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- W1490167994 abstract "Little or no infonnation is available on the mechanisms of UV tolerance exhibited by stream macroinvertebrates. This study used a standard UV exposure apparatus (UV phototron) to examine the UV tolerance of several species of mayfly nymphs. The UV phototron separates UV tolerance into two component mechanisms of defense: photoenzymatic repair (PER) and dark repair and photoprotection (DRPP). Nymphs of the dominant mayfly species were collected from seven study streams with varying UV transparencies from the Lehigh River watershed. Organisms were exposed to multiple levels of UV in the phototron in the presence and absence of photorepair radiation (PRR). UV tolerance in all mayfly species was substantially greater than the tolerance of zooplankton collected from lakes in the same geographic region. Tolerance was not, however, related to the UV transparency of the stream. Of the five species for which the mechanisms of UV tolerance were examined, none appear to use PER. This is in contrast to many tested lake species that depend heavily on PER. This is the first study to document the effect of photorepair radiation in benthic macroinvertebrates in streams. Even with the substantial levels of DRPP used by some benthic macroinvcrtebrates, mayflies are likely to incur UV damage in the absence of behavioral avoidance of full solar UV in the benthos of streams. PART 1: INTRODUCTION AND LITERATURE REVIEW" @default.
- W1490167994 created "2016-06-24" @default.
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- W1490167994 date "2004-01-01" @default.
- W1490167994 modified "2023-09-27" @default.
- W1490167994 title "Mechanisms of UV radiation tolerance displayed by benthic stream mayfly nymphs" @default.
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