Measuring Invertebrate Predation in situ on Zooplankton Assemblages

Lane, Patricia A.; Klug, Michael J.; Louden, Louise

doi:10.2307/3225057

Cited by 11 publications

(2 citation statements)

References 12 publications

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“…Intense visual predation selecteq for increased transparency, early maturity, reduced growth rates (Brooks 1965, Zaret 1975, or for effective evasive behavior ("escape reactions," Confer and Blades 1975) in the prey. In other studies, conducted in the open-water regions of hoiarctic lakes where fish predation was much reduced, D I G predatory copepods were found to draw heavily from small or fragile-bodied zooplankton populations (Kerfoot 1975, 1977a, Lane et al 1976, Confer and Cooley 1977, Brandl and Fernando 1978. These invertebrate predators sense prey primarily with mechanoreceptors (Strickler and Bal 1973) that perceive water disturbances (Strickler 1975, Kerfoot 1977a, 1978.…”

Section: Introductionmentioning

confidence: 96%

Predatory Copepods and Bosmina: Replacement Cycles and Further Influences of Predation Upon Prey Reproduction

Kerfoot¹,

Peterson²

1980

Ecology

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In the days of large lakes, populations of cladocerans and rotifers often appear to undergo seasonal morphological changes. In the past, these transformations were thought to reflect phenotypic plasticity within lineages (cyclomorphosis). However, in Union Bay populations of Bosmina, the transformations clearly involve regular seasonal replacements (termed "taxocene cycles") by genetically different lineages. In Union Bay, Washington, USA, selective predation by both visually foraging and blindly grasping predatrory copepods, combined with reproductive and competitive costs associated with prey defense, created a spatial and temporal environment where the seasonally fluctuating selective regimes exceed the ability of individual lineages to adapt phenotypically to changes. Genetically different clones, some derived from biologically isolated populations, rapidly replace one another in time and space. While most clones remain extant throughout the year, even times of relatively small density differences are punctuated by rapid clonal replacement. Detailed study of the clonal replacements disclosed that: (1) phenotypes generally fall into three modal classes (short—, intermediate—, and long—featured forms); (2) the short and longs are separate species; and (3) intermediates are not the results of crosses between extremes, but are heterogeneous mixtures of convergent lines derived from the other two species. While there is limited sexual activity, and certainly opportunity for mating between clones, there is no electrophoretic evidence for crossing. The distinctive nature of certain secondary sexual features seems associated with mate choice and thus aids the isolation of various lineages. In general, the frequency of sexual activity, the evolution of the brood chamber, and the transparent ephippium all appear intimately associated with predation and the selective advantage of rapid reproductive responses.

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Section: Introductionmentioning

confidence: 96%

Predatory Copepods and Bosmina: Replacement Cycles and Further Influences of Predation Upon Prey Reproduction

Kerfoot¹,

Peterson²

1980

Ecology

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“…Secondly, the feeding rate or the metabolic rate of fish has been measured in the laboratory and these rates extrapolated to field conditions. Comparable methods have been used by Hillbricht-Ilkowska & Karabin (1970), Kajak & Ranke-Rybickova (1970) and Lane et al (1975) to measure the predation rate of zooplankters. Brett, 1971;Elliott, 1975;Elliott & Persson, 1978;Kamler et al, 1987;Marmulla & Rosch, 1990) or indirectly from the energy requirements of fish (e.g.…”

Section: Introductionmentioning

confidence: 99%

Experimental estimation of the food intake of larval vendace (Coregonus albula L.) under field conditions

Viljanen

1992

Hydrobiologia

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We estimated the food intake of larval vendace (Coregonus albula L.) directly in an experimental chamber under field conditions. The larvae were stocked into net enclosures and reared without additional feeding for 6 weeks immediately after the ice melted in Lake Yla-Enonvesi, Eastern Finland. The food intake was estimated on the basis of the decrease in zooplankters due to larval predation in the transparent plastic chambers anchored in the littoral zone. The experiments were carried out twice in 1988 and three times in 1989 (May-June). The numbers of zooplankters inside the chambers were counted from the subsamples using an inverted microscope. The relative daily ingestion rate (mg dry mass of prey animals mg dry mass of fish -' 24 h -') of the larvae of different sizes was: 1.09 and 0.84 for 9-11 mm larvae, 1.27 for 11-13 mm larvae and 0.34 for 17-20 mm larvae. The measured ingestion rate is presumed to be near the maximum consumption of the larvae. This method could provide accurate estimates of food consumption in the field or in-the laboratory.

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Experimental estimation of the food intake of larval vendace (Coregonus albula L.) under field conditions

Viljanen

1992

The Dynamics and Use of Lacustrine Ecosystems

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Measuring Invertebrate Predation in situ on Zooplankton Assemblages

Cited by 11 publications

References 12 publications

Predatory Copepods and Bosmina: Replacement Cycles and Further Influences of Predation Upon Prey Reproduction

Predatory Copepods and Bosmina: Replacement Cycles and Further Influences of Predation Upon Prey Reproduction

Experimental estimation of the food intake of larval vendace (Coregonus albula L.) under field conditions

Experimental estimation of the food intake of larval vendace (Coregonus albula L.) under field conditions

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