Two Electivity Indices for Feeding with Special Reference to Zooplankton Grazing
Citations Over TimeTop 10% of 1979 papers
Abstract
The electivity indices E i and E i ′ of predator–prey interaction are currently used to quantify particle-size selection by grazers. Under conditions of passive, mechanical particle-size selection predicted by the leaky-sieve model, these indices yield electivity vs. particle-size curves that vary with the shape of the particle-size spectrum of food offered to the zooplankton. In addition to this bias, poor estimates of electivity will be obtained unless only a small fraction of the food is eaten in such experiments. The selectivity coefficient (W i ) used by modelers in feeding constructs and the electivity index E i *, derived here, are recommended instead because they do not suffer from the shortcomings described for E i and E i ′. Moreover, use of W i ′s and E i *'s is recommended for quantifying selection for many other cases of predator–prey interaction. Key words: electivity indices, selectivity, selective grazing, predator–prey intraction
Related Papers
- → Studies in grazing behaviour of dairy cattle: II. Bloat in relation to grazing behaviour(1954)25 cited
- → An analysis of the fundamentals of grazing management systems(1969)35 cited
- Effects of Grazing Sheep on Forage Nutrition Contents in Recovering Degraded Grassland(2011)
- → A Study on Day-grazing to Protect Sheep against Stray Dogs(1979)
- Effect of Different Grazing Systems on Nutrition of Artificial Pasture and Sheep Weight(2013)