Natal experience and pre‐breeding environmental conditions affect lay date plasticity in Savannah Sparrows
| Autor: | D. Ryan Norris, Stéphanie M. Doucet, Greg W. Mitchell, Nathaniel T. Wheelwright, Bradley K. Woodworth, Daniel J. Mennill, Joseph B. Burant, Shannon Whelan, Amy E. M. Newman, Eric W. Heisey |
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| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
media_common.quotation_subject Population 010603 evolutionary biology 01 natural sciences Population density Passerculus 03 medical and health sciences Animals education Ecology Evolution Behavior and Systematics 030304 developmental biology media_common 0303 health sciences Phenotypic plasticity education.field_of_study biology Ecology Phenology Reproduction Temperature biology.organism_classification Fecundity Annual cycle Fertility 13. Climate action Female Seasons Sparrows Demography |
| Zdroj: | Ecology. 103 |
| ISSN: | 1939-9170 0012-9658 |
| Popis: | Phenotypic plasticity allows organisms to adjust the timing of life-history events in response to environmental and demographic conditions. Shifts by individuals in the timing of breeding with respect to variation in age and temperature are well documented in nature, and these changes are known to scale to affect population dynamics. However, relatively little is known about how organisms alter phenology in response to other demographic and environmental factors. We investigated how pre-breeding temperature, breeding population density, age, and rainfall in the first month of life influenced the timing and plasticity of lay date in a population of Savannah sparrows (Passerculus sandwichensis) monitored over 33 years (1987-2019). Females that experienced warmer pre-breeding temperatures tended to lay eggs earlier, and also advanced their lay date as they aged, but breeding population density had no effect on lay date. Natal precipitation interacted with age to influence lay date plasticity, with females that experienced high precipitation levels as nestlings advancing lay dates more strongly over the course of their lives. We also found evidence for varied pace of life; females that experienced high natal precipitation had shorter lifespans and reduced fecundity, but more nesting attempts over their lifetimes. Rainfall during the nestling period increased through time, while population density and fecundity declined, suggesting that increased precipitation on the breeding grounds may be detrimental to breeding females and ultimately the viability of the population as a whole. Our results suggest that females adjust their laying date in response to pre-breeding temperature, and as they age, while presenting new evidence that environmental conditions during the natal period can affect phenological plasticity and generate downstream, population-level effects. |
| Databáze: | OpenAIRE |
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