Functional value of matriphagy in the spider Amaurobius ferox

Citation
Kw. Kim et al., Functional value of matriphagy in the spider Amaurobius ferox, ETHOLOGY, 106(8), 2000, pp. 729-742
Citations number
43
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Animal Sciences","Neurosciences & Behavoir
Journal title
ETHOLOGY
ISSN journal
0179-1613 → ACNP
Volume
106
Issue
8
Year of publication
2000
Pages
729 - 742
Database
ISI
SICI code
0179-1613(200008)106:8<729:FVOMIT>2.0.ZU;2-N
Abstract
The adaptive value of matriphagy, the consumption of the mother by her offs pring, in the sub-social spider Amaurobius ferox (Araneae, Amaurobiidae) wa s experimentally evaluated in terms of the benefits to the offspring and th e costs to the mother. Matriphagy resulted in a 2.5-fold weight gain in the offspring over their initial weight, advancement of their moulting time, a nd larger body mass at dispersal in comparison with clutches deprived of ma triphagy, but otherwise well provisioned with prey. Matriphagous offspring were also more successful at capturing large prey items, had a more extende d social period, and a higher survival rate at dispersal. Mothers separated from their broods just prior to matriphagy were able to produce second clu tches, effectively producing 33% more viable offspring (compared with the f irst clutches). However, the estimated reproductive outputs of the alternat ive maternal strategies (being devoted to the first clutch vs. deserting th e first and producing a second one) suggest that mothers of A. fever that a re cannibalized by their broods enjoy greater reproductive success than tho se that escape cannibalism and produce second clutches.