REPRODUCTIVE AND MOLTING CYCLES IN CAVE CRAYFISH
نویسندگان
چکیده
منابع مشابه
Spatial Familiarity in the Blind Cave Crayfish, Orconectes Australis Packardi
This study examined behaviour of cave-adapted blind cray sh to novel territories of various sizes. Cave cray sh, Orconectes australis packardi, were kept within a dark room in individual aquaria for 7 days. They were then placed into a small tank (33 £ 28 £ 23 cm, 10-15 cm water depth), and a large tank (54 £ 37 £ 30 cm, 10-15 cm water depth). Time, distance of movements, and length of pauses...
متن کاملGrowth, Molting and Survival Response of Juvenile Narrow Clawed Crayfish, Astacus leptodactylus, Fed Two Sources of Dietary Oils
The influence of five pure diets of isonitrogenous and isoenergic with different ratios of Clupeidae fish oil (F) and soybean oil (S) on growth, molting and survival of narrow-clawed crayfish, Astacus leptodactylus, was evaluated during an 8-weeks trial. As soybean oil replaced with fish oil in each treatment, gently. Test diets were inclusive F0/S100, F30/S70, F50/S50, F70/S30 and F100/S0 fis...
متن کاملDepression of synaptic efficacy at intermolt in crayfish neuromuscular junctions by 20-hydroxyecdysone, a molting hormone.
This report demonstrates that ecdysteroids can reduce synaptic transmission at an intermolt stage of a crustacean tonic neuromuscular junction by acting at a presynaptic site. The steroid molting hormone, 20-hydroxyecdysone (20-HE), appears to act through a rapid, nongenomic mechanism that decreases the probability of synaptic vesicle release and reduces the number of release sites. Quantal ana...
متن کاملGrowth, Molting and Survival Response of Juvenile Narrow Clawed Crayfish, Astacus leptodactylus, Fed Two Sources of Dietary Oils
The influence of five pure diets of isonitrogenous and isoenergic with different ratios of Clupeidae fish oil (F) and soybean oil (S) on growth, molting and survival of narrow-clawed crayfish, Astacus leptodactylus, was evaluated during an 8-weeks trial. As soybean oil replaced with fish oil in each treatment, gently. Test diets were inclusive F0/S100, F30/S70, F50/S50, F70/S30 and F100/S0 fis...
متن کاملPower analysis of tests for loss of selective constraint in cave crayfish and nonphotosynthetic plant lineages.
Loss of selective constraint on a gene may be expected following changes in the environment or life history that render its function unnecessary. The long-term persistence of protein-coding genes after the loss of known functional necessity can occur by chance or because of selective maintenance of an unknown gene function. The selective maintenance of an alternative gene function is not demons...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Biological Bulletin
سال: 1966
ISSN: 0006-3185,1939-8697
DOI: 10.2307/1539741