Resource dynamics and detritivore production in an acid stream
Resource dynamics and detritivore production in an acid stream
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酸流中的资源动态和食碎物生产
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
M. Dobson
中科院分区：
文献类型：
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作者：
J. Pretty;D. Giberson;M. Dobson
摘要1.生活史模式和生产的8个碎纸机，食腐动物物种进行了研究有关的碎屑动力学的一个小的酸性流在英格兰。平均每年碎屑输入（直接和横向来源相结合）约为400克米）2年）1，并表现出显着的季节性和年度变化。2.碎屑常备库存没有增加显着的高投入，反映了低保留效率的时间。然而，平均碎屑现存量相对较大（108 g/m2），反映了酸性水流典型的缓慢分解速率。3.四个物种是一化性的出现和招聘的高度同步模式（Leuctra inermis，Leuctra dupus，Capnia vidua和Amphinemura sulcicollis）。两个物种是一化性的扩展模式的出现和招聘（Nemoura cinerea，Potamophylax cingulatus）。黑叶银汉鱼显然是半化性的，而Protonemura meyeri在研究的第二年显示了两个连续的队列，这表明二化性或队列分裂。3. 1997年和1998年，占主导地位的切碎机的二次生产量分别为1.67克/米2年1和1.99克/米2年1，与欧洲其他小型溪流相比，这是很低的。这可能是因为贫穷的无脊椎动物社区和与酸性条件相关的食物质量差。食物供应可能不能解释低产量，因为碎屑现存量远远超过估计的粉碎机摄入量42-50 g m）2年）1。4.尽管低的整体粉碎机生产，物种特定的生产是高的，可能是因为竞争性释放在这个物种贫酸流。高产量和增长的时期与碎屑的可用性没有关系，但与生活史密切相关。
SUMMARY 1. Life history patterns and production of eight shredder-detritivore species were studied in relation to the detritus dynamics of a small acidic stream in England. Mean annual detritus inputs (direct and lateral sources combined) were approximately 400 g m )2 year )1 and showed significant seasonal and annual variation. 2. Detritus standing stock did not increase significantly during times of high input, reflecting low retention efficiency. However, the mean detritus standing stock was relatively large (108 g m )2 ) reflecting a slow decomposition rate typical of acid streams. 3. Four species were univoltine with highly synchronous patterns of emergence and recruitment (Leuctra inermis, Leuctra hippopus, Capnia vidua and Amphinemura sulcicollis). Two species were univoltine with extended patterns of emergence and recruitment (Nemoura cinerea, Potamophylax cingulatus). Leuctra nigra was apparently semivoltine, while Protonemura meyeri showed two successive cohorts in the second year of the study, suggesting either bivoltinism or cohort splitting. 3. Secondary production of the dominant shredders was 1.67 g m )2 year )1 in 1997 and 1.99 g m )2 year )1 in 1998, which is low compared with other small European streams. This was probably because of an impoverished invertebrate community and poor food quality associated with acid conditions. Food availability probably did not account for the low production as the detritus standing stock far exceeded the estimated shredder ingestion of 42–50 g m )2 year )1 . 4. Despite low overall shredder production, species-specific production was high, possibly because of competitive release in this species-poor acid stream. Periods of high production and growth showed no relationship with detritus availability but were closely related to life history.