| dc.contributor.author | Paterson, Michael J. | en_US |
| dc.date.accessioned | 2014-10-21T12:35:15Z | |
| dc.date.available | 1991 | |
| dc.date.issued | 1991 | en_US |
| dc.identifier.other | AAINN71507 | en_US |
| dc.identifier.uri | http://hdl.handle.net/10222/55268 | |
| dc.description | The influence of invertebrate predators on the seasonal dynamics of epiphytic and benthic microcrustacea was investigated in the littoral zone of a fishless lake called Jack Lake. Observational studies revealed that most cyclopoid copepods had two generations during the ice-free season, with maximum numbers of adults in June-July and October-November. The abundance of most species of Cladocera peaked in June-July or September-October. Numbers of all Cladocera were low in August. Changes in numbers of common cladoceran species did not follow changes in birth rates. This suggests that seasonal abundance was strongly affected by population losses, possibly from predation mortality. | en_US |
| dc.description | Gut content analyses and abundance estimates indicated that copepods, tanypod chironomids, odonates, and water mites were the most important predators of littoral microcrustacea. With the exception of instar-4 Ablabesmyia sp., seasonal changes in the abundance of these predators were not correlated with microcrustacean abundance. | en_US |
| dc.description | The influence of invertebrate predators was examined in a series of in situ enclosure experiments. Manipulations of large odonates, small odonates, tanypod chironomids, and adult water mites resulted in few statistically significant changes in microcrustacean numbers, species composition, or size structure. | en_US |
| dc.description | Taken together, the observational and experimental data suggested that invertebrate predators did not strongly influence littoral microcrustacea in Jack Lake. The potential influence of other factors on littoral microcrustacean seasonal dynamics is discussed. | en_US |
| dc.description | Thesis (Ph.D.)--Dalhousie University (Canada), 1991. | en_US |
| dc.language | eng | en_US |
| dc.publisher | Dalhousie University | en_US |
| dc.publisher | | en_US |
| dc.subject | Biology, Ecology. | en_US |
| dc.subject | Biology, Limnology. | en_US |
| dc.title | Invertebrate predation and the seasonal dynamics of microcrustacea in the littoral zone of Jack Lake, Nova Scotia. | en_US |
| dc.type | text | en_US |
| dc.contributor.degree | Ph.D. | en_US |
