Journal
BEHAVIORAL ECOLOGY AND SOCIOBIOLOGY
Volume 71, Issue 12, Pages -Publisher
SPRINGER
DOI: 10.1007/s00265-017-2416-z
Keywords
Residual reproductive value; Life history evolution; Condition-dependent reproductive investment; Fecundity compensation; Phenotypic plasticity
Categories
Funding
- National Science Foundation [IOS 16-54028]
- Illinois State University Summer Faculty Fellowship
- Illinois State University Faculty Research Award
- National Institutes of Health [2R15HD076308-02A1]
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Although reproductive strategies can be influenced by a variety of intrinsic and extrinsic factors, life history theory provides a rigorous framework for explaining variation in reproductive effort. The terminal investment hypothesis proposes that a decreased expectation of future reproduction (as might arise from a mortality threat) should precipitate increased investment in current reproduction. Terminal investment has been widely studied, and a variety of intrinsic and extrinsic cues that elicit such a response have been identified across an array of taxa. Although terminal investment is often treated as a static strategy, the level at which a cue of decreased future reproduction is sufficient to trigger increased current reproductive effort (i.e., the terminal investment threshold) may depend on the context, including the internal state of the organism or its current external environment, independent of the cue that triggers a shift in reproductive investment. Here, we review empirical studies that address the terminal investment hypothesis, exploring both the intrinsic and extrinsic factors that mediate its expression. Based on these studies, we propose a novel framework within which to view the strategy of terminal investment, incorporating factors that influence an individual's residual reproductive value beyond a terminal investment trigger-the dynamic terminal investment threshold.
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