Abstract
The saddleback tamarin (Saguinus fuscicollis)combines a number of behavioral and physiological attributes which seem to violate “rules” of ethology. Of particular interest is the combination of facultative polyandry and high paternal investment. The social organization and breeding system of the tamarin also appear to combine reproductive restraint with an extremely high reproductive potential. These paradoxes may be resolved by noting that the combination of ecological circumstances and breeding systems has produced a species of limited genetic variability. Inclusive fitness is an important factor in situations of low genetic variability and may explain these apparent paradoxes.
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