Abiotic stress and the relative importance of interference and facilitation in montane bunchgrass communities in western Montana

Article Abstract:

Previous research has shown that positive interactions helped mold the structure of plant communities in habitats under intense abiotic stress. One such interaction that has been widely studied is facilitation. More recent research indicates that facilitation and the negative interaction known as interference can occur simultaneously. In the wake of this finding, it has been hypothesized that interference and facilitation may vary inversely along gradients of abiotic stress. This hypothesis is tested on a rare mustard and bunchgrasses subject to varying abiotic stress.

Plant communities, Grasses, Mustard, Black mustard

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Relative parental expenditure, potential reproductive rates, and the control of sexual selection in katydids

Article Abstract:

A study of katydids supports the classical parental investment theory which states that the relative parental expenditure and relative mating rates equivalent to the operational sex ratio are negatively correlated. Maximum number of offspring produced per unit has nothing to do with the control of sexual selection. Sperm competition reduces realized male reproductive rate relative to females which can effect indirectly the operational sex ratio if the males adjust their investment in tune to their confidence of paternity.

Sexual behavior, Katydids

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Trade-offs between reproductive traits and the influence of food intake during pregnancy in the garter snake, Thamnophis elegans

Article Abstract:

Garter snakes were investigated to determine how resources are allocated to present and future reproduction and to various steps of reproduction. Results indicated that feeding during late pregnancy affects postpartum weight of the mother but not the weight of the offspring there were tradeoffs between postpartum weight and litter weight in spite of individual variations in body size and food intake and snakes appear to be well suited to tests on general issues such as those investigated in this study.

Behavior, Pregnancy, Garter snakes, Reproduction (Biology), Reproduction

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