Hunting

Argiope argentata follows a distinct sequence of steps when capturing, killing, and ultimately eating its prey. The first step is localization of the prey, for which the spider’s vibration receptors are critical. The second step is immobilization of the prey which involves two steps: wrapping and biting. The second step consists of either a long or short bite depending on the type of prey. The third step is transportation, which involves carrying the prey back to where the spider was alarmed of its presence. In the fourth and final step before feeding, the spider manipulates the orientation of the prey so that it is in the proper positioning for the spider to consume.^[7]

The determining bite length is an important component of prey immobilization. It is determined by the spider by momentarily touching the prey before biting. This contact allows the spider to determine in some manner what the prey is, and what its immobilization will entail.^[7]

Biting prey

Argiope argentata exhibits two different forms of biting to its prey, which are differentiated by the duration of the bite: the short bite versus the long bite. For Lepidoptera, i.e. moths and butterflies, A. argentata performs a long bite, in contrast to the short bite given to other insects. Another juxtaposition between these two methods of predation, is that the long bite is executed before the prey is wrapped in silk, whereas the short bite is executed after. One hypothesis for the difference in bite duration is that the long bite utilizes the spider's venom to immobilize the prey, whereas the short bite is unnecessary because the prey has already been immobilized by the silk wrapping.^[7]

Since the short bite is given after the prey has been immobilized by other tactics, a separate hypothesis for its purpose has been proposed. For starters, the venomous content in this bite is likely to be slim to none. Since the prey is already immobilized and dead, venom is not necessary and would be a waste of the A. argentata's predatorial resources. Rather, this short bite may serve as a quote-on-quote "taste-tester" for the spider. This "taste-tester" supposedly gives the A. argentata sufficient information on the prey it has caught to determine whether or not it is consumable.^[7]

Diet

Argiope argentata eats butterflies and moths, both of which require a long bite upon first encounter. This is contrary to other insects that are immediately wrapped in silk.^[7] It also preys upon mosquitoes, grasshoppers, and flies.^[8]

The species incorporates UV-reflecting silks into its web design which serve as an attractor to their prey. These patterns have been hypothesized to specifically attract prey that engage in pollination. Flowers incorporate UV-reflecting patterns to ensure their pollination by insects. Since the webs of A. argentata have been shown to capture pollinating species, such as Trigona spinipes, a species of bees, it is sound logic that their UV-reflecting silk serves the same purpose obtained by a flower's UV-reflecting patterns.

Webs

Like other members of Argiope, silver argiopes often spin stabilimenta into their webs.^[9] These often take the form of zigzag lines,^[9] and frequently there are four of them^[9] forming a centerless "X" shape near the center of the web; the spider then rests in the very middle, with four pairs of legs each drawn together and splayed out in an "X" shape more or less aligned with the stabilimentum "X".

Silks

Argiope argentata is in the family Araneidae, otherwise known as orb-weavers.^[6] Like other orb-weavers, A. argentata has seven distinct silks, five of which are fibrous. These silks differ in many ways including the silk gland they are ejected from, their mechanical properties, and their protein composition. Four of the fibrous silks, aciniform, major ampullate, minor ampullate, and tubiliform, are considered dry silks, and the remaining fibrous silk, capture spiral, is considered a wet silk.^[11]

Sexual cannibalism

Argiope argentata spider engages in sexual cannibalism, during or after copulation, without fail. The act of sexual cannibalism amongst A. argentata has been looked at more closely in the laboratory with virgin females. Upon the first attempt at mating, the female spider thrusts the male spider off of her, which results in his death more than two-thirds of the time. Males that survive, bravely try again, this time with success, only to be met with immediate cannibalism after the act of insemination is completed.^[12]

Plugging

As a consequence of post-coital cannibalism, males generally have a single chance at successful mating. As an evolutionary strategy to ensure gene propagation, they engage in "plugging", in which the male breaks off its copulatory organ, securing it into the female, thus preventing future insemination by rivals.^[12]

Grooming

Argiope argentata engages in grooming behavior post prey capture. The duration and intensity of this grooming behavior has a specific connection to the type of prey that was captured. The spider deliberately grooms the tarsal region on each of its eight legs, which is hypothesized to be due to the ability of these structures to respond to chemical changes using chemosensory organs. There is no evidence that A. argentata extends this grooming behavior to the rest of its body.^[13]

Defecating

The act of defecation occurs most frequently after biting the prey or feeding on it, and is a very calculated process. A. argentata consciously widens the space between its abdomen and its web before defecating, to ensure that the web itself is not soiled. A. argentata’s anus is positioned away from the web, so that the defecation itself will be excreted away from the web.^[13]

Drinking

Argiope argentata is found to receive its water supply from the web’s surface. The web is able to capture and hold droplets of water for A. argentata to drink. It appears that this is the supplier of water for the spider, regardless of the presence and degree of other environmental conditions. For example, the spider is not reliant on the humidity of the air or the water content of the prey.^[13]

Predators

Lizards are significant predators of A. argentata, as can be seen by the so-called "lizard effect". That is, within island habitats, there is a negative correlation between the number of lizard inhabitants and the number of A. argentata. Other predators include wasps and birds.^[14]

Parasites

As skilled web designers and catchers of prey, Argiope argentata are frequently the target of food theft by other species. Dewdrop spiders (genus Argyrodes) are small kleptoparasitic or commensal spiders that can often be found living in the webs of A. argentata, where they feed on insects trapped by their host's web.^[9] Due to silver argiopes' poor vision, these intruders are usually able to escape detection and consequences for their trespass and thievery.