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Density-dependent constraints on parasite growth, survival or reproduction are thought to be important in preventing the unchecked increase in parasite numbers within individual hosts or host populations. While it is important to know where, and with what severity, density dependence is acting...
Effect of age of the intermediate host Tribolium confusum (Coleoptera) on infection by Hymenolepis diminuta (Cestoda).Download
A cross-sectional study of 27 cohorts of Tribolium confusum aged 2–78 wk was done to examine effects of host age on exposure to eggs of Hymenolepis diminuta under standardized conditions. Pre-exposure, fasting, and postexposure mortality were low, sex ratio was equal, and fecundity of hosts was...
Intrinsic rate of increase and temperature coefficients of the aphid parasite Ephedrus californicus baker (Hymenoptera: Aphidiidae)Download
The demographic statistics and the temperature requirements for development of Ephedrus californicus Baker were determined under constant laboratory conditions. At 23°C, females provided each day with forty 2nd-instar pea aphids, Acyrthosiphon pisum (Harris), lived for 13.4 days and laid 1193...
Life History Strategies in Extreme Environments: Comparative Demography of Arctic and Alpine PtarmiganDownload
Abstract: Arctic and alpine habitats are extreme environments characterized by short breeding seasons, cold temperatures, limited food availability, and potentially high predation rates. Stringent ecological conditions are likely to have important consequences for the evolution of life history...
Shape Variation of Cysticercoids of Hymenolepis diminuta (Cyclophyllidea) from Fed, Partially Fed, and Fasted Tribolium confusum (Coleoptera)Download
Quantitative studies of a crowding effect on cysticercoids of Hymenolepis diminuta in the intermediate host are few and limited in scope. In this study, we developed a technique to rapidly collect morphological information on large numbers of parasites, and verified the utility of geometric...