Maria João Maia*1, Francisco Rego** and Francisco Sousa Machado***
*Degree in Project Management and Rural Areas
***Forest Engineer
ERENA, Ordenamento e Gestão dos Recursos Naturais, Av. Visconde Valmor, 11-3º, 1000-289 LISBOA
**Associate Professor
Instituto Superior de Agronomia. CEABN, Centro de Ecologia Aplicada Prof. Baeta Neves, Tapada da Ajuda, 1349-018 LISBOA
Abstract. Studies on red deer feeding ecology have been conducted in Portugal for several years and in various locations using microhistological techniques on feces. These analyses are extremely time consuming requiring the optimization of the multistage sampling scheme used. Estimates of variance components based on samples from red deer pellets in Vila Viçosa (southern Portugal) indicate that variability among individual pellets of the same pellet group is minimal. It is concluded that using 100 plant fragments observed per pellet, a minimum number of 4 pellet groups provides a reasonable compromise between precision and cost.
]]> Key words: red deer; microhistological analysis; sampling; diet
Sumário. Nos últimos anos têm-se vindo a realizar em Portugal diversos estudos sobre a ecologia alimentar do veado com o recurso à utilização da análise micro-histológica de fezes. Estas análises exigem enorme consumo de tempo, pelo que interessa optimizar os esquemas de amostragem a múltiplos níveis geralmente utilizados. Baseados em amostras fecais de veado em Vila Viçosa (no Sul de Portugal) as estimativas das componentes de variância indicam uma variação mínima entre os diversos elementos constituintes do mesmo grupo fecal. Conclui-se que, com a identificação de 100 fragmentos epidérmicos por cada elemento do grupo fecal, é necessário um mínimo de 4 grupos para atingir um compromisso razoável entre precisão e custo.
Palavras-chave: veado; análise micro-histológica; amostragem; dieta
Résumé. Pendant les dernières années plusieurs études ont été réalisées au Portugal sur l'écologie alimentaire du cerf à l'aide de l'analyse micro-histologique de fèce. Ces analyses exigent énormément de temps d'où l'interêt d'optimiser des schémas d'échantillonage généralement utilisés à plusieurs niveaux. Basées sur les échantillon fécaux du cerf à Vila Viçosa (dans le sud du Portugal), les estimations des composantes de variance indiquent une variation minimum parmi les divers éléments constituants du groupe fécal. On conclu que, avec l'identification de 100 fragment épidermiques pour chaque élément du groupe fécal un minimum de 4 groupes est nécessaire pour atteindre un compromis raisonnable entre la précision et le coût.
Mots clés: cerf; analyse micro-histologique; échantillonage; alimentation.
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ALVAREZ, G., 1990. El uso del cereal por las poplaciones de cervidos (Cervus elaphus, Dama dama, Capreolus capreolus) en una finca cinegetica mediterranea. Ecologia 4 : 159-169. [ Links ]
Anthony, R., Smith, N., 1974. Comparison of rumen and fecal analysis to describe deer diets. J. Wild. Manag. 38(3) : 535-540. [ Links ]
Alipayo, D., Valdez, R., Holechek, J., Cardenas, M., 1992. Evaluation of microhistological analysis for determining botanical composition. J. Rang. Manag. 45 : 148-152. [ Links ]
Baker, R., 1986. An investigation into the accuracy of herbivore diet analysis. Aust. Wildl. Res. 13 : 559-568. [ Links ]
Bartolomé, J., Franch, J., Gutman, M., Seligman, A., 1995. Technical note: Physical factors influence fecal analysis estimates of herbivores. J. Rang. Manag. 48 : 267-270. [ Links ]
Baumgartner, L., Martin, A., 1939. Plant histology as an aid in squ irrel food studies. J. Wildl. Manag. 3 : 266-268. [ Links ]
BPTRR., 1962. Basic Problems and Techniques in Range Research. Publ.890 Nat. Acad. of Sc. Nat. Res. Council, Washington. 342pp. [ Links ]
Chapuis, J., 1980. Méthodes d'étude du regime alimentaire du lapin de garenne, Oryctolagus cuniculus L. par l'analyse micrographique des feces. Rev. Ecol. (Terre Vie), 34(11) : 571-585. [ Links ]
COCHRAM, W., 1977. Sampling techniques. John Wiley and Sons, New york. [ Links ]
DAVITT, B., NELSON, J., 1980. A method of preparing plant epidermal tissue for use in fecal analysis. Col. of Agric. Res. Center, Washington State Uni. Circular 0628, 4pp. [ Links ]
Elliott III, H., Barrett, R., 1985. Dietary overlap among axis, fallow, and black-tailed deer and cattle. J. Rang. Manag. 38(6) : 546-550. [ Links ]
ERENA/ISA., 1997. Bases para o ordenamento do veado (Cervus elaphus L.) em Portugal. Relatório técnico-científico. Projecto STRIDE/0037. JNICT, 472pp. [ Links ]
FITZERALD, A., WADDINGTON, D., 1979. Comparison of two methods of fecal analysis of herbivore diet. J. Wildl. Manag. 43 : 468-473. [ Links ]
Fraser, M., Gordon, I., 1997. The diet of goats, red deer and South American camelids feeding on contrasting Scottish upland vegetation communities. J. Appl. Ecol. 34 : 668-686. [ Links ]
Garcia-Gonzalez, R., Cuartas, P., 1989. A comparison of the diets of the wild goat (Capra pyrenaica), domestic goat (Capra hircus), mouflon (Ovis musimon) and domestic sheep (Ovis aries) in the Cazorla Mountain range. Acta Biol.Mont. (IX) : 123-132. [ Links ]
Garcia-Gonzalez, R., Cuartas, P., 1992. Food habits of Capra pyrenaica, Cervus elaphus and Dama dama in the Cazorla Sierra (Spain). Mammalia 56(2) : 195-202. [ Links ]
GRENN, M., 1987. Diet composition and quality in himalayan musk deer based on fecal analysis. J. Wildl. Manag. 51(4) : 880-892. [ Links ]
HANSEN, R., FOPPE, T., GILBERT, M., CLARK, R., REYNOLDS, H., 1978. The microhistological analysis of faeces as an estimator of herbivore dietary. Composition Analysis Lab. Rang. Sc. Colorado State Uni., Fort Collins, Colorado, 4pp. [ Links ]
Holechek, J., VAVRA, M., PIEPER, R., 1982. Botanical composition determination of range herbivore diets: a review. J. Rang. Manag. 35(3) : 309-315. [ Links ]
HOSEY, G.R., 1981. Annual foods of the Roe deer (Capreolus capreolus) in the south England. J. Zool. Lond. 194 : 276-278. [ Links ]
MAIA, M., REGO, F., FONSECA, M., BUGALHO, J., 1996. Dieta de uma população de veados (Cervus elaphus L.) durante o período de reprodução: análise micro-histológica das fezes. Rev. Florestal 9(1) : 277-286. [ Links ]
MAISELS, F., 1988. The feeding ecology of the Cyprus Mouflon Ovis orientalis, Gmelin 1774, in the Paphos Forest, Cyprus. PhD Thesis, Univ. Edinburgh. [ Links ]
METCALFE, C., 1960. Anatomy of the Monocotyledons. I. Gramineae. Clarendon Press, Oxford, 731pp. [ Links ]
METCALFE, C., CHALK, L., 1965. Anatomy of the Dicotyledons. Clarendon Press, Oxford, 2 tomes. [ Links ]
NATIONAL ACADEMY OF SCIENCES, 1962. Range Research. Basic Problems and Techniques. Nat. Acad. Sci., Nat. Res. Council Pub 890. Washington, D.C. [ Links ]
SCOTT, G., DAHL, B., 1980. Key to selected plant species of Texas using plant fragments. Ocas. Pap. the Museum Texas Tech. Univ. 64, 37pp. [ Links ]
SHERLOCK, M., FAIRLEY, J., 1993. Seasonal changes in diet of red deer Cervus elaphus in Connemara National Park. Proc. of the Royal Irish Aca. 93B(2) : 85-90. [ Links ]
STEEL, R., TORRIE, J., 1980. Principles and procedures of statistics a biometrical approach. 2nd Ed. McGraw Hill, 633pp. [ Links ]
SPARKS, D., MALECHEK, J., 1968. Estimating percentage dry weight in diets using a microscopic technique. J. Range Manage. 21 : 264-265. [ Links ]
STEEL, TORRIE, 1980. Principles and procedures of statistics. McGraw-Hill, New York. 481pp. [ Links ]
STEWART, D., 1967. Analysis of plant epidermis in faeces: a technique for studying the food preferences of grazing herbivores. J Appl. Ecol. 4 : 83-111. [ Links ]
Stewart, D., Stewart, J., 1970. Food preference data by faecal analysis for african plains ungulates. Zool. Afric. 15(1) : 115-129. [ Links ]
STORR, G., 1961. Microscopic analysis of faeces, a technique for ascertaining the diet of herbivorous mammals. Aust. J. Biol. Sci. 14 : 157-164. [ Links ]
TODD, J., HANSEN, R., 1973. Plant fragments in the faeces of bighorns as indicators of food habits. J. Wildl. Manag. 37 : 363-366. [ Links ]
ZYZNAR, E., URNESS, P., 1969. Qualitative identification of forage remnants in deer faeces. J. Wildl. Manag. 33 : 506-510. [ Links ]
(Submetido para publicação em Janeiro de 2001)
]]> (Aceite para publicação em Dezembro de 2001)
1 Corresponding Author E-mail: mjfmaia@clix.pt
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