摘要:

The swimming activity of five burrowing species has been studied in continuous darkness in actographs using photoconductive cells. In each experiment a clear circadian rhythm of nocturnal frequency appears. This rhythm always remained clear during the experiments (more than 30 days forUrothoe elegansandEurydice inermis).

ISSN:0091-181X    

DOI:10.1080/10236247609386938

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

Feeding patterns of the sea cucumber (Cucumaria frondosa)involve successive insertions of one of its ten tentacles into its mouth. Each tentacle is activated equally often. Adjacent tentacles seldom precede each other and more or less opposite tentacles are successively activated. Neither the direction nor the amplitude of rotation is especially predictable. The probability of a tentacle being activated is related to the number of events in which it has not been activated. Several indices based on previous occurrences are examined for the ability to predict the subsequent tentacle to be used.

ISSN:0091-181X    

DOI:10.1080/10236247609386939

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

Tactile stimulation of open globiferous pedicellariae causes a repeatable further‐opening response (F.O.R.) in which the jaws move from the 90° position to the 180° one. Contact chemical stimulation using starfish tube‐feet or tube‐foot mucus causes closure and venom release. After this the jaws are usually lost as they are of no further use. Removal of these pedicellariae from the test does not abolish their responses which have been analysed to determine effective stimuli, receptor distribution, response quality, latency, speed and duration. The results have been related to the structure and defence potential of these pedicellariae.

ISSN:0091-181X    

DOI:10.1080/10236247609386940

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

1) Filtration rates of a number of bivalves are compared on a basis of the porosity of their gills. There is no obvious difference in the performance of infaunal, siphonate bivalves and epifaunal, non‐siphonate bivalves.

ISSN:0091-181X    

DOI:10.1080/10236247609386941

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

1) During recovery from short‐term exposure to a temperature which produced cold inactivation, facets ofAplysia'sbehavioral repertoire reappear in the following sequence: local reflexes reappear first (4–5°C), general withdrawal reflexes involving responses of unstimulated regions reappear next (7–9°Q, and coordinated whole animal responses such as locomotion are recovered upon further warming (9–11 °Q.

ISSN:0091-181X    

DOI:10.1080/10236247609386942

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

1) Horseshoe crabs,Limulus polyphemus, emerge in mating pairs on sandy beaches to lay eggs then return offshore. Rapid offshore locomotion is exhibited during escape responses. A variety of potentially suitable orientational guideposts exist in the near‐shore environment, including visual cues, bottom slope, wave surge and currents to direct such movements.

ISSN:0091-181X    

DOI:10.1080/10236247609386943

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor