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Tactics of reproduction and reproductive allocation in four species of woodlice from southern Africa

Published online by Cambridge University Press:  10 July 2009

J. Mark Dangerfield
Affiliation:
Department of Biological Sciences, University of Botswana, Private Bag 0022, Gaborone, Botswana
S. R. Telford
Affiliation:
Zoology Department, University of Pretoria, Pretoria 0002, South Africa

Abstract

Measurements of reproductive allocation, fertility and iteroparity were made on females of four species of woodlice (Isopoda: Oniscidae) from southern Africa. In three of the species between-population comparisons were made. The average body mass of reproductive females was smaller than in temperate woodlice and because of a positive scaling between body mass and fertility: brood sizes were rarely larger than 30 young and usually between 5 and 20. Reproductive allocation ranged from 16 to 27% of female pre-birth live mass and differed significantly between species. Associations between reproductive allocation and body mass were all positive although only significant in two of the populations. A small number of females produced more than one brood during the study and iteroparity appears the most likely reproductive tactic in these species.

In woodlice a restriction on body size results in lower fecundity as brood size is ultimately determined by the size of the marsupium. It is postulated that a tactic of repeated reproduction, with a relatively conservative allocation of resources to each reproductive event to enhance survival probabilities, would be favoured, particularly in an environment where juvenile mortality and the chance of complete brood failure is high.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1995

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References

LITERATURE CITED

Brody, M. S. & Lawlor, L. R. 1984. Adaptive variation in offspring size in the terrestrial isopod Armadillidium vulgare. Oecologia 61:5559.CrossRefGoogle ScholarPubMed
Dangerfield, J. M. & Hassall, M. 1992. Phenotypic variation in the breeding phenology of the woodlouse Armadillidium vulgare. Oecologia 89:140146.CrossRefGoogle ScholarPubMed
Dangerfield, J. M., Milner, A. E. & Matthews, R. 1993. Seasonal activity patterns and behaviour of juliform millipedes in south-eastern Botswana. Journal of Tropical Ecology 8:451464.CrossRefGoogle Scholar
Dangerfield, J. M. & Telford, S. R. 1990. Breeding phenology, variation in reproductive effort and offspring size in a tropical population of the woodlouse Porcellionides pruinosus. Oecologia 82:251258.CrossRefGoogle Scholar
Dangerfield, J. M. & Telford, S. R. 1991. Distribution patterns of Aphiloscia maculicornis Budde-Lund (Crustacea, Oniscidae) in a moist tropical forest above Victoria Falls, Zimbabwe. Pp. 5763 in Juchault, P. & Mocquard, J. P. (eds). The biology of terrestrial isopods III. Proceedings of the third international symposium on the biology of terrestrial isopods. Université de Poitiers, France.Google Scholar
Dangerfield, J. M. & Telford, S. R. 1992. Species diversity of Julid millipedes: between habitat comparisons within the seasonal tropics. Pedobiologia 36:321329.CrossRefGoogle Scholar
Dangerfield, J. M. & Telford, S. R. In press a. Reproduction in woodlice: flexibility to maximise individual fitness. Crustacean Issues.Google Scholar
Dangerfield, J. M. & Telford, S. R. In press b. Offspring growth and survivorship in the woodlouse Porcellionides pruinosus. Ethology, Ecology & Evolution.Google Scholar
Davis, R. C. 1978. Ecological studies of Isopoda and Diplopoda in dune grassland. PhD Thesis, University of Leeds.Google Scholar
Davis, R. C. 1984. Effects of weather and habitat structure on the population dynamics of isopods in a dune grassland. Oikos 42:387395.CrossRefGoogle Scholar
Edney, E. B. 1954. Woodlice and the land habitat. Biological Reviews 29:185219.CrossRefGoogle Scholar
Ferrara, F. & Taiti, S. 1979. A check-list of Terrestrial Isopods from Africa (south of the Sahara). Monitore zoologico italiano 10:89215.CrossRefGoogle Scholar
Jassem, W., Mocquard, J.-P. & Juchault, P. J. 1982. Déterminisme de la reproduction saisonnière des femelles d'Armadillidium vulgare Latreille. IV. Contribution à photopériodique induisant l'entrée en reproduction: mode des discrimination entre le jour et la nuit: longueurs d'onde activités. Annales des Sciences Naturelles, Zoologie, Paris. 13 Série 4:8590.Google Scholar
Linsenmair, K. E. 1984. Comparative studies on the social behaviour of the desert woodlouse Hemilepistus reaumuri: adaptations to ecological and physiological problems. Symposium of the Zoological Society of London 53:423454.Google Scholar
Linsenmair, K. E. 1990. Sex-specific reproductive patterns in some terrestrial isopods. Pp. 1947 in Rasa, A. E., Vogel, C. & Voland, E. (eds). The sociobiology of sexual and reproductive strategies. Chapman & Hall, London.Google Scholar
Ma, H. H. T., Dudgeon, D. & Lam, P. K. S. 1991a. Seasonal changes in populations of three sympatric isopods in a Hong Kong forest. Journal of Zoology (London) 224:347365.CrossRefGoogle Scholar
Ma, H. H. T., Lam, P. K. S. & Dudgeon, D. 1991b. Inter- and intraspecific variation in the life histories of three sympatric isopods in a Hong Kong forest. Journal of Zoology (London) 224:667687.Google Scholar
Nair, G. A. 1984. Breeding and population biology of the terrestrial isopod Porcellio laevis (Latreille) in the Delhi region. Symposium of the Zoological Society of London 53:315338.Google Scholar
Paris, O. H. 1963. The ecology of Armadillidium vulgare in California grassland: food, enemies and weather. Ecological Monographs 33:122.CrossRefGoogle Scholar
Schmalfuss, H. 1984. Eco-morphological strategies of terrestrial isopods. Symposium of the Zoological Society of London 53:4964.Google Scholar
Sunderland, K. D., Hassall, M. & Sutton, S. L. 1976. The population dynamics of Philoscia muscorum (Crustacea, Oniscoidea) in a dune grassland ecosystem. Journal of Animal Ecology 45:487506.CrossRefGoogle Scholar
Sutton, S. L., Hassall, M., Willows, R., Davis, R. C., Grundy, A. & Sunderland, K. D. 1984. Life histories of terrestrial isopods. Symposium of the Zoological Society of London 53:269294.Google Scholar
Warburg, M. R. 1987. Isopods and their terrestrial environment. Advances in Ecological Research 17:187242.CrossRefGoogle Scholar
Warburg, M. R. & Cohen, N. 1992. Reproductive pattern, allocation and potential of an iteroparous isopod from a xeric habitat in the Mediterranean region. Journal of Arid Environments 22:161171.CrossRefGoogle Scholar
Warburg, M. R., Linsenmair, K. E. & Bercovitz, K. 1984. The effect of climate on the distribution and abundance of isopods. Symposium of the Zoological Society of London 53:339368.Google Scholar
Williams, T. R. & Franks, N. R. 1988. Population size and growth rate, sex ratio and behaviour in the ant isopod Platyarthrus hoffmannseggi. Journal of Zoology (London) 215:703717.CrossRefGoogle Scholar
Willows, R. 1984. Breeding phenology of woodlice and oostegite development in Ligia oceanica (L.) (Crustacea). Symposium of the Zoological Society of London 53:469485.Google Scholar