Gummivory in Cheirogaleids: Primitive Retention or Adaptation to Hypervariable Environments?
Gummivory in cheirogaleids, apart from the specialist gummivore Phaner, is often viewed as a fall-back diet; animals are forced to consume gums when other foods are unavailable. We propose an alternative explanation that cheirogaleid gummivory is an adaptation to hypervariable environments. First, we compared morphological adaptations to gummivory evinced by cheirogaleids and other gummivorous primates. Despite convergent trends, adaptations to gummivory are quite variable. Second, a long-term field study of the reddish-grey mouse lemur, Microcebus griseorufus, in the highly variable xerophytic forest of southern Madagascar reveals this species to be the most specialized gummivore of all known mouse lemurs. Third, a comparison of the nutritional composition of gums and fruits consumed by M. griseorufus shows these two food types to be of equivalent nutritive content. Gums consumed by M. griseorufus are exuded all year round, increasing the predictability of food availability in a hypervariable habitat, while fruit availability exhibits high intra- and inter-annual variation. Finally, we compared the global distributions of gummivorous mammals with a map of the regions subject to El Niño-related droughts, which indicated a strong congruence between gummivory and hypervariability.
KeywordsMouse Lemur Nutritive Content Tooth Comb Interdental Space Spiny Forest
Fabien Génin thanks the Fondation Fyssen and the CNRS for funding; Jean and Henri de Heaulme for their welcome in Berenty and Analabe private reserves; and Annette Hladik, Njaka, Genevievy, Eden Rabeson, and Bruno Simmen for their help. Judith Masters’ research is funded by the National Research Foundation under Grant number 2053615. Any opinion, findings, and conclusions or recommendations expressed in this material are those of the authors, and the NRF does not accept any liability in regard thereto. She thanks the following curators and collections managers for access to their collections: Drs Darrin Lunde (AMNH, New York), Suzanne MacLaren (CMNH, Pittsburgh), William Stanley (FMNH, Chicago), Christiane Denys (MNHN, Paris), Paula Jenkins (NHM, London), and Marc Herremanns and Wim Wendelin (RMCA, Tervuren). Joerg Ganzhorn’s research was funded by the DFG/BMZ (Ga 342/14-1) and carried out under the Accord de Collaboration between ANGAP (now Madagascar National Parks), the Département Biologie Animale of the Université d’Antananarivo, and the Department of Biology, Hamburg University. He thanks Professors Olga Ramilijaona and Daniel Rakotondravony for their help at various stages of the study.
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