Reversed cannibalism, foraging, and surface activities of Allocosa alticeps and Allocosa brasiliensis: two wolf spiders from coastal sand dunes

  title={Reversed cannibalism, foraging, and surface activities of Allocosa alticeps and Allocosa brasiliensis: two wolf spiders from coastal sand dunes},
  author={Anita Aisenberg and Macarena Gonz{\'a}lez and Alvaro Laborda and Rodrigo Postiglioni and Miguel Sim{\'o}},
Abstract Environments where prey availability is scarce or highly variable have been reported as potential settings for the occurrence of paternal investment and sex-role reversal (choosy males and competitive, courting females). Allocosa brasiliensis (Petrunkevitch 1910) and Allocosa alticeps (Mello-Leitão 1944) are two sand-dwelling wolf spiders that construct burrows along the Uruguayan coastline. Both species present a reversal in typical sex roles and size dimorphism. In the present study… 

Dispersal Strategies, Genetic Diversity, and Distribution of Two Wolf Spiders (Araneae, Lycosidae): Potential Bio-Indicators of Ecosystem Health of Coastal Dune Habitats of South America

Dispersal strategies are essential for species survival. Animals need to move to search for food, to locate potential sexual partners, to find refuge and escape from predators, and to avoid

Flying sand-dwelling spiders: aerial dispersal in Allocosa marindia and Allocosa senex (Araneae: Lycosidae)

The possibility that microhabitat conditions could affect ballooning propensity particularly in the three coastal wolf spiders is discussed, and the occurrences of pre-ballooning behaviors varied both within and among species.

Habitat Preference and Effects of Coastal Fragmentation in the Sand-Dwelling Spider Allocosa brasiliensis (Lycosidae, Allocosinae)

The most fragmented beaches showed lower number of burrows and individuals, especially in immatures stages, and the most suitable sandy habitat for A. brasiliensis should present a vegetation cover optimum of 25% - 50% of the surface.

Influence of prey availability on seasonal fluctuation in body condition in the wolf spider, Pardosa milvina (Araneae: Lycosidae)

Although the availability of potential prey generally increased over the growing season, changes in body condition fluctuated independently of prey, suggesting that Pardosa milvina have life history differences in foraging and demand for resources that may influence foraging decisions.

Female and Juvenile Burrow Digging in Allocosa brasiliensis, a South American Sand-Dwelling Wolf Spider

Burrow digging was stereotyped both in females and juveniles, following a sequence of behavioural units repeated in a cycle, and variations in burrow digging behaviour and final burrow dimensions would reflect differences in strategies according to sex and stage.

Spider hawk in sand dunes: Anoplius bicinctus (Hymenoptera: Pompilidae), a parasitoid wasp of the sex-role reversed spider Allocosa brasiliensis (Araneae: Lycosidae)

Two distinct behaviors of carrying the spider were found that were dependent of wasp size and were maintained during the transport process, suggesting more efficient defenses against wasp attacks in this sex.

Hunger and territorial-dependent cannibalism in females of a South American species of wolf spider (Araneae: Lycosidae)

The first report of hunger and territorial-dependent cannibalism in Lycosa poliostoma (Lycosidae), an abundant wolf spider in the grasslands of Argentina and Uruguay is provided, generating new questions on the role of cannibalisms in its trophic ecology as well as on its potential use as a biological control of pests.

Male mate choice in Allocosa alticeps (Araneae: Lycosidae), a sand-dwelling spider with sex role reversal

The results suggest male mate selectivity in A. alticeps is based on female reproductive status, and possible mechanisms underlying male mate choice in this species are discussed.

Sexual dimorphism in chelicerae, forelegs and palpal traits in two burrowing wolf spiders (Araneae: Lycosidae) with sex-role reversal

The occurrence of differences in morphological traits related to sex roles in both Allocosa species and the results with two non-burrowing wolf spiders with typical sex roles are explored.



Dietary and prey-capture adaptations by which Zodarion germanicum, an ant-eating spider (Araneae: Zodariidae), specialises on the Formicinae

Evidence is provided that Zodarion germanicum is a spider that has dietary and venom adaptations by which it targets a particular subset of ants, the subfamily Formicinae, and the findings suggest that the spider’s venom is especially effective against formicines.

Reproductive isolation and sex-role reversal in two sympatric sand-dwelling wolf spiders of the genus Allocosa

Data is compared on development and morphology and reproductive isolation between morphs of A. brasiliensis to test the hypotheses that the two morphs are reproductively isolated and both show courtship-role reversal.

Daring females, devoted males, and reversed sexual size dimorphism in the sand-dwelling spider Allocosa brasiliensis (Araneae, Lycosidae)

Findings on the sand-dwelling wolf spider, Allocosa brasiliensis, prove a reversal in typical courtship roles reported for the first time in spiders, turning it as a promising model for discussing the determinants of sex roles and the pressures that drive their evolution and maintenance.


Study spiders turned out to be ant specialists as they were able to subdue many ant species but ignored all other insects, except termites, which they attacked but rarely subdued.


Adult females of the Mediterranean tarantula are territorial, and cannibalism may be a consequence of territorial defense.

Cannibalism Regulates Densities of Young Wolf Spiders: Evidence From Field and Laboratory Experiments

The results of field and laboratory experiments lead to the conclusion that cannibalism can act as a strong DD mortality factor for young instars of S. ocreata, with the potential to regulate densities of this abundant cursorial spider.

Mating patterns in late-maturing female Mediterranean tarantulas may reflect the costs and benefits of sexual cannibalism

The later a female matured, the shorter was her cohabitation time with males and the lower her probability of cohabiting with a male at all, suggesting that late-maturing females may be limited in their access to males as mates, and females had higher mating success if they were smaller or in better condition (better fed).

Biogeography and conservation biology of Florida's Geolycosa wolf spiders: threatened spiders in endangered ecosystems

Geolycosa wolf spiders tend to occur in species pairs which use different microhabitats: those which burrow in areas covered in leaf litter, and those which use only barren sites, which require habitat management plans that include burns.

The ecological determinants of space use by a burrowing wolf spider in a xeric shrubland ecosystem

Abstract The patterns of dispersion and habitat associations of a burrowing wolf spider were examined in a xeric shrubland ecosystem in central Florida, U.S.A. Geostatistical analyses of habitat

Sexual Cannibalism in Orb-Weaving Spiders: An Economic Model

The model demonstrates that cannibalism of courting males by virgin females can arise purely through foraging considerations and that the most important factors for the evolution of this behavior are the expected number of males encountered during the season and the distribution of mass gained from other prey items.