Physiological adjustments to high foraging effort negatively affect fecundity but not final reproductive output in captive zebra finches
| Autor: | Melissa L. Vermette, Olivia Tsai, Tony D. Williams, Donald R. Powers, Kang Nian Yap |
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| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
Physiology Offspring 030310 physiology media_common.quotation_subject Foraging Zoology Aquatic Science Affect (psychology) 010603 evolutionary biology 01 natural sciences 03 medical and health sciences Animals Molecular Biology Ecology Evolution Behavior and Systematics media_common 0303 health sciences biology Reproduction Workload biology.organism_classification Fecundity Breed Oxidative Stress Fertility Insect Science Animal Science and Zoology Finches Taeniopygia |
| Zdroj: | The Journal of experimental biology. 224(8) |
| ISSN: | 1477-9145 |
| Popis: | Foraging at elevated rates to provision offspring is thought to be an energetically costly activity and it has been suggested that there are physiological costs associated with the high workload involved. However, for the most part, evidence for costs of increased foraging and/or reproductive effort is weak. Furthermore, despite some experimental evidence demonstrating negative effects of increased foraging and parental effort, the physiological mechanisms underlying costs associated with high workload remain poorly understood. To examine how high workload affects haematology, oxidative stress and reproductive output, we experimentally manipulated foraging effort in captive zebra finches, Taeniopygia guttata, using a previously described technique, and allowed individuals to breed first in low foraging effort conditions and then in high foraging effort conditions. We found that birds upregulated haematocrit and haemoglobin concentration in response to training. Birds subjected to increased workload during reproduction had lower fecundity, although final reproductive output was not significantly different than that of controls. Offspring of parents subjected to high workload during reproduction also had higher oxidative stress when they were 90 days of age. Total antioxidant capacity and reactive oxygen metabolites of birds responded differently in the two breeding attempts, but we did detect an overall increase in oxidative stress in response to training in either attempt, which could explain the lower fecundity observed in birds subjected to increased workload during reproduction. |
| Databáze: | OpenAIRE |
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