Pub Date : 2023-01-01DOI: 10.5751/jfo-00219-940110
Christina G. Morrissey, Kurtis J Swekla
{"title":"Refinements in adipose tissue biopsy collection in shorebirds: effect on pain, wound healing, and mass gain","authors":"Christina G. Morrissey, Kurtis J Swekla","doi":"10.5751/jfo-00219-940110","DOIUrl":"https://doi.org/10.5751/jfo-00219-940110","url":null,"abstract":"","PeriodicalId":15785,"journal":{"name":"Journal of Field Ornithology","volume":"1 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71042505","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}
Pub Date : 2023-01-01DOI: 10.5751/jfo-00233-940107
Andrew Sharp, A. Contina, V. Ruiz‐Gutierrez, T. Sillett, E. Bridge, Elizabeth M. Besozzi, John Muller, Jeffrey Kelly, Aaron M. Given, Clark S. Rushing
{"title":"The strength of migratory connectivity in Painted Buntings is spatial scale dependent and shaped by molting behavior","authors":"Andrew Sharp, A. Contina, V. Ruiz‐Gutierrez, T. Sillett, E. Bridge, Elizabeth M. Besozzi, John Muller, Jeffrey Kelly, Aaron M. Given, Clark S. Rushing","doi":"10.5751/jfo-00233-940107","DOIUrl":"https://doi.org/10.5751/jfo-00233-940107","url":null,"abstract":"","PeriodicalId":15785,"journal":{"name":"Journal of Field Ornithology","volume":"1 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71042680","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}
Pub Date : 2023-01-01DOI: 10.5751/jfo-00209-940105
R. Phillips, Kashmir Wolf, Ryan P. Bourbour, Jonathan Urbina, Jorge Eduardo Ruano, Victor Bonilla, Victor Gamez, Isael Mai, Isaias Morataya, Ronald Martinez, Liberato Pop, Philip Balderamos, H. L. Jones, Ronald Melcer Jr., L. Trulio, E. Ruelas Inzunza
{"title":"Intratropical migration of the Hook-billed Kite ( Chondrohierax uncinatus ) in Middle America","authors":"R. Phillips, Kashmir Wolf, Ryan P. Bourbour, Jonathan Urbina, Jorge Eduardo Ruano, Victor Bonilla, Victor Gamez, Isael Mai, Isaias Morataya, Ronald Martinez, Liberato Pop, Philip Balderamos, H. L. Jones, Ronald Melcer Jr., L. Trulio, E. Ruelas Inzunza","doi":"10.5751/jfo-00209-940105","DOIUrl":"https://doi.org/10.5751/jfo-00209-940105","url":null,"abstract":"","PeriodicalId":15785,"journal":{"name":"Journal of Field Ornithology","volume":"1 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71042865","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}
Pub Date : 2023-01-01DOI: 10.5751/jfo-00305-940311
Blaine H. Carnes, Abidas Ash
. We document molt extent; age-specific molt patterns, plumages, and percent of the bill with corrugations; the presence or absence of delayed plumage maturation and bill color changes in males of some species; and molt timing in the 19 resident hummingbird species of Belize. Molt strategies and rates of bill smoothing were similar to North American species, with all species showing limited to partial preformative molts, replacing only body feathers and some wing coverts and retaining all remiges and rectrices. Extent of bill corrugations reduced to ≤10% of bill length in all species by the time definitive cycle basic plumage is achieved. Males in sexually dichromatic species showed delayed maturation in plumage characteristics and/or bill coloration, and in two dichromatic species some older females showed male-like plumage. Nine species representing multiple clades showed advanced timing to the second prebasic molt, indicating that this trait may be a proximal response to individuals not breeding during the first molt cycle. Species with advanced second prebasic molts replaced fewer wing coverts during the preformative molt than species with later molt timing.
{"title":"Many Central American hummingbirds can be aged and sexed by molt patterns and bill corrugations","authors":"Blaine H. Carnes, Abidas Ash","doi":"10.5751/jfo-00305-940311","DOIUrl":"https://doi.org/10.5751/jfo-00305-940311","url":null,"abstract":". We document molt extent; age-specific molt patterns, plumages, and percent of the bill with corrugations; the presence or absence of delayed plumage maturation and bill color changes in males of some species; and molt timing in the 19 resident hummingbird species of Belize. Molt strategies and rates of bill smoothing were similar to North American species, with all species showing limited to partial preformative molts, replacing only body feathers and some wing coverts and retaining all remiges and rectrices. Extent of bill corrugations reduced to ≤10% of bill length in all species by the time definitive cycle basic plumage is achieved. Males in sexually dichromatic species showed delayed maturation in plumage characteristics and/or bill coloration, and in two dichromatic species some older females showed male-like plumage. Nine species representing multiple clades showed advanced timing to the second prebasic molt, indicating that this trait may be a proximal response to individuals not breeding during the first molt cycle. Species with advanced second prebasic molts replaced fewer wing coverts during the preformative molt than species with later molt timing.","PeriodicalId":15785,"journal":{"name":"Journal of Field Ornithology","volume":"1 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71043165","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}
Pub Date : 2023-01-01DOI: 10.5751/jfo-00310-940309
D. Ferreira, L. Figueira, Filipe C. R. Cunha, L. Lopes
. Lined Seedeaters Sporophila lineola , an intra-tropical migratory songbird, exhibit extensive phenotypic variation, with characteristic black-and-white male and brownish female plumages. In this study, we investigated whether variation in male plumage represents delayed plumage maturation, as reported for many other Sporophila seedeaters. We used data on molt and plumage from a seven-year-long study of color-banded Lined Seedeaters in southeastern Brazil. We also gathered molt and plumage data from museum collections and citizen-science platforms to identify which molts occur outside the breeding grounds. Our findings show that Lined Seedeaters follow a complex basic strategy, but the possibility that some individuals exhibit a complex alternate strategy, which is a common strategy among congeners, cannot be ruled out. Preformative molt and fresh formative plumage were recorded within the breeding grounds in the last months of the breeding season. Prebasic molt also start on the breeding grounds and probably continue during migration to the wintering grounds. Observed phenotypic variation in plumage of Lined Seedeater males is a product of delayed plumage maturation. Breeding males in female-like plumage are formative individuals in their first breeding season. All monitored males acquired black-and-white definitive plumage after their first breeding season, during the second pre-basic molt, but we found limited evidence that some individuals may retain the brownish plumage for more than one cycle. Descriptions presented here advance our understanding of Sporophila molt
{"title":"Molt strategy and delayed plumage maturation in the Lined Seedeater","authors":"D. Ferreira, L. Figueira, Filipe C. R. Cunha, L. Lopes","doi":"10.5751/jfo-00310-940309","DOIUrl":"https://doi.org/10.5751/jfo-00310-940309","url":null,"abstract":". Lined Seedeaters Sporophila lineola , an intra-tropical migratory songbird, exhibit extensive phenotypic variation, with characteristic black-and-white male and brownish female plumages. In this study, we investigated whether variation in male plumage represents delayed plumage maturation, as reported for many other Sporophila seedeaters. We used data on molt and plumage from a seven-year-long study of color-banded Lined Seedeaters in southeastern Brazil. We also gathered molt and plumage data from museum collections and citizen-science platforms to identify which molts occur outside the breeding grounds. Our findings show that Lined Seedeaters follow a complex basic strategy, but the possibility that some individuals exhibit a complex alternate strategy, which is a common strategy among congeners, cannot be ruled out. Preformative molt and fresh formative plumage were recorded within the breeding grounds in the last months of the breeding season. Prebasic molt also start on the breeding grounds and probably continue during migration to the wintering grounds. Observed phenotypic variation in plumage of Lined Seedeater males is a product of delayed plumage maturation. Breeding males in female-like plumage are formative individuals in their first breeding season. All monitored males acquired black-and-white definitive plumage after their first breeding season, during the second pre-basic molt, but we found limited evidence that some individuals may retain the brownish plumage for more than one cycle. Descriptions presented here advance our understanding of Sporophila molt","PeriodicalId":15785,"journal":{"name":"Journal of Field Ornithology","volume":"1 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71043570","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}
Pub Date : 2023-01-01DOI: 10.5751/jfo-00315-940310
E. Pandolfino, L. Douglas
. Conservation of a migratory species requires knowledge not only of its breeding range, but also of its migratory path and non-breeding range. Except for timing, other aspects of the migration of the Ruby-crowned Kinglet ( Corthylio calendula ) remain largely unstudied, with no published data on migration routes. Breeding populations of this species in the Sierra Nevada and Cascades mountain ranges, as well as those in eastern Canada and the northeastern U.S., have experienced significant declines, whereas Rocky Mountain breeders have increased. Understanding the winter range and migratory pathways used by different breeding populations may be key to explaining these contrasting population trends. Song dialects of the Ruby-crowned Kinglet differ regionally among various breeding populations, and these dialect regions were previously mapped. Because this kinglet sings during spring migration and winter, we obtained archived, non-breeding-season recordings of song and assigned each to one of those regional song dialects. This allowed us to assess the likely winter ranges and migration pathways of different breeding populations. This approach offers some advantages over typical methods of tracking movements. Birds do not need to be captured; one can easily obtain data over large ranges and from many individuals; and it can be applied to species, such as this kinglet, that are too small to permit use of most tracking devices. We were able to assess likely winter range and spring migration routes for populations that breed in the eastern U.S. and Canada, the interior of Alaska, and for the subspecies C c. grinnelli that breeds along the Gulf of Alaska and western British Columbia
。保护迁徙物种不仅需要了解其繁殖范围，还需要了解其迁徙路径和非繁殖范围。除了时间外，红宝石冠小雀(Corthylio calendula)迁徙的其他方面在很大程度上仍未被研究，没有关于迁徙路线的公开数据。内华达山脉和喀斯喀特山脉以及加拿大东部和美国东北部的繁殖种群数量明显下降，而落基山脉的繁殖种群数量却有所增加。了解不同繁殖种群的冬季范围和迁徙路径可能是解释这些不同种群趋势的关键。红宝石冠小王的宋语方言在不同的繁殖种群中存在区域差异，这些方言区域以前已经被绘制出来。由于这只小王雀在春季迁徙和冬季唱歌，我们获得了存档的非繁殖季节的歌曲记录，并将每只歌曲分配给这些地区的一种歌曲方言。这使我们能够评估不同繁殖种群可能的冬季范围和迁徙路径。这种方法比跟踪运动的典型方法有一些优势。鸟类不需要被捕获;人们可以很容易地从许多人那里获得大范围的数据;它可以应用于物种，比如这只小国王，它们太小了，无法使用大多数跟踪设备。我们能够评估在美国东部和加拿大、阿拉斯加内陆繁殖的种群的冬季范围和春季迁徙路线，以及在阿拉斯加湾和不列颠哥伦比亚省西部繁殖的C . C . grinnelli亚种
{"title":"Using song dialects to reveal migratory patterns of Ruby-crowned Kinglet populations","authors":"E. Pandolfino, L. Douglas","doi":"10.5751/jfo-00315-940310","DOIUrl":"https://doi.org/10.5751/jfo-00315-940310","url":null,"abstract":". Conservation of a migratory species requires knowledge not only of its breeding range, but also of its migratory path and non-breeding range. Except for timing, other aspects of the migration of the Ruby-crowned Kinglet ( Corthylio calendula ) remain largely unstudied, with no published data on migration routes. Breeding populations of this species in the Sierra Nevada and Cascades mountain ranges, as well as those in eastern Canada and the northeastern U.S., have experienced significant declines, whereas Rocky Mountain breeders have increased. Understanding the winter range and migratory pathways used by different breeding populations may be key to explaining these contrasting population trends. Song dialects of the Ruby-crowned Kinglet differ regionally among various breeding populations, and these dialect regions were previously mapped. Because this kinglet sings during spring migration and winter, we obtained archived, non-breeding-season recordings of song and assigned each to one of those regional song dialects. This allowed us to assess the likely winter ranges and migration pathways of different breeding populations. This approach offers some advantages over typical methods of tracking movements. Birds do not need to be captured; one can easily obtain data over large ranges and from many individuals; and it can be applied to species, such as this kinglet, that are too small to permit use of most tracking devices. We were able to assess likely winter range and spring migration routes for populations that breed in the eastern U.S. and Canada, the interior of Alaska, and for the subspecies C c. grinnelli that breeds along the Gulf of Alaska and western British Columbia","PeriodicalId":15785,"journal":{"name":"Journal of Field Ornithology","volume":"1 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71043637","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}
Pub Date : 2023-01-01DOI: 10.5751/jfo-00341-940314
Erik Prytula, Matthew Reudink, Stefanie LaZerte, Jared Sonnleitner, Ann McKellar
. Climate change has resulted in changes to ecosystems and weather because of earlier onset of spring weather, later onset of fall weather, and more extreme weather patterns. Migratory birds may experience challenges adjusting to these new conditions. We utilized community science data from eBird that spanned 2009–2018 to test for changes in distribution and migration of two North American swift species. We asked if Vaux’s Swifts ( Chaetura vauxi ) and Chimney Swifts ( Chaetura pelagica ) changed their breeding distribution, migration routes, timing of migration, or speed of spring and fall migration over time. Our results show that Vaux’s Swifts shifted their breeding centroid south-east and Chimney Swifts shifted their breeding centroid west. There was also a shift in Vaux’s Swifts migration route to the east, almost proportionate in magnitude to its eastern shift in breeding range. Vaux’s Swifts displayed an advance in their start of spring migration, and Chimney Swifts exhibited a delay in their start of fall migration. These responses may be due to earlier onset of spring and a possible delay of colder temperatures associated with the onset of fall conditions. Our results indicated that both species are breeding further away from the coastline and more toward central
{"title":"Shifts in breeding distribution, migration timing, and migration routes of two North American swift species","authors":"Erik Prytula, Matthew Reudink, Stefanie LaZerte, Jared Sonnleitner, Ann McKellar","doi":"10.5751/jfo-00341-940314","DOIUrl":"https://doi.org/10.5751/jfo-00341-940314","url":null,"abstract":". Climate change has resulted in changes to ecosystems and weather because of earlier onset of spring weather, later onset of fall weather, and more extreme weather patterns. Migratory birds may experience challenges adjusting to these new conditions. We utilized community science data from eBird that spanned 2009–2018 to test for changes in distribution and migration of two North American swift species. We asked if Vaux’s Swifts ( Chaetura vauxi ) and Chimney Swifts ( Chaetura pelagica ) changed their breeding distribution, migration routes, timing of migration, or speed of spring and fall migration over time. Our results show that Vaux’s Swifts shifted their breeding centroid south-east and Chimney Swifts shifted their breeding centroid west. There was also a shift in Vaux’s Swifts migration route to the east, almost proportionate in magnitude to its eastern shift in breeding range. Vaux’s Swifts displayed an advance in their start of spring migration, and Chimney Swifts exhibited a delay in their start of fall migration. These responses may be due to earlier onset of spring and a possible delay of colder temperatures associated with the onset of fall conditions. Our results indicated that both species are breeding further away from the coastline and more toward central","PeriodicalId":15785,"journal":{"name":"Journal of Field Ornithology","volume":"1 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71043936","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}
Pub Date : 2023-01-01DOI: 10.5751/jfo-00368-940404
Olivia Lappin, Kristine Evans, Raymond Iglay, Mark McConnell
Appropriate habitat management may be one of the most important factors contributing to Northern Bobwhite (Colinus virginianus) population persistence, but biologists lack information on how individual bobwhite select roost sites during the breeding season. Therefore, we examined breeding season third-order roost site selection on B. Bryan Farms, Mississippi, from 2021 to 2022. We observed a quadratic relationship with average vegetation height, where roost site selection increased with increasing vegetation height to a point and then slightly decreased (β1 = 0.14084, 95% CI = 0.05, 0.24; β12 = -0.01005, 95% CI = -0.06, 0.04). However, uncertainty in the quadratic term was notable. Similarly, we observed a quadratic relationship with litter (β1 = 0.25479, 95% CI = 0.12, 0.39; β12 = -0.09606, 95% CI = -0.16, -0.04). We also found selection decreased linearly with increasing bare ground (β1 =-0.20938, 95% CI = -0.31, -0.11). Individual birds may require taller vegetation, greater visual obstruction, greater litter coverage, and lesser bare ground coverage for better concealment from nocturnal predators when they are roosting individually during the breeding season or are constrained by limited mobility (i.e., brooding). Understanding the vegetative composition, structure, and location of roost sites during the breeding season may provide land managers with a better understanding of the vegetative characteristics necessary during all phases of bobwhite life history. Our results provide the first information on bobwhite breeding season roost site selection, which will help to develop a more complete understanding of bobwhite habitat requirements and increase the effectiveness of habitat management and conservation efforts for this species of conservation concern.
适当的栖息地管理可能是促成北山齿鹑种群持久性的最重要因素之一，但生物学家缺乏关于在繁殖季节单个山齿鹑如何选择栖息地的信息。因此，我们从2021年到2022年对密西西比州B. Bryan农场的繁殖季节三级栖息地选择进行了研究。与平均植被高度呈二次曲线关系，随着植被高度的增加，巢址选择增加到一定程度后略有减少(β1 = 0.14084, 95% CI = 0.05, 0.24;β12 = -0.01005, 95% ci = -0.06, 0.04)。然而，二次项中的不确定性是值得注意的。同样，我们观察到与凋落物的二次关系(β1 = 0.25479, 95% CI = 0.12, 0.39;β12 = -0.09606, 95% ci = -0.16， -0.04)。我们还发现，随着裸地的增加，选择呈线性下降(β1 =-0.20938, 95% CI = -0.31， -0.11)。个体鸟可能需要更高的植被、更大的视觉障碍、更大的凋落物覆盖和更少的光秃秃的地面覆盖，以便在繁殖季节单独栖息或受限于有限的流动性(即孵蛋)时更好地隐藏夜间捕食者。了解山齿鹑繁殖期栖息地的营养成分、结构和位置，可以帮助土地管理者更好地了解山齿鹑生活史各个阶段的营养特征。本研究结果首次提供了山齿鹑繁殖季节栖息地选择的信息，有助于更全面地了解山齿鹑的栖息地需求，提高这一受保护物种的栖息地管理和保护工作的有效性。
{"title":"Northern Bobwhite ( Colinus virginianus ) breeding season roost site selection in a working agricultural landscape in Clay County, Mississippi","authors":"Olivia Lappin, Kristine Evans, Raymond Iglay, Mark McConnell","doi":"10.5751/jfo-00368-940404","DOIUrl":"https://doi.org/10.5751/jfo-00368-940404","url":null,"abstract":"Appropriate habitat management may be one of the most important factors contributing to Northern Bobwhite (<em>Colinus virginianus</em>) population persistence, but biologists lack information on how individual bobwhite select roost sites during the breeding season. Therefore, we examined breeding season third-order roost site selection on B. Bryan Farms, Mississippi, from 2021 to 2022. We observed a quadratic relationship with average vegetation height, where roost site selection increased with increasing vegetation height to a point and then slightly decreased (β1 = 0.14084, 95% CI = 0.05, 0.24; β12 = -0.01005, 95% CI = -0.06, 0.04). However, uncertainty in the quadratic term was notable. Similarly, we observed a quadratic relationship with litter (β1 = 0.25479, 95% CI = 0.12, 0.39; β12 = -0.09606, 95% CI = -0.16, -0.04). We also found selection decreased linearly with increasing bare ground (β1 =-0.20938, 95% CI = -0.31, -0.11). Individual birds may require taller vegetation, greater visual obstruction, greater litter coverage, and lesser bare ground coverage for better concealment from nocturnal predators when they are roosting individually during the breeding season or are constrained by limited mobility (i.e., brooding). Understanding the vegetative composition, structure, and location of roost sites during the breeding season may provide land managers with a better understanding of the vegetative characteristics necessary during all phases of bobwhite life history. Our results provide the first information on bobwhite breeding season roost site selection, which will help to develop a more complete understanding of bobwhite habitat requirements and increase the effectiveness of habitat management and conservation efforts for this species of conservation concern.","PeriodicalId":15785,"journal":{"name":"Journal of Field Ornithology","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135009871","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}
Pub Date : 2023-01-01DOI: 10.5751/jfo-00276-940305
P. Caylor, ST. Augustine, Christopher T. Rota
. Canada Warblers ( Cardellina canadensis ) are small Neotropical migrants whose populations are declining across most of their range. Understanding factors limiting Canada Warbler populations requires knowledge of population ecology across the full annual cycle, including migratory pathways and over-winter locations. Light-level geolocator tags have offered unprecedented insight into migratory ecology for many species, but previous studies suggest that geolocators may influence apparent return rates. We sought to determine if geolocators influence apparent return rates of adult male Canada Warblers breeding in West Virginia, USA. In 2020, we deployed geolocators on 32 birds and color banded an additional 78 birds without geolocators. The following year, 13 of 32 (40.6%) geolocator birds and 37 of 78 (47.4%) color-banded birds were detected with no significant difference in apparent return rates between groups ( χ ² = 0.19, p = 0.66). Although further evaluation of additional groups will be valuable, the lack of significant effect on adult male Canada Warblers suggests that the slightly lower return rate does not preclude the use of geolocators as a tool to assess the migration ecology of this small songbird of conservation concern
{"title":"No effect of geolocators on apparent return rates of a declining Neotropical migrant, the Canada Warbler ( Cardellina canadensis ).","authors":"P. Caylor, ST. Augustine, Christopher T. Rota","doi":"10.5751/jfo-00276-940305","DOIUrl":"https://doi.org/10.5751/jfo-00276-940305","url":null,"abstract":". Canada Warblers ( Cardellina canadensis ) are small Neotropical migrants whose populations are declining across most of their range. Understanding factors limiting Canada Warbler populations requires knowledge of population ecology across the full annual cycle, including migratory pathways and over-winter locations. Light-level geolocator tags have offered unprecedented insight into migratory ecology for many species, but previous studies suggest that geolocators may influence apparent return rates. We sought to determine if geolocators influence apparent return rates of adult male Canada Warblers breeding in West Virginia, USA. In 2020, we deployed geolocators on 32 birds and color banded an additional 78 birds without geolocators. The following year, 13 of 32 (40.6%) geolocator birds and 37 of 78 (47.4%) color-banded birds were detected with no significant difference in apparent return rates between groups ( χ ² = 0.19, p = 0.66). Although further evaluation of additional groups will be valuable, the lack of significant effect on adult male Canada Warblers suggests that the slightly lower return rate does not preclude the use of geolocators as a tool to assess the migration ecology of this small songbird of conservation concern","PeriodicalId":15785,"journal":{"name":"Journal of Field Ornithology","volume":"1 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71043276","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}
Pub Date : 2023-01-01DOI: 10.5751/jfo-00283-940207
Dustin E. Brewer, Thom Gehring, Brendan T. Shirkey, J. Simpson
. Conspecific audio can be broadcast to improve detection probability (detectability) of secretive marsh bird species for population monitoring purposes and as a lure to more effectively trap individuals. Our primary objective was to describe King Rail ( Rallus elegans ) detectability as a function of distance and so determine if the distance sampling assumption of perfect detectability immediately adjacent to survey points was violated during call-broadcast surveys. We also described what factors affected King Rail detectability during audio broadcast surveys, and how and when this species was detected
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