1
|
D'Amelio PB, Covas R, Ferreira AC, Fortuna R, Silva LR, Theron F, Rybak F, Doutrelant C. Benefits of Pair-Bond Duration on Reproduction in a Lifelong Monogamous Cooperative Passerine. Am Nat 2024; 203:576-589. [PMID: 38635359 DOI: 10.1086/729436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/20/2024]
Abstract
AbstractLong-term social and genetic monogamy is rare in animals except birds, but even in birds it is infrequent and poorly understood. We investigated possible advantages of monogamy in a colonial, facultative cooperatively breeding bird from an arid, unpredictable environment, the sociable weaver (Philetairus socius). We documented divorce and extrapair paternity of 703 pairs over 10 years and separated effects of pair duration from breeding experience by analyzing longitudinal and cross-sectional datasets. Parts of the colonies were protected from nest predation, thereby limiting its stochastic and thus confounding effect on fitness measures. We found that 6.4% of sociable weaver pairs divorced and 2.2% of young were extrapair. Longer pair-bonds were associated with more clutches and fledglings per season and with reproducing earlier and later in the season, when snake predation is lower, but not with increased egg or fledgling mass or with nestling survival. Finally, the number of helpers at the nest increased with pair-bond duration. Results were similar for protected and unprotected nests. We suggest that long-term monogamy is associated with a better capacity for exploiting a temporally unpredictable environment and helps to form larger groups. These results can contribute to our understanding of why long-term monogamy is frequently associated with unpredictable environments and cooperation.
Collapse
|
2
|
Fortuna R, Covas R, D'Amelio PB, Silva LR, Parenteau C, Bliard L, Rybak F, Doutrelant C, Paquet M. Interplay of cooperative breeding and predation risk on egg allocation and reproductive output. Behav Ecol 2024; 35:arae010. [PMID: 38486920 PMCID: PMC10939053 DOI: 10.1093/beheco/arae010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Revised: 01/21/2024] [Accepted: 02/27/2024] [Indexed: 03/17/2024] Open
Abstract
Predation risk can influence behavior, reproductive investment, and, ultimately, individuals' fitness. In high-risk environments, females often reduce allocation to reproduction, which can affect offspring phenotype and breeding success. In cooperative breeders, helpers contribute to feed the offspring, and groups often live and forage together. Helpers can, therefore, improve reproductive success, but also influence breeders' condition, stress levels and predation risk. Yet, whether helper presence can buffer the effects of predation risk on maternal reproductive allocation remains unstudied. Here, we used the cooperatively breeding sociable weaver Philetairus socius to test the interactive effects of predation risk and breeding group size on maternal allocation to clutch size, egg mass, yolk mass, and yolk corticosterone. We increased perceived predation risk before egg laying using playbacks of the adults' main predator, gabar goshawk (Micronisus gabar). We also tested the interactive effects of group size and prenatal predator playbacks on offspring hatching and fledging probability. Predator-exposed females laid eggs with 4% lighter yolks, but predator-calls' exposure did not clearly affect clutch size, egg mass, or egg corticosterone levels. Playback-treatment effects on yolk mass were independent of group size, suggesting that helpers' presence did not mitigate predation risk effects on maternal allocation. Although predator-induced reductions in yolk mass may decrease nutrient availability to offspring, potentially affecting their survival, playback-treatment effects on hatching and fledging success were not evident. The interplay between helper presence and predator effects on maternal reproductive investment is still an overlooked area of life history and physiological evolutionary trade-offs that requires further studies.
Collapse
Affiliation(s)
- Rita Fortuna
- CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO Laboratório Associado, Campus de Vairão, Universidade do Porto, 4485-661, Vairão, Portugal
- Departamento de Biologia, Faculdade de Ciências, Universidade do Porto, 4099-002, Porto, Portugal
- BIOPOLIS Program in Genomics, Biodiversity and Land Planning, CIBIO, Campus de Vairão, 4485-661, Vairão, Portugal
- Centre for Biodiversity Dynamics, Institutt for Biologi, NTNU, 7491, Trondheim, Norway
| | - Rita Covas
- CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO Laboratório Associado, Campus de Vairão, Universidade do Porto, 4485-661, Vairão, Portugal
- BIOPOLIS Program in Genomics, Biodiversity and Land Planning, CIBIO, Campus de Vairão, 4485-661, Vairão, Portugal
- FitzPatrick Institute, DST-NRF Centre of Excellence, University of Cape Town, 7701, Cape Town, South Africa
| | - Pietro B D'Amelio
- CEFE, Univ Montpellier, CNRS, EPHE, IRD, 34293, Montpellier, France
- Université Paris-Saclay, CNRS, Institut des Neurosciences Paris-Saclay, 91400, Saclay, France
| | - Liliana R Silva
- CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO Laboratório Associado, Campus de Vairão, Universidade do Porto, 4485-661, Vairão, Portugal
- BIOPOLIS Program in Genomics, Biodiversity and Land Planning, CIBIO, Campus de Vairão, 4485-661, Vairão, Portugal
| | - Charline Parenteau
- Centre d’Etudes Biologiques de Chizé, CNRS-La Rochelle Université, 79360, Villiers-en-Bois, France
| | - Louis Bliard
- Department of Evolutionary Biology & Environmental Studies, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland
| | - Fanny Rybak
- Université Paris-Saclay, CNRS, Institut des Neurosciences Paris-Saclay, 91400, Saclay, France
| | - Claire Doutrelant
- FitzPatrick Institute, DST-NRF Centre of Excellence, University of Cape Town, 7701, Cape Town, South Africa
- CEFE, Univ Montpellier, CNRS, EPHE, IRD, 34293, Montpellier, France
| | - Matthieu Paquet
- Institute of Mathematics of Bordeaux, University of Bordeaux, CNRS, Bordeaux INP, 33405, Talence, France
- Theoretical and Experimental Ecology Station (SETE), CNRS, 09200, Moulis, France
| |
Collapse
|
3
|
Fortuna R, Paquet M, Biard C, Élard L, Ferreira AC, Leroux-Coyaux M, Parenteau C, Silva LR, Théron F, Covas R, Doutrelant C. Egg components and offspring survival vary with group size and laying order in a cooperative breeder. Oecologia 2023; 202:129-142. [PMID: 37148378 DOI: 10.1007/s00442-023-05379-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Accepted: 04/25/2023] [Indexed: 05/08/2023]
Abstract
Prenatal resource allocation to offspring can be influenced by maternal environment and offspring value, and affect offspring survival. An important pathway for flexible maternal allocation is via egg components such as nutrients and hormones. In cooperative breeders, females with helpers may increase resource allocation to eggs-'differential allocation'-or reduce it-'load-lightening'. Yet, helper effects on egg composition have been poorly studied. Moreover, it is unknown how helpers' presence modulates laying order effects on egg content and survival. Here, we investigated how maternal allocation varied with group size and laying order in the cooperatively breeding sociable weaver (Philetairus socius). We estimated interactive effects of helpers and laying order on allocation to egg mass, yolk nutrients-yolk mass, proteins, lipids, carotenoids, vitamin A and vitamin E-and hormones-testosterone, androstenedione, and corticosterone. Results concurred with the 'differential allocation' predictions. Females with more helpers produced later-laid eggs with heavier yolks and more lipids, and laid eggs overall richer in lipids. Proteins, antioxidants, and hormones were not found to vary with helper number. We then analyzed how helper number modulated laying order effects on survival. Females with more helpers did not specifically produce later-laid eggs with higher survival, but eggs laid by females with more helpers were overall more likely to fledge. These findings show that some egg components (yolk mass, lipids) can positively vary according to females' breeding group size, which may improve offspring fitness.
Collapse
Affiliation(s)
- Rita Fortuna
- CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO Laboratório Associado, Campus de Vairão, Universidade do Porto, 4485-661, Vairão, Portugal.
- Departamento de Biologia, Faculdade de Ciências, Universidade do Porto, 4099-002, Porto, Portugal.
- BIOPOLIS Program in Genomics, Biodiversity and Land Planning, CIBIO, Campus de Vairão, 4485-661, Vairão, Portugal.
- Centre d'Ecologie Fonctionnelle et Evolutive, CEFE, CNRS, Univ Montpellier, EPHE, IRD, 34293, Montpellier, France.
- Centre for Biodiversity Dynamics, Institutt for Biologi, NTNU, Trondheim, Norway.
| | - Matthieu Paquet
- Department of Ecology, Swedish University of Agricultural Sciences, P.O. Box 7044, 75007, Uppsala, Sweden
- Institute of Mathematics of Bordeaux, University of Bordeaux, CNRS, Bordeaux INP, Talence, France
| | - Clotilde Biard
- Sorbonne Université, UPEC, CNRS, IRD, INRA, Institut d'Écologie et des Sciences de l'Environnement de Paris, IEES, 75005, Paris, France
| | - Loïc Élard
- Sorbonne Université, UPEC, CNRS, IRD, INRA, Institut d'Écologie et des Sciences de l'Environnement de Paris, IEES, 75005, Paris, France
| | - André C Ferreira
- CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO Laboratório Associado, Campus de Vairão, Universidade do Porto, 4485-661, Vairão, Portugal
- BIOPOLIS Program in Genomics, Biodiversity and Land Planning, CIBIO, Campus de Vairão, 4485-661, Vairão, Portugal
- Centre d'Ecologie Fonctionnelle et Evolutive, CEFE, CNRS, Univ Montpellier, EPHE, IRD, 34293, Montpellier, France
- Department of Evolutionary Biology and Environmental Studies, University of Zurich, Winterthurerstrasse 190, 8057, Zurich, Switzerland
| | - Mathieu Leroux-Coyaux
- Sorbonne Université, UPEC, CNRS, IRD, INRA, Institut d'Écologie et des Sciences de l'Environnement de Paris, IEES, 75005, Paris, France
| | - Charline Parenteau
- Centre d'Etudes Biologiques de Chizé, CNRS-La Rochelle Université, Villiers-en-Bois, France
| | - Liliana R Silva
- CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO Laboratório Associado, Campus de Vairão, Universidade do Porto, 4485-661, Vairão, Portugal
- BIOPOLIS Program in Genomics, Biodiversity and Land Planning, CIBIO, Campus de Vairão, 4485-661, Vairão, Portugal
| | - Franck Théron
- CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO Laboratório Associado, Campus de Vairão, Universidade do Porto, 4485-661, Vairão, Portugal
- BIOPOLIS Program in Genomics, Biodiversity and Land Planning, CIBIO, Campus de Vairão, 4485-661, Vairão, Portugal
- Centre d'Ecologie Fonctionnelle et Evolutive, CEFE, CNRS, Univ Montpellier, EPHE, IRD, 34293, Montpellier, France
| | - Rita Covas
- CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO Laboratório Associado, Campus de Vairão, Universidade do Porto, 4485-661, Vairão, Portugal
- BIOPOLIS Program in Genomics, Biodiversity and Land Planning, CIBIO, Campus de Vairão, 4485-661, Vairão, Portugal
- DST-NRF Centre of Excellence, FitzPatrick Institute, University of Cape Town, Cape Town, South Africa
| | - Claire Doutrelant
- Centre d'Ecologie Fonctionnelle et Evolutive, CEFE, CNRS, Univ Montpellier, EPHE, IRD, 34293, Montpellier, France
- DST-NRF Centre of Excellence, FitzPatrick Institute, University of Cape Town, Cape Town, South Africa
| |
Collapse
|
4
|
Culbert BM, Border SE, Fialkowski RJ, Bolitho I, Dijkstra PD. Social status influences relationships between hormones and oxidative stress in a cichlid fish. Horm Behav 2023; 152:105365. [PMID: 37119610 DOI: 10.1016/j.yhbeh.2023.105365] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Revised: 04/11/2023] [Accepted: 04/12/2023] [Indexed: 05/01/2023]
Abstract
An individual's social environment can have widespread effects on their physiology, including effects on oxidative stress and hormone levels. Many studies have suggested that variation in oxidative stress experienced by individuals of different social statuses might be due to endocrine differences, however, few studies have evaluated this hypothesis. Here, we assessed whether a suite of markers associated with oxidative stress in different tissues (blood/plasma, liver, and gonads) had social status-specific relationships with circulating testosterone or cortisol levels in males of a cichlid fish, Astatotilapia burtoni. Across all fish, blood DNA damage (a global marker of oxidative stress) and gonadal synthesis of reactive oxygen species [as indicated by NADPH-oxidase (NOX) activity] were lower when testosterone was high. However, high DNA damage in both the blood and gonads was associated with high cortisol in subordinates, but low cortisol in dominants. Additionally, high cortisol was associated with greater production of reactive oxygen species (greater NOX activity) in both the gonads (dominants only) and liver (dominants and subordinates). In general, high testosterone was associated with lower oxidative stress across both social statuses, whereas high cortisol was associated with lower oxidative stress in dominants and higher oxidative stress in subordinates. Taken together, our results show that differences in the social environment can lead to contrasting relationships between hormones and oxidative stress.
Collapse
Affiliation(s)
- Brett M Culbert
- Department of Integrative Biology, University of Guelph, Guelph, Ontario, Canada.
| | - Shana E Border
- Department of Biology, Central Michigan University, Mount Pleasant, MI, USA; Illinois State University, School of Biological Sciences, Normal, IL, USA
| | | | - Isobel Bolitho
- University of Manchester, Department of Earth and Environmental Sciences, Manchester, UK
| | - Peter D Dijkstra
- Department of Biology, Central Michigan University, Mount Pleasant, MI, USA; Neuroscience Program, Central Michigan University, Mount Pleasant, MI, USA; Institute for Great Lakes Research, Central Michigan University, Mount Pleasant, MI, USA.
| |
Collapse
|
5
|
Lemonnier C, Bize P, Boonstra R, Dobson FS, Criscuolo F, Viblanc VA. Effects of the social environment on vertebrate fitness and health in nature: Moving beyond the stress axis. Horm Behav 2022; 145:105232. [PMID: 35853411 DOI: 10.1016/j.yhbeh.2022.105232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Revised: 06/04/2022] [Accepted: 06/22/2022] [Indexed: 11/22/2022]
Abstract
Social interactions are a ubiquitous feature of the lives of vertebrate species. These may be cooperative or competitive, and shape the dynamics of social systems, with profound effects on individual behavior, physiology, fitness, and health. On one hand, a wealth of studies on humans, laboratory animal models, and captive species have focused on understanding the relationships between social interactions and individual health within the context of disease and pathology. On the other, ecological studies are attempting an understanding of how social interactions shape individual phenotypes in the wild, and the consequences this entails in terms of adaptation. Whereas numerous studies in wild vertebrates have focused on the relationships between social environments and the stress axis, much remains to be done in understanding how socially-related activation of the stress axis coordinates other key physiological functions related to health. Here, we review the state of our current knowledge on the effects that social interactions may have on other markers of vertebrate fitness and health. Building upon complementary findings from the biomedical and ecological fields, we identify 6 key physiological functions (cellular metabolism, oxidative stress, cellular senescence, immunity, brain function, and the regulation of biological rhythms) which are intimately related to the stress axis, and likely directly affected by social interactions. Our goal is a holistic understanding of how social environments affect vertebrate fitness and health in the wild. Whereas both social interactions and social environments are recognized as important sources of phenotypic variation, their consequences on vertebrate fitness, and the adaptive nature of social-stress-induced phenotypes, remain unclear. Social flexibility, or the ability of an animal to change its social behavior with resulting changes in social systems in response to fluctuating environments, has emerged as a critical underlying factor that may buffer the beneficial and detrimental effects of social environments on vertebrate fitness and health.
Collapse
Affiliation(s)
- Camille Lemonnier
- Ecole Normale Supérieur de Lyon, 69342 Lyon, France; Université de Strasbourg, CNRS, IPHC UMR 7178, 67000 Strasbourg, France.
| | - Pierre Bize
- School of Biological Sciences, University of Aberdeen, Aberdeen, UK; Swiss Institute of Ornithology, Sempach, Switzerland
| | - Rudy Boonstra
- Department of Biological Sciences, University of Toronto Scarborough, Toronto, Canada
| | - F Stephen Dobson
- Université de Strasbourg, CNRS, IPHC UMR 7178, 67000 Strasbourg, France; Department of Biological Sciences, Auburn University, Auburn, AL, USA
| | | | - Vincent A Viblanc
- Université de Strasbourg, CNRS, IPHC UMR 7178, 67000 Strasbourg, France
| |
Collapse
|
6
|
Fialkowski RJ, Border SE, Bolitho I, Dijkstra PD. Social dominance and reproduction result in increased integration of oxidative state in males of an African cichlid fish. Comp Biochem Physiol A Mol Integr Physiol 2022; 269:111216. [PMID: 35430378 DOI: 10.1016/j.cbpa.2022.111216] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Revised: 04/08/2022] [Accepted: 04/10/2022] [Indexed: 10/18/2022]
Abstract
Oxidative stress is a potential cost of social dominance and reproduction, which could mediate life history trade-offs between current and future reproductive fitness. However, the evidence for an oxidative cost of social dominance and reproduction is mixed, in part because organisms have efficient protective mechanisms that can counteract oxidative insults. Further, previous studies have shown that different aspects of oxidative balance, including oxidative damage and antioxidant function, vary dramatically between tissue types, yet few studies have investigated oxidative cost in terms of interconnectedness and coordination within the system. Here, we tested whether dominant and subordinate males of the cichlid Astatotilapia burtoni differ in integration of different components of oxidative stress. We assessed 7 markers of oxidative stress, which included both oxidative damage and antioxidant function in various tissue types (total of 14 measurements). Across all oxidative stress measurements, we found more co-regulated clusters in dominant males, suggesting that components of oxidative state are more functionally integrated in dominant males than they are in subordinate males. We discuss how a high degree of functional integration reflects increased robustness or efficiency of the system (e.g. increased effectiveness of antioxidant machinery in reducing oxidative damage), but we also highlight potential costs (e.g. activation of cytoprotective mechanisms may have unwanted pleiotropic effects). Overall, our results suggest that quantifying the extent of functional integration across different components of oxidative stress could reveal insights into the oxidative cost of important life history events.
Collapse
Affiliation(s)
- Robert J Fialkowski
- Central Michigan University, Department of Biology, Mount Pleasant, MI, USA.
| | - Shana E Border
- Central Michigan University, Department of Biology, Mount Pleasant, MI, USA; Illinois State University, School of Biological Sciences, Normal, IL, USA
| | - Isobel Bolitho
- University of Manchester, Department of Earth and Environmental Sciences, Manchester, UK
| | - Peter D Dijkstra
- Central Michigan University, Department of Biology, Mount Pleasant, MI, USA; Neuroscience Program, Central Michigan University, Mount Pleasant, MI, USA; Institute for Great Lakes Research, Central Michigan University, Mount Pleasant, MI, USA
| |
Collapse
|
7
|
Theuerkauf J, Villavicencio CP, Adreani NM, Attisano A, Craig A, D'Amelio PB, Gula R, Lee ATK, Mentesana L, Quillfeldt P, Quirici V, Quispe R, Vásquez RA, Wingfield JC, Masello JF. Austral birds offer insightful complementary models in ecology and evolution. Trends Ecol Evol 2022; 37:759-767. [PMID: 35691772 DOI: 10.1016/j.tree.2022.05.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Revised: 05/09/2022] [Accepted: 05/11/2022] [Indexed: 11/18/2022]
Abstract
The Southern Hemisphere differs from the Northern Hemisphere in many aspects. However, most ecological and evolutionary research is conducted in the Northern Hemisphere and its conclusions are extrapolated to the entire globe. Therefore, unique organismal and evolutionary characteristics of the south are overlooked. We use ornithology to show the importance of including a southern perspective. We present examples of plumage pigmentation, brood-parasitic nestling ejection, flightlessness, female song, and female aggression modulated by progesterone as complementary models for investigating fundamental biological questions. More research in the Southern Hemisphere, together with increased cooperation among researchers across the hemispheres and within the Southern Hemisphere, will provide a greater global outlook into ecology and evolution.
Collapse
Affiliation(s)
- Jörn Theuerkauf
- Museum and Institute of Zoology, Polish Academy of Sciences, 00-679 Warsaw, Poland.
| | - Camila P Villavicencio
- Institute of Ecology and Biodiversity, Department of Ecological Sciences, Faculty of Sciences, University of Chile, 7800003 Santiago, Chile
| | - Nicolas M Adreani
- KLF Core Facility for Behaviour and Cognition, University of Vienna, 4645 Grünau im Almtal, Austria; Max Planck Institute for Ornithology, 82319 Seewiesen, Germany
| | - Alfredo Attisano
- Museum and Institute of Zoology, Polish Academy of Sciences, 00-679 Warsaw, Poland
| | - Adrian Craig
- Department of Zoology and Entomology, Rhodes University, Makhanda 6140, South Africa
| | - Pietro B D'Amelio
- FitzPatrick Institute of African Ornithology, University of Cape Town, Rondebosch 7701, South Africa
| | - Roman Gula
- Museum and Institute of Zoology, Polish Academy of Sciences, 00-679 Warsaw, Poland
| | - Alan T K Lee
- FitzPatrick Institute of African Ornithology, University of Cape Town, Rondebosch 7701, South Africa; Centre for Functional Biodiversity, School of Life Sciences, University of KwaZulu-Natal, Scottsville 3209, South Africa; BirdLife South Africa, Pinegowrie 2123, South Africa
| | - Lucía Mentesana
- Max Planck Institute for Ornithology, 82319 Seewiesen, Germany
| | - Petra Quillfeldt
- Department of Animal Ecology and Systematics, Justus Liebig University Giessen, 35392 Giessen, Germany
| | - Veronica Quirici
- Centro de Investigación para la Sustentabilidad, Facultad de Ciencias de la Vida, Universidad Andres Bello, 8370251 Santiago, Chile
| | - René Quispe
- Department of Marine Biology, Faculty of Ocean Sciences, Universidad Catolica del Norte, 1781421 Coquimbo, Chile; Department of Animal Biological Sciences, Faculty of Veterinary Sciences, University of Chile, 8820808 Santiago, Chile
| | - Rodrigo A Vásquez
- Institute of Ecology and Biodiversity, Department of Ecological Sciences, Faculty of Sciences, University of Chile, 7800003 Santiago, Chile; Cape Horn International Center (CHIC), Puerto Williams, Magallanes, Chile
| | - John C Wingfield
- Department of Neurobiology, Physiology, and Behavior, University of California, Davis, CA 95616, USA
| | - Juan F Masello
- Department of Animal Ecology and Systematics, Justus Liebig University Giessen, 35392 Giessen, Germany.
| |
Collapse
|
8
|
Fortuna R, D'Amelio PB, Doutrelant C, Ferreira AC, Lecq C, Silva LR, Covas R, Rybak F, Paquet M. Begging and feeding responses vary with relatedness and sex of provisioners in a cooperative breeder. Anim Behav 2022. [DOI: 10.1016/j.anbehav.2021.12.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
9
|
Covas R, Lardy S, Silva LR, Rey B, Ferreira AC, Theron F, Tognetti A, Faivre B, Doutrelant C. The oxidative cost of helping and its minimization in a cooperative breeder. Behav Ecol 2022. [DOI: 10.1093/beheco/arab152] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Abstract
Cooperative actions are beneficial to the group, but presumably costly to the individual co-operators. In cooperatively breeding species, helping to raise young is thought to involve important energetic costs, which could lead to elevated exposure to reactive oxygen species, resulting in oxidative stress. However, identifying such costs can be difficult if individuals adjust their investment in helping in relation to environmental conditions or their own physiological condition. Experimental approaches are therefore required to quantify the costs of helping but, to date, these have been infrequent. Here, we combined correlational and experimental data to investigate the oxidative cost of helping-at-the-nest and how this affects helping decisions in wild sociable weavers Philetairus socius, a colonial cooperatively breeding bird. At the correlational level, we found that the probability of helping was influenced by the interaction of an individual’s oxidative state and age: compared to younger birds, older individuals were more likely to help when they had higher oxidative damage, and the opposite trend was found for younger individuals. After experimentally increasing the energetic cost of flight, manipulated helpers in breeding colonies decreased nestling feeding rates and incurred an increase in oxidative damage, which was not present in manipulated helpers in non-breeding colonies. This indicates that individuals decreased their helping behavior to minimize the associated costs. These results suggest that oxidative stress can influence helping decisions and underlie a trade-off between cooperation and self-maintenance, which is central to understanding when helping might take place in this and other species.
Collapse
Affiliation(s)
- Rita Covas
- CIBIO-InBio, Centro de Investigação em Biodiversidade e Recursos Genéticos, Laboratório Associado, University of Porto, Campus Agrário de Vairão, 4485-661 Vairão, Portugal
- BIOPOLIS Program in Genomics, Biodiversity and Land Planning, CIBIO, Campus de Vairão, 4485-661 Vairão, Portugal
- FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, University of Cape Town, Rondebosch 7701, South Africa
| | - Sophie Lardy
- FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, University of Cape Town, Rondebosch 7701, South Africa
- Biogéosciences, CNRS UMR 6282, Université de Bourgogne Franche-Comté, 6 Bd Gabriel, 21000 Dijon, France
| | - Liliana R Silva
- CIBIO-InBio, Centro de Investigação em Biodiversidade e Recursos Genéticos, Laboratório Associado, University of Porto, Campus Agrário de Vairão, 4485-661 Vairão, Portugal
- BIOPOLIS Program in Genomics, Biodiversity and Land Planning, CIBIO, Campus de Vairão, 4485-661 Vairão, Portugal
| | - Benjamin Rey
- Université de Lyon, Université Lyon 1, CNRS, Laboratoire de Biométrie et Biologie Evolutive, UMR5558, F-69000 Villeurbanne, France
| | - André C Ferreira
- CIBIO-InBio, Centro de Investigação em Biodiversidade e Recursos Genéticos, Laboratório Associado, University of Porto, Campus Agrário de Vairão, 4485-661 Vairão, Portugal
- BIOPOLIS Program in Genomics, Biodiversity and Land Planning, CIBIO, Campus de Vairão, 4485-661 Vairão, Portugal
- Centre d’Ecologie Fonctionnelle et Evolutive, Univ Montpellier, CNRS, EPHE, IRD, Univ Paul-Valery Montpellier 3, Montpellier, France
| | - Franck Theron
- CIBIO-InBio, Centro de Investigação em Biodiversidade e Recursos Genéticos, Laboratório Associado, University of Porto, Campus Agrário de Vairão, 4485-661 Vairão, Portugal
- BIOPOLIS Program in Genomics, Biodiversity and Land Planning, CIBIO, Campus de Vairão, 4485-661 Vairão, Portugal
- Centre d’Ecologie Fonctionnelle et Evolutive, Univ Montpellier, CNRS, EPHE, IRD, Univ Paul-Valery Montpellier 3, Montpellier, France
| | - Arnaud Tognetti
- Institute for Advanced Study in Toulouse, 1, esplanade de l’Université, 31080 Toulouse Cedex 06, France
- Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Bruno Faivre
- Biogéosciences, CNRS UMR 6282, Université de Bourgogne Franche-Comté, 6 Bd Gabriel, 21000 Dijon, France
| | - Claire Doutrelant
- FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, University of Cape Town, Rondebosch 7701, South Africa
- Centre d’Ecologie Fonctionnelle et Evolutive, Univ Montpellier, CNRS, EPHE, IRD, Univ Paul-Valery Montpellier 3, Montpellier, France
| |
Collapse
|
10
|
Antioxidant capacity differs across social ranks and with ascension in males of a group-living fish. Comp Biochem Physiol A Mol Integr Physiol 2021; 265:111126. [PMID: 34906630 DOI: 10.1016/j.cbpa.2021.111126] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Revised: 12/07/2021] [Accepted: 12/07/2021] [Indexed: 01/04/2023]
Abstract
Animals that live in groups often form hierarchies in which an individual's behaviour and physiology varies based on their social rank. Occasionally, a subordinate can ascend into a dominant position and the ascending individual must make rapid behavioural and physiological adjustments to solidify their dominance. These periods of social transition and instability can be stressful and ascending individuals often incur large metabolic costs that could influence their oxidative status. Most previous investigations examining the link between oxidative status and the social environment have done so under stable social conditions and have evaluated oxidative status in a single tissue. Therefore, evaluations of how oxidative status is regulated across multiple tissues during periods of social flux would greatly enhance our understanding of the relationship between oxidative status and the social environment. Here, we assessed how antioxidant capacity in three tissues (brain, gonad, and muscle) varied among dominant, subordinate, and ascending males of the group-living cichlid fish, Neolamprologus pulcher. Antioxidant capacity in the brain and muscle of ascending males was intermediate to that of dominant (highest levels) and subordinate males (lowest levels) and correlated with differences in social and locomotor behaviours, respectively. Gonad antioxidant capacity was lower in ascending males than in dominant males. However, gonad antioxidant capacity was positively correlated with the size of ascending males' gonads suggesting that ascending males may increase gonad antioxidant capacity as they develop their gonads. Overall, our results highlight the widespread physiological consequences of social ascension and emphasize the importance of tissue-specific measures of oxidative status.
Collapse
|
11
|
D'Amelio PB, Ferreira AC, Fortuna R, Paquet M, Silva LR, Theron F, Doutrelant C, Covas R. Disentangling climatic and nest predator impact on reproductive output reveals adverse high-temperature effects regardless of helper number in an arid-region cooperative bird. Ecol Lett 2021; 25:151-162. [PMID: 34787354 PMCID: PMC9299450 DOI: 10.1111/ele.13913] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Revised: 08/04/2021] [Accepted: 09/29/2021] [Indexed: 01/20/2023]
Abstract
Climate exerts a major influence on reproductive processes, and an understanding of the mechanisms involved and which factors might mitigate adverse weather is fundamental under the ongoing climate change. Here, we study how weather and nest predation influence reproductive output in a social species, and examine whether larger group sizes can mitigate the adverse effects of these factors. We used a 7‐year nest predator‐exclusion experiment on an arid‐region cooperatively breeding bird, the sociable weaver. We found that dry and, especially, hot weather were major drivers of nestling mortality through their influence on nest predation. However, when we experimentally excluded nest predators, these conditions were still strongly associated with nestling mortality. Group size was unimportant against nest predation and, although positively associated with reproductive success, it did not mitigate the effects of adverse weather. Hence, cooperative breeding might have a limited capacity to mitigate extreme weather effects.
Collapse
Affiliation(s)
- Pietro B D'Amelio
- FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, University of Cape Town, Rondebosch, 7701, South Africa.,Centre d'Ecologie Fonctionnelle et Evolutive, CEFE, CNRS, Univ Montpellier, EPHE, IRD, Montpellier, 34293, France
| | - André C Ferreira
- Centre d'Ecologie Fonctionnelle et Evolutive, CEFE, CNRS, Univ Montpellier, EPHE, IRD, Montpellier, 34293, France.,BIOPOLIS Program in Genomics, Biodiversity and Land Planning, CIBIO, Vairão, 4485-661, Portugal.,CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO Laboratório Associado, Campus de Vairão, Universidade do Porto, Vairão, 4485-661, Portugal
| | - Rita Fortuna
- BIOPOLIS Program in Genomics, Biodiversity and Land Planning, CIBIO, Vairão, 4485-661, Portugal.,CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO Laboratório Associado, Campus de Vairão, Universidade do Porto, Vairão, 4485-661, Portugal.,Departamento de Biologia, Faculdade de Ciências, Universidade do Porto, 4099-002, Porto, Portugal
| | - Matthieu Paquet
- Department of Ecology, Swedish University of Agricultural Sciences, Uppsala, SE-75007, Sweden
| | - Liliana R Silva
- BIOPOLIS Program in Genomics, Biodiversity and Land Planning, CIBIO, Vairão, 4485-661, Portugal.,CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO Laboratório Associado, Campus de Vairão, Universidade do Porto, Vairão, 4485-661, Portugal
| | - Franck Theron
- Centre d'Ecologie Fonctionnelle et Evolutive, CEFE, CNRS, Univ Montpellier, EPHE, IRD, Montpellier, 34293, France.,BIOPOLIS Program in Genomics, Biodiversity and Land Planning, CIBIO, Vairão, 4485-661, Portugal.,CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO Laboratório Associado, Campus de Vairão, Universidade do Porto, Vairão, 4485-661, Portugal
| | - Claire Doutrelant
- FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, University of Cape Town, Rondebosch, 7701, South Africa.,Centre d'Ecologie Fonctionnelle et Evolutive, CEFE, CNRS, Univ Montpellier, EPHE, IRD, Montpellier, 34293, France
| | - Rita Covas
- FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, University of Cape Town, Rondebosch, 7701, South Africa.,BIOPOLIS Program in Genomics, Biodiversity and Land Planning, CIBIO, Vairão, 4485-661, Portugal.,CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO Laboratório Associado, Campus de Vairão, Universidade do Porto, Vairão, 4485-661, Portugal
| |
Collapse
|
12
|
Border SE, Piefke TJ, Funnell TR, Fialkowski RF, Sawecki J, Dijkstra PD. Social instability influences rank-specific patterns of oxidative stress in a cichlid fish. J Exp Biol 2021; 224:272109. [PMID: 34495308 DOI: 10.1242/jeb.237172] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2020] [Accepted: 09/01/2021] [Indexed: 01/13/2023]
Abstract
In many animal societies, dominant individuals have priority access to resources. However, defending high rank can be costly, especially in unstable social hierarchies where there is more intense competition. Oxidative stress has been proposed as a potential cost of social dominance, but few studies have examined this cost in relation to social stability. We studied the cost of social dominance in the cichlid fish Astatotilapia burtoni by manipulating social stability among males in replicate naturalistic communities for 22 weeks. We found that our social stability treatment influenced status-specific patterns in 3 out of 6 measurements of oxidative stress. Specifically, dominant males experienced increased plasma oxidative damage (measured as reactive oxygen metabolites, ROMs) compared with subordinate males in stable hierarchies only. Subordinate males in unstable hierarchies had higher ROMs than their stable community counterparts, but we found no effect of social stability treatment for dominant males. However, dominant males tended to have reduced total antioxidant capacity (TAC) in the liver when compared with subordinate males in unstable hierarchies, suggesting that the cost of social dominance is higher in unstable hierarchies. There were no effects of status and treatment on gonad TAC, muscle TAC or oxidative DNA damage. We conclude that the stability of the social environment influences the relative cost of social dominance in a tissue- and marker-specific manner.
Collapse
Affiliation(s)
- Shana E Border
- Central Michigan University, Department of Biology, Mount Pleasant, MI 48859, USA.,School of Biological Sciences, Illinois State University, Normal, IL 61790, USA
| | - Taylor J Piefke
- Central Michigan University, Department of Biology, Mount Pleasant, MI 48859, USA
| | - Tyler R Funnell
- Central Michigan University, Department of Biology, Mount Pleasant, MI 48859, USA.,Department of Fisheries and Wildlife, Michigan State University, East Lansing, MI 48824, USA
| | - Robert F Fialkowski
- Central Michigan University, Department of Biology, Mount Pleasant, MI 48859, USA
| | - Jacob Sawecki
- Central Michigan University, Department of Biology, Mount Pleasant, MI 48859, USA.,Department of Fisheries and Wildlife, Michigan State University, East Lansing, MI 48824, USA
| | - Peter D Dijkstra
- Central Michigan University, Department of Biology, Mount Pleasant, MI 48859, USA.,Neuroscience Program, Central Michigan University, Mount Pleasant, MI 48859, USA.,Institute for Great Lakes Research, Central Michigan University, Mount Pleasant, MI 48859, USA
| |
Collapse
|
13
|
Funnell TR, Fialkowski RJ, Dijkstra PD. Social dominance does not increase oxidative stress in a female dominance hierarchy of an African cichlid fish. Ethology 2021. [DOI: 10.1111/eth.13232] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Tyler R. Funnell
- Department of Biology Central Michigan University Mount Pleasant MI USA
- Quantitative Fisheries Center Department of Fisheries and Wildlife Michigan State University East Lansing MI USA
| | | | - Peter D. Dijkstra
- Department of Biology Central Michigan University Mount Pleasant MI USA
- Neuroscience Program Central Michigan University Mount Pleasant MI USA
- Institute for Great Lakes Research Central Michigan University Mount Pleasant MI USA
| |
Collapse
|
14
|
Robertson JK, Mastromonaco GF, Burness G. Social hierarchy reveals thermoregulatory trade-offs in response to repeated stressors. J Exp Biol 2020; 223:jeb229047. [PMID: 32967999 DOI: 10.1242/jeb.229047] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Accepted: 09/09/2020] [Indexed: 11/20/2022]
Abstract
Coping with stressors can require substantial energetic investment, and when resources are limited, such investment can preclude simultaneous expenditure on other biological processes. Among endotherms, energetic demands of thermoregulation can also be immense, yet our understanding of whether a stress response is sufficient to induce changes in thermoregulatory investment is limited. Using the black-capped chickadee as a model species, we tested a hypothesis that stress-induced changes in surface temperature (Ts), a well-documented phenomenon across vertebrates, stem from trade-offs between thermoregulation and stress responsiveness. Because social subordination is known to constrain access to resources in this species, we predicted that Ts and dry heat loss of social subordinates, but not social dominants, would fall under stress exposure at low ambient temperatures (Ta), and rise under stress exposure at high Ta, thus permitting a reduction in total energetic expenditure toward thermoregulation. To test our predictions, we exposed four social groups of chickadees to repeated stressors and control conditions across a Ta gradient (n=30 days/treatment/group), whilst remotely monitoring social interactions and Ts Supporting our hypothesis, we show that: (1) social subordinates (n=12), who fed less than social dominants and alone experienced stress-induced mass-loss, displayed significantly larger changes in Ts following stress exposure than social dominants (n=8), and (2) stress-induced changes in Ts significantly increased heat conservation at low Ta and heat dissipation at high Ta among social subordinates alone. These results suggest that chickadees adjust their thermoregulatory strategies during stress exposure when resources are limited by ecologically relevant processes.
Collapse
Affiliation(s)
- Joshua K Robertson
- Environmental and Life Sciences Graduate Program, Trent University, Peterborough, ON, Canada K9L 0G2
- Department of Wildlife and Science, Toronto Zoo, Scarborough, ON, Canada M1B 5K7
| | | | - Gary Burness
- Department of Biology, Trent University, Peterborough, ON, Canada K9L 0G2
| |
Collapse
|
15
|
Ferreira AC, Covas R, Silva LR, Esteves SC, Duarte IF, Fortuna R, Theron F, Doutrelant C, Farine DR. How to make methodological decisions when inferring social networks. Ecol Evol 2020; 10:9132-9143. [PMID: 32953051 PMCID: PMC7487238 DOI: 10.1002/ece3.6568] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Accepted: 06/17/2020] [Indexed: 11/06/2022] Open
Abstract
Social network analyses allow studying the processes underlying the associations between individuals and the consequences of those associations. Constructing and analyzing social networks can be challenging, especially when designing new studies as researchers are confronted with decisions about how to collect data and construct networks, and the answers are not always straightforward. The current lack of guidance on building a social network for a new study system might lead researchers to try several different methods and risk generating false results arising from multiple hypotheses testing. Here, we suggest an approach for making decisions when starting social network research in a new study system that avoids the pitfall of multiple hypotheses testing. We argue that best edge definition for a network is a decision that can be made using a priori knowledge about the species and that is independent from the hypotheses that the network will ultimately be used to evaluate. We illustrate this approach with a study conducted on a colonial cooperatively breeding bird, the sociable weaver. We first identified two ways of collecting data using different numbers of feeders and three ways to define associations among birds. We then evaluated which combination of data collection and association definition maximized (a) the assortment of individuals into previously known "breeding groups" (birds that contribute toward the same nest and maintain cohesion when foraging) and (b) socially differentiated relationships (more strong and weak relationships than expected by chance). This evaluation of different methods based on a priori knowledge of the study species can be implemented in a diverse array of study systems and makes the case for using existing, biologically meaningful knowledge about a system to help navigate the myriad of methodological decisions about data collection and network inference.
Collapse
Affiliation(s)
- André C. Ferreira
- Centre d’Ecologie Fonctionnelle et EvolutiveUniv MontpellierCNRSEPHE, IRDUniv Paul‐Valery Montpellier 3MontpellierFrance
- CIBIO‐InBioResearch Centre in Biodiversity and Genetic ResourcesVairãoPortugal
- Department of Collective BehaviorMax Planck Institute of Animal BehaviorKonstanzGermany
| | - Rita Covas
- CIBIO‐InBioResearch Centre in Biodiversity and Genetic ResourcesVairãoPortugal
- FitzPatrick Institute of African OrnithologyDST‐NRF Centre of ExcellenceUniversity of Cape TownRondeboschSouth Africa
| | - Liliana R. Silva
- CIBIO‐InBioResearch Centre in Biodiversity and Genetic ResourcesVairãoPortugal
| | - Sandra C. Esteves
- CIBIO‐InBioResearch Centre in Biodiversity and Genetic ResourcesVairãoPortugal
| | - Inês F. Duarte
- CIBIO‐InBioResearch Centre in Biodiversity and Genetic ResourcesVairãoPortugal
| | - Rita Fortuna
- CIBIO‐InBioResearch Centre in Biodiversity and Genetic ResourcesVairãoPortugal
| | - Franck Theron
- Centre d’Ecologie Fonctionnelle et EvolutiveUniv MontpellierCNRSEPHE, IRDUniv Paul‐Valery Montpellier 3MontpellierFrance
| | - Claire Doutrelant
- Centre d’Ecologie Fonctionnelle et EvolutiveUniv MontpellierCNRSEPHE, IRDUniv Paul‐Valery Montpellier 3MontpellierFrance
- FitzPatrick Institute of African OrnithologyDST‐NRF Centre of ExcellenceUniversity of Cape TownRondeboschSouth Africa
| | - Damien R. Farine
- Department of Collective BehaviorMax Planck Institute of Animal BehaviorKonstanzGermany
- Department of BiologyUniversity of KonstanzKonstanzGermany
- Centre for the Advanced Study of Collective BehaviourUniversity of KonstanzKonstanzGermany
| |
Collapse
|
16
|
Strauss ED, Shizuka D, Holekamp KE. Juvenile rank acquisition is associated with fitness independent of adult rank. Proc Biol Sci 2020; 287:20192969. [PMID: 32126950 DOI: 10.1098/rspb.2019.2969] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Social rank is a significant determinant of fitness in a variety of species. The importance of social rank suggests that the process by which juveniles come to establish their position in the social hierarchy is a critical component of development. Here, we use the highly predictable process of rank acquisition in spotted hyenas to study the consequences of variation in rank acquisition in early life. In spotted hyenas, rank is 'inherited' through a learning process called 'maternal rank inheritance.' This pattern is very consistent: approximately 80% of juveniles acquire the exact rank expected under the rules of maternal rank inheritance. The predictable nature of rank acquisition in these societies allows the process of rank acquisition to be studied independently from the ultimate rank that each juvenile attains. In this study, we use Elo-deviance scores, a novel application of the Elo-rating method, to calculate each juvenile's deviation from the expected pattern of maternal rank inheritance during development. Despite variability in rank acquisition among juveniles, most of these juveniles come to attain the exact rank expected of them according to the rules of maternal rank inheritance. Nevertheless, we find that transient variation in rank acquisition in early life is associated with long-term fitness consequences for these individuals: juveniles 'underperforming' their expected ranks show reduced survival and lower lifetime reproductive success than better-performing peers, and this relationship is independent of both maternal rank and rank achieved in adulthood. We also find that multiple sources of early life adversity have cumulative, but not compounding, effects on fitness. Future work is needed to determine if variation in rank acquisition directly affects fitness, or if some other variable, such as maternal investment or juvenile condition, causes variation in both of these outcomes.
Collapse
Affiliation(s)
- Eli D Strauss
- Department of Integrative Biology, Michigan State University, East Lansing, MI, USA.,Program in Ecology, Evolutionary Biology, and Behavior, Michigan State University, East Lansing, MI, USA.,BEACON Center for the Study of Evolution in Action, Michigan State University, East Lansing, MI, USA.,School of Biological Sciences, University of Nebraska-Lincoln, Lincoln, NE, USA
| | - Daizaburo Shizuka
- School of Biological Sciences, University of Nebraska-Lincoln, Lincoln, NE, USA
| | - Kay E Holekamp
- Department of Integrative Biology, Michigan State University, East Lansing, MI, USA.,Program in Ecology, Evolutionary Biology, and Behavior, Michigan State University, East Lansing, MI, USA.,BEACON Center for the Study of Evolution in Action, Michigan State University, East Lansing, MI, USA
| |
Collapse
|
17
|
Antioxidant capacity is repeatable across years but does not consistently correlate with a marker of peroxidation in a free-living passerine bird. J Comp Physiol B 2019; 189:283-298. [DOI: 10.1007/s00360-019-01211-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Revised: 01/22/2019] [Accepted: 03/01/2019] [Indexed: 02/06/2023]
|