The Population Biology of Dugesia Tigrina (Platyhelminthes: Turbellaria) in a Thermally Enriched Alberta, Canada Lake

The Population Biology of Dugesia Tigrina (Platyhelminthes: Turbellaria) in a Thermally Enriched Alberta, Canada Lake

The triclad flatworm Dugesia tigrina (Girard) is abundant in Lake Wabamum, a west-central Alberta lake receiving thermal effluent. A 14-month study was carried out to investigate D. tigrina's population ecology and the effect a thermally altered environment might have on Dugesia. Our data suppo...

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Veröffentlicht in:Ecology. - John Wiley and Sons, Inc.. - 59(1978), 5, Seite 966-975
1. Verfasser: Folsom, Todd C. (VerfasserIn)
Weitere Verfasser: Clifford, Hugh F.
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 1978
Zugriff auf das übergeordnete Werk:Ecology
Schlagworte:Alberta Dugesia tigrina intraspecific competition life cycle macrophyte harvesting population biology thermal effluent Tricladida Biological sciences Applied sciences mehr... Environmental studies Social sciences Physical sciences
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520 |a The triclad flatworm Dugesia tigrina (Girard) is abundant in Lake Wabamum, a west-central Alberta lake receiving thermal effluent. A 14-month study was carried out to investigate D. tigrina's population ecology and the effect a thermally altered environment might have on Dugesia. Our data support the hypothesis that D. tigrina is limited by intraspecific competition for food during and after reproduction. In spring, both the normal water and heated water triclad populations grew rapidly and produced cocoons. Recruitment of young intensified food competition, causing shrinkage and mortality. The spring gain in length and weight was lost through shrinkage of individuals, and numbers of triclads in autumn were similar to prebreeding numbers. Hence the hypothesis is supported for populations in the thermally altered and the normal lake habitats. Triclads from the thermally enriched environment were found to be 2x as fecund as normal lake triclads. Cocoon production was probably increased to some extent by thermal effluent. However, the elevated mortality rate caused by the mechanical harvesting of abundant macrophyte populations in the warm water area, estimated at 1-3x the standing crop of triclads, probably accounts for much of the increased fecundity. 
540 |a Copyright 1978 The Ecological Society of America 
650 4 |a Alberta 
650 4 |a Dugesia tigrina 
650 4 |a intraspecific competition 
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650 4 |a Biological sciences  |x Biology  |x Botany  |x Marine botany  |x Aquatic plants  |x Macrophytes 
650 4 |a Environmental studies  |x Atmospheric sciences  |x Climatology  |x Seasons 
650 4 |a Social sciences  |x Population studies  |x Mortality 
650 4 |a Biological sciences  |x Agriculture  |x Farming  |x Crop production  |x Crop harvesting 
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650 4 |a Physical sciences  |x Earth sciences  |x Hydrology  |x Limnology 
650 4 |a Physical sciences  |x Physics  |x Thermodynamics  |x Thermal analysis  |x Temperature  |x Water temperature 
650 4 |a Biological sciences  |x Ecology  |x Population ecology 
655 4 |a research-article 
700 1 |a Clifford, Hugh F.  |e verfasserin  |4 aut 
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