نتایج جستجو برای: نسبت gammarus physa

تعداد نتایج: 159102  

Journal: :Journal of evolutionary biology 2003
J A Rosenfield A Kodric-Brown

Rapid and extensive genetic introgression has occurred between Pecos pupfish (Cyprinodon pecosensis) and sheepshead minnow (Cyprinodon variegatus) in the wild. We studied both female mate choice and male-male competition for mates among C. pecosensis, C. variegatus, and their F1 hybrids to determine what role these behaviours played in the formation of the hybrid swarm. Female C. pecosensis pre...

Journal: :The Journal of experimental biology 1999
Clemens Massabuau Meyrand Simmers

The well known rhythmically active pyloric neural network in intact and freely behaving lobsters Homarus gammarus was monitored prior to and following ecdysis. Despite long-lasting hormonal and metabolic alterations associated with this process, spontaneous pyloric network activity remained largely unaltered until the last 12-48 h before exuviation. At this time, the most notable change was a p...

2000
Steven A. Pothoven Thomas F. Nalepa Stephen B. Brandt

Age-0 yellow perch (Perca flavescens) were collected during October 1998 and age-1 yellow perch were collected during June 1999 from southeastern Lake Michigan off St. Joseph and Muskegon, Michigan, to evaluate diets relative to recent ecosystem changes. Size range of yellow perch examined was 72 to 118 mm. In October at a 15-m site off Muskegon, both Gammarus spp. and Isopoda were found in nea...

Journal: :Parasitology 2007
E R Haine S Motreuil T Rigaud

SUMMARYVertically transmitted parasites may have positive, neutral or negative effects on host fitness, and are also predicted to exhibit sex-specific virulence to increase the proportion or fitness of the transmitting sex. We investigated these predictions in a study on the survival and sex ratio of offspring of the amphipod Gammarus roeseli from females infected by the vertically transmitted ...

2010
Isabel Schmalenbach Heinz-Dieter Franke

A laboratory-based study was performed to assess the impact of climate warming on the recruitment of the endangered population of the European lobster (Homarus gammarus) at Helgoland (North Sea, German Bight). Egg-bearing females collected in situ just after spawning in late summer were subjected to various seasonal temperature regimes. Regimes with elevated temperatures (mild winters) resulted...

Journal: :Bulletin of environmental contamination and toxicology 1979
R D Judy

The purpose of this toxicity test was to determine the reliability and comparability of Cu++ toxicity on Gammarus fasciatus. The study was conducted to compare toxicity results for Rainbow trout, Salmo ~airdneri Richardson, another coldwater poikilotherm. Since G. fasciatus comprises a major portion of the diet of many freshwater fishes, it can be stated to be an "important" species (PATRICK et...

ژورنال: بوم شناسی آبزیان 2016
Efatpanah, Iraj , Falahatkar, Bahram , Razgardani Sharahi, Ali,

This study aimed to determine the effects of replacement fish meal by different levels of gammarus meal on growth performance and body composition of juvenile Siberian sturgeon (Acipenser baerii). We distributed 245 Siberian sturgeon juveniles (initial body weight: 14.24±0.15 g) in five treatments and three replications. The experimental diets were replaced by 10%, 20%, 30%, and 40% gammarus me...

Journal: :avicenna journal of clinical microbiology and infection 0
rouhollah valipour nouroozi parasitology department, medical school, ahvaz jundishapur university of medical sciences, ahvaz, ir iran; parasitology department, medical school, ahvaz jundishapur university of medical sciences, ahvaz, ir iran. tel: +98-6133332036; +98-9165846379, fax: +98-6133332036

results bulinus truncatus was detected in seven locations. in addition, melanoides tuberculata, which is also considered medically important, and physa acuta were detected. the prevalence of bulinus truncatus, melanoides tuberculata, and physa acuta was 6%, 5.5%, and 88.5%, respectively. background bulinus truncatus is the intermediate host of schistosoma haematobium, which is a causative agent...

ژورنال: پژوهش های جانوری 2019

در این مطالعه، مقادیر ترهالوز و گلیسرول دو گونه Gammarus pseudosyriacus و Gammarus bakhteyaricus از منطقه خرسونک و کلیچه در طی فصول مختلف یک دوره یکساله مورد بررسی قرار گرفت. نمونه‌‌ها پس از خشک شدن عصاره گیری و محلول نهایی به دستگاه HPLC تزریق شد. میزان گلیسرول G. pseudosyriacus در فصل بهار، تابستان، پاییز و زمستان به ترتیب برابر با 69/91، 72/3، 29، 28/24 میکروگرم بر میلی‌گرم وزن مرطوب و برای ...

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