Food quality for detritivores in streams of contrasting pH
Food quality for detritivores in streams of contrasting pH
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pH 值不同的溪流中食碎物动物的食物质量
DOI：
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发表时间：
1989
期刊：
影响因子：
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通讯作者：
A. Groom
中科院分区：
文献类型：
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作者：
A. Groom
(1) 将桤木 (Alnus glutinosa Gaertner) 和山毛榉 (Fagus sylvatica L.) 的叶子置于酸性和中性流中进行调节。然后，将垃圾袋中的经过处理的叶子进一步暴露一段时间，要么将其更换到同一流中，要么转移到对比流中。 (2) 在暴露于同一水流中的前 8-16 天，在中性水中调节的叶表面微生物的呼吸速率高于在酸性水中调节的叶表面微生物的呼吸速率：这对应于微生物生物量的差异。两个物种的中性叶片的碳氮比均低于酸调节叶片。对于桤木，由于叶片调节而导致的差异在同一溪流中暴露约 14 天后仍持续存在。起初稀缺的铝在调理过程中在所有叶子上明显积累。在进一步暴露过程中，铝含量仅在桤木中增加，在酸流中增加率最大。 （3）无脊椎动物在两条溪流中的叶袋中定居，尽管在中性周围的溪流中有些不稳定：无论条件如何，叶种在这方面都是相似的。然而，在酸流中，在暴露的前 8 天中，中性细菌的定植速度比酸调节的桤木更快，此时食品质量的差异最为明显。 (4) 取食这两个物种的酸性或中性条件叶子，对石蚕 Lepidostoma hirtum (Fabricius) 的生长没有显着差异，但石蝇 Nemurella pictetii (Klapalek) 在中性条件垫料上比在酸条件垫料上生长得更快。
(1) Leaves of alder (Alnus glutinosa Gaertner) and beech (Fagus sylvatica L.) were conditioned in an acid and a circumneutral stream. Conditioned leaves in litter bags then underwent a period of further exposure, either having been replaced in the same stream or transferred to the contrasting stream. (2) The respiration rate of microbes on leaf surfaces conditioned in circumneutral water was greater than on those from acid water, for the first 8-16 days of exposure in the same stream: this corresponded to differences in microbial biomass. Carbon-nitrogen ratios were lower in the neutral than the acid-conditioned leaves of both species. For alder, differences due to leaf conditioning persisted for about 14 days of exposure in the same stream. Aluminium, scarce at first, accumulated markedly on all leaves during conditioning. During further exposure aluminium content increased in alder only, the rate being greatest in the acid stream. (3) Invertebrate animals colonized the leaf bags in both streams, although somewhat erratically in the circumneutral stream: leaf species were alike in this, irrespective of conditioning. However, in the acid stream, there was faster colonization of neutral than there was of acid-conditioned alder over the first 8 days of exposure, when differences in food quality were most marked. (4) Feeding on acid or neutral-conditioned leaves of both species produced no significant difference in the growth of the caddis Lepidostoma hirtum (Fabricius), but the stonefly Nemurella pictetii (Klapalek) grew faster on neutral-conditioned litter than on acid-conditioned litter.