Body Mass of Female Cooper's Hawks is Unrelated to Longevity and Breeding Dispersal: Implications for the Study of Breeding Dispersal

Rosenfield, Robert N.; Bielefeldt, John; Haynes, Taylor G.; Hardin, Madeline G.; Glassen, Frederick J.; Booms, Travis L.

doi:10.3356/jrr-15-30.1

Cited by 11 publications

(20 citation statements)

References 27 publications

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“…These findings suggest that it may be untenable to assume exclusive import of food (which entity is often used as an index to quality of territory) on the site where a female nests (Rosenfield et al . ). Notably, Morrison et al .…”

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confidence: 97%

“…, Rosenfield et al . ). These covariates conventionally include history of nesting success, age, sex and especially territory quality (e.g.…”

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confidence: 97%

“…, Rosenfield & Bielefeldt , Rosenfield et al . ). This seems remarkable given the voluminous literature detailing the import of intrinsic individual qualities as apparently important secondary sexual characteristics among potential mates in birds (e.g.…”

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confidence: 97%

“…, Rosenfield et al . , ,b). Indeed, food resources obtained via frequent territorial trespassing during pre‐incubation in Black Kites Milvus migrans (Sergio et al .…”

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confidence: 99%

“…For want of context further not offered, another possible aggravator of Hunt's narrative is that an occupant's fitness is linked exclusively to the site on which it breeds, which may not be true, at least in Cooper's Hawks Accipiter cooperii and perhaps other raptor species (e.g. Sergio et al 2011, Rosenfield et al 2015a, 2016a. Indeed, food resources obtained via frequent territorial trespassing during pre-incubation in Black Kites Milvus migrans (Sergio et al 2011), and through apparent frequent courtship feeding of females by males (including floaters) in trades for extra-pair copulations when females make extra-territorial visits in Cooper's Hawks (Rosenfield et al 2015a), could contribute to the eventual reproductive success of a female.…”

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Moffat's anticipation of 21st century bird population dynamics theory: is variation in site quality exclusively the core tenant?

Rosenfield

2017

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confidence: 97%

“…, Rosenfield et al . ). These covariates conventionally include history of nesting success, age, sex and especially territory quality (e.g.…”

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confidence: 97%

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confidence: 97%

“…, Rosenfield et al . , ,b). Indeed, food resources obtained via frequent territorial trespassing during pre‐incubation in Black Kites Milvus migrans (Sergio et al .…”

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confidence: 99%

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confidence: 99%

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Moffat's anticipation of 21st century bird population dynamics theory: is variation in site quality exclusively the core tenant?

Rosenfield

2017

Ibis

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Are life history events of a northern breeding population of Cooper's Hawks influenced by changing climate?

Rosenfield

Hardin

Bielefeldt³

et al. 2016

Ecology and Evolution

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Numerous studies have demonstrated earlier timing of spring migration and egg‐laying in small passerines, but documentation of such responses to recent climate change in the life histories of higher trophic feeding birds such as raptors is relatively scarce. Raptors may be particularly susceptible to possible adverse effects of climate change due to their longer generation turnover times and lower reproductive capacity, which could lead to population declines because of an inability to match reproductive timing with optimal brood rearing conditions. Conversely adaptively favorable outcomes due to the influence of changing climate may occur. In general, birds that seasonally nest earlier typically have higher reproductive output compared to conspecifics that nest later in the season. Given the strong seasonal decline in reproductive output, and the heritability of nesting phenology, it is possible that nesting seasons would (adaptively) advance over time. Recent climate warming may release prior ecological constraints on birds that depend on food availability at the time of egg production, as do various raptors including Cooper's Hawks (Accipiter cooperii). Under this scenario, productivity, especially clutch size, might increase because it is likely that this reproductive demographic may be the most immediate response to the earlier seasonal presence of food resources. We demonstrated a statistically significant shift of about 4–5 days to an earlier timing of egg‐hatching in spring across 36 years during 1980–2015 for a partially migratory population of Cooper's Hawks in Wisconsin, United States, which is consistent with a recent study that showed that Cooper's Hawks had advanced their timing of spring migration during 1979–2012. Both studies occurred in the Great Lakes region, an area that compared to global averages is experiencing earlier and increased warming particularly in the spring in Wisconsin. The nesting period did not lengthen. We suggest that the gradual shift of six consecutive generations of hawks was likely in response to recent climate change or warming. We did not detect any long‐term temporal change in average clutch or brood sizes. However, such indices of reproduction are among the highest known for the species and thus may be at their physio‐ecological maximum for this population. Our study population appears to show resilience to and does not appear to be adversely influenced by the recent rate of changing climate at this time.

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Combined high rates of alternative breeding strategies unexpectedly found among populations of a solitary nesting raptor

Rosenfield,

Sonsthagen,

Stout

et al. 2024

Ecology and Evolution

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Social monogamy is the prevalent mating system in birds, but alternative strategies of extra‐pair paternity (EPP) and conspecific brood parasitism (CBP) occur in many species. Raptors are virtually absent in discussions of broad taxonomic reviews regarding EPP and CBP likely because these strategies are mostly absent or at low frequency; CBP is unreported in solitary nesting raptors. In contrast, we found high frequencies of EPP (16%–31%) and CBP (15%–26%) nests among three populations of Cooper's Hawks (Accipiter cooperii) across the northern breeding range of this solitary nesting, socially monogamous species. EPP and CBP combined occurred in 42%–46% of all nests among populations and hence unexpectedly were nearly equivalent to proportions of genetically monogamous nests. Select covariates failed to predict presence of EPP and CBP in part because virtually all extra‐pair adults were uncaught and likely were floaters. We found no support for the hypothesis that territorial females traded copulations for food to maximize energy intake for increased production. Our unique discoveries enhance knowledge of the extent and diversity of alternative breeding strategies among groups of avian and other animal species.

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Body Mass of Female Cooper's Hawks is Unrelated to Longevity and Breeding Dispersal: Implications for the Study of Breeding Dispersal

Cited by 11 publications

References 27 publications

Moffat's anticipation of 21st century bird population dynamics theory: is variation in site quality exclusively the core tenant?

Moffat's anticipation of 21st century bird population dynamics theory: is variation in site quality exclusively the core tenant?

Are life history events of a northern breeding population of Cooper's Hawks influenced by changing climate?

Combined high rates of alternative breeding strategies unexpectedly found among populations of a solitary nesting raptor

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