ISSN:0035-919X    

DOI:10.1080/00359198609520102

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

This paper explores some of the possible applications of High Performance Liquid Chromatography (HPLC) in the field of marine organic chemistry. It is suggested that the use of reverse phase (C18, C8) columns be developed further since these do not require a disruptive desalting step and this makes them particularly suited for sea-water research. The versatility of this technique is emphasized in that components can be separated and identified using columns and detectors specific to some physico-chemical characteristics.

ISSN:0035-919X    

DOI:10.1080/00359198609520103

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

This study investigates the effect of a large artificial reef on nearby sediment distribution and associated meiofauna. Turbulence caused by prevailing swells resulted in resuspension and further size sorting of the sediment in the vicinity. The sand became slightly, but significantly, finer on the port flank, in the lee of the wave trains, compared to starboard undisturbed terrain, which we used as control. No significant difference in biogenic carbonate content could be detected with respect to the two sides, while sediment detritus was enhanced on port.

ISSN:0035-919X    

DOI:10.1080/00359198609520104

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

A four-month study of the effects of submerged aquatic plant harvesting on invertebrate communities associated withPotamogeton pectinatusL. at Marina Da Gama, Zandvlei, is described. Fifteen taxa were recorded. Five taxa formed 78,8-99,4% of the invertebrate biomass at all three sites:Ficopomatus enigmaticus(Fauvel) > Chironomidae larvae >Ischnura senegalensis(Rambur) >Tomichia ventricosa(Rve) > Ostracoda. Total invertebrate standing stocks were higher at an unharvested site (4,63-12,65 g dry mass m−2) than at a ‘controlled-height’ harvested site (1,36-4,43 g dry mass m−2) and a regularly harvested site (1,94-7,06 g dry mass m−2). Since both investigated harvesting procedures were deleterious to benthic standing stocks, it was concluded that any harvesting programme must include the conservation of undisturbed areas.

ISSN:0035-919X    

DOI:10.1080/00359198609520105

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The distribution of marine species on a rocky shore at Umdoni Park was analysed objectively by a computer technique using Normal Association Analysis (NAA) and Principal Components Analysis (PCA). Five communities were defined and the major gradient along the two principal components axes was correlated with that sector of the shore which received wave surge every day irrespective of the state of the tide.

ISSN:0035-919X    

DOI:10.1080/00359198609520106

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The present taxonomic status of the genusHaliotisin South Africa is discussed. Problems of classification are described and distribution maps, maximum sizes and morphological features presented.

ISSN:0035-919X    

DOI:10.1080/00359198609520107

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The shrimpPalaemon pacificuswas sampled inZostera capensisbeds in three eastern Cape estuaries (Sundays, Swartkops and Kromme). In all three estuaries shrimp numbers and biomass in theZosteragenerally exhibited seasonal fluctuations, with summer/autumn peaks from November to March (density 200–400 m−2; dry mass 3–6 g m−2) declining to winter/spring minima from June to September (20–100 m−2; 0,3-1,5 g m−2). The Kromme had the highest mean annual shrimp biomass (dry mass 2,86-3,10 g m−2), followed by the Sundays (2,69 g m−2) and the Swartkops (2,11-2,22 g m−2). Shrimp size-frequency distributions displayed a pattern of bimodality in summer/autumn from November to March, becoming polymodal during the year. A temporal variation of sex ratio was evident with overall M:F ratios of 1:2,27 in the Sundays and 1:1,96 and 1:1,82 at two Swartkops stations. A mean of 4 cohorts per annum was resolved for the Sundays and 3,1 for the Swartkops, with mean residence times in theZosteraof 11,9 months and 10 months respectively. Mean summer growth (0,104 mm d−1) was double that of winter (0,055 mm d−1). A highly significant association was found between shrimp andZosteraboth spatially and temporally. At low tide significant correlations were found between shrimp mass and water depth in theZostera.The mean annual somatic production ofP. pacificuswas highest in the Sundays (15,30 g m−2) followed by the Swartkops (12,42 g m−2). The production/biomass ratios were similar, varying from 5,62 to 5,83 in the Swartkops to 5,69 in the Sundays.

ISSN:0035-919X    

DOI:10.1080/00359198609520108

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

ISSN:0035-919X    

DOI:10.1080/00359198609520109

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor