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A. Grémare 《Marine Biology》1988,97(2):243-252
The present study was aimed at obtaining new information on the feeding biology of the terebellid polychaete Eupolymnia nebulosa (Montagu). Feeding, tube-building, particle-size selection, and tentacular morphology are described. Experiments were carried out during the fall of 1984 on specimens collected in the vicinity of Banyuls-surmer, France. Feeding activity takes place almost entirely in darkness, and E. nebulosa shows a marked preference for smaller particles when feeding and selects larger ones for tube-building. The control of its activity pattern by light intensity may result in seasonal modification of its energy balance. The mechanisms controlling particle-size selection in this species are discussed. 相似文献
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L. A. König 《Die Naturwissenschaften》1986,73(11):651-654
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Christian Huber Manuela Baumgarten Axel Göttlein Verena Rotter 《Water, Air, & Soil Pollution: Focus》2004,4(2-3):391-414
More than 85% of the mountainous spruce forest of the Bavarian Forest National Park died after bark beetle attack during the last decade. The elemental budget of intact stands and of different stages after the dieback was investigated. N-fluxes in throughfall of intact stands were lower (12–16 kg ha-1 a-1) than in an earlier study in an intact mountainous spruce stand in the Bavarian Forest National Park and were reduced in the first years after the dieback (3–5 kg N ha-1 a-1). Nitrate-N fluxes by seepage water of intact stands at 40 cm depth, which is below the main rooting zone, were moderate (5–9 kg ha-1 a-1). After the dieback of the stands, NH4 + concentrations were increased in humus efflux as were NO3 - concentrations in mineral soil. Due to the relatively high precipitation, dilution of the elemental concentrations in seepage was considerable.Therefore, NO3 - concentrations were usually below the level of drinking water (806 μmol NO3 - L-1), with lowest concentrations after the snowmelt and highest in autumn. Nitrate concentrations were elevated from the first year until the 7th year after the dieback. Total NO3 --N losses by seepage until the 7th year after the dieback equalled 543 kg N ha-1. Aluminium fluxesafter the dieback were enhanced in the mineral soil from 55 to 503 mmolc m-2 a-1 (average of 8 yr), K+ fluxes from 8 to 37 mmolc m-2 a-1, and Mg2+ fluxes from 13 to 35 mmolc m-2 a-1. The consequences for the nutritional status of the ecosystem, the hydrosphere, and forest management are discussed in the paper. 相似文献
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