摘要:

Abstract.Benthic metabolism and standing stocks were investigated in the deep Red Sea between 21oand 27oN, Activity was assessed by the determination of respiration rates with a shipboard method and by calculating oxygen consumption from the activity in the electron transport system. We attempted to compare results from different latitudes within the warm Red Sea and with data from cold Atlantic environments. Our investigations were part of an environmental risk assessment to evaluate future mining of metalliferous sediments from the Atlantis II Deep.

ISSN:0173-9565    

DOI:10.1111/j.1439-0485.1987.tb00171.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

Abstract.Biomass and primary production rates derived from photosynthesis‐light curves on picoplankton (1 μm fraction in the southern stations were of higher magnitude (8.5–12.0 mg C mg Chi a‐1h‐1) than in the northern station, possibly due to the impact of upwelled water flowing southward

ISSN:0173-9565    

DOI:10.1111/j.1439-0485.1987.tb00172.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

Abstract.Along the vertical cliff of Romito (Leghorn, Italy) 97 polychaete species were found from 0 to 6 m depth. Three depth related communities could be identified by trends in structural parameters (abundance, number of species, and diversity), by changes in species composition, and by the distribution of ecological and trophic groups. Such a zonation is consistent with the principal models proposed for the Méditerranean and seems mainly related to algal conditioning of the substrate

ISSN:0173-9565    

DOI:10.1111/j.1439-0485.1987.tb00173.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

Abstract.The occurrence of pianktonic stages of the scyphomedusaAurelia auritaLAM. in monthly samples, from May 1983 to July 1985, was studied in Elefsis Bay (Saronikos Gulf, Greece). Results showed that the medusae biomass had its maximum value during summer, followed by a sharp drop during fall and winter. The major peak for the ephyrae liberation was during January‐February, when zooplankton biomass reached its maximum. The vertical distribution ofA. auritain relation to light intensity is discusse

ISSN:0173-9565    

DOI:10.1111/j.1439-0485.1987.tb00174.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

Abstract.The abundance and taxonomic diversity of phytoplankton have been studied in relation to certain environmental factors in the South Euboikos Gulf, a restricted tidal embayment on the eastern coast of Greece. The northern part of the gulf with higher tidal current, influenced by sewage and industrial effluents, showed high concentrations of nutrients, a greater total density of phytoplankton, relatively high chlorophyllacontent, and a lower taxonomic diversity when compared with the southern part. The phytoplankton cycle was largely due to changes in diatom concentration. A slight variation in the occurrence of species and dominance could be observed along the salinity gradients.

ISSN:0173-9565    

DOI:10.1111/j.1439-0485.1987.tb00175.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

Abstract.This study of the enteropneust,Balanoglossus aurantiacus, in Bogue Sound, NC, provides information on the general structure and variability in geometry of its burrow,B. aurantiacusemploys a funnel at the anterior end of its burrow to cave in surface sediments. It ingests, processes, then deposits these sediments back on the surface as fecal castings. Measurements made on resin casts of burrows and on photographs of surface features (burrow openings and funnels) revealed a new and consistent pattern of burrow construction. This pattern distinguishesB. aurantiacusburrows from those reported for other funnel feeders and enteropneusts (except, perhaps, forB. clavigerus).Laboratory and field observations revealed that, within its burrow,B. aurantiacusis elongated, can double‐back on itself, and can use anterior burrow openings for subsequent fecal castings. Tests for significant changes in location of surface features gave estimates of how frequently individuals in aquaria and field populations abandon old burrow locations and construct new burrows. Field observations showed thatB. aurantiacuswill reopen a blocked burrow openin

ISSN:0173-9565    

DOI:10.1111/j.1439-0485.1987.tb00176.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY