرباران) طی آذر 1392 تا تیر 1393 می باشد. براساس نتایج به دست آمده در پره ریز چشمه 17 گونه از انواع ماهیان صید شدند که بیش ترین تعداد ماهیان را دو گونه Neogobius caspia و boy...
Cordylophora caspia, a colonial hydrozoan native to the Ponto-Caspian region, has become a common invader of both fresh and brackish water ecosystems of North America and Europe. We describe 11 polymorphic microsatellite loci for this species. Preliminary analyses indicate that population substructure may contribute to departures from Hardy-Weinberg equilibrium. In addition, new loci failed to ...
Diadromous species act as nutrient vectors between their marine and freshwater habitats. Few valuations of this regulating service exist none at the scale distribution ranges. This large-scale approach seems particularly relevant for moving exchanging individuals across borders territories these populations may strongly depend upon each other in terms population viability provision ecosystem se...
The ef®ciency with which estuarine habitats produce ®sh is poorly understood due to the complexity of life cycles. Spatial dynamics of estuarine ®shes comprise retentive and dispersive behaviors which occur on seasonal and ontogenetic scales. Salinity is an important scalar in the spatial dynamics of estuarine ®shes, that may affect production and dispersal. In this paper, we review investigati...
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