Does UV play a role in changes in predation and zooplankton community structure in acidified lakes?
Article Abstract:
The role of ultraviolet radiation (UVR) in changes in predation and zooplankton community structure has been studied in acidified lakes. Anthropogenic acidification of lakes can bring changes in zooplankton community structure and zooplanktivorous predators, but changes in pH alone cannot explain the the patterns that arise. Dissolved organic carbon (DOC) goes down, and it is the main factor in varying depth of penetration of UVR. UVR tolerance of larvae of two widespread, abundant zooplanktivorous predators were studied. Then in in situ incubation experiments, a sunfish and a midge were studied in a high-Doc and a moderate-DOC lake. The midge died in less than a day with high solar radiation conditions in surface water of a low-Doc lake. The sunfish survived more than a day.
Publication Name: Limnology and Oceanography
Subject: Earth sciences
ISSN: 0024-3590
Year: 1999
User Contributions:
Comment about this article or add new information about this topic:
Dissolved organic carbon and nutrients as regulators of lake ecosystems: resurrection of a more integrated paradigm
Article Abstract:
A more integrated paradigm would be revived if dissolved organic carbon and nutrients were again seen as regulators of lake ecosystems. Trophic status is the main interpretive paradigm in studying lakes. Lake characterization should extend beyond the nutrient-productivity paradigm. Numerous threats to lake ecosystems are recognized. A paradigm that includes colored dissolved organic carbon. CDOC as well as nutrients would be useful in predicting and understanding response of lake ecosystems to multiple stressors. Some operational definitions that allow for placing some of the major lake types on the axes would be added. Data from various lakes and a successional sequence in Glacier Bay, AK, illustrate potential usefulness of the 2-axis model in separating lake types.
Publication Name: Limnology and Oceanography
Subject: Earth sciences
ISSN: 0024-3590
Year: 1999
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: Far-field effects of Late Miocene subduction in the Eastern Carpathians: E-W compression and inversion of structures in the Alpine-Carpathian-Pannonian region
- Abstracts: Effects of agriculture, urbanization, and climate on water quality in the northern Great Plains. Direct and interactive effects of allochthonous dissolved organic matter, inorganic nutrients, and ultraviolet radiation on an alpine littoral food web
- Abstracts: Variability in responses to nutrients and trace elements, and transmission of stressor effects through an estuarine food web
- Abstracts: Phosphorus in rainwater: partitioning inputs and impact on the surface coastal ocean. Dissolved organic nitrogen and phosphorus pools and fluxes in the central Atlantic Ocean
- Abstracts: The dynamics of insect-pathogen interactions in stage-structured populations. Aggregation and the population dynamics of parasitoids and predators