Publications

dispersal depends on body condition and predation risk in the semi-aquatic insect, notonecta undulata.	dispersal is the movement of organisms across space, which has important implications for ecological and evolutionary processes, including community composition and gene flow. previous studies have demonstrated that dispersal is influenced by body condition; however, few studies have been able to separate the effects of body condition from correlated variables such as body size. moreover, the results of these studies have been inconsistent with respect to the direction of the relationship betwee ...	2015	26120421
the interactive effects of competition and predation risk on dispersal in an insect.	dispersal dynamics have significant consequences for ecological and evolutionary processes. previous work has demonstrated that dispersal can be context-dependent. however, factors affecting dispersal are typically considered in isolation, despite the probability that individuals make dispersal decisions in response to multiple, possibly interacting factors. we examined whether two ecological factors, predation risk and intraspecific competition, have interactive effects on dispersal dynamics. w ...	2014	24919703
notonecta exhibit threat-sensitive, predator-induced dispersal.	dispersal is a central process determining community structure in heterogeneous landscapes, and species interactions within habitats may be a major determinant of dispersal. although the effects of species interactions on dispersal within habitats have been well studied, how species interactions affect the movement of individuals between habitats in a landscape has received less attention. we conducted two experiments to assess the extent to which predation risk affects dispersal from an aquatic ...	2010	20164083
effects of interspecific competition, predation, and their interaction on survival and development time of immature anopheles quadrimaculatus.	we examined the effect of predation by the backswimmer (notonecta undulata; hemiptera: notonectidae), competition by zooplankton and snails, and both predation and competition on the survival and development time of larval anopheles quadrimaculatus mosquitoes in experimental mesocosms. we found that both predation and interspecific competition greatly reduced the survivorship of larvae and the number of larvae emerging into adulthood. treatments with both predators and competitors had fewer larv ...	2004	15707287
effect of prey size on attack components of the functional response by notonecta undulata.	the number of encounters per prey, the proportion of encounters resulting in attacks, and the proportion of attacks that were successful were observed while fourth-instar notonecta undulata nymphs preyed on smaller n. undulata nymphs. while encounters per prey and proportion of encounters resulting in attacks increased with prey size, the proportion of attacks that were successful decreased. the increase in encounter rate per prey was due in part to an increase in the predator's reactive distanc ...	1994	28312796
the ecological role of chemical stimuli for the zooplankton: predator-induced morphology in daphnia.	numerous adaptive predator-induced responses occurred when eight clones representing seven daphnia (crustacea: cladocera) species were tested against three common predators: fourth instar larval phantom midge chaoborus americanus, adult backswimmer notonecta undulata, and small sunfish lepomis macrochirus. the predators were confined within small mesh bags, suggesting that the signal for induction is chemical. the induced responses included longer tail spines, longer heads, smaller bodies, incre ...	1989	28312582
ultrastructure of pseudochromosomes and calottes in spermatogenic cells of the backswimmer, notonecta undulata (say).		1974	4432239
respiratory significance of the external morphology of adults and fifth instar nymphs of notonecta undulata say (aquatic heteroptera; notonectidae).		1971	5542236