Temperature and land use influence tree swallow individual health DOI Creative Commons

Joseph W. Corra,

S. Mažeika P. Sullivan

Conservation Physiology, Journal Year: 2021, Volume and Issue: 9(1)

Published: Jan. 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.

Language: Английский

Experimental facilitation of heat loss affects work rate and innate immune function in a breeding passerine bird DOI
Fredrik Andreasson, Arne Hegemann, Andreas Nord

et al.

Journal of Experimental Biology, Journal Year: 2020, Volume and Issue: unknown

Published: Jan. 1, 2020

The capacity to get rid of excess heat produced during hard work is a possible constraint on parental effort reproduction (heat dissipation limit [HDL] theory). We released hard-working blue tits (Cyanistes caeruleus) from this by experimentally removing ventral plumage. then assessed if changed their reproductive (feeding rate and nestling size) levels self-maintenance (change in body mass innate immune function). Feather-clipped females reduced the number feeding visits increased constitutive immunity compared unclipped but did not fledge smaller nestlings. Thus, they without compromising current output. In contrast, feather-clipping affect or function males, despite loss rate. Our results show that analyses physiological parameters, such as function, can be important when trying understand sources variation investment versus risk overheating influence reproduction.

Language: Английский

Citations

9
Temperature and land use influence tree swallow individual health DOI Creative Commons

Joseph W. Corra,

S. Mažeika P. Sullivan

Conservation Physiology, Journal Year: 2021, Volume and Issue: 9(1)

Published: Jan. 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.

Language: Английский

Citations

3