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- W2156575384 abstract "Summary 1. This study aimed to quantify ontogenetic changes in the drifting of Elmis aenea , Oulimnius tuberculatus , Esolus parallelepipedus and Limnius volkmari (Coleoptera: Elmidae), and to relate their drift to benthic density. Monthly samples were taken over 39 months, using three surface nets at each of two contrasting sites in a small stream: one in a deep section with abundant macrophytes, and the other in a shallow stony section. 2. Most larvae and adults were taken in the drift at night with little variation between catches in the three nets at each site. Day catches were very low, often zero. No significant relationships could be established between mean numbers in the drift catches and benthic densities. 3. When night catches were converted to drift densities (number caught per 100 m 3 of water sampled), the latter were positively related to monthly losses in the benthos, but not to benthic densities. A linear regression described the relationship, and equations for the different life‐stages within each species were not significantly different from the equation for all life‐stages combined. However, drift losses were only about 0.07% of total losses in the benthos. A severe spate in October 1967 increased the number of larvae and adults in the drift, but not drift densities, except for immature adults of E. aenea , O. tuberculatus and E. parallelepipedus . 4. Key life‐stages with the highest drift density were the earliest life‐stage soon after egg hatching for E. aenea , the start of the larval overwintering period for O. tuberculatus and L. volkmari , and mature adults during the mating season for all three species. Drift density for E. parallelepipedus was too low to identify a key life‐stage. These key life‐stages corresponded with critical periods for survival in the life cycle, as identified in an earlier study in the same stream. Mortality was high during these critical periods, hence the strong relationship between drift density and benthic losses. The latter relationship was very consistent for different life‐stages within each species, and partially supported the rarely‐tested hypothesis that drift represents surplus production in the benthos." @default.
- W2156575384 created "2016-06-24" @default.
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- W2156575384 date "2007-11-20" @default.
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- W2156575384 title "Ontogenetic changes in the drifting of four species of elmid beetles elucidate the complexity of drift-benthos relationships in a small stream in Northwest England" @default.
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- W2156575384 doi "https://doi.org/10.1111/j.1365-2427.2007.01884.x" @default.
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