Mariela Forti, G. Florez-Montero, J. S. Monrós, P. Vera
Abstract. Wetlands are among the most threatened ecosystems on the planet, largely due to their conversion to agricultural or dry land. L'Albufera de Vàlencia is characterized by a large expanse of rice fields (c. 14,000 ha), which hosts the most important colony of Grey Heron Ardea cinerea on the Mediterranean coast of Spain. The colony was visited every 10 days during February-April of 2016 to 2018 and during May-July of 2015 to 2017. The reproductive parameters were estimated for each year and season. We also monitored the available habitat and habitat use of the species in the rice fields from February 2016 to June 2017. The condition of the rice field was related to reproductive parameters. The breeding period was divided into two stages per year. In 2016 all reproductive parameters were lower values, coinciding with a larger area of dry fields in winter and low rainfall in summer. Breeding success was found to be positively associated with the muddy/semi-flooded fields and negatively associated with the sown fields. Like Grey Heron, other waterbirds species nesting in L'Albufera de Valencia could depend on the condition of the rice fields for breeding success. Their reproductive requirements should be considered in rice cultivation management.
摘要湿地是地球上最受威胁的生态系统之一，主要原因是它们被转化为农业或旱地。L'Albufera de Vàlencia的特点是大面积的稻田(约14000公顷)，在西班牙地中海沿岸拥有最重要的灰鹭Ardea cinerea殖民地。在2016年2月至2018年4月和2015年5月至2017年7月期间，每10天对该殖民地进行一次访问。估计了每年和每个季节的繁殖参数。并于2016年2月至2017年6月对该物种的有效生境和生境利用情况进行了监测。稻田条件与生殖参数有关。每年的繁殖期分为两个阶段。2016年各生殖参数均较低，冬季旱地面积较大，夏季降雨量少。育种成功与泥泞/半淹地呈正相关，与播种地呈负相关。像灰苍鹭一样，其他在L'Albufera de Valencia筑巢的水鸟物种可能依赖于稻田的条件来繁殖成功。在水稻栽培管理中应考虑到它们的繁殖需求。
{"title":"Effects of Rice Field Water Cycles on the Breeding Biology of Grey Heron (Ardea cinerea) and Conservation Implications","authors":"Mariela Forti, G. Florez-Montero, J. S. Monrós, P. Vera","doi":"10.1675/063.045.0311","DOIUrl":"https://doi.org/10.1675/063.045.0311","url":null,"abstract":"Abstract. Wetlands are among the most threatened ecosystems on the planet, largely due to their conversion to agricultural or dry land. L'Albufera de Vàlencia is characterized by a large expanse of rice fields (c. 14,000 ha), which hosts the most important colony of Grey Heron Ardea cinerea on the Mediterranean coast of Spain. The colony was visited every 10 days during February-April of 2016 to 2018 and during May-July of 2015 to 2017. The reproductive parameters were estimated for each year and season. We also monitored the available habitat and habitat use of the species in the rice fields from February 2016 to June 2017. The condition of the rice field was related to reproductive parameters. The breeding period was divided into two stages per year. In 2016 all reproductive parameters were lower values, coinciding with a larger area of dry fields in winter and low rainfall in summer. Breeding success was found to be positively associated with the muddy/semi-flooded fields and negatively associated with the sown fields. Like Grey Heron, other waterbirds species nesting in L'Albufera de Valencia could depend on the condition of the rice fields for breeding success. Their reproductive requirements should be considered in rice cultivation management.","PeriodicalId":54408,"journal":{"name":"Waterbirds","volume":"24 1","pages":"328 - 344"},"PeriodicalIF":0.3,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86598678","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}
Mikayla N. Call, A. Wilke, Zak Poulton, R. Boettcher, S. Karpanty, Eunbi Kwon, Aylett Lipford, Emily D. Gardner, Logan Anderson, J. Fraser, D. Catlin, C. Wails
Abstract. Shorebird reproductive success monitoring often relies on surveys of nest and brood survival. However, conclusions may be inaccurate due to the challenges of gathering and interpreting evidence of nest and brood fate. We tested the efficacy of in-person versus camera-based monitoring to quantify productivity and evaluate threats to reproductive success of American Oystercatchers (Haematopus palliatus) and Piping Plovers (Charadrius melodus) at Metompkin Island, Virginia. We deployed 73 cameras using three set-ups: at nests, at brood sites, and along a transect. The same areas were also surveyed in-person approximately once per week. Camera monitoring confirmed nest fate where in-person monitors could not determine fate from field evidence and provided insight to the effectiveness of mammalian predator removal. However, cameras failed to capture causes of mortality for mobile chicks and did not consistently document chicks where in-person monitoring confirmed successful broods. Cameras produced large quantities of data requiring 63.5–315 hours to review, depending on camera set-up. We found cameras were useful for validating conclusions from in-person monitoring, highlighting threats that surveys missed, and characterizing the predator community. Managers should consider the tradeoff between potential benefits and required effort of camera monitoring when deciding which method would be effective for meeting management goals.
{"title":"Comparing In-Person Versus Camera Monitoring of Shorebird Reproductive Success","authors":"Mikayla N. Call, A. Wilke, Zak Poulton, R. Boettcher, S. Karpanty, Eunbi Kwon, Aylett Lipford, Emily D. Gardner, Logan Anderson, J. Fraser, D. Catlin, C. Wails","doi":"10.1675/063.045.0310","DOIUrl":"https://doi.org/10.1675/063.045.0310","url":null,"abstract":"Abstract. Shorebird reproductive success monitoring often relies on surveys of nest and brood survival. However, conclusions may be inaccurate due to the challenges of gathering and interpreting evidence of nest and brood fate. We tested the efficacy of in-person versus camera-based monitoring to quantify productivity and evaluate threats to reproductive success of American Oystercatchers (Haematopus palliatus) and Piping Plovers (Charadrius melodus) at Metompkin Island, Virginia. We deployed 73 cameras using three set-ups: at nests, at brood sites, and along a transect. The same areas were also surveyed in-person approximately once per week. Camera monitoring confirmed nest fate where in-person monitors could not determine fate from field evidence and provided insight to the effectiveness of mammalian predator removal. However, cameras failed to capture causes of mortality for mobile chicks and did not consistently document chicks where in-person monitoring confirmed successful broods. Cameras produced large quantities of data requiring 63.5–315 hours to review, depending on camera set-up. We found cameras were useful for validating conclusions from in-person monitoring, highlighting threats that surveys missed, and characterizing the predator community. Managers should consider the tradeoff between potential benefits and required effort of camera monitoring when deciding which method would be effective for meeting management goals.","PeriodicalId":54408,"journal":{"name":"Waterbirds","volume":"19 1","pages":"312 - 327"},"PeriodicalIF":0.3,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73984187","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}
A. Diallo, T. Piersma, Arne O. K. Van Eerden, S. Ndiaye, P. Ndiaye
Abstract. Senegal hosts hundreds of wintering Eurasian Spoonbills Platalea leucorodia every year. To contribute to the paucity of knowledge on their distribution and ecology, this study aimed to compare the occurrence and behaviour of spoonbills at the three most important sites in Senegal: Djoudj National Park, Technopôle of Dakar and Palmarin Reserve. Based on monthly counts in 2017 and 2018, Djoudj reached peak numbers of more than 2500 birds in April. The number in Palmarin peaked at 500 birds in October. In both cases this well exceeds the 1% threshold for the East Atlantic Flyway population, but Djoudj can hold up to a sixth of the population. Technopôle is an intermediate site that rarely hosts more than 50 individuals. Based on the scanning of behaviours throughout the day, we show that foraging activity was high early in the morning and decreased towards noon. At Palmarin, Spoonbills spent more time resting (68%) than at Djoudj (50%), allocating less time to foraging (16%) compared with Djoudj (29%). If this indicates favourable wintering habitat at Palmarin, the growing population of Eurasian Spoonbills from Europe may increasingly rely on the Palmarin site during the coming decade.
{"title":"Seasonal Occurrence and Daytime Behaviour of Eurasian Spoonbills Platalea leucorodia leucorodia in Senegal's Atlantic Coastal Areas","authors":"A. Diallo, T. Piersma, Arne O. K. Van Eerden, S. Ndiaye, P. Ndiaye","doi":"10.1675/063.045.0210","DOIUrl":"https://doi.org/10.1675/063.045.0210","url":null,"abstract":"Abstract. Senegal hosts hundreds of wintering Eurasian Spoonbills Platalea leucorodia every year. To contribute to the paucity of knowledge on their distribution and ecology, this study aimed to compare the occurrence and behaviour of spoonbills at the three most important sites in Senegal: Djoudj National Park, Technopôle of Dakar and Palmarin Reserve. Based on monthly counts in 2017 and 2018, Djoudj reached peak numbers of more than 2500 birds in April. The number in Palmarin peaked at 500 birds in October. In both cases this well exceeds the 1% threshold for the East Atlantic Flyway population, but Djoudj can hold up to a sixth of the population. Technopôle is an intermediate site that rarely hosts more than 50 individuals. Based on the scanning of behaviours throughout the day, we show that foraging activity was high early in the morning and decreased towards noon. At Palmarin, Spoonbills spent more time resting (68%) than at Djoudj (50%), allocating less time to foraging (16%) compared with Djoudj (29%). If this indicates favourable wintering habitat at Palmarin, the growing population of Eurasian Spoonbills from Europe may increasingly rely on the Palmarin site during the coming decade.","PeriodicalId":54408,"journal":{"name":"Waterbirds","volume":"22 1","pages":"199 - 205"},"PeriodicalIF":0.3,"publicationDate":"2023-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74916120","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}
Abstract. Understanding important factors for breeding Eared Grebes (Podiceps nigricollis) is essential for its conservation. We aimed to study the impact of some factors on nests and breeding success in this species in fishponds (S Poland). Number of Eared Grebe nests were counted on particular carp ponds. Pond size, vegetation cover, number of nests in colonies of associated gull or tern species, and age of stocked common carp (Cyprinus carpio) were determined for all ponds with nests. We also investigated the relationship between nest size, material used to construct them and clutch size. Number of Eared Grebe nests positively correlated with number of breeding pairs of associated colonial species (terns or gulls). Selection of the breeding site by the Eared Grebe can be explained by appropriate nest protection by large colonies of associated species (Whiskered Tern Chlidonias hybrida and Black-headed Gull Chroicocephalus ridibundus). Nest size was not related to clutch size. A negative relationship between breeding success and number of nests of Eared Grebe was found. Food is a not limiting factor for the Eared Grebe on fishponds with extensive production, and presumably other factors such as weather conditions may explain the low breeding success of this species.
{"title":"Factors Affecting Colony Size and Breeding Parameters of Eared Grebe (Podiceps nigricollis) in Carp Ponds","authors":"R. Gwiazda, A. Flis, M. Ledwoń, D. Wiehle","doi":"10.1675/063.045.0203","DOIUrl":"https://doi.org/10.1675/063.045.0203","url":null,"abstract":"Abstract. Understanding important factors for breeding Eared Grebes (Podiceps nigricollis) is essential for its conservation. We aimed to study the impact of some factors on nests and breeding success in this species in fishponds (S Poland). Number of Eared Grebe nests were counted on particular carp ponds. Pond size, vegetation cover, number of nests in colonies of associated gull or tern species, and age of stocked common carp (Cyprinus carpio) were determined for all ponds with nests. We also investigated the relationship between nest size, material used to construct them and clutch size. Number of Eared Grebe nests positively correlated with number of breeding pairs of associated colonial species (terns or gulls). Selection of the breeding site by the Eared Grebe can be explained by appropriate nest protection by large colonies of associated species (Whiskered Tern Chlidonias hybrida and Black-headed Gull Chroicocephalus ridibundus). Nest size was not related to clutch size. A negative relationship between breeding success and number of nests of Eared Grebe was found. Food is a not limiting factor for the Eared Grebe on fishponds with extensive production, and presumably other factors such as weather conditions may explain the low breeding success of this species.","PeriodicalId":54408,"journal":{"name":"Waterbirds","volume":"203 1","pages":"134 - 140"},"PeriodicalIF":0.3,"publicationDate":"2023-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72949470","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":"Editorial: It is Raining Status Reports","authors":"K. S. Gopi Sundar","doi":"10.1675/063.045.0201","DOIUrl":"https://doi.org/10.1675/063.045.0201","url":null,"abstract":"","PeriodicalId":54408,"journal":{"name":"Waterbirds","volume":"14 1","pages":"i - v"},"PeriodicalIF":0.3,"publicationDate":"2023-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86664568","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}
Abstract. Heron vocalization and its behavioral functions are one of the least researched aspects of heron biology. The main aim of this study was to investigate the patterns of seasonal and daily vocal output of male Little Bittern (Ixobrychus m. minutus; n = 8) during the breeding season (May–August). The advertising call started on 10th May, and finished on 28th July. The first peak of calling activity occurred between 21st May and 1st June, and the second one was between 14th June and 7th July. The daily vocal activity fluctuated and depended on the time of day. The males were most active between 0300–0900 hours and 1600–2200 hours, with the highest peaks in vocal output occurring before sunrise and before sunset. Higher vocal activity was observed in the evening compared to the morning hours. Moreover, the vocal activity of males was not related to air temperature.
摘要苍鹭的发声及其行为功能是苍鹭生物学中研究最少的一个方面。本研究的主要目的是研究雄性小卤(Ixobrychus m. minutus)的季节性和每日声音输出模式;繁殖期(5 - 8月)n = 8)。广告从5月10日开始，7月28日结束。第一个呼叫高峰发生在5月21日至6月1日，第二个呼叫高峰发生在6月14日至7月7日。每天的声音活动是波动的，并取决于一天中的时间。雄性在0300-0900小时和1600-2200小时之间最活跃，日出前和日落前的声音输出达到最高峰。与早晨相比，晚上观察到更高的声音活动。此外，雄性的发声活动与气温无关。
{"title":"Vocal Activity of Little Bittern (Ixobrychus m. minutus) during the Breeding Season","authors":"A. Flis","doi":"10.1675/063.045.0212","DOIUrl":"https://doi.org/10.1675/063.045.0212","url":null,"abstract":"Abstract. Heron vocalization and its behavioral functions are one of the least researched aspects of heron biology. The main aim of this study was to investigate the patterns of seasonal and daily vocal output of male Little Bittern (Ixobrychus m. minutus; n = 8) during the breeding season (May–August). The advertising call started on 10th May, and finished on 28th July. The first peak of calling activity occurred between 21st May and 1st June, and the second one was between 14th June and 7th July. The daily vocal activity fluctuated and depended on the time of day. The males were most active between 0300–0900 hours and 1600–2200 hours, with the highest peaks in vocal output occurring before sunrise and before sunset. Higher vocal activity was observed in the evening compared to the morning hours. Moreover, the vocal activity of males was not related to air temperature.","PeriodicalId":54408,"journal":{"name":"Waterbirds","volume":"52 1","pages":"213 - 217"},"PeriodicalIF":0.3,"publicationDate":"2023-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85164726","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}
Abstract. Stopover habitats in long-distance migrants such as Siberian Cranes (Leucogeranus leucogeranus) are subject to dynamic changes, both seasonally and spatially. Due to the difficulty in conserving stopover habitats across vast geographies, it is necessary to clarify the timing and route patterns of stopover sites in order to take practical measures to protect habitats. From 2014 to 2018, we successfully tracked n = 10 Siberian Cranes by satellite tracking and obtained data for n = 26 complete migrations. We obtained the annual cycle of cranes and analyzed the repeatability between seasons and individuals. According to tracking data, Siberian Cranes started and ended autumn migration on 23 September and 19 November, respectively. Spring migration started on 8 April and ended on 4 June. The migration routes between seasons showed spatial similarity but less repeatability. There is significant repeatability in migration routes from 48°N to 58°N (Russian areas) between individuals in spring. Our results provide support for some seasonal plasticity in the timing of migration and flexibility in routes taken by migrating Siberian Cranes. Other than rigid patrol and guardianship for the entire spring, we also propose strengthening monitoring and protection in the identified stopover areas from the end of March to the beginning of May each year.
{"title":"Siberian Crane Migration: Individuals Repeat Timing and Route in Spring Migration","authors":"Xiuming Li, Kaijun Pan, Haixiang Zhou, F. Qian","doi":"10.1675/063.045.0202","DOIUrl":"https://doi.org/10.1675/063.045.0202","url":null,"abstract":"Abstract. Stopover habitats in long-distance migrants such as Siberian Cranes (Leucogeranus leucogeranus) are subject to dynamic changes, both seasonally and spatially. Due to the difficulty in conserving stopover habitats across vast geographies, it is necessary to clarify the timing and route patterns of stopover sites in order to take practical measures to protect habitats. From 2014 to 2018, we successfully tracked n = 10 Siberian Cranes by satellite tracking and obtained data for n = 26 complete migrations. We obtained the annual cycle of cranes and analyzed the repeatability between seasons and individuals. According to tracking data, Siberian Cranes started and ended autumn migration on 23 September and 19 November, respectively. Spring migration started on 8 April and ended on 4 June. The migration routes between seasons showed spatial similarity but less repeatability. There is significant repeatability in migration routes from 48°N to 58°N (Russian areas) between individuals in spring. Our results provide support for some seasonal plasticity in the timing of migration and flexibility in routes taken by migrating Siberian Cranes. Other than rigid patrol and guardianship for the entire spring, we also propose strengthening monitoring and protection in the identified stopover areas from the end of March to the beginning of May each year.","PeriodicalId":54408,"journal":{"name":"Waterbirds","volume":"39 1","pages":"125 - 133"},"PeriodicalIF":0.3,"publicationDate":"2023-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84207536","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}
D. Prosser, Jeffery D. Sullivan, Christopher J. Gilbert, D. Brinker, P. C. Mcgowan, Carl R. Callahan, Ben Hutzell, Laurence E. Smith
Abstract. Population estimates derived from monitoring efforts can be sensitive to the survey method selected, potentially leading to biased estimates and low precision relative to true population size. While small unmanned aerial systems (UAS) present a unique opportunity to survey avian populations while limiting disturbance, relatively little is known about how this method compares with more traditional approaches. In this study we compared population estimates of Snowy (Egretta thula) and Cattle Egrets (Bubulcus ibis) in a mixed-species colony in the Chesapeake Bay (Maryland, USA) derived from UAS photo counts, flush counts, flight-line surveys, and in-colony nest counts along with the time required to derive an estimate via each approach. We found that UAS counts and flush counts produced lower pair estimates than nest counts and flight-line surveys (P < 0.05), and required dramatically less time (x̄ = 6, 8, 84 and 90 min, respectively). These results suggest that while UAS have the potential to collect valuable survey data from breeding colonies that are hard to reach or are especially sensitive to the disturbance inherent in other methods, inherent biases should be considered and caution should be used when comparing results between survey types.
{"title":"A Comparison of Direct & Indirect Survey Methods for Estimating Colonial Nesting Waterbird Populations","authors":"D. Prosser, Jeffery D. Sullivan, Christopher J. Gilbert, D. Brinker, P. C. Mcgowan, Carl R. Callahan, Ben Hutzell, Laurence E. Smith","doi":"10.1675/063.045.0209","DOIUrl":"https://doi.org/10.1675/063.045.0209","url":null,"abstract":"Abstract. Population estimates derived from monitoring efforts can be sensitive to the survey method selected, potentially leading to biased estimates and low precision relative to true population size. While small unmanned aerial systems (UAS) present a unique opportunity to survey avian populations while limiting disturbance, relatively little is known about how this method compares with more traditional approaches. In this study we compared population estimates of Snowy (Egretta thula) and Cattle Egrets (Bubulcus ibis) in a mixed-species colony in the Chesapeake Bay (Maryland, USA) derived from UAS photo counts, flush counts, flight-line surveys, and in-colony nest counts along with the time required to derive an estimate via each approach. We found that UAS counts and flush counts produced lower pair estimates than nest counts and flight-line surveys (P < 0.05), and required dramatically less time (x̄ = 6, 8, 84 and 90 min, respectively). These results suggest that while UAS have the potential to collect valuable survey data from breeding colonies that are hard to reach or are especially sensitive to the disturbance inherent in other methods, inherent biases should be considered and caution should be used when comparing results between survey types.","PeriodicalId":54408,"journal":{"name":"Waterbirds","volume":"40 1","pages":"189 - 198"},"PeriodicalIF":0.3,"publicationDate":"2023-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86668626","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}
David C. Lumpkin, S. Jennings, Nils Warnock, T. E. Condeso
Abstract. Migratory behavior of California Great Egrets (Ardea alba) is poorly understood. GPS tags were deployed on eleven Great Egrets on Tomales Bay, Marin County, California, USA. Six individuals displayed migratory behavior, four remained resident, and one individual employed both strategies across three winters. Both diurnal and nocturnal migratory movements were observed. Five of the Great Egrets flew through or wintered in the Sacramento-San Joaquin Delta and California's Central Valley, and one Great Egret moved through Nevada, Arizona, and Mexico, indicating use of wintering grounds outside of California. This study provides the first documentation of partial migration by Great Egrets, and the first information on round trip migration of this species on the U.S. west coast. Our results further illustrate the importance of connectivity between coastal and inland habitats for migratory birds.
{"title":"Partial Migration by Great Egrets Ardea alba in Coastal California","authors":"David C. Lumpkin, S. Jennings, Nils Warnock, T. E. Condeso","doi":"10.1675/063.045.0205","DOIUrl":"https://doi.org/10.1675/063.045.0205","url":null,"abstract":"Abstract. Migratory behavior of California Great Egrets (Ardea alba) is poorly understood. GPS tags were deployed on eleven Great Egrets on Tomales Bay, Marin County, California, USA. Six individuals displayed migratory behavior, four remained resident, and one individual employed both strategies across three winters. Both diurnal and nocturnal migratory movements were observed. Five of the Great Egrets flew through or wintered in the Sacramento-San Joaquin Delta and California's Central Valley, and one Great Egret moved through Nevada, Arizona, and Mexico, indicating use of wintering grounds outside of California. This study provides the first documentation of partial migration by Great Egrets, and the first information on round trip migration of this species on the U.S. west coast. Our results further illustrate the importance of connectivity between coastal and inland habitats for migratory birds.","PeriodicalId":54408,"journal":{"name":"Waterbirds","volume":"58 1","pages":"150 - 158"},"PeriodicalIF":0.3,"publicationDate":"2023-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76985687","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}
Treena L. Ferguson, D. King, B. Rude, W. Baumgartner, C. Huston, B. Strickland, F. Cunningham
Abstract. A presumptive natural West Nile virus outbreak occurred in 23 of 27 captive American White Pelicans (Pelecanus erythrorhynchos) located in Starkville, Mississippi. Twenty-one birds were confirmed positive through either reverse transcriptase PCR, immunohistochemistry (IHC) or complement fixation serological testing. Two additional birds were presumed positive by histological changes typically ascribed to West Nile virus. Two of the 23 infected pelicans had been previously implanted with a temperature monitor and served as case studies. These birds began showing clinical signs in July on day 27 and 30 post-placement, preceded by a reduction in food intake one day prior in both cases. Initial clinical signs observed in both birds included wing droop and lethargy and within 72 hours both birds displayed increased agitation and aggression during feeding. Here we detail the progression of disease caused by West Nile virus in two cases.
{"title":"Natural West Nile Virus Infections in Captive Raised American White Pelicans (Pelecanus erythrorhynchos).","authors":"Treena L. Ferguson, D. King, B. Rude, W. Baumgartner, C. Huston, B. Strickland, F. Cunningham","doi":"10.1675/063.045.0211","DOIUrl":"https://doi.org/10.1675/063.045.0211","url":null,"abstract":"Abstract. A presumptive natural West Nile virus outbreak occurred in 23 of 27 captive American White Pelicans (Pelecanus erythrorhynchos) located in Starkville, Mississippi. Twenty-one birds were confirmed positive through either reverse transcriptase PCR, immunohistochemistry (IHC) or complement fixation serological testing. Two additional birds were presumed positive by histological changes typically ascribed to West Nile virus. Two of the 23 infected pelicans had been previously implanted with a temperature monitor and served as case studies. These birds began showing clinical signs in July on day 27 and 30 post-placement, preceded by a reduction in food intake one day prior in both cases. Initial clinical signs observed in both birds included wing droop and lethargy and within 72 hours both birds displayed increased agitation and aggression during feeding. Here we detail the progression of disease caused by West Nile virus in two cases.","PeriodicalId":54408,"journal":{"name":"Waterbirds","volume":"44 1","pages":"206 - 212"},"PeriodicalIF":0.3,"publicationDate":"2023-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77964608","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}
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