The effect of heather fragmentation and mixed grazing on the diet of sheep Ovis aries and red deer Cervus elaphus

• Autorzy: Cuartas P. , Gordon I.J. , Hester A.J. , Perez-Barberia F.J. , Hulbert J.A.R.
• Języki publikacji: EN

Abstrakty

EN

The effects of vegetation fragmentation and mixed grazing (ie mono- or multi-species animal group) on the diet composition of sheep and red deer grazing mosaics of grassland and heather moorland was studied, using faecal cuticle analysis, in two experimental sites in Scotland during the summer of 1992 and 1993. On Site A, the influence of grassland fragmentation on diet composition was estimated for sheep and deer grazing together in plots where the grassland (20% of the area) was artificially distributed as one large, four medium or twelve small patches within a homogeneous moorland matrix (80% of the area). On Site B, differences in diet composition between animals grazing within mono-species (sheep or deer) and multi-species groups (sheep and deer together) were examined for each animal species. In this site all plots used contained a similar natural mosaic pattern of grass and heather (ie similar mixtures of patch sizes, with about 20% grass and 80% heather cover). On Site A, the proportions of grass in the diet of sheep (73%) and deer (27%) were found to be similar across all levels of grass fragmentation. A significant interaction was found between the pattern of fragmentation and the three periods in which the experiment was carried out. On Site B in 1992, sheep had more grass in their diet than did deer (52% vs 46%), and the diets of both sheep and deer responded in the same fashion when the species were grazing in mono- or multi-species groups, The consumption of grass decreased in both species throughout the period studied. Deer showed no change in the proportion of grass in their diet in the presence or absence of sheep in 1992 (deer 48% vs sheep 50%). But on Site B in 1993, the diet of sheep contained a significantly higher proportion of grasses when they were grazing with red deer (52%) than when they were grazing alone (38%). These results suggest that on grassland/heather moorland mosaics sheep may suffer intraspecies competition to a greater extent than do red deer, particularly where grass is in relatively low supply,

Słowa kluczowe

EN

Ovis aries; red deer; vegetation fragmentation; grassland; sheep; competition; diet; Cervus elaphus; mixed grazing; fecal analysis; diet composition; deer; grass

• Wydawca: -
• Czasopismo: Acta Theriologica
• Rocznik: 2000
• Tom: 45
• Numer: 3
• Opis fizyczny: p.309-320

Twórcy

autor

Cuartas P.

• Instituto Pirenaico de Ecologia, Apdo 64, 22700, Jaca, Spain

autor

Gordon I.J.

autor

Hester A.J.

autor

Perez-Barberia F.J.

autor

Hulbert J.A.R.

Bibliografia

• Armstrong H. M., Gordon I. J., Sibbald A. R., Grant S. A., Hutchings N. J. and Milne J. A. 1997. A model of grazing by sheep on hill systems in the U.K. I. The prediction of vegetation biomass. Journal of Applied Ecology 34: 166-185.
• Armstrong R. H., Common T, G. and Smith H. K. 1986. The voluntary intake and in uiuo digestibility of herbage harvested from indigenous hill plant communnities. Grass and Forage Science 41: 53-60.
• Bartolomé T., Franch T., Gutman M. and Seligman N. G. 1995. Physical factors that influence fecal analysis estimates of herbivore diets. Journal of Range Management 48: 267-270.
• Bullock D. J. 1985. Annual diets of hill sheep and feral goats in southern Scotland. Juurnal of Applied Ecology 22: 423-433.
• Clarke J L., Welch D. and Gordon 1. J. 1995a. The influence of vegetation pattern on the grazing of heather moorland by red deer and sheep. I. The location of animals on grass/heather mosaics. Journal of Applied Ecology 32: 166-176.
• Clarke J. L., Welch D. and Gordon I J. 1995b. The influence of vegetation pattern on the grazing of heather moorland by red deer and sheep. II. The impact on heather. Journal of Applied Ecology 32: 177-186.
• Colquhoun I. R. 1970. The grazing ecology of red deer and blackface sheep in Perthshire, Scotland. PhD thesis, University of Edinburgh, Edinburgh, U.K.
• Demment M. W. 1982. The scaling of ruminoreticulum size with body-weight in East African ungulates. African Journal of Ecology 20: 43-47.
• Elston D. A., Illius A. W. and Gordon I. J, 1996. Assessment of preference among a range of options using log ratio analysis. Ecology 77: 2538-2548.
• Farnsworth K. D. and Illius A. W. 1998. Optimal diet choice for large herbivores: an extended contingency model. Functional Ecology 12: 74-81.
• Fraser M. D. and Gordon I. J. 1997. The diet of goats, red deer and South American camelids feeding on three contrasting Scottish upland vegetation communities. Journal of Applied Ecology 34: 668-686.
• Gerstat 5 Committee 1993. Genstat 5 release 3 reference manual. Clarendon Press, Oxford: 1-796.
• Gordon I. J. 1989. Vegetation community selection by ungulates on the Isle of Rhum. II. Vegetation community selection. Journal of Applied Ecology 26: 53-64.
• Gordon I. J. and Illius A. W. 1989. Resource partitioning by ungulates on the Isle of Rhum. Oecologia 79: 383-389.
• Gwynne M. D. and Bell R. H. V. 1968. Selection of vegetation components by grazing ungulates in the Serengeti National Park. Nature 220: 390-393.
• Hester A. J. and Baillie G. J. 1998. Spatial and temporal patterns of heather use by sheep and red deer within natural heather/grass mosaics. Journal of Applied Ecology 35: 772-784.
• Hester A. J., Gordon I. J., Baillie G. J. and Tappin E. 1999. Foraging behaviour of sheep and red deer within natural heather grass mosaics. Journal of Applied Ecology 36: 133-146.
• Hofmann R. R. 1989. Evolutionary steps of ecophysiological adaptation and diversification of ruminants: a comparative view of their digestive system. Oecologia 78: 443-457.
• Holechek J. L. 1982. Sample preparation technique for microhistological analysis. Journal of Range Management 35: 267-268.
• Holechek J L. and Gross B. 1982. Training needed for quantifying simulated diets from fragmented range plants. Journal of Range Management 35: 644-647.
• Iliius A. W. and Gordon I. J. 1987. The allometry of food intake in grazing ruminants. Journal of Animal Ecology 56: 989-999.
• Jarman P. J. 1974. The social organisation of antelope in relation to their ecology. Behaviour 48: 215-266.
• Jarman P. J. and Sinclair A. R. E. 1979. Feeding strategy and the pattern of resource partitioning in ungulates, tin: Serengeti: dynamics of an ecosystem, A. R, E. Sinclair and M. Norton-Griffiths, eds], University of Chicago Press, Chicago: 130-163.
• Lawes Agricultural Trust. 1993. Genstat 5 release 3 reference manual. Oxford University Press, Oxford: 1-796.
• Martin P. and Bateson P. 1993. Measuring behaviour: An introductory guide. 2nd edition. Cambridge University Press, Cambridge: 1-222.
• McNaughton S. J. 1991. Evolutionary ecology of large tropical herbivores. [In: Plant-animal interactions: Evolutionary ecology in tropical and temperate regions. P. W. Price, T. M. Lewinsohn, G. W. Fernandes and W, W. Benson, eds]. John Wiley & Sons, Inc., New York: 509-520.
• Milne J. A. and Grant S. A. 1987. Sheep management on heather moorland. [In: Efficient Sheep Production. Occasional Symposium of the British Grassland Society No 21. G. E. Pollott, edl. The Lavenham Press, Lavenham, Suffolk: 165-167.
• Milne J. A., Macrae J. C., Spence A. M. and Wilson S. 1978. A comparison of the voluntary intake and digestion of a range of forages at different times of Lhe year by the sheep and the red deer Cervus elaphus. British Journal of Nutrition 40: 347-356.
• Osborne B. C. 1984. Habitat use by red deer (Cervus elaphus L.) and hill sheep in the West Highlands. Journal of Applied Ecology 21: 497-506.
• Rabbins C. T., Mole S., Hagermann A. E. and Hanley R. T. 1987. Role of tannins in defending plants against ruminants: reduction in dry matter digestibility? Ecology 68: 1606-1615.
• Senft R. L., Coughenour M. B., Bailey D. W., Rittenhouse L. R., Sala O. E. and Swifi D. M. 1987. Large herbivore foraging and ecological hierarchies. Bioscience 37: 789-799.
• Spalinger D. A. and Hobbs N. T. 1992. Mechanisms of foraging in mammalian herbivores: new models of functional response. The American Naturalist 140: 325-348.
• Sparks D. R. and Malechek J. C. 1968. Estimating percentage dry weight in diets using a microscope technique. Journal of Range Management 21: 264-265.
• Sydes C. and Miller R. 1988. Range management and nature conservation in the Brithis Uplands. | In: Ecological change in the uplands. M. B. Usher and D. B. A. Thompson, eds], British Ecological Society, Special Publication Series No 7: 323-337.
• Van Soest P. J. 1996. Allometry and ecology of feeding-behavior and digestive capacity in herbivores - a review. Zoo Biology 15: 455-479.
• Welch D. 1984. Studies in the grazing of heather moorland in north-east Scotland. I. Site descriptions and patterns of utilization. Journal of Applied Ecology 21: 179-195.
• Wiens J. A. 1985. Vertebrate responses to environment patchiness in arid and semi-arid ecosystems. Lin: The ecology of natural disturbance and patch dynamic. S. T. A. Pickett and P. S. White, eds]. Academic Press, London, New York: 169-192.