Topic
Lycosa
About: Lycosa is a research topic. Over the lifetime, 212 publications have been published within this topic receiving 3837 citations.
Papers published on a yearly basis
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Papers
TL;DR: Comparison of weights and body dimensions of individuals from field populations with those of known nutritional status showed that lack of food is a problem for field populations of both species, suggesting that starved individuals have the capacity to double their body weight through ingestion of large amounts of food when available.
Abstract: Effects of starvation were investigated in two species of spiders to gain insight on how these predators deal with an unpredictable food supply. Comparison of weights and body dimensions of individuals from field populations with those of known nutritional status showed that lack of food is a problem for field populations of both species. Adult survival times under starvation conditions averaged 208 days for the wolf spider, Lycosa lenta, and 276 days for the cribellate web-builder, Filistata hibernalis. Potential adult life spans for fed individuals were estimated to be 305 days for L. lenta and several years for F. hibernalis. Both spiders have metabolic rates significantly lower than those of other poikilotherms of similar size, and when starving, reduce their metabolic rates by 30% to 40% without any apparent decrease in their normal capabilities. The difference in survival times under starva- tion conditions of the two species was found to be inversely related to metabolic rate. This suggests that the relatively low metabolic rates characteristic of spiders as well as their capacity to reduce these rates when starving are adaptive in survival where prey are scarce. That starved individuals have the capacity to double their body weight through ingestion of large amounts of food when available may be an adaptation to their predation.
311 citations
TL;DR: The species may be its own most important predator, and the food taken appears to differ at different times of year; this is more probably due to change in abundance of prey than to changes in preference by the spider.
Abstract: 85 % of the prey ofLycosa lugubris (Walckenaer) consists of Diptera, Hemiptera and Araneae. The food taken appears to differ at different times of year; this is more probably due to changes in abundance of prey than to changes in preference by the spider. L. lugubris is not an active predator. It does not run down its prey but remains motionless and captures what comes within reach. It probably feeds infrequently in the field and it carries its prey for between one and two hours. An attempt was made to assess possible predators, and the species may be its own most important predator.
134 citations
Journal Article•
TL;DR: There was significantly lower survivorship of spiders raised on monotypic prey in both species, although the pattern of mortality over time varied between species, and the hypothesis of Greenston e (1979) that lycosids require a mixed diet is supported.
Abstract: Observations from previous studies have indicated that lycosid spiders often die before maturin g when raised on only one prey type. Two wolf spider species(Lycosa helluocollected from Florida, andLycosa sp. collected from Kentucky) were used to test the hypothesis that diet affects survivorship . Siblings from one egg sac of each species were divided into two groups of 50 spiderlings each, and reared under identical condition s with different diets . The polytypic diet consisted of crickets (Acheta domesticus), fly grubs (Sarcophaga bullata), cockroaches(Periplaneta americana), mealworms (Tenebrio molitor),beetles (Dermestes sp .), and an occasional supplemental orthopteran collected from the field . The monotypic diet consisted only of crickets (A. domesticus) . There was significantly lower survivorship of spiders raised on monotypic prey in both species, although the pattern of mortality over time varied between species. There were also significant differences in certain bod y size parameters (cephalothorax width, total leg I length, patella-tibia length) measured at maturity betwee n spiders raised on polytypic or monotypic diets in one species (L. helluo). In addition, Lycosa helluoraised on polytypic diets reached sexual maturity earlier than those reared on monotypic prey . These results suggest tha t there are fitness-related consequences of dietary breadth in spiders, and support the hypothesis of Greenston e (1979) that lycosids require a mixed diet.
112 citations
108 citations
TL;DR: Most insecticides did not significantly reduce populations of spiders and M. atrolineata compared with untreated checks, but they did reduce numbers of C. lividipennis and Lycosa pseudoannulata.
Abstract: Thirty-five insecticides used on rice in Asia were tested in the field against Nilaparvata lugens . The most important predators of the pest, Cyrthorhinus lividipennis , Microvelia atrolineata , and predacious spiders, Lycosa pseudoannulata , Tetragnatha and Araneus species, were also momtored in the test plots. Ten insecticides significantly reduced numbers of N. lugens , but propoxur and ethylan gave the most consistent and effective control. Most insecticides did not significantly reduce populations of spiders and M. atrolineata compared with untreated checks, but they did reduce numbers of C. lividipennis . Fifteen treatments caused resurgence of N. lugens , resulting in significantly higher numbers in the treated plots than m untreated checks. Resurgence was apparently not caused by the toxicity of the materials against predators. Eleven of the insecticides had no effect on N. lugens .
106 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2021 | 6 |
| 2020 | 6 |
| 2019 | 2 |
| 2018 | 2 |
| 2017 | 7 |
| 2016 | 2 |