Alena Lemazina, Lisa Trost, Manfred Gahr, Susanne Hoffmann
{"title":"The multifaceted vocal duets of white-browed sparrow weavers are based on complex duetting rules","authors":"Alena Lemazina, Lisa Trost, Manfred Gahr, Susanne Hoffmann","doi":"10.1111/jav.02703","DOIUrl":"https://doi.org/10.1111/jav.02703","url":null,"abstract":"<p>In some bird species, mated pairs sing duet songs for pair bond maintenance and joint territory defense. Duet partners often follow specific duetting rules, such as answering rules and duet codes, to construct their duet songs. Previous studies mainly concentrated on species that repeat particular phrase pairings during duetting. Our study aims to add to the comparative aspect of duetting research by investigating duet structure in songs of white-browed sparrow weavers <i>Plocepasser mahali</i>, a songbird species that does not repeat the same type of vocalization but switches between different types of vocal elements within one duet song. We used lightweight radio-telemetric microphone transmitters to record the vocal activity in both individuals of duetting pairs simultaneously. This technique enabled us not only to investigate duetting behavior in naturally behaving animals, but also to assign each vocalization to the respective individual while maintaining the precise temporal relationship between the vocalizations of both partners. Our data reveal that although white-browed sparrow weavers share a large part of their sex-specific vocal repertoires with same-sex birds of other pairs, duetting partners adhere to pair-specific answering rules to generate their highly complex duet songs. Moreover, partners can combine answering rules into consistent duet trains. Duet trains generally represent only the core of the duet songs, while at the beginning and the end of duet songs, partners arrange their vocalization types more flexibly. In addition to completely pair-specific duet trains, duet trains of white-browed sparrow weaver pairs can include subsequences that are shared between different pairs. The sharing pattern we find in this species suggests that in combination to pair-specific duetting rules, mated pairs use duetting rules that have been acquired prior to pair formation.</p>","PeriodicalId":15278,"journal":{"name":"Journal of Avian Biology","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2021-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1111/jav.02703","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137556366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Compensatory effect of egg size dimorphism on hatching asynchrony in Magellanic penguin","authors":"Nahuel Marchisio, Melina Barrionuevo, Esteban Frere","doi":"10.1111/jav.02673","DOIUrl":"https://doi.org/10.1111/jav.02673","url":null,"abstract":"<p>Egg laying is one of the most important phases in a female bird's breeding cycle. Its cost is high because eggs contain all the resources needed for the development of an embryo. Variation in size and quality of eggs can have important long-term consequences for offspring survival. Hatching asynchrony is known to influence sibling competition in many bird species. Last-hatched chicks will have a competitive disadvantage throughout the pre-fledgling period because they are smaller. The aim of this study was to analyze the effect of hatching asynchrony and egg size variation on the growth and fledging success of Magellanic penguin <i>Spheniscus magellanicus</i> chicks after disentangling the effects of parental condition. We simultaneously manipulated egg size dimorphism, hatching asynchrony and parental condition by performing a cross-fostering experiment, creating broods with controlled egg size dimorphism and hatching asynchrony in a colony of Magellanic penguins located in Isla Quiroga, Santa Cruz, Argentina. We found that hatching asynchrony had a negative effect on last-hatched chicks, but this disadvantage was mitigated by egg size dimorphism in their favor. Moreover, females in good condition invest more in second than in first chicks, which, added to a greater investment by foster fathers, leading to offspring fledging in good condition. On the contrary, for the first-hatched chicks, we found that body condition of the biological father was an important factor for their growth. We conclude that raising more than one chick seems to be a decision based on parental condition throughout the breeding season.</p>","PeriodicalId":15278,"journal":{"name":"Journal of Avian Biology","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2021-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1111/jav.02673","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137565617","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Cristina Rueda-Uribe, Ulrik Lötberg, Maria Ericsson, Sylvie V. M. Tesson, Susanne Åkesson
{"title":"First tracking of declining Caspian terns Hydroprogne caspia breeding in the Baltic Sea reveals high migratory dispersion and disjunct annual ranges as obstacles to effective conservation","authors":"Cristina Rueda-Uribe, Ulrik Lötberg, Maria Ericsson, Sylvie V. M. Tesson, Susanne Åkesson","doi":"10.1111/jav.02743","DOIUrl":"https://doi.org/10.1111/jav.02743","url":null,"abstract":"<p>The conservation of migratory species poses significant challenges that may be countered by detailed knowledge about the sites used by migrants throughout the annual cycle. We present the first GPS-tracking data on the migration of declining Caspian terns <i>Hydroprogne caspia</i> breeding in the Baltic Sea. For 39 Caspian terns from colonies along a latitudinal gradient from 57 to 65°N, we identified key migratory routes, stopovers and wintering areas. In autumn these seabirds migrated using coastal and freshwater stopovers along six routes to reach their wintering areas across the Sahel, the Nile River Basin and the southern Iberian Peninsula. In spring, adults returned to the breeding grounds in the Baltic using a time optimizing strategy by reducing time at stopover by 78%, whereas most subadults remained sedentary and some performed only partial return migrations. Of the stopover sites used in both seasons, 58% are protected and have a reported management plan. Conservation strategies in wintering areas, stopover sites that are not protected or had not been previously recognized, and the inclusion of the species in important migratory flyways across Europe and Africa will be important to prevent further population declines of a species that depends on aquatic habitats.</p>","PeriodicalId":15278,"journal":{"name":"Journal of Avian Biology","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2021-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1111/jav.02743","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137565614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Krista N. Oswald, Ben Smit, Alan T. K. Lee, Ceili L. Peng, Cameryn Brock, Susan J. Cunningham
{"title":"Higher temperatures are associated with reduced nestling body condition in a range-restricted mountain bird","authors":"Krista N. Oswald, Ben Smit, Alan T. K. Lee, Ceili L. Peng, Cameryn Brock, Susan J. Cunningham","doi":"10.1111/jav.02756","DOIUrl":"https://doi.org/10.1111/jav.02756","url":null,"abstract":"<p>Demonstrated negative effects of increased temperatures on avian reproductive success suggest a mechanism by which climate change may impact species persistence. High temperatures can result in reduced parental care and reduced nestling condition in passerines with dependent young, resulting in lowered fledging success and population recruitment. We examined provisioning rate and nestling condition in a South African mountain endemic, the Cape rockjumper <i>Chaetops frenatus</i>, whose population declines correlate with warming habitat. Our aim was to determine whether rockjumper reproductive success could be affected by high air temperatures. We set up video cameras on nests at three nestling age classes (≤ 7 days old; 8–12 days old; ≥ 13 days old) for 8 hours on 37 separate days. We successfully collected full-day footage on 25 of the 37 days (four days with predation, eight with equipment failure). Nestlings were weighed at the beginning and end of each film day, barring the four days with mid-day predation (n = 65 nestling measures from 33 of the 37 days). Average mass gain across all nestlings per nest was positively correlated with provisioning rate (0.78 g provisions<sup>−1</sup> hr<sup>−1</sup>, CI: 0.26–1.30), and provisioning rate decreased at increasing temperatures (−0.08 provisions hr<sup>−1</sup> °C<sup>−1</sup>, CI: −0.15 to −0.01). Daily change in mass of individual nestlings was negatively correlated with air temperatures above a significant temperature threshold (22.4°C; −0.30 g °C<sup>−1</sup>, CI: −0.40 to −0.19). This suggests nestling energy requirements were not being met on higher temperature days – perhaps because nestling energy and water demands for thermoregulation are elevated and provisioning rate is not correspondingly maintained or increased. These results suggest that higher temperatures negatively affect nestling mass gain. While in our study this did not directly affect fledging rates, it may affect post-fledging survival.</p>","PeriodicalId":15278,"journal":{"name":"Journal of Avian Biology","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2021-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1111/jav.02756","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137789970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Antonita Santana, Sofia Marques Silva, Nayron Francês Do Nascimento, Iracilda Sampaio, Alexandre Aleixo
{"title":"Phylogeography of the Dendrocolaptes picumnus (Aves: Dendrocolaptidae) species complex: new insights on the diversification of a trans-American lineage","authors":"Antonita Santana, Sofia Marques Silva, Nayron Francês Do Nascimento, Iracilda Sampaio, Alexandre Aleixo","doi":"10.1111/jav.02723","DOIUrl":"https://doi.org/10.1111/jav.02723","url":null,"abstract":"<p>Molecular studies have shown that many polytypic species of birds are paraphyletic and may actually consist of multiple independent species, some of them phenotypically cryptic. One of such cases is <i>Dendrocolaptes picumnus</i>, which was found to be a paraphyletic species, with <i>Dendrocolaptes hoffmannsi</i> nested in it. Recent evidence also showed that multiple independent evolutionary lineages exist in the polytypic <i>D. picumnus</i> that may be characterized as distinct species, however, conclusions were weakened due to small sample sizes. To further evaluate phylogenetic relationships, species limits, and the diversification history of the <i>D. picumnus</i> species complex, herein we performed the densest sampling ever registered for the complex, and analyzed sequences of mitochondrial and nuclear genes from 106 specimens, belonging to all but four taxa grouped in the complex. Our phylogenetic analyses confirmed the monophyly of <i>D. hoffmannsi</i> and <i>D. platyrostris</i>, as well as the paraphyly of the polytypic <i>D. picumnus</i>. A combination of coalescent and population genetic structure analyses further supported an evolutionary independent status for <i>D. picumnus transfasciatus</i>, but were ambiguous with respect to the statuses of nominate <i>D. picumnus</i>, <i>D. picumnus pallescens</i>, <i>D. picumnus validus</i>, and <i>D. picumnus costaricensis</i>. In contrast, <i>D. picumnus olivaceus</i> and <i>D. platyrostris intermedius</i> were polyphyletic and not genetically structured with respect to <i>D. picumnus pallescens</i> and <i>D. platyrostris platyrostris</i>, respectively. Our results did not support the monophyly of the previously defined ‘Amazonian' and ‘montane' subspecies groups of <i>D. picumnus</i>, further indicating that at least one ‘montane' taxon may actually belong to the ‘Chaco' group, a relationship that highlights a close historical connection between the Andean and Chacoan biotas. When interpreted together with previous morphological studies, our results support the split of the polytypic <i>D. picumnus</i> into at least two species, while keeping the status of <i>D. hoffmannsi</i> and <i>D. platyrostris</i> as distinct species.</p>","PeriodicalId":15278,"journal":{"name":"Journal of Avian Biology","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2021-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1111/jav.02723","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137953430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jordan Boersma, Douglas G. Barron, Daniel T. Baldassarre, Michael S. Webster, Hubert Schwabl
{"title":"Wildfire affects expression of male sexual plumage through suppressed testosterone circulation in a tropical songbird","authors":"Jordan Boersma, Douglas G. Barron, Daniel T. Baldassarre, Michael S. Webster, Hubert Schwabl","doi":"10.1111/jav.02757","DOIUrl":"https://doi.org/10.1111/jav.02757","url":null,"abstract":"<p>Natural disturbances like drought and wildfires are expected to increase in prevalence, so understanding how organisms are affected is a key goal for conservationists and biologists alike. While many studies have illustrated long-term effects of perturbations on survival and reproduction, little is known of short-term effects to physiology and sexual signal expression. Ornamental traits have been proposed as reliable indicators of environmental health, yet studies are lacking in the context of natural disturbances. Here we present short-term (7–65 days) responses of male red-backed fairywrens <i>Malurus melanocephalus</i> to wildfire near the onset of the typical breeding season. Young males of this species are characterized by plastic expression of sexual plumage phenotypes depending on circulating testosterone and body condition. Using two populations with fairywren captures before and after separate wildfires we illustrate that wildfire suppressed molt into ornamented plumage. Neither baseline plasma corticosterone or furcular fat stores were affected by fire. However, fire seemed to interfere with the termporal increase in plasma testosterone during the pre-breeding season, leading to a lower proportion of males molting into ornamented plumage. Collectively, these findings suggest that wildfires inhibit or greatly delay acquisition of ornamentation in males through enduring suppression of testosterone circulation.</p>","PeriodicalId":15278,"journal":{"name":"Journal of Avian Biology","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2021-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1111/jav.02757","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137955468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Zuzana Sejfová, Jiří Mlíkovský, Francis Luma Ewome, Petra Janečková, Yannick Klomberg, Marcus Mokake Njie, Štěpán Janeček
{"title":"Sunbirds' tendency to hover: the roles of energetic rewards, inflorescence architecture and rain","authors":"Zuzana Sejfová, Jiří Mlíkovský, Francis Luma Ewome, Petra Janečková, Yannick Klomberg, Marcus Mokake Njie, Štěpán Janeček","doi":"10.1111/jav.02818","DOIUrl":"https://doi.org/10.1111/jav.02818","url":null,"abstract":"<p>Although the Old World sunbirds are generally considered to be an ecological analogue of the New World hummingbirds, it is commonly believed that in contrast to hummingbirds, sunbirds perch while feeding. Nevertheless, recent studies have shown that Old World nectarivores hover while feeding more frequently than previously thought, and some Old World plants seem to have adapted to hovering bird pollinators. To reveal the importance of sunbird foraging behavior in nectar acquisition and to test whether this behavior is determined by plant architecture and rain intensity, we focused on the specialized West African pollination system of <i>Impatiens sakeriana</i> and its two major pollinators, the Cameroon sunbird <i>Cyanomitra oritis</i> and the northern double-collared sunbird <i>Cinnyris reichenowi</i>. <i>C. oritis</i> hovered more often than <i>C. reichenowi</i> while feeding on flowers, although both species were observed hovering regularly. For both species, hovering reduced the feeding time, but this reduction and the consequent estimated changes in energetic intake were species-specific. We found that both floral pedicel and peduncle length, as well as precipitation, negatively affected the probability of <i>C. reichenowi</i> hovering but did not have any significant effect on the behavior of <i>C. oritis</i>. Our study demonstrates that hovering behavior is common in the studied sunbird taxa and that plant architecture and environmental factors can influence sunbird foraging behavior. Nevertheless, the extent of hovering versus perching behavior, as well as the effects of biotic and abiotic factors, is species-specific.</p>","PeriodicalId":15278,"journal":{"name":"Journal of Avian Biology","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2021-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1111/jav.02818","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137954549","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. Duckworth, S. O'Brien, I. K. Petersen, A. Petersen, G. Benediktsson, L. Johnson, P. Lehikoinen, D. Okill, R. Väisänen, J. Williams, S. Williams, F. Daunt, J. A. Green
{"title":"Spatial and temporal variation in foraging of breeding red-throated divers","authors":"J. Duckworth, S. O'Brien, I. K. Petersen, A. Petersen, G. Benediktsson, L. Johnson, P. Lehikoinen, D. Okill, R. Väisänen, J. Williams, S. Williams, F. Daunt, J. A. Green","doi":"10.1111/jav.02702","DOIUrl":"https://doi.org/10.1111/jav.02702","url":null,"abstract":"<p>Differing environmental conditions can have profound effects on many behaviours in animals, especially where species have large geographic ranges. Seasonal changes or progression through life history stages impose differential constraints, leading to changes in behaviours. Furthermore, species which show flexibility in behaviours, may have a higher capacity to adapt to anthropogenic-induced changes to their environment. The red-throated diver (RTD) is an aquatic bird, that is able to forage in both freshwater and marine environments, though little else is known about its behaviours and its capacity to adapt to different environmental conditions. Here, we use time-depth recorders and saltwater immersion loggers to examine the foraging behaviour of RTDs from three regions across northwest Europe. We found that in the breeding season, birds from two regions (Iceland and Scotland) foraged in the marine environment, while birds from Finland, foraged predominantly in freshwater. Most of the differences in diving characteristics were at least partly explained by differences in foraging habitat. Additionally, while time spent foraging did not change through the breeding season, dives generally became more pelagic and less benthic over the season, suggesting RTDs either switched prey or followed vertical prey movements, rather than increasing foraging effort. There was a preference for foraging in daylight over crepuscular hours, with a stronger effect at two of the three sites. Overall, we provide the first investigation of RTD foraging and diving behaviour from multiple geographic regions and demonstrate variation in foraging strategies in this generalist aquatic predator, most likely due to differences in their local environment.</p>","PeriodicalId":15278,"journal":{"name":"Journal of Avian Biology","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2021-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1111/jav.02702","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137970709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Acoustic, genetic and morphological analyses of the Canarian common chaffinch complex Fringilla coelebs ssp. reveals cryptic diversification","authors":"","doi":"10.1111/jav.02780","DOIUrl":"https://doi.org/10.1111/jav.02780","url":null,"abstract":"<p>The authors of Illera et al. (2018) have inadvertently omitted the Zoobank accession code for the new subspecies proposed when the article was originally published, despite having obtained it before the article had been accepted. The Zoobank Life Sciences Id for the new subspecies is urn:lsid:zoobank.org:pub:A2DB5346-D4C9-4D25-A731-C1EC3495AC9A.</p>","PeriodicalId":15278,"journal":{"name":"Journal of Avian Biology","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2021-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1111/jav.02780","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"92307394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Krista N. Oswald, B. Smit, Alan T. K. Lee, Ceili L. Peng, Cameryn Brock, S. Cunningham
{"title":"Decision letter for \"Higher temperatures are associated with reduced nestling body condition in a range‐restricted mountain bird\"","authors":"Krista N. Oswald, B. Smit, Alan T. K. Lee, Ceili L. Peng, Cameryn Brock, S. Cunningham","doi":"10.1111/jav.02756/v3/decision1","DOIUrl":"https://doi.org/10.1111/jav.02756/v3/decision1","url":null,"abstract":"2 2 : e02756 Demonstrated negative effects of increased temperatures on avian reproductive success suggest a mechanism by which climate change may impact species persistence. High temperatures can result in reduced parental care and reduced nestling condition in passerines with dependent young, resulting in lowered fledging success and population recruitment. We examined provisioning rate and nestling condition in a South African mountain endemic, the Cape rockjumper Chaetops frenatus, whose population declines correlate with warming habitat. Our aim was to determine whether rockjumper reproductive success could be affected by high air temperatures. We set up video cameras on nests at three nestling age classes (≤ 7 days old; 8–12 days old; ≥ 13 days old) for 8 hours on 37 separate days. We successfully collected full-day footage on 25 of the 37 days (four days with predation, eight with equipment failure). Nestlings were weighed at the beginning and end of each film day, barring the four days with mid-day predation (n = 65 nestling measures from 33 of the 37 days). Average mass gain across all nestlings per nest was positively correlated with provisioning rate (0.78 g provisions−1 hr−1, CI: 0.26–1.30), and provisioning rate decreased at increasing temperatures (−0.08 provisions hr−1 °C−1, CI: −0.15 to −0.01). Daily change in mass of individual nestlings was negatively correlated with air temperatures above a significant temperature threshold (22.4°C; −0.30 g °C−1, CI: −0.40 to −0.19). This suggests nestling energy requirements were not being met on higher temperature days – perhaps because nestling energy and water demands for thermoregulation are elevated and provisioning rate is not correspondingly maintained or increased. These results suggest that higher temperatures negatively affect nestling mass gain. While in our study this did not directly affect fledging rates, it may affect post-fledging survival.","PeriodicalId":15278,"journal":{"name":"Journal of Avian Biology","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2021-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"63399377","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}