Ibis最新文献

{"title":"Mike Harris – Obituary","authors":"Ian Newton, Chris Perrins","doi":"10.1111/ibi.13413","DOIUrl":"https://doi.org/10.1111/ibi.13413","url":null,"abstract":"<p>With the death of Mike Harris on 17 December 2023, at the age of 84, the world lost one of its best known, most loved and most outstanding seabird biologists. For no less than 63 years, Mike studied seabirds, and was active in the field and publishing into his last year. Research Gate lists him as having 332 publications in total and 15 927 citations, including his many collaborative studies.</p><p>As for his early life, Michael Philip Harris was born in Swansea on the Welsh coast on 28 April 1939. The son of a motor mechanic, he attended local schools and also studied at Swansea University for BSc and PhD degrees. His passions for natural history, marine life and islands were evident from an early age, with much of his boyhood spent exploring the local countryside, and developing the field-craft that served him well through later life. He was inspired by the writings of fellow Welshman, Ronald Lockley, about the very islands and bird populations on which Mike would himself subsequently work. A brief spell acting as assistant warden at the Bird Observatory on Bardsey Island, off the north Welsh coast, helped to hone his skills in trapping, handling and ringing birds.</p><p>This was followed by PhD studies on Herring Gulls <i>Larus argentatus</i> and Lesser Black-backed Gulls <i>L. fuscus</i> on Skomer Island. In the summers of 1962 and 1963, this work entailed swapping all the eggs in several Lesser Black-backed Gull colonies with eggs in Herring Gull colonies to investigate aspects of species recognition and migration, forming one of the first large-scale field experiments in British ornithology (Harris <span>1970</span>). After completing his PhD, his examiner, David Lack, offered Mike a position at the Edward Grey Institute in Oxford, spanning the period 1962–73. He began with studies of gulls, Oystercatchers <i>Haematopus ostralegus</i> and Manx Shearwaters <i>Puffinus puffinus</i> on Skokholm Island, which he combined with being warden of the Bird Observatory there, another link with Ronald Lockley. While still based at the EGI, Mike moved to the Galápogos Islands in the late 1960s to study the nesting ecology of tropical seabirds, notably storm petrels and albatrosses. He discovered that the population of Band-rumped Storm Petrels <i>Hydrobates castro</i> consisted of two sectors, one nesting in one half of the year, and the other nesting in the second half, but both using the same set of burrows (Harris <span>1969</span>). Over the same period, Mike also produced the first <i>Field Guide to the Birds of Galapagos</i> (1974) still in use today. All this early work was undertaken at a time when fieldwork logistics, especially on remote islands, were much more challenging than today, with no computers, mobile phones or bird-borne data loggers.</p><p>While on Galápagos, Mike developed a friendship with Lars-Eric Lindblad who was interested in developing sustainable eco-tourism. He provided the funding which enabled Mike to develop the syste","PeriodicalId":13254,"journal":{"name":"Ibis","volume":"167 3","pages":"843-845"},"PeriodicalIF":1.8,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/ibi.13413","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144309049","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":"Peter J. Jones 1945–2024","authors":"Robert A. Cheke","doi":"10.1111/ibi.13415","DOIUrl":"https://doi.org/10.1111/ibi.13415","url":null,"abstract":"<p>Peter Jones, whose ornithological career was principally concentrated on tropical topics, was also an inspirational teacher whose interests encompassed not only biology but also art and music. Peter established his reputation with innovative studies of the granivorous pest the Red-billed Quelea <i>Quelea quelea</i> in Botswana and, later, in Nigeria alongside Peter Ward (1934–1979, <i>Ibis</i> 123: 546–547).</p><p>Peter was born in Orpington in Kent in 1945 but he and his parents, James and Irene Jones, moved not long afterwards to Cheltenham where James began working at the UK Government's communications headquarters (GCHQ), so Peter was brought up in the Cotswolds where his fascination with natural history flourished. After gaining a BSc in Zoology at the University of Exeter in 1966 he joined the Edward Grey Institute of Field Ornithology at Oxford to study the ecology of Great Tits <i>Parus major</i> supervised by Chris Perrins, leading to a PhD in 1973 for a thesis entitled ‘Some aspects of the feeding ecology of the Great Tit <i>Parus major</i>’ and a paper with Chris on the inheritance of clutch size in Great Tits (<i>Condor</i> 76: 225–229).</p><p>In 1969, Peter's association with queleas began when he worked as bird ecologist for the Government of Botswana, living in Maun until 1972. The next year he was appointed as a Senior Scientific Officer at the Centre for Overseas Pest Research (COPR), then one of the UK Government's Overseas Development Administration's scientific units which was later to be privatized and became a part of the University of Greenwich's Natural Resources Institute (NRI). At COPR he joined Peter Ward for ground-breaking work on the ecology of quelea published in <i>Ibis</i> (118: 547–574; 118: 575–576; 119: 200–203) and the <i>Journal of Zoology</i> (<i>J. Zool., Lond</i>. 181: 43–56). This research, later synthesized in a series of book chapters published in 1989, formed the bedrock of our current understanding of the ecology, physiology, moult, migration and control strategies of this economically important and exceedingly numerous bird pest of small-grained cereals in sub-Saharan Africa. Having known Peter since his Oxford days, I was delighted when he agreed to work with me on projects based at NRI in the late 1990s to resume quelea work to develop forecasting models (<i>J. Appl. Ecol</i>. 44: 523–533), in a period when we also worked with his then PhD student Martin Dallimer on migratory orientation and molecular analyses of their populations and blood parasites.</p><p>In 1979, Peter left COPR to become Lecturer, and later Senior Lecturer, at the Institute of Evolutionary Biology, Edinburgh University, where he remained until retirement in 2006. At Edinburgh he supervised 10 PhD students and both there and when lecturing for the Tropical Biology Association he gained a reputation as an inspiring teacher, garnering his extensive knowledge of tropical biology into concise and stimulating presentations. Some o","PeriodicalId":13254,"journal":{"name":"Ibis","volume":"167 3","pages":"839-840"},"PeriodicalIF":1.8,"publicationDate":"2025-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/ibi.13415","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144309039","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":"James John Maitland Flegg (1937–2024)","authors":"Robert J. Fuller","doi":"10.1111/ibi.13414","DOIUrl":"https://doi.org/10.1111/ibi.13414","url":null,"abstract":"<p>Jim Flegg was born in Hong Kong but was evacuated from there to Australia with his mother in the Second World War, and it was in Australia that his interest in birds was awakened. Jim's father did not survive the defence of Hong Kong and, an only child, he came with his mother to live in Gillingham, Kent, in 1945. For much of his life, with one important ornithological interlude when appointed to the top job at the British Trust for Ornithology, his life largely revolved around Kent, the county to which he was deeply attached.</p><p>His enthusiasm for birds grew under the influence of a teacher at Gillingham Grammar School, G.B. Rimes. This developed into an increasingly serious engagement with bird ringing. The 1950s was a time of intense interest in what bird ringing could reveal about bird migration. Dungeness Bird Observatory, founded in 1952, was a magnetic attraction and Jim soon became a regular, often cycling the 50 or so miles from north Kent. His first visit was in 1953 at the age of 16. Qualification for a ringing permit arrived the following year under the strict guidance of Bert Axell, then warden of Dungeness RSPB Reserve. Those early years of involvement with the Observatory introduced him to many well-known characters on the bird scene one of whom, Eric Hosking, was a future collaborator on several books. Jim was to become the Observatory's longest serving trustee – 68 years!</p><p>Ringing in Kent continued to feature strongly in his ornithological interests throughout the 1960s and 1970s often in partnership first with David Musson and then with Chris Cox. A 10-year study of Black-headed Gulls <i>Chroicocephalus ridibundus</i> breeding on the saltmarshes of the Medway and Swale estuaries focused on movements, dispersal and mortality. These local data were combined with national BTO data. Another 10-year project was undertaken in the woodland of High Halstow National Nature Reserve where the morphometrics and moult of Great Tits <i>Parus major</i> and Eurasian Blue Tits <i>Cyanistes caeruleus</i> were examined.</p><p>After leaving school he had started a civil engineering degree at Queen Mary College but a change of direction quickly followed in the form of a junior scientific officer post at the horticultural research station at East Malling, Kent. He completed a degree in zoology at Imperial College, followed by a PhD awarded by London University in 1967 for work on nematode vectors of plant pathogenic viruses. Jim was later to return to East Malling where he remained for the rest of his non-ornithological career and in 1997 he received an OBE for services to horticulture. Following this first period of work at East Malling, he was appointed Director of Research at the BTO in 1968 as David Snow's successor. The following year he became the BTO's first Director, a post he held until late 1975 when he returned to the world of horticultural research.</p><p>Jim Flegg's tenure at the BTO came at a time when the organization was be","PeriodicalId":13254,"journal":{"name":"Ibis","volume":"167 3","pages":"841-842"},"PeriodicalIF":1.8,"publicationDate":"2025-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/ibi.13414","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144309040","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":"British Ornithologists' Union – Godman Salvin Prize","authors":"Keith Hamer","doi":"10.1111/ibi.13396","DOIUrl":"https://doi.org/10.1111/ibi.13396","url":null,"abstract":"","PeriodicalId":13254,"journal":{"name":"Ibis","volume":"167 3","pages":"846-847"},"PeriodicalIF":1.8,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/ibi.13396","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144308958","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":"Methods of acoustic data processing affect species detectability in passive acoustic monitoring of multi-species playback","authors":"Dominika Winiarska,&nbsp;Paweł Szymański,&nbsp;Tomasz S. Osiejuk","doi":"10.1111/ibi.13405","DOIUrl":"https://doi.org/10.1111/ibi.13405","url":null,"abstract":"<p>Passive acoustic monitoring (PAM) efforts have recently been accelerated by the development of automated detection tools, enabling quick and reliable analysis of recordings. However, automated methods are still susceptible to errors, and human processors achieve more accurate results. Our study evaluates the efficacy of three detection methods (auditory, visual and automated using BirdNET) for 43 European bird species (31 diurnal, 12 nocturnal), analysing the impact of various factors on detection probability over different distances. We conducted transmission experiments in two forest types from March to June, examining the effect of call characteristics, weather conditions and habitat features, to assess their impact on detection probability at different distances. Our findings reveal that species detection distance varies with each detection method, with listening to recordings obtaining the highest detectability, followed by the visual method. Although BirdNET is less accurate, it still proves useful for detection, especially for loud species. Large diurnal and small nocturnal species were most detected. Our study emphasizes the importance of considering detection methods to maximize species detectability for effective PAM research.</p>","PeriodicalId":13254,"journal":{"name":"Ibis","volume":"167 3","pages":"789-802"},"PeriodicalIF":1.8,"publicationDate":"2025-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144308746","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}

{"title":"Post-fledging movements in an elusive raptor, the Eurasian Goshawk (Accipiter gentilis): scale of dispersal, foraging range and habitat interactions in lowland England","authors":"Ian G. Henderson,&nbsp;Madeleine Barton,&nbsp;Anna Field,&nbsp;Rob Husbands,&nbsp;Gareth Jones,&nbsp;Neal Armour-Chelu,&nbsp;Greg Conway","doi":"10.1111/ibi.13403","DOIUrl":"https://doi.org/10.1111/ibi.13403","url":null,"abstract":"<p>Studies of the response of high-trophic-level predatory species to environmental gradients contribute to our understanding of adaptation, dependency and risk, both to the predator and its prey. Many such species are of high conservation concern because of a slow life history and a greater susceptibility to threats, not least in organized anthropogenic landscapes that have the propensity to modify or even distort predator–prey dynamics. There are, however, observational difficulties in studying species that are wide-ranging and furtive in their behaviour. All the above characteristics are shared by the Eurasian Goshawk <i>Accipiter gentilis</i>, a highly elusive species for which the movements and habitat associations are poorly quantified at large geographical scales. In Great Britain, this species is of further interest because the population is recovering from the historical impacts of persecution. Here we used remote tracking methods to gather spatially accurate accumulations of data for reliable depictions of movement scale and habitat use in Eurasian Goshawks during the early months of independence from the nest environment (termed ‘first-winter’). The data were taken from two regions of England for good geographical representation of lowland habitats. First-winter Eurasian Goshawks exhibited strongly philopatric characteristics with low levels of natal dispersal once settled. They adopted sedentary and localized foraging patterns, averaging less than 5 km in diameter for approximately 90% of the time, located on the periphery of breeding habitat and centred on farmland or farmland edge, unlike the more forest-centric adults. The use of farmland was especially the case for the first-winter males compared with females, which we speculate may be driven by competitive exclusion or hunting advantages. The results are discussed in the context of future population recovery and colonization, while recognizing existing and emerging threats, including diseases such as highly pathogenic avian influenza and trichomonosis. The study also serves as a methodological demonstration of the capacity for tracking technology to contribute more to our understanding of predators and, by extension, predation as a response to change (such as land-use practice), that can shape observed patterns of conflict.</p>","PeriodicalId":13254,"journal":{"name":"Ibis","volume":"167 3","pages":"660-678"},"PeriodicalIF":1.8,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144308910","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}

{"title":"Genetic diversity and the implications of captive rearing for a small population of Black-tailed Godwits","authors":"Jennifer Smart,&nbsp;Yvonne I. Verkuil,&nbsp;Krijn B. Trimbos,&nbsp;Nicola C. Dessi,&nbsp;Rebecca Lewis","doi":"10.1111/ibi.13400","DOIUrl":"https://doi.org/10.1111/ibi.13400","url":null,"abstract":"<p>Black-tailed Godwit <i>Limosa limosa limosa</i> clutches have been collected for headstarting, a captive rearing intervention where eggs are taken from the wild and artificially incubated, and chicks are reared in captivity to fledging, before being released into the wild. This conservation measure has reduced local extinction risk for the UK population, but it may have impacts on genetic diversity and population viability, especially when wild-sourced eggs must be collected from a small population. Comparing the UK population of 42 pairs with the much larger breeding population in the Netherlands (~30 000 pairs), we found that levels of heterozygosity and inbreeding are not currently compromised, and allelic richness in the UK population was not significantly different from the Dutch population, but relatedness estimates suggest that 6.1% of the individuals in the UK are closely related, at the level of half-sibling and up, compared with 1.9% in the Dutch population. Increasing levels of relatedness could further deplete genetic variation, in the absence of immigration or the introduction of wild-sourced eggs from other populations.</p>","PeriodicalId":13254,"journal":{"name":"Ibis","volume":"167 3","pages":"812-818"},"PeriodicalIF":1.8,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/ibi.13400","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144309118","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":"Foraging niche partitioning within a recently established guild of falcons","authors":"Alessandro Berlusconi,&nbsp;Mauro Gobbi,&nbsp;Alessio Martinoli,&nbsp;Riccardo Alba,&nbsp;Giacomo Assandri,&nbsp;Fabio Bona,&nbsp;Filippo M. Buzzetti,&nbsp;Claudia De Battisti,&nbsp;Carlo Morelli,&nbsp;Davide Scridel,&nbsp;Jacopo G. Cecere,&nbsp;Damiano Preatoni,&nbsp;Andrea Romano,&nbsp;Diego Rubolini,&nbsp;Adriano Martinoli,&nbsp;Michelangelo Morganti","doi":"10.1111/ibi.13399","DOIUrl":"https://doi.org/10.1111/ibi.13399","url":null,"abstract":"<p>Ecological theory predicts that coexisting species should exhibit realized niche differentiation to minimize competition. However, little is known about patterns of niche differentiation when ‘newcomer’ species spontaneously colonize a new region, leading to novel sympatric conditions. Over the past 15 years, three closely related and ecologically similar falcon species (Common Kestrel <i>Falco tinnunculus</i>, Lesser Kestrel <i>Falco naumanni</i> and Red-footed Falcon <i>Falco vespertinus</i>) have expanded their ranges as the result of land-use and climate changes in the intensively cultivated agroecosystems of the Po Plain (Northern Italy). This is a unique condition in the European range of these species and provides an excellent opportunity to investigate patterns of foraging and trophic niche partitioning during the initial phases of sympatry. We assessed species-specific patterns of foraging habitat selection and interspecific differences in diet composition. Our findings showed that falcons selected largely overlapping foraging habitats, yet exhibited significant differentiation among species regarding vegetation height, structure and crop types. Overall, diet composition was similar, though some degree of trophic niche differentiation was detected. In line with the niche partitioning hypothesis, the three species slightly partitioned their foraging and trophic niches, probably playing a key role in making syntopic coexistence possible. Our study provides insights into the mechanisms of niche partitioning when ‘newcomers’ appear in a guild, a process that is likely to become increasingly relevant because of the rapid and often uneven distributional shifts caused by global change.</p>","PeriodicalId":13254,"journal":{"name":"Ibis","volume":"167 3","pages":"734-749"},"PeriodicalIF":1.8,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/ibi.13399","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144309111","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":"Migration and stopover use by GPS-tracked adult Ospreys (Pandion haliaetus) from Germany","authors":"Bernd-Ulrich Meyburg,&nbsp;Daniel Holte","doi":"10.1111/ibi.13402","DOIUrl":"https://doi.org/10.1111/ibi.13402","url":null,"abstract":"<p>The ability to meet the high energetic costs of long-distance migration can be a key factor in the survival of individual birds. The use of stopovers, where individuals pause to rest and feed, is a common strategy in many migratory bird species. In this study, we explore migration timing of 28 satellite-tracked (17 GPS and 11 Argos) adult migratory Ospreys <i>Pandion haliaetus</i> from northeastern Germany. For 15 of the GPS-tracked birds that migrated to Africa, we used Generalized Linear Mixed-effects Models to analyse the effects of sex, migration period, departure date and other factors on the number of stopovers per season, and the individual and total lengths of stay at stopover sites. Female long-distance migrants arrived at breeding sites earlier than male long-distance migrants in spring, contradicting common theory. Females left the breeding sites on autumn migration more than a month before males. The number of stopovers was not affected by the variables tested, but more stopovers led to longer total stays per individual migration period. Autumn stopovers were longer in total (males: mean = 58.1 h (95% CI = 31.1–85.0); females: mean = 164.0 (98.3–229.6)) than spring stopovers (males: mean = 50.9 h (0.0–114.6); females: mean = 39.9 (11.9–67.9), especially with early autumn departure dates. Ospreys spent long periods at stopovers mainly at high latitudes (in Europe), but relatively long stopovers were also observed in North Africa (between the Mediterranean and the Sahara), so stopover length did not vary with latitude. Seasonal fidelity to stopover sites between years was low, except for five females. This flexibility complicates the establishment of protected areas for migrating Ospreys along the migratory flyway.</p>","PeriodicalId":13254,"journal":{"name":"Ibis","volume":"167 3","pages":"646-659"},"PeriodicalIF":1.8,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/ibi.13402","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144308597","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":"Hybridization and genome-wide introgression in sympatric populations of North American wood-pewees (Contopus sordidulus and Contopus virens)","authors":"Joseph D. Manthey,&nbsp;Mark B. Robbins","doi":"10.1111/ibi.13401","DOIUrl":"https://doi.org/10.1111/ibi.13401","url":null,"abstract":"<p>The Great Plains contains many contact zones between eastern and western North American bird species. In these contact zones, closely related lineages or species vary widely in both the geographical and the genomic extent of their hybridization. Two phenotypically similar sister species of flycatchers – the Eastern Wood-Pewee <i>Contopus virens</i> and the Western Wood-Pewee <i>Contopus sordidulus</i> – have sparse geographical overlap in the Great Plains, including a few isolated planted forest stands and along forested riparian corridors of the Niobrara and Platte rivers in central Nebraska, USA. Our previous genetic work found low levels of genetic differentiation between these two flycatcher species, along with several putatively admixed individuals in this zone of sympatry in Nebraska. Here, we used whole-genome sequencing to confirm the presence of admixed individuals and quantify nonrandom gene flow, both in direction between taxa and location in the genome. We confirm the presence of both early-generation hybrids and highly backcrossed individuals in this contact zone. We found moderate levels of genetic differentiation between the two species, with the highest differentiation on the Z chromosome. In addition, all individuals in sympatry contained at least some minor parental genomic ancestry, suggestive of bidirectional introgression. There was evidence of introgression in sympatric individuals across the entire genome, except for approximately half the Z chromosome, suggesting that there is some selection and resistance to admixture in this genomic region.</p>","PeriodicalId":13254,"journal":{"name":"Ibis","volume":"167 3","pages":"750-764"},"PeriodicalIF":1.8,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144309205","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}