Asynchronous maturation of the sexes may limit close inbreeding in a subsocial spider

Bukowski, Todd C.; Avilés, Leticia

doi:10.1139/z01-220

Cited by 33 publications

(44 citation statements)

References 28 publications

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“…Females of the subsocial spider Anelosimus arizona (formerly A. cf. jucundus) delay their sexual receptivity, maximising foraging after moulting (Bukowski and Aviles 2002). A similar period of little tactochemical attractiveness in early adult period (1st week after last moult) was indicated by Roberts and Uetz (2005) for S. ocreata females.…”

Section: Discussionmentioning

confidence: 78%

Changes in male sexual responses from silk cues of females at different reproductive states in the wolf spider Schizocosa malitiosa

Baruffaldi

Costa

2009

J Ethol

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Male wolf spiders are capable of recognising sexual signals associated with female silk threads. In the wolf spider Schizocosa malitiosa variations in female receptivity have been studied, but changes in female silk attractiveness remain unknown. We analysed the sexual responses of adult males (leg shaking, papal drumming and searching) exposed to silk cues from subadult, virgin and mated females of different ages, and females that were or were not carrying an egg-sac. Penultimate and recently moulted adult females elicited low levels of male sexual behaviour, while those of virgin females (21-40 days old) were the most attractive. Silk threads slowly became less attractive after mating. Cues from females carrying an eggsac as well as females in the inter egg-sac period were fairly attractive. The low attractiveness of recently moulted females disagrees with their high sexual receptivity. In contrast, females continued to elicit strong male responses during a 10-day period after mating, despite the fact that they immediately become sexually reluctant, suggesting strong selection for male searching ability. Low attractiveness during the egg-carrying period could reflect the fact that females do not require any further sperm. Concordances and discordances between attractiveness and sexual receptivity suggest that they respond to different physiological mechanisms.

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Section: Discussionmentioning

confidence: 78%

Changes in male sexual responses from silk cues of females at different reproductive states in the wolf spider Schizocosa malitiosa

Baruffaldi

Costa

2009

J Ethol

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“…We suggest that natal dispersal in this species primarily reflects competition for resources within the natal nest and that inbreeding avoidance, if present, is accomplished through alternative mean such as differences in maturation dates between sibling males and females combined with later movements of one or both sexes (Bukowski & Avile´s 2002). Anelosimus cf.…”

Section: Discussionmentioning

confidence: 91%

“…jucundus is morphologically close, but not identical to Anelosimus jucundus (O. P. Cambridge 1986), a subsocial species described from montane areas in Costa Rica, Panama, and Ecuador (Levi 1956(Levi , 1963I. jucundus in sourthern Arizona has been described in detail by Avile´s & Gelsey (1998); see also Bukowski & Avile´s 2002). comm.).…”

Section: Study Speciesmentioning

confidence: 99%

Natal Dispersal Patterns of a Subsocial Spider Anelosimus cf. jucundus (Theridiidae)

Powers

Avilés

2003

Ethology

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Species that alternate periods of solitary and social living may provide clues to the conditions that favor sociality. Social spiders probably originated from subsocial‐like ancestors, species in which siblings remain together for part of their life cycle but disperse prior to mating. Exploring the factors that lead to dispersal in subsocial species, but allow the development of large multigenerational colonies in social species, may provide insight into this transition. We studied the natal dispersal patterns of a subsocial spider, Anelosimus cf. jucundus, in Southeastern Arizona. In this population, spiders disperse from their natal nests in their penultimate and antepenultimate instars over a 3‐mo period. We tracked the natal dispersal of marked spiders at sites with clustered vs. isolated nests. We found that most spiders initially dispersed less than 5 m from their natal nests. Males and females, and spiders in patches with different densities of nests, dispersed similar distances. The fact that both sexes in a group dispersed, the lack of a sex difference in dispersal distance, and the relatively short distances dispersed are consistent with the hypothesis that natal dispersal results from resource competition within the natal nest, rather than inbreeding avoidance in competition for mates. Additionally, an increase in the average distance dispersed with time and with the number of spiders leaving a nest suggests that competition for nest sites in the vicinity of the natal nest may affect dispersal distances. The similar distances dispersed in patches with isolated vs. clustered nests, in contrast, suggest that competition among dispersers from different nests may not affect dispersal distances.

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“…Because patch mates may consist of siblings (Lubin et al 1998, Johannesen and Lubin 1999, emigration would reduce the likelihood of mating with kin. Bukowski and Avilés (2002) suggested that asynchrony in maturation between sexes may limit inbreeding and also explain an apparent lack of discrimination of kin as mates in another subsocial spider, Anelosimus jucundus (Theridiidae). Dispersal patterns of A. jucundus were similar to S. lineatus, because a fraction of males were philopatric and mated locally whereas other males emigrated beyond the local area (Avilés and Gelsey 1998).…”

Section: Polyandry Protandry and Inbreeding Avoidancementioning

confidence: 99%

The Transition to Social Inbred Mating Systems in Spiders: Role of Inbreeding Tolerance in a Subsocial Predecessor

Bilde

Lubin

Smith³

et al. 2005

Evolution

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Abstract. The social spiders are unusual among cooperatively breeding animals in being highly inbred. In contrast, most other social organisms are outbred owing to inbreeding avoidance mechanisms. The social spiders appear to originate from solitary subsocial ancestors, implying a transition from outbreeding to inbreeding mating systems. Such a transition may be constrained by inbreeding avoidance tactics or fitness loss due to inbreeding depression. We examined whether the mating system of a subsocial spider, in a genus with three social congeners, is likely to facilitate or hinder the transition to inbreeding social systems. Populations of subsocial Stegodyphus lineatus are substructured and spiders occur in patches, which may consist of kin groups. We investigated whether male mating dispersal prevents matings within kin groups in natural populations. Approximately half of the marked males that were recovered made short moves (Ͻ 5m) and mated within their natal patch. This potential for inbreeding was counterbalanced by a relatively high proportion of immigrant males. In mating experiments, we tested whether inbreeding actually results in lower offspring fitness. Two levels of inbreeding were tested: full sibling versus non-sib matings and matings of individuals within and between naturally occurring patches of spiders. Neither full siblings nor patch mates were discriminated against as mates. Sibling matings had no effect on direct fitness traits such as fecundity, hatching success, time to hatching and survival of the offspring, but negatively affected offspring growth rates and adult body size of both males and females. Neither direct nor indirect fitness measures differed significantly between within patch and between-patch pairs. We tested the relatedness between patch mates and nonpatch mates using DNA fingerprinting (TE-AFLP). Kinship explained 30% of the genetic variation among patches, confirming that patches are often composed of kin. Overall, we found limited male dispersal, lack of kin discrimination, and tolerance to low levels of inbreeding. These results suggest a history of inbreeding which may reduce the frequency of deleterious recessive alleles in the population and promote the evolution of inbreeding tolerance. It is likely that the lack of inbreeding avoidance in subsocial predecessors has facilitated the transition to regular inbreeding social systems.

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Asynchronous maturation of the sexes may limit close inbreeding in a subsocial spider

Cited by 33 publications

References 28 publications

Changes in male sexual responses from silk cues of females at different reproductive states in the wolf spider Schizocosa malitiosa

Changes in male sexual responses from silk cues of females at different reproductive states in the wolf spider Schizocosa malitiosa

Natal Dispersal Patterns of a Subsocial Spider Anelosimus cf. jucundus (Theridiidae)

The Transition to Social Inbred Mating Systems in Spiders: Role of Inbreeding Tolerance in a Subsocial Predecessor

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