caa a22 4500 469098759 CHVBK 20180323133039.0 cr unu---uuuuu 170328e19920701xx s 000 0 eng 10.1007/BF01875454 doi (NATIONALLICENCE)springer-10.1007/BF01875454 Field metabolic rates and water influxes of two sympatric Gerbillidae: Gerbillus allenbyi and G. pyramidum [Elektronische Daten] [A. Degen, Berry Pinshow, Michael Kam] Summary: Two primarily granivorous rodents of Old World deserts,Gerbillus allenbyi (mean adult body mass=26 g) andG. pyramidum (mean adult body mass=40 g), coexist in sandy habitats in the northwestern Negev desert. Both species are burrow dwellers and are nocturnal; however, in their overall distributions,G. pyramidum occurs in more extreme deserts than doesG. allenbyi. In comparing field metabolic rate (FMR) and water influx of the twoGerbillus species, we considered two alternative hypotheses: (1) given the difference in their overall distributions,G. pyramidum has a lower FMR and water influx thanG. allenbyi, and (2) given the similarity in their diets, and that we worked with sympatric populations, FMR and water influx are similar. The latter alternative proved to be correct. Field metabolic rates in summer were 7.29 kJ · g-0.51 · day-1 forG. allenbyi and 7.74 kJ · g-0.51 · day-1 forG. pyramidum, values that were 69.3% and 74.5%, respectively, of those predicted for rodents of their body masses. Summer water influx ofG. allenbyi was 0.167 ml · g-0.90 · day-1 and that ofG. pyramidum was 0.144 ml · g-0.90 · day-1; these values were 79.4% and 68.6%, respectively, of water influxes predicted for rodents of their body masses. When compared allometrically, there were no interspecific differences in any of the measurements. Springer-Verlag, 1992 Gerbillus allenbyi nationallicence Gerbillus pyramidum nationallicence Granivorous desert rodents nationallicence Field metabolic rate nationallicence Water influx nationallicence Degen A. Isan Center for Comparative Medicine and Desert Animal Research, Jacob Blaustein Institute for Desert Research, Ben-Gurion, University of the Negev, 84105, Beer Sheva, Israel aut Pinshow Berry Mitrani Center for Desert Ecology, Jacob Blaustein Institute for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus, 84993, Israel aut Kam Michael Isan Center for Comparative Medicine and Desert Animal Research, Jacob Blaustein Institute for Desert Research, Ben-Gurion, University of the Negev, 84105, Beer Sheva, Israel aut Oecologia Springer-Verlag 90/4(1992-07-01), 586-590 0029-8549 90:4<586 1992 90 442 https://doi.org/10.1007/BF01875454 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01875454 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Degen A. Isan Center for Comparative Medicine and Desert Animal Research, Jacob Blaustein Institute for Desert Research, Ben-Gurion, University of the Negev, 84105, Beer Sheva, Israel aut NATIONALLICENCE 700 1- Pinshow Berry Mitrani Center for Desert Ecology, Jacob Blaustein Institute for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus, 84993, Israel aut NATIONALLICENCE 700 1- Kam Michael Isan Center for Comparative Medicine and Desert Animal Research, Jacob Blaustein Institute for Desert Research, Ben-Gurion, University of the Negev, 84105, Beer Sheva, Israel aut NATIONALLICENCE 773 0- Oecologia Springer-Verlag 90/4(1992-07-01), 586-590 0029-8549 90:4<586 1992 90 442 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer