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Clarifying the cort-fitness hypothesis: A response to Dingemanse et al


Dingemanse et al. suggest that the Cort-Fitness Hypothesis rests upon the idea that ‘the optimal level of resources allocated towards self-maintenance (immediate survival) versus long-term survival and/or reproduction differs across environments, with selection favoring individuals investing in self-maintenance when the...

Stability of swimming performance and activity hierarchies among wild largemouth bass (Micropterus salmoides) at multiple temporal scales: Evidence for context-dependent shuffling between seasons


Laboratory-based studies of locomotory performance in many taxa have noted that individuals form stable hierarchies of organismal performance. Though laboratory studies of teleost fishes have consistently demonstrated individual repeatability of swimming performance, this phenomenon has rarely been studied in the...

The leaf size/number trade-off in herbaceous angiosperms



In this study, we examined the extent to which between-species leaf size variation relates to variation in the intensity of leaf production in herbaceous angiosperms. Leaf size variation has been most commonly interpreted in terms of biomechanical constraints (e.g...

Aspect diversity in moths revisited


Ricklefs and O’Rourke compared the diversity of appearance (aspect diversity) in samples of moths attracted to ultraviolet lights in Colorado, Arizona, and Panama. The more species‐rich Panamanian assemblage of moths exhibited proportionately greater diversity of color and form, which supported...

Do baseline glucocorticoids predict fitness?


Baseline glucocorticoid (cort) levels are increasingly employed as physiological indices of the relative condition or health of individuals and populations. Often, high cort levels are assumed to indicate an individual or population in poor condition and with low relative fitness...

Habitat fragmentation and paternity in least flycatchers


We examined the effect of habitat fragmentation, as well as breeding density and synchrony, on realized reproductive success of male Least Flycatchers (Empidonax minimus). Both breeding density and synchrony were similar in both continuous (6.75 males/ha, 3.40; respectively) and fragmented...

Stress, song and survival in sparrows


The stress response—increases in circulating glucocorticoids following a stressor—is typically considered adaptive, but few studies address the fitness consequences of individual variation in stress response. Generally, due to negative consequences of prolonged elevation of glucocorticoids, animals should have a transient...