Seasonal weather effects on offspring survival differ between reproductive stages in a long-lived neotropical seabird

Oecologia, Год журнала: 2022, Номер 199(3), С. 611 - 623

Опубликована: Июль 1, 2022

Язык: Английский

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Interacting effects of cold snaps, rain, and agriculture on the fledging success of a declining aerial insectivore

bioRxiv (Cold Spring Harbor Laboratory), Год журнала: 2021, Номер unknown

Опубликована: Июнь 30, 2021

Abstract Climate change predicts the increased frequency, duration, and intensity of inclement weather periods, such as unseasonably low temperatures (i.e., cold snaps) prolonged precipitation. Many migratory species have advanced phenology important life history stages, a result will likely be exposed to these periods spring more often, thus risking reduced fitness population growth. For declining avian species, including aerial insectivores, anthropogenic landscape changes agricultural intensification are another driver declines. These may affect foraging ability food provisioning parents, reduce survival nestlings weather, through for example pesticide exposure impairing thermoregulation punctual anorexia. Breeding in agro-intensive landscapes exacerbate negative effects under climate change. We observed that significant reduction availability insect prey occurred when daily maximum fell below 18.3°C, thereby defined any day where temperature this value witnessing snap. then combined information on occurrence snaps measures precipitation assess their impact fledging success Tree Swallows (Tachycineta bicolor) occupying nest box system placed across gradient intensification. Estimated insectivore was 36.2% lower broods experiencing four snap days during 12 post hatching period versus none, relationship worsened facing further found overall brood exacerbated landscapes. Our results indicate two primary hypothesized drivers many declines interact increase rate certain contexts.

Язык: Английский

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Temperature and land use influence tree swallow individual health

Conservation Physiology, Год журнала: 2021, Номер 9(1)

Опубликована: Янв. 1, 2021

Aerial insectivorous bird populations have declined precipitously in both North America and Europe. We assessed the effects of insect prey availability, climate shifts water quality associated with urbanization on haematocrit, haemoglobin concentration heterophil-lymphocyte (H/L) ratios among ~13-day-old tree swallow (Tachycineta bicolor) nestlings Columbus, Ohio area. Higher mean temperature increased frequency extreme heat days during early breeding period (May-June) were linked to reduced nestling physiological condition as evidenced by lower concentrations potentially due stress, availability or altered parental provisioning efforts. Urbanization size density emergent aquatic insects elevated whereas higher temperatures terrestrial related stress measured H/L ratios. Overall, these findings highlight complex environmental conditions driving health, which may be indicative post-fledging survival and, consequently, population growth. Our results underscore need for conservation approaches that adequately address interrelated changes climate, land use food resources aerial birds.

Язык: Английский

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Inconsistent shifts in warming and temperature variability negatively impact avian fitness

bioRxiv (Cold Spring Harbor Laboratory), Год журнала: 2023, Номер unknown

Опубликована: Апрель 29, 2023

ABSTRACT Climate change can create challenging conditions for reproduction by creating mismatches between breeding activity, resource availability, and favorable weather. Phenological advancement may mitigate some of these effects, but it also result in exposing developing offspring to greater temperature variability during reproduction. We combined >300,000 community science records with data on historical understand how exposure extreme climatic events (ECEs) has changed 24 North American songbirds breeding. More specifically, we wanted if changes average spring were associated when the latest cold-snap or earliest heat-wave occurred across range relationship individual fitness. While increased universally America since 1950, timing ECEs was inconsistent both direction magnitude. Moreover, increase did not predict amount timing. Thus, current relationships differ from those experienced historically After accounting covariates, found that 16 species had reduced reproductive success a attempt 11 occurred. Four five aerial insectivores included showed marked sensitivity ECEs, as all sallying insectivores. For three widespread species, evidence latitudinal differences susceptibility extremes. However, pattern differed each suggesting life history details might play an important role responses ECEs. Large-scale patterns consequences climate birds ultimately accumulated effects susceptibility. Our results add demonstrating understanding level linking them population processes is critical predicting vulnerability changing climates.

Язык: Английский

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Variation in reproductive investment increases body temperature amplitude in a temperate passerine

Oecologia, Год журнала: 2021, Номер 197(2), С. 365 - 371

Опубликована: Сен. 7, 2021

Many birds and mammals show substantial circadian variation in body temperature, which has been attributed to fluctuations ambient temperature energy reserves. However, fully understand the over course of day, we also need consider effects work rate. We made use a dataset on during resting active periods female marsh tits (Poecile palustris) that bred temperate area were subjected experimental changes reproductive investment through brood size manipulations. Furthermore, amplitude increased with daytime, but unaffected by nighttime, temperature. Amplitudes females manipulated broods 44% above predictions based inter-specific allometric relationships. In extreme cases, amplitudes > 100% predicted values. no individual realised maximum potential (8.5 °C, i.e. difference between highest lowest within population) seemed prioritise either reduction at night or an increase day. This suggests might be constrained costs preclude extensive both low nighttime high daytime temperatures same individual. range found here (0.5-6.7 °C) have previously mostly reported from sub-tropical and/or arid habitats. comparable values can amongst relatively cool, regions, partly due pronounced

Язык: Английский

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