1,081 results — topic: Wildlife Behavior
Mammalian Population Genetics
Optimal foraging, plant density and the marginal value theorem
Bees did not perform exactly as the marginal value theorem predicted they should to maximize their rate of net energy intake, which strongly implies that optimal foraging models which predict a shift in any particular behavior in response to environmental conditions are too simplistic to accurately
Pollinator choice and stabilizing selection for flower color in Delphinium nelsonii
Circannual rhythms of food consumption, body mass, and metabolism in yellow-bellied marmots
The circannual cycle of MR is suggested as the driving force underlying the cycles of food consumption and Bm in marmots, which corresponds well with observed differences in above-ground activity between the two populations.
Water budgets of montane-mesic and lowland-xeric populations of yellow-bellied marmots
Spatial and temporal components of resource assessment by flower-feeding insects
(1) Per-flower insect visitation rates on two plant species within Rocky Mountain subalpine meadows were measured using fluorescent powders and found to be positively correlated with local flower density, suggesting that insects concentrate their foraging in dense patches of flowers. (2) Visitation
Field measures of flower constancy in bumblebees
Optimal foraging in hummingbirds: rule of movement between inflorescences
The movements of hummingbirds between inflorescences of scarlet gilia exhibited the following patterns: Although the hummingbirds appeared to avoid moving to the previous inflorescence, no significant correlation was found between the directions of successive inter-inflorescence movements.
Hummingbird foraging on artificial inflorescences
Bumblebee response to variation in nectar availability
I examined the response of bumblebees to two kinds of spatial variation and two kinds of temporal variation in nectar levels. The spatial variation involved differences in reward value among plant species and differences in nectar availability among patches of flowers of a single species. The tempor
Embryological induction and predation ecology in Daphnia pulex
Results of laboratory experiments suggest that a water‐soluble factor released into the environment by the predacious phantom midge larva Chaoborus americanus (Diptera: Chaoboridae) causes embryos of the waterflea Daphnia pulex Leydig 1860 emend. Richard 1896 (Crustacea: Cladocera) to develop into a
Ecological determinants of food plant choice in the checkerspot butterfly Euphydryas editha in Colorado
Optimal foraging in bumblebees: why is nectar left behind in flowers?
Queen bumblebees (Bombus appositus) leave nectar behind in Delphinium nelsoni flowers with high-standing crops of nectar, and residues predicted by an optimal feeding hypothesis agree with field measurements.
Pollinator flight directionality and the assessment of pollen returns
It is suggested that bumblebees foraging for pollen may not perceive revisitations and their associated costs because they do not assess pollen returns on a per plant basis, and energetic-efficiency arguments predicting the pattern of foraging movements among plants may be inappropriate.
Optimal foraging in bumblebees: hunting by expectation
Predictions of the three hypotheses concerned with hunting by expectation were tested experimentally by varying the quality of plants (amount and distribution of nectar) encountered by bumblebees (Bombus appositus).