Ce. Lewis et al., Food selection by the white-footed mouse (Peromyscus leucopus) on the basis of energy and protein contents, CAN J ZOOL, 79(4), 2001, pp. 562-568
Citations number
32
Categorie Soggetti
Animal Sciences
Journal title
CANADIAN JOURNAL OF ZOOLOGY-REVUE CANADIENNE DE ZOOLOGIE
We studied the combined effects of energy and protein contents on food sele
ction by the white-footed mouse, Peromyscus leucopus. Our objective was to
determine how variation in levels of a food component affected the overall
attractiveness of a food to the mice and whether trade-offs are made in sel
ecting dietary protein compared with energy. We conducted food-selection te
sts in the laboratory and field using foods containing different combinatio
ns of energy and protein levels. In the laboratory, P. leucopus were offere
d a choice between a high-energy and a low-energy food with the protein lev
el held constant and between a high-protein and a low-protein food with the
energy level held constant. The field study was set up to offer an encount
er with all four combinations of energy and protein simultaneously. We also
tested for preferred levels of protein using pairwise food-selection tests
in the laboratory. In the laboratory and field tests, P. leucopus selected
high-energy foods that were low in protein, but avoided all foods with a h
igh protein content. When given pairwise choices among foods containing 5,
15, 25, or 35% protein, P. leucopus consistently preferred the food with 15
% protein. Peromyscus leucopus quickly detected differences in protein and
energy levels in foods, selecting specific foods according to metabolic pro
fitability and nutrient needs.