Local versus regional factors
Subtitle: what controls the recovery of zooplankton species diversity from cultural acidification?
Published: 2004
Language: eng
Number of pages: 55
Description: The role of local and regional processes in zooplankton recovery from acidification was studied using field enclosure and emergence trap experiments. Results indicate that dispersal and interactions with the local abiotic and biotic environment limit the establishment of some colonizing species, with the effect being species specific. Daphnia sp. and  Ceriodaphnia lacustris abundances were decreased at low pH,  Skistodiaptomus oregonensis and Diacyclops bicuspidatus thomasi had a negative interaction with the resident community, and  Mesocyclops edax was unaffected by any treatment. Species may be dispersal limited by external sources, but internal colonization from resting stages may be possible for some. Evidence suggests that Swan Lake has a viable diapausing egg bank that may provide a source of colonists. Environmental conditions appear to be vital for hatching. Biological recovery of Swan Lake may be possible with further improvements in water chemistry and the return of past species to surface sediment layers.
Notes: Adviser:  Gary Sprules.

Thesis (M.Sc.)--University of Toronto, 2004.

Electronic version licensed for access by U. of T. users.

Source: Masters Abstracts International, Volume: 42-06, page: 2126.

MICR copy on microfiche (1 microfiche).