Solar noon and tactile cues synergistically regulate clutch size: a new approach to investigations of avian life‐history theory

Voss, Margaret A.; Cooper, Caren B.

doi:10.1111/ibi.12098

Cited by 3 publications

(3 citation statements)

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“…A final implication of our results is support for models of a photoperiod-stimulated ovary production cycle in birds (Zivkovic et al 2000;Cooper et al 2011;Voss & Cooper 2013). The temporal organization of behavioral and cellular events, as controlled by circadian clocks, enables organisms to synchronize behaviors and physiological processes with their external environment (Cassone & Menaker 1984;Bell-Pederson et al 2005;Sahar & Sassone-Corsi 2012).…”

Section: Discussionsupporting

confidence: 58%

“…An alternative, mechanistic approach, is to examine clutch dynamics within its heterochronic dimensions, namely as a sequence of phenological events (egg laying) with a start time, a frequency, and a termination time. Haywood 2013 (andreviewed in Voss andCooper 2013) demonstrated circumstances where the trait (or suite of traits) under selection was not the number of eggs in a clutch (an ordinal trait that we measure quantitatively) but the physiological mechanisms controlling the laying sequence. Birds have many neuroendocrine functions that are activated and regulated by sunlight.…”

Section: Discussionmentioning

confidence: 99%

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Changes in daylength links latitudinal and seasonal trends in clutch size

Burgess,

Voss,

Cooper

2023

Preprint

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Near ubiquitous reproductive trends across taxa follow a pattern in which output increases with latitudes and decreases with calendar date. Research grounded in life history theory provides separate ultimate explanations for latitudinal and seasonal trends. Here we frame these dual trends as a Simpson’s paradox and attempt to gain insights into proximate cues that might account for both simultaneously. Using citizen science data on Eastern bluebirds, we found highest support for a model of clutch size based on change in day length at clutch initiation. Describing reproductive trends based on non-biologically relevant constructs of latitude and calendar date obscured links between proximate and ultimate explanations. For birds, our findings are consistent with an internal coincidence model of circadian rhythmicity as a proximate control of clutch size. Other avian studies might benefit from viewing clutch size as a circadian behavior of clutch initiation and termination rather than a quantified trait.

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Section: Discussionsupporting

confidence: 58%

Section: Discussionmentioning

confidence: 99%

Changes in daylength links latitudinal and seasonal trends in clutch size

Burgess,

Voss,

Cooper

2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Our results, however, suggest that the differences between first and second clutches are related more to timing of nest initiation than to individual ability to acquire the nutrients needed to produce a large second clutch of eggs. Presumably this is related to the trade-off between clutch size and offspring reproductive value that occurs at the individual level, as described earlier (Rowe et al 1994), and may be triggered by physiological cues that are not explicitly related to nutrition (Voss and Cooper 2013). We do not mean to suggest that nutrition does not influence the clutch size of individuals-clearly it does, as we discussed above.…”

Section: Discussionmentioning

confidence: 70%