Temperature and land use influence tree swallow individual health.
| Autor: | Corra J; Office of Research and Development, U.S. Environmental Protection Agency, 26 Martin Luther King Dr., Cincinnati, OH 45268, USA., Sullivan SMP; School of Environment and Natural Resources, The Ohio State University, 125 Heffner Bldg 352 W. Dodridge St., Columbus, OH 43202, USA. |
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| Jazyk: | angličtina |
| Zdroj: | Conservation physiology [Conserv Physiol] 2021 Oct 25; Vol. 9 (1), pp. coab084. Date of Electronic Publication: 2021 Oct 25 (Print Publication: 2021). |
| DOI: | 10.1093/conphys/coab084 |
| Abstrakt: | Aerial insectivorous bird populations have declined precipitously in both North America and Europe. We assessed the effects of insect prey availability, climate and shifts in water quality associated with urbanization on haematocrit, haemoglobin concentration and heterophil-lymphocyte (H/L) ratios among ~13-day-old tree swallow ( Tachycineta bicolor ) nestlings in the Columbus, Ohio area. Higher mean temperature and increased frequency of extreme heat days during the early breeding period (May-June) were linked to reduced nestling physiological condition as evidenced by lower concentrations of haemoglobin and haematocrit, potentially due to increased heat stress, shifts in insect prey availability or altered parental provisioning efforts. Urbanization and the size and density of emergent aquatic insects were associated with elevated physiological stress, whereas higher mean temperatures and terrestrial insect size were related to lower stress as measured by H/L ratios. Overall, these findings highlight the complex environmental conditions driving nestling health, which may be indicative of post-fledging survival and, consequently, population growth. Our results underscore the need for conservation approaches that adequately address the interrelated effects of changes in climate, land use and food resources on aerial insectivorous birds. (© The Author(s) 2021. Published by Oxford University Press and the Society for Experimental Biology.) |
| Databáze: | MEDLINE |
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