Waterbirds最新文献_第9页

Population Numbers of the Magellanic Penguin along Its Central-Southern Distribution in Argentina: An Update after 25 Years 麦哲伦企鹅在阿根廷中南部分布的种群数量:25年后的更新

IF 0.3 4区生物学

Waterbirds Pub Date : 2022-07-29 DOI: 10.1675/063.044.0411

A. Millones, A. Morgenthaler, P. Gandini, E. Frere

{"title":"Population Numbers of the Magellanic Penguin along Its Central-Southern Distribution in Argentina: An Update after 25 Years","authors":"A. Millones, A. Morgenthaler, P. Gandini, E. Frere","doi":"10.1675/063.044.0411","DOIUrl":"https://doi.org/10.1675/063.044.0411","url":null,"abstract":"Abstract. The overall population size and trend of the Magellanic Penguin (Spheniscus magellanicus) is uncertain and population estimates are available only for few locations. The last complete census along its central-southern distribution range in Argentina, province of Santa Cruz, was made in the 1990s. This study updates the breeding population size along Santa Cruz. Population estimates were compared with the last complete census, and trends were studied when it was possible. With 353,256 estimated breeding pairs, the overall population in Santa Cruz remained relatively stable after 25 years. The Santa Cruz population represents 31% of the Argentine Patagonian coast population and could represent between 22 and 30% of the species' global population. Colony sizes varied between 9 and 127,492 breeding pairs. Changes in abundance differed among locations, with individual colonies showing increasing, decreasing, or stable trends, which suggests that local factors determine population dynamics. The most significant increases (> 40%) were observed in the southern sector of Santa Cruz. Contrary to what was observed at the north of the distribution range in the province of Chubut, where trends of several colonies were inversely related to colony size, in Santa Cruz most of the largest colonies remained stable or even increased from the 1990s onwards.","PeriodicalId":54408,"journal":{"name":"Waterbirds","volume":"24 1","pages":"499 - 508"},"PeriodicalIF":0.3,"publicationDate":"2022-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85678838","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}

引用次数: 1

Foraging Ecology of White-Bellied Heron (Ardea insignis) in the Fast-Flowing Rivers of Namdapha Tiger Reserve, Arunachal Pradesh, India 印度南达帕老虎保护区湍急河流中白腹苍鹭的觅食生态学

IF 0.3 4区生物学

Waterbirds Pub Date : 2022-07-29 DOI: 10.1675/063.044.0401

H. S. Mondal, G. Maheswaran

引用次数: 0

Nest Site Characteristics of Two Endangered Seabirds in Montane Wet Forests on the Island of Kaua‘i, Hawai‘i, USA 美国夏威夷考艾岛山地湿森林中两种濒危海鸟的巢址特征

IF 0.3 4区生物学

Waterbirds Pub Date : 2022-07-29 DOI: 10.1675/063.044.0408

A. Raine, S. Driskill, J. Rothe, Megan Vynne

{"title":"Nest Site Characteristics of Two Endangered Seabirds in Montane Wet Forests on the Island of Kaua‘i, Hawai‘i, USA","authors":"A. Raine, S. Driskill, J. Rothe, Megan Vynne","doi":"10.1675/063.044.0408","DOIUrl":"https://doi.org/10.1675/063.044.0408","url":null,"abstract":"Abstract. The nest site characteristics of two endangered seabird species–the Hawaiian Petrel Pterodroma sandwichensis and Newell's Shearwater Puffinus newelli–on Kaua‘i were considered. Burrows of both species were predominantly found under tree roots or small caves on steep slopes and were associated with native plants, both in the canopy (particularly Metrosideros polymorpha) and the understory (particularly Dicranopteris linearis). There were, however, marked differences between the two species. Hawaiian Petrels were found at higher elevations with a shorter, patchy canopy and more open understory. Models using microhabitat variables were better able to classify burrows than those using landscape topographic metrics, suggesting that metrics describing the immediate area around the burrow are more important to burrow selection. A comparative model indicated that elevation and maximum vegetation height were the strongest variables in classifying between the two species. Understanding microhabitat needs for these species is important for locating new colonies and for the successful implementation of management actions such as colony creation through social attraction. Furthermore, with the spread of Rapid’Ōhi’a Death canker disease Ceratocystis huliohia on Kaua‘i, the heavy reliance by both species on forest dominated by M. polymorpha (the tree killed by this disease) should be of increasing consideration for conservation efforts targeting these species.","PeriodicalId":54408,"journal":{"name":"Waterbirds","volume":"13 1","pages":"472 - 482"},"PeriodicalIF":0.3,"publicationDate":"2022-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90039121","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}

引用次数: 3

A Novel Automated Method for Point-Based Change Detection Increases Estimation Accuracy of Breeding Pairs in Waterbird Colonies 一种新的基于点的自动变化检测方法提高了水鸟种群繁殖对估计的准确性

IF 0.3 4区生物学

Waterbirds Pub Date : 2022-04-12 DOI: 10.1675/063.044.0302

W. Bean, Sharon Dulava, Mark Bauer, Jeff L. Sloan, Orien M Richmond

{"title":"A Novel Automated Method for Point-Based Change Detection Increases Estimation Accuracy of Breeding Pairs in Waterbird Colonies","authors":"W. Bean, Sharon Dulava, Mark Bauer, Jeff L. Sloan, Orien M Richmond","doi":"10.1675/063.044.0302","DOIUrl":"https://doi.org/10.1675/063.044.0302","url":null,"abstract":"Abstract. The number of breeding pairs is an essential indicator for assessing waterbird colony status. Accurate estimates require distinguishing stationary adults (likely to be breeders on nests) from nonstationary adults (likely to be loafing or foraging breeders or non-breeders). High-resolution multi-temporal aerial imagery obtained from manned aircraft, satellites, or unmanned aircraft systems (UAS) can be analyzed to determine bird movements and derive estimates of the number of stationary adults, which corresponds to the number of active nests, and thereby breeding pairs. Automated detection of stationary objects, such as nesting waterbirds, can be complicated by small positional changes of objects, either because of image co-registration errors or because the object slightly shifts position. A non-parametric, point-based approach was developed to distinguish stationary birds from moving birds using sequences of either two or three consecutive remotely-sensed images. This approach was tested with simulated data and during a case study of nesting American White Pelicans (Pelecanus erythrorhynchos). In both cases, the non-parametric point-based approach had higher accuracy than other established methods such as ground counts. Using two consecutive images had higher sensitivity (correct classification of stationary birds) while using three consecutive images had higher specificity (correct classification of nonstationary birds). This novel, multi-temporal nearest-neighbor method is most useful when positional shifts of stationary animals is low between consecutive images.","PeriodicalId":54408,"journal":{"name":"Waterbirds","volume":"10 1","pages":"277 - 288"},"PeriodicalIF":0.3,"publicationDate":"2022-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73289141","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}

引用次数: 0

Identification of Little Tern (Sternula albifrons) Prey in Inland Andong Lake, Korea Using Video Image Analysis 利用视频图像分析识别韩国安东湖内陆地区小燕鸥(Sternula albifrons)猎物

IF 0.3 4区生物学

Waterbirds Pub Date : 2022-04-12 DOI: 10.1675/063.044.0301

Dong-Man Shin, Jeong-ho Han

{"title":"Identification of Little Tern (Sternula albifrons) Prey in Inland Andong Lake, Korea Using Video Image Analysis","authors":"Dong-Man Shin, Jeong-ho Han","doi":"10.1675/063.044.0301","DOIUrl":"https://doi.org/10.1675/063.044.0301","url":null,"abstract":"Abstract. Little Tern (Sternula albifrons) prey composition was studied on a sandy islet in inland Andong Lake, Republic of Korea, during the breeding season (April to July 2018). Two remote-control video cameras with 4K-resolution were set on the islet to identify prey and determine whether prey species composition or size differed among breeding stages. On still images in which terns had prey in their bills (n = 1,275), prey species were identified, classified to five length-categories, and compared among breeding stages. Freshwater fishes dominated the observed diet (100%; 11 species overall), where the landlocked pond smelt (Hypomesus nipponensis; 80.8%) and largemouth bass (Micropterus salmoides; 13.7%) were main prey species. The mean prey length was 51.0 ± 20.89 mm, where 50.1–75.0 mm prey was the most frequent in the diet (42.2%) and varied significantly among breeding stages; 50.1–75.0 mm prey were most frequent during courtship and incubation stages, whereas 1.0–25.0 mm prey were most frequent at the chick-rearing stage. Surface water temperatures exceeded the upper thermal tolerance of the primary prey species at a date coincidental with tern departure from the colony.","PeriodicalId":54408,"journal":{"name":"Waterbirds","volume":"2015 1","pages":"269 - 276"},"PeriodicalIF":0.3,"publicationDate":"2022-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87095376","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}

引用次数: 0

Time-Activity Budget of the Snowy Sheathbill (Chionis albus) Wintering at a Sea Lion (Otaria flavescens) Haul-Out in Argentina 阿根廷，在海狮(Otaria flavescens)拖曳处越冬的雪嘴(Chionis albus)的时间-活动预算

IF 0.3 4区生物学

Waterbirds Pub Date : 2022-04-12 DOI: 10.1675/063.044.0313

M. M. Hernandez, M. P. Berón, F. Zumpano, G. Giardino, J. P. Seco Pon

引用次数: 1

First Insights into the Diet Composition of Madeiran and Monteiro's Storm Petrels (Hydrobates castro and H. monteiroi) Breeding in the Azores 亚速尔群岛马德兰和蒙泰罗风暴海燕(Hydrobates castro和H. monteiroi)繁殖的饮食组成初探

IF 0.3 4区生物学

Waterbirds Pub Date : 2022-04-12 DOI: 10.1675/063.044.0304

A. R. Carreiro, J. Bried, Zoe Deakin, K. B. Jones, R.J. Thomas, W. Symondson, J. Ramos, Renata Medeiros

{"title":"First Insights into the Diet Composition of Madeiran and Monteiro's Storm Petrels (Hydrobates castro and H. monteiroi) Breeding in the Azores","authors":"A. R. Carreiro, J. Bried, Zoe Deakin, K. B. Jones, R.J. Thomas, W. Symondson, J. Ramos, Renata Medeiros","doi":"10.1675/063.044.0304","DOIUrl":"https://doi.org/10.1675/063.044.0304","url":null,"abstract":"Abstract. Although studying the diet of threatened species is crucial in terms of conservation, the diet of the Madeiran Storm Petrel (Hydrobates castro) and the vulnerable, Azores-endemic Monteiro's Storm Petrel (H. monteiroi) is mostly unknown. The only information available to date comes from anecdotal observations, analysis of mercury levels and stable isotopes. Here is presented the first insights into prey consumption by adults and chicks from the two species breeding in the Azores Archipelago, Portugal, in the mid-Atlantic Ocean. The rapidly developing field of metabarcoding was used to identify dietary items from fecal samples, to species level where possible. A total of thirteen fish, five cephalopod, one crustacean and two oligochaete operational taxonomic units (OTUs) were detected. Results suggest that both petrel species feed mainly on myctophid fish. However, differences were detected between the prey species consumed by (i) H. monteiroi and H. castro, (ii) two distinct H. castro populations (Vila and Praia islets), and (iii) chicks and adults within the same population.","PeriodicalId":54408,"journal":{"name":"Waterbirds","volume":"19 1","pages":"300 - 307"},"PeriodicalIF":0.3,"publicationDate":"2022-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73344117","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}

引用次数: 2

Use of Morphometric Measurements of Photographs of a Sexually Dimorphic Bird to Determine Sex 利用两性二态鸟照片的形态测量来确定性别

IF 0.3 4区生物学

Waterbirds Pub Date : 2022-04-12 DOI: 10.1675/063.044.0307

E. Forys, Carly Naundorff, K. M. Kennedy, Paige T. Paddock

{"title":"Use of Morphometric Measurements of Photographs of a Sexually Dimorphic Bird to Determine Sex","authors":"E. Forys, Carly Naundorff, K. M. Kennedy, Paige T. Paddock","doi":"10.1675/063.044.0307","DOIUrl":"https://doi.org/10.1675/063.044.0307","url":null,"abstract":"Abstract. This study investigated if morphological measurements made from digital photographs of banded adult Black Skimmers (Rynchops niger), using alphanumeric field readable leg bands as a scale reference, can be used to determine their sex. Black Skimmers are known for their extreme sexual dimorophism and make an excellent study subject. Measurements made in the field using calipers to determine length of the exposed culmen of skimmer chicks were significantly correlated to measurements made by three technicians using open-source software (ImageJ) measuring the culmen from photographs, with little variability among technicians. To determine sex, ImageJ was used to measure the culmen, bill depth at base, lower mandible and head + culmen lengths from photographs of 24 known sex adult skimmers (11 female, 13 male). Males were significantly larger than females for all four measurements and a stepwise Discriminant Function Analysis (DFA) using all 4 measurements retained exposed culmen and bill depth as the best predictor variables. This model correctly classified 100% of known sex males and females. Using the DFA equation, 40 additional banded skimmers were classified, and it was determined that 46 of the banded skimmers that were photographed as adults were male and 18 were female. Using a field readable band as a reference scale for other measurements may prove useful for research on other sexually dimorphic species that are banded and later photographed in the wild.","PeriodicalId":54408,"journal":{"name":"Waterbirds","volume":"142 1","pages":"324 - 329"},"PeriodicalIF":0.3,"publicationDate":"2022-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77346881","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}

引用次数: 1

Migratory Connectivity and Nesting Behavior in Harlequin Ducks (Histrionicus histrionicus) Based on Light-Level Geolocator Data 基于光照定位器数据的丑角鸭迁徙连通性和筑巢行为

IF 0.3 4区生物学

Waterbirds Pub Date : 2022-04-12 DOI: 10.1675/063.044.0308

B. MacCallum, Alice Paquet, Lisa J. Bate, C. Hammond, Kristina M. Smucker, Lucas J. Savoy, S. Patla, W. Boyd

{"title":"Migratory Connectivity and Nesting Behavior in Harlequin Ducks (Histrionicus histrionicus) Based on Light-Level Geolocator Data","authors":"B. MacCallum, Alice Paquet, Lisa J. Bate, C. Hammond, Kristina M. Smucker, Lucas J. Savoy, S. Patla, W. Boyd","doi":"10.1675/063.044.0308","DOIUrl":"https://doi.org/10.1675/063.044.0308","url":null,"abstract":"Abstract. The Harlequin Duck (Histrionicus histrionicus) is a species of conservation priority in western North America. Harlequin Ducks breed in small, isolated populations and have specific nesting requirements. Archival, light-level geolocators are increasingly being used as a low-cost, non-invasive tracking technology to explore migratory connectivity. From 2015-2019, geolocators were deployed on 70 Harlequin Ducks in breeding streams of the Rocky Mountains, Canada and USA, to obtain information on connectivity (breeding to non-breeding), molt-winter sites, dispersal, and breeding phenology. Twenty-two of the 70 geolocators were retrieved from locations in the Rocky Mountains (Alberta, Canada; Montana and Wyoming, USA) and analyzed using the TwGeos and FLightR R packages. Harlequin Ducks from the warmer climate of northwest Montana migrated in spring and started incubation one to two weeks earlier than ducks in west-central Alberta and the greater Yellowstone area. During the non-breeding period, individuals dispersed along the Pacific coast, from Oregon to the Alaskan Panhandle, independent of breeding site. Females that incubated successfully spent 32-34 days incubating, which is several days longer than what is in the literature. Use of geolocators provided detailed information about migration connectivity and breeding behavior in a cost effective and relatively non-invasive manner.","PeriodicalId":54408,"journal":{"name":"Waterbirds","volume":"1 1","pages":"330 - 342"},"PeriodicalIF":0.3,"publicationDate":"2022-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83124732","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}

引用次数: 0

Spatial and Temporal Patterns of Double-Crested Cormorant (Phalacrocorax auritus) Breeding Over Nine Years in Biscayne National Park, Florida 佛罗里达州比斯坎国家公园双冠鸬鹚9年繁殖的时空格局

IF 0.3 4区生物学

Waterbirds Pub Date : 2022-04-12 DOI: 10.1675/063.044.0303

Donna M. Marain, K. Whelan, Robert Muxo

{"title":"Spatial and Temporal Patterns of Double-Crested Cormorant (Phalacrocorax auritus) Breeding Over Nine Years in Biscayne National Park, Florida","authors":"Donna M. Marain, K. Whelan, Robert Muxo","doi":"10.1675/063.044.0303","DOIUrl":"https://doi.org/10.1675/063.044.0303","url":null,"abstract":"Abstract. Birds have been monitored as indicators of ecosystem health in both the freshwater and marine habitats of south Florida, USA for decades. This study reports on nine years (2010-2018) of monthly systematic surveys of breeding waterbird colonies in Biscayne National Park. Overall, 89% of active nests in the park belonged to Double-crested Cormorants (Phalacrocorax auritus). The annual sum of nest counts within the study area grew by 58% over the course of the study. This growth in the nesting population is driven by a 61% growth in northern colonies. During this same time period, the southern colonies declined to less than half their original size. These opposing trends coincide with differences in habitat quality (salinity, chlorophyll, sea grass density, and/or prey abundance) between the two regions. In addition, Hurricane Irma strongly impacted the nesting Double-crested Cormorants, suggesting a loss of nearly 400 nests, although four months post-storm nesting was back to normal levels. Finally, two colonies appear to have started during the study period in close proximity to recently completed Biscayne Bay Coastal Wetlands restoration projects. One of these colonies supported a maximum of over 350 nests.","PeriodicalId":54408,"journal":{"name":"Waterbirds","volume":"478 1","pages":"289 - 299"},"PeriodicalIF":0.3,"publicationDate":"2022-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74709348","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}

引用次数: 0