Journal of Ornithology最新文献

{"title":"Seasonal dynamics of female bill colouration: an observation in captive House Sparrows (<i>Passer domesticus</i>).","authors":"Anastasia Caluja, Sebastian G Vetter-Lang, Lisamarie Lehner, Katharina Mahr","doi":"10.1007/s10336-025-02326-9","DOIUrl":"https://doi.org/10.1007/s10336-025-02326-9","url":null,"abstract":"<p><p>Bill colouration is a highly variable trait with the potential to rapidly change over time. We observed strong interindividual and seasonal variation in the bill colour of captive female House Sparrows (<i>Passer domesticus</i>) and describe two colour traits by using a simple categorization: i) the presence or absence of yellow markings on the upper mandible and ii) whether the female bill is light horn-coloured or dark brown. In spring, females display either light horn-coloured or dark, almost black, bills and half of the birds have yellow markings on the upper mandible. However, this changes markedly when the birds start breeding. In our observation, after the first brood, the proportion of individuals with yellow markings was significantly lower and in none of the females that raised offspring this trait was present. However, during the non-reproductive period in autumn, the yellow pigmentation of the upper mandible became visible in all individuals. Furthermore, the proportion of females with light bills increased from pre-breeding to the non-reproductive stage. The distinct differences in bill colouration together with the seasonal changes may indicate a potential signalling function and might serve in sexual selection.</p>","PeriodicalId":55999,"journal":{"name":"Journal of Ornithology","volume":"167 2","pages":"593-597"},"PeriodicalIF":1.4,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12989020/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147470152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Heterophil-to-lymphocyte ratio varies with habitat fragmentation and canopy cover in a tropical understory insectivore.","authors":"Vincent Otieno Onyango, Magdalena Ginko, George Gatere Ndiritu, Laurence Cousseau, Janne Heiskanen, Gladys Nyakeru Kung U, Peter Njoroge, Mwangi Githiru, Petri Pellikka, Luc Lens, Beate Apfelbeck","doi":"10.1007/s10336-025-02321-0","DOIUrl":"https://doi.org/10.1007/s10336-025-02321-0","url":null,"abstract":"<p><p>Habitat fragmentation and degradation are major problems in tropical forests, leading to a decline in biodiversity. However, it is often unclear which aspects of habitat change are responsible for the decline of specific species. Physiological studies can help identify potential stressors and elucidate causal relationships between habitat change and species decline. In this study, we measured the heterophil-to-lymphocyte (H:L) ratio as an indicator of long-term physiological stress and ecological pressures, such as pathogen exposure or risk of injury, in the tropical understorey insectivore Cabanis's Greenbul (Placid) (<i>Phyllastrephus cabanisi placidus</i>). We then related this ratio to fragment size and forest degradation (canopy cover and vertical vegetation structure). Greenbuls breeding in forest areas with low canopy cover tend to have higher H:L ratios than those breeding in areas with high canopy cover, indicating that low canopy cover creates challenging conditions for greenbuls during breeding. Unexpectedly, however, greenbuls had higher H:L ratios in the largest, most intact forest fragment. These higher H:L ratios in larger fragments may reflect physiological and immunological adjustments to higher ecological pressures, such as predation, parasite prevalence, and competition for territories, due to intact trophic networks. This study therefore advocates concerted efforts to preserve large forest fragments, while smaller fragments should be rehabilitated to strengthen the ecological corridors and networks of these key biodiversity areas, which are of high conservation priority within the isolated mountain peaks of the Taita Hills in Kenya.</p><p><strong>Supplementary information: </strong>The online version contains supplementary material available at 10.1007/s10336-025-02321-0.</p>","PeriodicalId":55999,"journal":{"name":"Journal of Ornithology","volume":"167 2","pages":"501-512"},"PeriodicalIF":1.4,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12988911/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147469930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Aggressive behavior as a predictor of home range size: findings from both range-restricted and widespread Darwin's finch species.","authors":"Jefferson García-Loor, Mario Gallego-Abenza, Andrew C Katsis, Verena Puehringer-Sturmayr, Diane Colombelli-Négrel, Çağlar Akçay, Sonia Kleindorfer","doi":"10.1007/s10336-024-02215-7","DOIUrl":"10.1007/s10336-024-02215-7","url":null,"abstract":"<p><p>Information about an animal's home range (the geographical area in which it accesses resources for survival and reproduction) is vital broadly for understanding animal behavior and specifically for developing conservation management plans. Although personality traits-consistent individual differences in behavior across time and contexts-may affect an animal's home range size, we still lack a breadth of empirical studies across systems to fully appreciate this influence. Here, we tested the relationship between behavioral responses and home range size in two Darwin's finch species on Floreana Island: the critically endangered and range-restricted Medium Tree Finch (<i>Camarhynchus pauper</i>) and the common and widespread Small Ground Finch (<i>Geospiza fuliginosa</i>). Using a combination of rapid-assessment assays during both short-term captivity and in the field, we measured exploration and aggressiveness in males from both species. We then used radio telemetry to measure each bird's home range size over a week-long period. We predicted that (1) fast-exploring individuals would have larger home ranges, and (2) more aggressive individuals would have smaller home ranges. We found that Medium Tree Finches had smaller home ranges than Small Ground Finches, that exploratory behavior was positively correlated with home range size only in Small Ground Finches, and that, in both species, individuals' aggressiveness was negatively correlated with home range size, whereby the more aggressive individuals occupied smaller home ranges. We conclude that behavioral responses that align with major personality traits can predict home range size, which may provide an important tool for the conservation and management of endangered species when, for example, selecting individuals with different personality profiles for reintroduction.</p><p><strong>Supplementary information: </strong>The online version contains supplementary material available at 10.1007/s10336-024-02215-7.</p>","PeriodicalId":55999,"journal":{"name":"Journal of Ornithology","volume":"166 1","pages":"247-261"},"PeriodicalIF":1.3,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11779779/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143082262","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nest survival of Crested Lark (Galerida cristata) in intensively used habitats in Central Poland","authors":"Rafał Sandecki, J. Kosicki","doi":"10.1007/s10336-024-02183-y","DOIUrl":"https://doi.org/10.1007/s10336-024-02183-y","url":null,"abstract":"","PeriodicalId":55999,"journal":{"name":"Journal of Ornithology","volume":"121 42","pages":""},"PeriodicalIF":1.3,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140977323","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Protecting breeding sites: a critical goal for the conservation of the golden eagle in Mexico under global change scenarios","authors":"Andrea M. Gama-Rodríguez, Juan A. García, Luis F. Lozano, David A. Prieto‐Torres","doi":"10.1007/s10336-024-02168-x","DOIUrl":"https://doi.org/10.1007/s10336-024-02168-x","url":null,"abstract":"","PeriodicalId":55999,"journal":{"name":"Journal of Ornithology","volume":"33 7","pages":""},"PeriodicalIF":1.3,"publicationDate":"2024-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140361590","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Rüppell’s Vulture (Gyps rueppelli): a new vulture species for Europe?","authors":"A. Onrubia, Carlos Torralvo, V. Morandini, Miguel Ferrer","doi":"10.1007/s10336-024-02160-5","DOIUrl":"https://doi.org/10.1007/s10336-024-02160-5","url":null,"abstract":"","PeriodicalId":55999,"journal":{"name":"Journal of Ornithology","volume":"29 21","pages":""},"PeriodicalIF":1.3,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140373889","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Does predation drive Chilean Elaenia (Elaenia chilensis) nest-site selection in the temperate forest of southern South America?","authors":"C. A. Gorosito, D. T. Tuero, V. R. Cueto","doi":"10.1007/s10336-024-02163-2","DOIUrl":"https://doi.org/10.1007/s10336-024-02163-2","url":null,"abstract":"","PeriodicalId":55999,"journal":{"name":"Journal of Ornithology","volume":" 31","pages":""},"PeriodicalIF":1.3,"publicationDate":"2024-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140216363","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Laying date depends on territorial breeders’ age, climatic conditions and previous breeding success: a long-term study (2004–2021) with Bonelli’s eagle in Spain","authors":"Andrés López-Peinado, P. López‐López","doi":"10.1007/s10336-024-02165-0","DOIUrl":"https://doi.org/10.1007/s10336-024-02165-0","url":null,"abstract":"","PeriodicalId":55999,"journal":{"name":"Journal of Ornithology","volume":" 6","pages":""},"PeriodicalIF":1.3,"publicationDate":"2024-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140218879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of winter weather conditions on abundance fluctuations in a nest box breeding population of the Common Merganser Mergus merganser in the southern coast of Finland","authors":"T. Solonen, Kimmo af Ursin","doi":"10.1007/s10336-024-02164-1","DOIUrl":"https://doi.org/10.1007/s10336-024-02164-1","url":null,"abstract":"","PeriodicalId":55999,"journal":{"name":"Journal of Ornithology","volume":" 19","pages":""},"PeriodicalIF":1.3,"publicationDate":"2024-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140216418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysing citizen science data to address the demographic expansion of the Eurasian Magpie (Pica pica) in southern Spain","authors":"Andrés de la Cruz, Abraham Morales, Yana Korneeva, Macarena Castro","doi":"10.1007/s10336-024-02154-3","DOIUrl":"https://doi.org/10.1007/s10336-024-02154-3","url":null,"abstract":"","PeriodicalId":55999,"journal":{"name":"Journal of Ornithology","volume":" 40","pages":""},"PeriodicalIF":1.3,"publicationDate":"2024-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140220555","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}