scholarly journals Enhancement of the Response of Rock Crabs, Cancer irroratus, to Prey Odors following Feeding Experience

1999 ◽  
Vol 197 (3) ◽  
pp. 361-367 ◽  
Author(s):  
A. Ristvey ◽  
S. Rebach
Keyword(s):  
Cancer Irroratus ◽  
Feeding Experience ◽  
Prey Odors

Feeding by Hatchery-Reared and Wild Atlantic Salmon (Salmo salar) Parr in Streams

1979 ◽  
Vol 36 (11) ◽  
pp. 1408-1412 ◽  
Author(s):  
A. J. Sosiak ◽  
R. G. Randall ◽  
J. A. McKenzie
Keyword(s):  
Atlantic Salmon ◽  
Key Words ◽  
Salmo Salar ◽  
Food Selection ◽  
Stomach Contents ◽  
Stomach Fullness ◽  
Size Dependent ◽  
Atlantic Salmon Salmo Salar ◽  
Feeding Experience ◽  
Salmon Parr

Hatchery-reared Atlantic salmon (Salmo salar) parr were captured 1–3 mo after release in streams, along with wild parr from the same streams. Identification of their stomach contents showed total number of organisms and number of taxa per stomach were greater and there was a higher index of stomach fullness in wild than in hatchery parr resident ≤ 2 mo in a stream. Wild parr consumed more Brachycentridae, Hydroptilidae, Diptera, and Plecoptera than did hatchery parr, but sometimes less Odontoceridae and Heptageniidae. These differences may have arisen from size-dependent food selection, the effects of feeding experience, or possible microhabitat differences between wild and hatchery parr. Key words: salmon parr, hatchery-reared, wild, feeding

The effect of early feeding experience on signal-directed response topography in the rat

1984 ◽  
Vol 32 (1) ◽  
pp. 11-15 ◽  
Author(s):  
Graham C.L. Davey ◽  
Gary G. Cleland ◽  
David A. Oakley ◽  
Janet L. Jacobs
Keyword(s):  
Response Topography ◽  
Early Feeding ◽  
Feeding Experience

Mating Behavior of the Rock Crab, Cancer irroratus

1978 ◽  
Vol 35 (10) ◽  
pp. 1385-1388 ◽  
Author(s):  
R. W. Elner ◽  
A. B. Stasko
Keyword(s):  
Key Words ◽  
Mating Behavior ◽  
Cancer Irroratus ◽  
Rock Crab ◽  
Laboratory Tank

A pair of rock crabs, Cancer irroratus, in mating embrace an hour after being placed in a laboratory tank, was observed intermittently until ecdysis of the female and copulation of the pair, and then until escape of the female 27 d after ecdysis. When separated from the mating embrace, the hard-shelled female sought out the male. Approach of female ecdysis was indicated by protrusion of a soft spherical bulge at the rear of the epimeral line. Details of the immediate pre- and postcopulatory behavior were observed continuously from 26 min before to 150 min after copulation. The female was first noted separated from the male 7 h after copulation. Periods of separation increased until mating interactions were completely abandoned 5 d after copulation. A second pair subsequently observed confirmed the above. Mating embrace was also observed between a hard-shelled male and a hard-shelled female that already had sperm plugs. Key words: Crustacea, crabs, copulation, molt indicators

The Pharmacological Profile of the Acetylcholine Response of a Crustacean Muscle

1980 ◽  
Vol 88 (1) ◽  
pp. 147-160
Author(s):  
EVE MARDER ◽  
DANIÈLE PAUPARDIN-TRITSCH
Keyword(s):  
Acetylcholinesterase Activity ◽  
Gastric Mill ◽  
Muscarinic Agonists ◽  
Pharmacological Profile ◽  
Cancer Borealis ◽  
Cancer Irroratus ◽  
Pharmacological Analysis ◽  
Crustacean Muscle ◽  
Cancer Pagurus ◽  
High Concentrations

A pharmacological analysis was made of the depolarizing acetylcholine (ACh) response found on the gastric mill 1 muscles of the crabs Cancer pagurus, Cancer irroratus and Cancer borealis. Acetylcholine, carbamylcholine, trimethylammonium, nicotine, and dimethyl-4-phenyl-piperazinium were effective in producing contractures and depolarizations in these muscles. No response to decamethonium, suberyldicholine, acetyl-β-methylcholine, carbamyl-β-methylcholine, pilocarpine and oxotremorine could be detected. High concentrations of muscarinic agonists (10−4 to 10−3 M) potentiated and prolonged the ACh iontophoretic response. When the acetylcholinesterase activity was inhibited with neostigmine, or when the response was elicited with carbamylcholine, muscarinic agonists partially inhibited the response. ACh responses were most effectively blocked by vertebrate nicotinic ganglionic antagonists, including dihydro-β-erythroidine, pempidine, and mecamylamine. α-Bungarotoxin was without effect on the ACh response.

Sign in / Sign up

Export Citation Format

Share Document