摘要:

Abstract.The production rates of intertidal algae at seven study sites in the Saklanha Bay area. South Africa, were measured monthly for 15 months. Algae grew rapidly and formed extensive, permanent mats on shores that were enriched with nutrients from the dissolved guano of seabirds. The most significant correlate of limpet(Patella granulans)growth was the rate of algal production; more rapid limpet growth on nutrient‐rich shores, combined with the effects of predation by African Black OystercatchersHaematopus moquinion limpets, led to differences in the size structures and life‐history patterns of populations of limpets on enriched and unenricheci shores. The rate of primary production affected relationships between intertidal organisms at all trophic levels and influenced patterns of organization within the commun

ISSN:0173-9565    

DOI:10.1111/j.1439-0485.1988.tb00327.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

Abstract.The composition and distribution of the amphipod fauna in the area of Evros Delta (North Aegean Sea) have been investigated by means of quantitative sampling. On the basis of similarity in distribution among stations, 3 groups of species have been distinguished. The dependence of the distribution of these 3 groups, as well as of each species separately, on certain environmental factors is discussed.

ISSN:0173-9565    

DOI:10.1111/j.1439-0485.1988.tb00328.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

Abstract.Combined effects of temperature, salinity, and metal enrichment (Zn, Mn, Co) on the growth rate and chemical composition ofFucus vesiculosusL. were studied in culture. Factorial combinations of two temperatures and three salinities were used. The results indicated that the accumulation of Zn and Mn into algal tissue was enhanced by dilution of the media, whereas Co accumulation exhibited maxima at the medium salinity. Zn accumulation was enhanced by temperature, while the opposite was true for Mn and Co.In the presence of metals the usual dilution‐induced changes in growth activity and chemical composition ofFucusplants were altered, while responses to the temperature factor remained unchanged. In diluted media, growth activity and mannitol content decreased along with a simultaneous increase of protein content. In the presence of Zn and Mn the mannitol content exhibited peaks at the medium salinity; in the presence of Co the dilution‐induced pattern remained unchanged. Salinity‐induced changes in growth and protein content were altered in the presence of metals. Maxima in growth rates were found at the medium salinity. Growth was higher in extremely diluted media than in scawater, indicating an inversion of responses to the salinity factor. Both the growth rate and mannitol content were lowest under the influence

ISSN:0173-9565    

DOI:10.1111/j.1439-0485.1988.tb00329.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

Abstract.Routine monthly samples of the commercially important portunid crabLiocarcimtx puberand the sympatric but ecologically separatedL. holsatuswere collected from the waters and shores around the Gowcr Peninsula, South Wales, between November 1983 and September 1985.The pubertal moult inL. puberoccurred at 38 mm CW (carapace width) (females) and 42 mm CW (males). InL. holsatusthis occurred at 17 mm (females) and 18.5 mm CW (males). The median size of ovigcrous females was 49.2 ± 6.7 mm CW inL. puberand 26.5 ± 2.0 mm CW inL. holsatus.Moulting and copulation occurred between spring and autumn, the moulting period of males being earlier than that of the females. OvigcrousL. holsatuswere recorded throughout the year, with highest proportions between February and April.L. puberwere ovigcrous mainly between January and March; none was recorded between September and November. The number of eggs of the wild brood (range: 39,000–280,000 forL. holsatusand 40.000–262.000 forL. puber) was related to female body size as y = 3.099.51 c0.1126x, r = 0.90, n = 21 and y = 6,335.98 c0.051x, r = 0.88, n = 23, respectively, where y = number of eggs and x = carapace width (mm).Following successful copulation, females of both species were able to spawn more than once during an intcrmoult p

ISSN:0173-9565    

DOI:10.1111/j.1439-0485.1988.tb00330.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

Abstract.A large‐scale map of thePosidonia oceanicaseagrass beds as well as other benthic substrata and communities was compiled for a cove of a marine reserve free from pollution and man‐made disturbance. An extensive diving survey of the cove and the interpretation of aerial colour photographs were used. The greater part of the cove is occupied by theP. oceanicameadow. Patches of dead “matte” were observed at a depth of between 7 and 14 m. They may be the result of a natural hydrodynamic equilibrium between building and

ISSN:0173-9565    

DOI:10.1111/j.1439-0485.1988.tb00331.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

Abstract.The utilization of empty holes of endolithic bivalves(Gttsirocluwnu dubuibyBknnius chdmcitinus, andLitliophaga lithophagaby all other species) as shelters by egg‐guarding males of nine species of AdriaticBlenniidaeis compared. A wide spectrum of entrance sizes to these “standardized” shelters is used with the most frequent utilization ranging between 1(H) and 275 mm:(11.2–18.8mm mean entrance diameters). As a trend within and between species, larger fish utilize holes with disproportionately wider entrances. There arc significant differences between species in the means of “fit” of the heads within the entrances: the heads ofB. dulmaibuts, B. canaeve, B. adrialicus, andB. zvonimiri“fit” tightly into their entrances whereas the two large species,B.puvoandB. tentacularis, which only facultatively use holes of boring mussels for breeding, arc found in holes with “oversized” entrances. In most species mean shelter depth approximates mean body length. Species which tightly “fit” their entrances tend to stay longer when disturbed mechanically or chemically compared to those with only a loose “fit”. The ecological and evolutionary significance of

ISSN:0173-9565    

DOI:10.1111/j.1439-0485.1988.tb00332.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

Book reviewed in this article:Southward, A.J. (Ed.):Barnacle Biology. Crustacean Issues 5 (FREDERICK R. SCHRAM, general editor). A. A. BalkemaLassi‐krc,P. J.‐M. Martin(Eds.):Biogeochemical processes at the land‐sea boundary. Elsevier Oceanography

ISSN:0173-9565    

DOI:10.1111/j.1439-0485.1988.tb00333.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

ISSN:0173-9565    

DOI:10.1111/j.1439-0485.1988.tb00334.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY