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Test of the Optimal Body Size Model for Strepsirhines

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We determined if data on strepsirhine body and home range sizes support an optimal body size (OBS) model of 100 g, as predicted from studies of energetics in terrestrial mammals. We also tested the following predictions of the OBS model: 1) relationships between body and home range sizes will change slope and sign above and below the OBS threshold of 100 g and 2) best-fit lines for OBS regression models (above and below the 100-g threshold) will intersect at ca. 100 g (range of 80–250 g). We collected data on body mass, home range size, and vertical ranging behavior for 37 strepsirhines from the literature. Linear regression analyses and phylogenetic independent contrasts methods revealed that body size is a significant determinant of both 2-dimensional (ha) and 3-dimensional (km3) home range sizes only in taxa weighing >100 g. There were consistent changes in the sign of the slopes above and below the OBS threshold. The intersections of the best-fit lines were within the OBS range for the body size to 3-dimensional home range comparisons. Thus, the data provide some support for the OBS model in strepsirhines. However, no regression model was statistically significant for the taxa below the OBS threshold, which may reflect small sample sizes. Also, no slope differed significantly between taxa above and below the OBS. Significant correlations between body and home range sizes for the complete data sets refute the √-shaped constraint space predicted via the OBS model.

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ACKNOWLEDGMENTS

We thank Prof. Joerg Ganzhorn and Fabien Genin for providing unpublished data on body and home range sizes in Microcebus griseorufus, Richard Smith for advice on phylogenetic contrasts methods, as well as Michael Schillaci and the 2 reviewers for excellent comments on previous drafts of the manuscript. Our research was supported in part by a Discovery Grant from the Natural Sciences and Engineering Research Council of Canada, Connaught Foundation, an Ontario Graduate Scholarship, and The University of Toronto.

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  1. Department of Anthropology, University of Toronto, Toronto, Ontario, Canada, M5S 3G3

    Shawn M. Lehman, Mariam Nargolwalla, Nicole Taylor & Rochelle Lundy

  2. Faculty of Nursing, University of Calgary, Calgary, Alberta, Canada, T2N 1N4

    Andrea Faulkner

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Lehman, S.M., Nargolwalla, M., Faulkner, A. et al. Test of the Optimal Body Size Model for Strepsirhines. Int J Primatol 28, 211–230 (2007). https://doi.org/10.1007/s10764-006-9113-5

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