Search results for "Argiope"
showing 5 items of 5 documents
Costs of courtship and mating in a sexually cannibalistic orb-web spider: female mating strategies and their consequences for males
2002
The costs of courtship and mating may include increased risks of predation, the transmission of pathogens, and a loss of foraging opportunities. Thus, a female's decision to tolerate a courting male will depend upon how these costs offset the benefits of mating, which will depend on her reproductive and nutritional status. While these costs may be similar for mated and unmated females, the benefits of mating will be less for mated than virgin females. However, the cost of lost foraging opportunities may be higher for females with fewer nutritional reserves necessary for forming eggs. We examined how these costs and benefits influence the courtship and mating behaviour of male and female orb…
Lapseņzirnekļa Argiope bruennichi (Scopoli, 1772) populācija veģetācijas struktūras un augu sabiedrību ietekmē un medību sekmes zālājos Liepājas pils…
2018
Lapseņzirneklis Argiope bruennichi pēdējo divdesmit gadu laikā ir izplatījies no Eiropas vidusdaļas līdz Ziemeļeiropai. Suga vairākās valstīs atzīta par invazīvu, un nav zināma tās ietekme uz Latvijas bezmugurkaulnieku faunu. Darba mērķis ir noskaidrot, kā veģetācijas struktūra un augu sabiedrības ietekmē lapseņzirnekļa indivīdu blīvumu parauglaukumos un noteikt sugas barības bāzi pētījuma teritorijā. Izveidotajā 31 parauglaukumā konstatēts 51 lapseņzirneklis. Augu grupām nav saistība ar lapseņzirnekļa indivīdu blīvumu parauglaukumos, toties konkrētu augu sugu projektīvajiem segumiem ir būtiska saistība ar lapseņzirnekļa indivīdu blīvumu parauglaukumos. Veģetācijas struktūrai netika atrasta…
Female control of paternity in the sexually cannibalistic spider Argiope keyserlingi.
2000
Sexual conflict theory predicts an antagonistic coevolution, with each sex evolving adaptations and counter-adaptations to overcome a temporary dominance of the other sex over the control of paternity. Polyandry allows sexual selection to operate after mating has commenced, with male and female interests competing for control of fertilization. There are numerous examples of male control of paternity, but few studies have unambiguously revealed female control. Attributing variance in paternity to females is often difficult since male and female influences cannot be separated unambiguously. However, we show that polyandrous female orb-web spiders Argiope keserlingi (Arancidae) control the pat…
A mate to die for? A model of conditional monogyny in cannibalistic spiders.
2012
Monogynous males in various species actively limit themselves to mating with a single female in their lifetime. Whereas previous models have considered monogyny as an obligate mating strategy, here we explore the potential of monogyny to evolve as a context-specific (conditional) behavior. Using a state-dependent dynamic game model based on the biology of the cannibalistic spider Argiope bruennichi, we confirm that conditional monogyny can evolve under broad conditions, including an even sex ratio. We predict that males should make a terminal investment when mating with large, virgin females, especially if population density is low and the encounter occurs late in the season. We encourage e…
A mate to die for? A model of conditional monogyny in cannibalistic spiders
2012
Monogynous males in various species actively limit themselves to mating with a single female in their lifetime. Whereas previous models have considered monogyny as an obligate mating strategy, here we explore the potential of monogyny to evolve as a context-specific (conditional) behavior. Using a state-dependent dynamic game model based on the biology of the cannibalistic spider Argiope bruennichi, we confirm that conditional monogyny can evolve under broad conditions, including an even sex ratio. We predict that males should make a terminal investment when mating with large, virgin females, especially if population density is low and the encounter occurs late in the season. We encourage e…