摘要:

Abstract.The contribution of prolactin, melatonin and the prolactin releasing pharmacon, meto‐clopramide (Paspertin®), to the motivation of cleaning behaviour is analysed in the wrasse Labroides dimidiatus. The existence of a special cleaning motivation partly independent from hunger is stress

ISSN:0173-9565    

DOI:10.1111/j.1439-0485.1982.tb00280.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

摘要:

Abstract.Ecology and morphology of Alcyonium (Parerythropodium) coralloides were studied in different sites of the Eastern Atlantic and the Mediterranean. The species is extremely variable in size, colony shape and colour. In the Mediterranean population, encrusting red colonies are mostly encountered, although lobate colonies also exist. White and pink colonies are considered mutants, which tolerate the stable environment of deeper habitats better than the conditions encountered in shallow biotopes. Mediterranean colonies are dioecious and reproduce sexually. In the Eastern Atlantic, lobate pink colonies are the most common form, and show little variability. These (at least partly) parthenogenic populations are considered offspring from stray larvae from more southern regions. This explains the rather patchy distribution of the Atlantic populations, as compared to the widespread distribution throughout the entire Western Basin of the Mediterranean and the Adriatic Sea. A study of the most important systematic characters of the species (growth form, sclerites and solenial network) leads to the conclusion that coralloides belongs to the genus Alcyonium. As a result, coralloides being its type‐species, the genus Parerythropodium will have to be suppresse

ISSN:0173-9565    

DOI:10.1111/j.1439-0485.1982.tb00281.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

摘要:

Abstract.Two mouthless interstitial animals, a nematode and a turbellarian were collected from reduced sediments surrounding polychaete tubes. The microorganisms in the gut rudiment of the two animals were described using TEM. The occurrence of mouthless freeliving marine animals in relation to organic and sulfide rich environments and their association with microorganisms is discussed. A description ofAstomonema jennerin.gen., n. sp. (Nematoda, Siphonolaimidae) is given in an appendix.

ISSN:0173-9565    

DOI:10.1111/j.1439-0485.1982.tb00282.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

摘要:

Abstract.The population ofLaminaria ochroleucain the current swept Straits of Messina was investigated regarding its age structure and photosynthesis. Age structure appears to be determined by sporadic recruitment and the limitation of growth due to peak currents decapitating older plants, which is corroborated by drag force resistance calculations. The calculation of a carbon budget from measurements of photosynthesis and dark respiration both in the laboratory andin situshows thatL. ochroleucacannot satisfy its carbon demands for growth and respiration at 50 m depth and no satisfactory explanation can be given for its rapid growth between 50 and 100 m.

ISSN:0173-9565    

DOI:10.1111/j.1439-0485.1982.tb00283.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

摘要:

Abstract.The relative palatability of 13 algae common in the kelp beds of the west coast of the Cape Peninsula, South Africa, is experimentally investigated with respect to feeding by the sea urchinParechinus angulosus.We investigated 2 hypotheses: 1) that this important herbivore would feed selectively on these algae and 2) thatDesmarestia firma,one of these algae, would be unattractive toParechinuson account of the H2S04in the thallus.Algal preferences are determined from 3 types of feeding experiment, results of which support our first hypothesis, and allow us to group the algae into 3 arbitrary categories: “preferred”, “intermediate”, and “non‐preferred”. To explain these patterns, we measured “relative astringen‐cy” of each species (essentially a phenol measurement), and phenol content of 4 species (FOUN‐DENIS method). Rates of feeding on single species are negatively correlated with relative astringen‐cies (r = 0.76, P = 0.99). The high relative astringency ofD. firmais caused by its high (18 % per dry mass) H2S04content, and it is non‐preferred. Our results therefore support our second hypothesis. Other implications of th

ISSN:0173-9565    

DOI:10.1111/j.1439-0485.1982.tb00284.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY