نتایج جستجو برای: alosa caspia
تعداد نتایج: 392 فیلتر نتایج به سال:
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...
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...
Toothed whales emit high-powered ultrasonic clicks to echolocate a wide range of prey. It may be hypothesized that some of their prey species have evolved capabilities to detect and respond to such ultrasonic pulses in a way that reduces predation, akin to the situation for many nocturnal insects and echolocating bats. Using high-speed film recordings and controlled exposures, we obtained behav...
—We developed and applied a stable isotope turnover model to estimate how long age-0 American shad Alosa sapidissima reside within tidal freshwater and brackish-water habitats in the York River estuary, Virginia. The residence time was estimated by modeling the changing stable isotope ratio (either the carbon [dC] or sulfur [dS] stable isotope ratio) of an age-0 American shad as it migrates sea...
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