VonShipleyFesta-Bianchet2003

Référence

Von Hardenberg, A., Shipley, B., Festa-Bianchet, M. (2003) Another one bites the dust: Does incisor-arcade size affect mass gain and survival in grazing ungulates? Canadian Journal of Zoology, 81(9):1623-1629.

Résumé

Incisor-arcade size affects foraging efficiency in grazing ungulates and should be under strong selective pressure. We investigated individual variation in incisor-arcade size and its relationship with body mass and survival in bighorn sheep (Ovis canadensis) at Ram Mountain, Alberta, Canada, over 9 years. In adult ewes, incisor-arcade breadth and depth decreased with age, probably as a result of tooth wear. We found no effects of incisor-arcade size on survival of lambs or adult ewes. In adult ewes, an apparent positive effect of incisor-arcade size on survival disappeared when age was accounted for. Incisor-arcade breadth and depth had no effect on summer mass gain in lambs or adult ewes. Although linear models suggested that arcade breadth in lambs was correlated with summer mass gain, a latent variable path analysis model revealed that the correlation was due to an allometric relationship of arcade breadth with body size. Variation in incisor-arcade size in bighorn sheep appears to be due to individual variation in body size and age rather than to directional selection.

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@ARTICLE { VonShipleyFesta-Bianchet2003,
    AUTHOR = { Von Hardenberg, A. and Shipley, B. and Festa-Bianchet, M. },
    TITLE = { Another one bites the dust: Does incisor-arcade size affect mass gain and survival in grazing ungulates? },
    JOURNAL = { Canadian Journal of Zoology },
    YEAR = { 2003 },
    VOLUME = { 81 },
    PAGES = { 1623-1629 },
    NUMBER = { 9 },
    NOTE = { 00084301 (ISSN) Cited By (since 1996): 1 Export Date: 26 April 2007 Source: Scopus CODEN: CJZOA doi: 10.1139/z03-141 Language of Original Document: English Correspondence Address: Von Hardenberg, A.; Alpine Wildlife Research Center; Parco Nazionale Gran Paradiso; Via della Rocca, 47 I-10123, Torino, Italy; email: achaz.von.hardenberg@usherbrooke.ca References: Be?rube?, C., Festa-Bianchet, M., Jorgenson, J.T., Individual differences, longevity, and reproductive senescence in bighorn ewes (1999) Ecology, 80, pp. 2555-2565; Festa-Bianchet, M., Jorgenson, J.T., King, W.J., Smith, K.G., Wishart, W.D., The development of sexual dimorphism: Seasonal and lifetime mass changes of bighorn sheep (1996) Can. J. Zool., 74, pp. 330-342; Festa-Bianchet, M., Jorgenson, J.T., Be?rube?, C.H., Portier, C., Wishart, W.D., Body mass and survival of bighorn sheep (1997) Can. J. Zool., 75, pp. 1372-1379; Fraser, C.M., Bergeron, J.A., Mays, A., Aiello, S.E.E., (1991) The Merck Veterinary Manual. 7th Ed., , Merck \& Co., Inc., Rahway, N.J; Fryxell, J.M., Crease, T., Illius, A.W., Population cycles can maintain foraging polymorphism (1999) Proc. R. Soc. Lond. B Biol. Sci., 266, pp. 1277-1281; Gaillard, J.M., Festa-Bianchet, M., Delorme, D., Jorgenson, J.T., Body mass and individual fitness in female ungulates: Bigger is not always better (2000) Proc. R. Soc. Lond. B Biol. Sci., 267, pp. 471-477; Gibbs, H.L., Grant, P.R., Oscillating selection on Darwin's finches (1987) Nature, 327, pp. 511-513. , Lond; Gordon, I.J., Illius, A.W., Incisor arcade structure and diet selection in ruminants (1988) Funct. Ecol., 2, pp. 15-22; Gordon, I.J., Illius, A.W., Milne, J.D., Sources of variation in the foraging efficiency of grazing ruminants (1996) Funct. Ecol., 10, pp. 219-226; Hewison, A.J.M., Vincent, J.P., Angibault, J.M., Delorme, D., Van Laere, G., Gaillard, J.M., Tests of estimation of age from tooth wear on roe deer of known age: Variation within and among populations (1999) Can. J. Zool., 77, pp. 58-67; Illius, A.W., Gordon, I.J., The allometry of food intake in grazing ruminants (1987) J. Anim. Ecol., 56, pp. 989-999; Illius, A.W., Albon, S.D., Pemberton, J.M., Gordon, I.J., Clutton-Brock, T.H., Selection for foraging efficiency during a population crash in Soay sheep (1995) J. Anim. Ecol., 64, pp. 481-492; Kruuk, L.E.B., Slate, J., Pemberton, J.M., Brotherstone, S., Guinness, F., Clutton-Brock, T., Antler size in red deer: Heritability and selection but no evolution (2002) Evolution, 56, pp. 1683-1695; Lessels, C.M., Boag, P.T., Unrepeatable repeatabilities: A common mistake (1987) Auk, 104, pp. 116-121; Loison, A., Festa-Bianchet, M., Gaillard, J.-M., Jorgenson, J.T., Jullien, J.-M., Age-specific survival in five populations of ungulates: Evidence of senescence (1999) Ecology, 80, pp. 2539-2554; Milner, J.M., Albon, S.D., Illius, A.W., Pemberton, J.M., Glutton-Brock, T.H., Repeated selection of morphometric traits in the Soay sheep on St Kilda (1999) J. Anim. Ecol., 68, pp. 472-488; Pinheiro, J.C., Bates, D.M., (2001) Mixed Effects Models in S and S-Plus, , Springer-Verlag, New York; Santorra, A., Bentler, P.M., (1999) A Scaled Difference ?2 Test Statistic for Moment Structure Analysis, , http://preprints.stat.ucla.edu/260/260.pdf; Shipley, B., Testing causal explanations in organismal biology: Causation, correlation and structural equation modelling (1999) Oikos, 86, pp. 374-382; Shipley, B., (2000) Cause and Correlation in Biology: a User's Guide to Path Analysis, Structural Equations and Causal Inference, , Cambridge University Press, Cambridge; Skogland, T., Tooth wear by food limitation and its life history consequences in wild reindeer (1988) Oikos, 51, pp. 238-242; Smith, T.B., Bill size polymorphism and intraspecific niche utilization in an African finch (1987) Nature (Lond.), 329, pp. 717-719; Smith, T.B., Natural selection on bill characters in the two bill morphs of the African finch Pyrenestes ostrinus (1990) Evolution, 44, pp. 832-842; Sober, E., (1984) The Nature of Selection, , The MIT Press, Cambridge, Mass; Sokal, R.R., Rohlf, F.J., (1995) Biometry. 3rd Ed., , W.H. Freeman \& Co., New York; Venables, W.N., Ripley, B.D., (2002) Modern Applied Statistics with S. 4th Ed., , Springer-Verlag, Berlin; Wolfinger, R., O'Connell, M., Generalized linear mixed models: A pseudo-likelihood approach (1993) J. Stat. Comput. Simul., 48, pp. 233-243. },
    ABSTRACT = { Incisor-arcade size affects foraging efficiency in grazing ungulates and should be under strong selective pressure. We investigated individual variation in incisor-arcade size and its relationship with body mass and survival in bighorn sheep (Ovis canadensis) at Ram Mountain, Alberta, Canada, over 9 years. In adult ewes, incisor-arcade breadth and depth decreased with age, probably as a result of tooth wear. We found no effects of incisor-arcade size on survival of lambs or adult ewes. In adult ewes, an apparent positive effect of incisor-arcade size on survival disappeared when age was accounted for. Incisor-arcade breadth and depth had no effect on summer mass gain in lambs or adult ewes. Although linear models suggested that arcade breadth in lambs was correlated with summer mass gain, a latent variable path analysis model revealed that the correlation was due to an allometric relationship of arcade breadth with body size. Variation in incisor-arcade size in bighorn sheep appears to be due to individual variation in body size and age rather than to directional selection. },
    KEYWORDS = { Mathematical models Body mass Foraging Biodiversity age body mass dentition survival ungulate Alberta Canada North America Ram Mountain },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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