摘要:

Abstract.Two geographically distantPosidoniameadows located in the Western Mediterranean Sea were analysed using SCUBA diver‐taken samples. The material was collected at depths of 1, 5, 15 and 30 m, sampling all the plants within a 400cm2area, as well as selecting bundles with epiphyticPoriferafrom a 5 m:area divided into quadrates. The effectiveness of both methods is compared, as the data in the literature were obtained from dredgings.The abundance and distribution of the seventy‐five identified species ofPoriferawere examined, taking into account the depth of the sampling stations and additional environmental factors. The two meadows studied were compared using statistical methods; some doubts are raised about the existence of a specificPoriferapopulation characteristic ofPosidoniab

ISSN:0173-9565    

DOI:10.1111/j.1439-0485.1985.tb00316.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

Abstract.A mixed population of unicellular and colonial cyanobacteria was transferred into culture from a hypersaline helio‐thermal pond in the vicinity of the Dead Sea. The entire complex of strains, incubated in Dead Sea water of varying salinity and temperature, showed a pronounced shift of the maximal growth from a salinity of 72 g l‐1at 30oC up to 142 g 1‐1at 50oC. Over the above range of salinities and temperatures, these cyanobacteria were capable of about four divisions per day, providing that any increase in salinity was coupled with the suitable increase in temperature. The above peculiar adaptation can explain the prominent success of this group of microorganisms in the extreme and unstable ecological conditions of hypersaline habitats. Amounts of slime accumulating in the cultures were proportional to the incubation temper

ISSN:0173-9565    

DOI:10.1111/j.1439-0485.1985.tb00317.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

Abstract.The vertical zonation of the hydroid fauna associated withPosidonia oceanicaleaves in three different localities of the central Mediterranean reveals the presence of two distinct communities. This depth‐related zonation shows patterns that are independent on the geographic are

ISSN:0173-9565    

DOI:10.1111/j.1439-0485.1985.tb00318.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

Abstract.Tricellaria inopinatan. sp., is described from the lagoon of Venice. This is the first record of the genusTricellariafrom the Mediterranean Sea.RésuméDescription ?une espèce nouvelle de Bryozoaire, trouvée dans la lagune de Venise, dans un canal navigable, près du centre de la ville. Elle appartient au genreTricellaria, dont la distribution connue est surtout boréale et indo‐pacifique. Bien que présente dans quatre stations seulement, cette espèce apparait bien installée dans la communauté qui colonise le bio

ISSN:0173-9565    

DOI:10.1111/j.1439-0485.1985.tb00319.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

Abstract.Ibla cumingi (Crustacea, Cirripedia)is a gonochoristic species with dwarf males. The anatomy of both sexes is described and compared with that of otherCirripedia s. str.Systematic implications on the basis of anatomy and biology are given. The degree of dwarfing in the male and the possible cause and way of reduction are discussed.

ISSN:0173-9565    

DOI:10.1111/j.1439-0485.1985.tb00320.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY