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The concept of size spectra, developed by S heldon & P arsons 1967 and S heldon et al. 1972, seeks to describe community structure by evoking the distribution of biomass over a sequence of equal intervals of the logarithm of body size. In this study, biomass size spectra were prepared for benthic macro- and meiobenthos communities at 5 stations, differing in their sediment characteristics, located in the shallow, coastal area of the Gulf of Gdańsk Southern Baltic Sea. The purpose of this study was to determine whether the community spectra would allow distinct separation of ecological categories of the benthos and whether habitat differences between stations would significantly affect benthic size spectra.
Benthic biomass at the stations sampled depended mainly on nematodes and oligochaetes among the meiobenthos and on hydrobiid snails and M. edulis among the macrobenthos. Regardless of habitat, size spectra peaked initially at the meiofaunal range weight class 25 1. 19–501.19 ng C, identical to that reported in other studies. The separation between meio- and macrobenthic peaks, however, was not as pronounced as that found in other studies. Normalized size spectra demonstrated that most of the variations in the spectra between stations was introduced by macrobenthos, which differed between the coarse- and fine-grained sediments. Nonetheless, those differences were not strong enough to significantly affect the spectra. In consequence, the benthic biomass spectra of all the stations were found to conform to a common pattern and could be represented by a single, average spectrum. 相似文献
Benthic biomass at the stations sampled depended mainly on nematodes and oligochaetes among the meiobenthos and on hydrobiid snails and M. edulis among the macrobenthos. Regardless of habitat, size spectra peaked initially at the meiofaunal range weight class 25 1. 19–501.19 ng C, identical to that reported in other studies. The separation between meio- and macrobenthic peaks, however, was not as pronounced as that found in other studies. Normalized size spectra demonstrated that most of the variations in the spectra between stations was introduced by macrobenthos, which differed between the coarse- and fine-grained sediments. Nonetheless, those differences were not strong enough to significantly affect the spectra. In consequence, the benthic biomass spectra of all the stations were found to conform to a common pattern and could be represented by a single, average spectrum. 相似文献
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P. Szefer G. P. Glasby J. Geldon R. M. Renner E. Björn J. Snell W. Frech J. Warzocha 《Environmental Geology》2009,57(4):847-862
Analysis of 59 surface sediment samples from the Polish exclusive economic zone (EEZ) shows that Szczecin Lagoon sediments
are the most polluted by heavy metals and that the degree of heavy-metal pollution decreases substantially on passing from
the Szczecin Lagoon to the Pomeranian Bay and the inner shelf area and then on passing to the Bornholm Deep and Słupsk Furrow.
Heavy-metal pollution in the sediments of the western part of the Polish EEZ therefore appears to follow the dispersion of
the Oder River. Fluffy material from the Oder estuary appears to be the main source of heavy metals in the muddy sediments
of the Bornholm Deep. The formation of sulphides is therefore not the principal factor controlling the enrichment of heavy
metals in the sediments of this anoxic basin, although it may be responsible for the uptake of Mo, Sb and As. Two main factors
control the distribution of the rare earth elements (REE) in sediments of the Polish EEZ: the input of Fe-organic colloids
from rivers and the presence of detrital material in the sediments. 相似文献
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