Robert B . Suter

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Bowl and doily spiders, Frontinella pyramitela (Araneae, Linyphiidae), copulate much longer than the 15 min required for insemination. This apparently maladaptive behavior has been satisfactorily explained in the literature by invoking hypotheses that involve sperm competition, resistance to predators and parasites, or foraging enhancement. In this study,(More)
1. The Linyphiid spider Frontinella communis changes its orientation from random with respect to the sun (Fig. 1A) to aligned with the rays of the sun (Fig. 1B) on days when both insolation and ambient temperature are high (Fig. 2). The orientation is not mediated by visual photoreception. Because the orientation behavior is not elicited when insolation is(More)
To evaluate the versimilitude of theoretical and mechanical models of fish and fish-like propulsive systems, we compared quantitatively the motion of undulatory body waves using a Fourier-based method. The undulatory motions of a freely-swimming lamprey were compared to a series of theoretical and physical models. For each swimming trial, Fourier series of(More)
Burrowing wolf spiders, Geolycosa sp. (Araneae:Lycosidae), excavate vertical burrows and inhabit them throughout their lives or, in the case of males, until they mature and wander in search of mates. Three species: G. fatifera Kurata, G. missouriensis Banks, and G. rogersi Wallace were studied to understand how and at what expense the burrowing is(More)
1. The spider orb web is a structure that both restrains prey animals and carries prey-generated signals to the spider. If spiders are to discriminate among prey items without risking movement in the open and contact with potentially dangerous prey, they must be capable of interpreting web-borne vibrational signals appropriately. 2. To assess this ability(More)
Adult male bowl and doily spiders, Frontinella pyramitela (Walckenaer) (Linyphiidae), occupy females' webs during courtship, mating, and foraging. When males are abundant, they can be found on about 20% of all adult females' webs, and encounters between the territorial resident males and intruder males occur frequently. Stereotyped interactions take place(More)
Three experiments were conducted to control for the effects of housing conditions during play deprivation on subsequent play rebound in periadolescent rats. To address play deprivation without the confound of social isolation, in Experiment 1, pairs of subjects were housed either in cages divided by wire mesh that allowed for olfactory, visual, auditory,(More)
The bowl and doily spider, Frontinella pyramitela (Araneae, Linyphiidae), typically hangs at the lowest point on its concave upward, bowlshaped web (Fig. 1). It returns to the same area after prey capture, courtship, or repulsion of intruders, and naive spiders of either sex come to rest at the same “center of preference”. Because the “center of preference”(More)