Aggressive contests in male jumping spiders

Contact phase duration was predicted most strongly by the weight of losing males relative to that of winning males, suggesting that P. Jumping spiders have been the focus of several recent studies on male—male aggression Jackson ; Wells ; Jackson and McNab ; Faber and Baylis ; Clark et al.

A male was considered to have won a bout when the rival male turned away and retreated for more than two body lengths.

Hobo Spiders

Body size was not related to either duration or escalation in the contact phase of contests. Our observations document several key differences between the sexes: The assessment of RHP can occur based on characters that correlate with fighting ability reviewed in Hsu et al.

Furthermore, when opponents signaled, the number of signals produced by females was smaller than that produced by males male vibrations: Vibratory behaviour predicted pre-contact phase duration, with higher signaling rates and larger differences between contestants leading to longer pre-contact interaction times.

Using statistical methodology that allows discrimination between assessment types, we examined contests in the jumping spider Phidippus clarus.

If males did not court or interact with the female, both the male and the female were removed from any analyses. Courtship began when the male and female oriented toward each other and ended when copulation began or the min trial period ended. It is yet unknown whether substrate borne signals are important in aggressive contexts.

Often fights occurred at the wall of the arena where losing males were not able to escape readily. Males of this species exchange ritualized vibratory and visual signals prior to contact and, in most cases, engage in direct contests consisting of leg fencing and grappling Hoefler; Elias et al.

As contests are inherently an interaction, contest duration might be expected to depend critically on the relative properties of contestants. The laser was positioned at the closest point possible to the spiders at the start of each interaction.

Previous article in issue. In later studies, Prenter et. We used a binary logistic regression to determine the effects of latency-to-molt asymmetry, weight asymmetry, and resident status on contest outcome. This method has been used successfully in previous experiments on males Elias et al.

Experimental Setup At least four days prior to experiments, males were weighed and numbered. A piece of graph paper, cut to fit inside the cylinder, was used as the arena floor.

Assessment during aggressive contests between male jumping spiders

Precontact staring phases lasted However, recent studies show that female—female fights in some of these same species tend to be less ritualized, riskier, and appear to be uncorrelated with resource holding potential, hereon RHP Robinson ; Koivula et al.

In the latter part of the season, when most females have mated at least once, males wander and may encounter further mating opportunities outside of hibernacula. We studied contests between the female jumping spider, Phidippus clarus, and compared them with male—male contests in this same species.

In addition, we recorded the number of substrate-borne signals produced by each male. In addition, we noted the occurrence of vibratory signals from each male during the recording procedure.

A piece of reflective tape ca. In addition we modified some of these analyses. Hobo spiders prefer dark, damp hiding places and often make garages and basements their homes. Several recent empirical studies have supported the self assessment hypothesis Taylor et al. Early in the breeding season, immature females inhabit silken retreats hibernacula that are built within rolled-up leaves Hoefler and Jakob ; Elias et al.Vibrational signal components have been shown to function in male aggressive contests but their role in courtship has not been investigated.

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Jun 12,  · Hunting An Aggressive Jumping Spider! - Duration: Bob TheSpiderHunter 1, The most aggressive spider in the world and one of most dangerous.

- Duration: Jean-Luc Sanchez. In summary, our results show that in the jumping spider P. clarus, even though males use multimodal signals in aggressive contests, contests are determined predominantly by a male’s assessment of his own fighting ability.

However, our statistical examination of covariances between traits of rivals also suggests that mutual assessment plays a. The male jumping spiders used multimodal signals during aggressive interactions: visual and substrate-borne.

Substrate-borne vibrations appeared to be of particular importance, given that the number of vibratory signals accurately predicted the contest outcome. Oct 04,  · For These Tiny Spiders, It's Sing or Get Served | Deep Look the male jumping spider performs an exuberant dance to get the female’s attention.

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Aggressive contests in male jumping spiders
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