ardea alba
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PLoS ONE ◽  
2021 ◽  
Vol 16 (12) ◽  
pp. e0261963
Author(s):  
Scott Jennings ◽  
David Lumpkin ◽  
Nils Warnock ◽  
T. Emiko Condeso ◽  
John P. Kelly

Movement by animals to obtain resources and avoid predation often depends on natural cycles, and human alteration of the landscape may disrupt or enhance the utility of different habitats or resources to animals through the phases of these cycles. We studied habitat selection by GPS/accelerometer-tagged great egrets (Ardea alba) foraging in areas with shellfish aquaculture infrastructure and adjacent natural wetlands, while accounting for tide-based changes in water depth. We used integrated step selection analysis to test the prediction that egrets would express stronger selection for natural wetlands (eelgrass, tidal marsh, and other tidal wetlands) than for shellfish aquaculture areas. We also evaluated differences in foraging behavior among shellfish aquaculture areas and natural wetlands by comparing speed travelled (estimated from distance between GPS locations) and energy expended (Overall Dynamic Body Acceleration) while foraging. We found evidence for stronger overall habitat selection for eelgrass than for shellfish aquaculture areas, with results conditional on water depth: egrets used shellfish aquaculture areas, but only within a much narrower range of water depths than they used eelgrass and other natural wetlands. We found only slight differences in our metrics of foraging behavior among shellfish aquaculture areas and natural wetlands. Our results suggest that although great egrets appear to perceive or experience shellfish aquaculture areas as suitable foraging habitat during some conditions, those areas provide less foraging opportunity throughout tidal cycles than natural wetlands. Thus, expanding the footprint of shellfish aquaculture into additional intertidal areas may reduce foraging opportunities for great egrets across the range of tidal cycles. Over longer time scales, the ways in which natural wetlands and shellfish aquaculture areas adapt to rising sea levels (either through passive processes or active management) may change the ratios of these wetland types and consequently change the overall value of Tomales Bay to foraging great egrets.


Waterbirds ◽  
2021 ◽  
Vol 44 (1) ◽  
Author(s):  
John N. Brzorad ◽  
Gwen C. Bachman ◽  
Alan D. Maccarone

2021 ◽  
Vol 38 (2) ◽  
Author(s):  
Green Choi ◽  
Hyung-Kyu Nam ◽  
Seok-Jun Son ◽  
Min Seock Do ◽  
Jeong-Chil Yoo

2021 ◽  
Author(s):  
Mayara Grego Caiaffa ◽  
André Luiz Mota da Costa ◽  
Bruna Emely Pereira Barbosa ◽  
Daphnne Chelles Marins ◽  
Jéssica Martins de Ugalde ◽  
...  
Keyword(s):  

Author(s):  
Daniel Luis Zanella Kantek ◽  
Roselaine Carvalho de Melo ◽  
Selma Samiko Miyazaki ◽  
Welvis Felipe Fernandes Castilheiro ◽  
Manoel dos Santos Filho
Keyword(s):  

Maior planície de inundação do mundo, o Pantanal desempenha um papel importante na manutenção da diversidade biológica. A Estação Ecológica de Taiamã (EET) é uma unidade de conservação localizada no norte do Pantanal e é considerada uma área relevante para a conservação de aves. A composição de espécies dessa área deve ser estudada e conhecida para a elaboração de planos de manejo específicos. Além disso, as aves aquáticas são importantes na avaliação da qualidade ambiental e com alta sensibilidade a possíveis alterações. Assim, investigamos a composição das aves aquáticas da EET e entorno e avaliamos os níveis de riqueza e abundância entre os locais e o nível do rio durante um ano de amostragem. Foi realizado um esforço amostral total de seis campanhas, com quatro locais amostrados: dois na EET e dois nos arredores. Identificamos um total de 45 espécies de aves aquáticas, divididas em nove ordens, 20 famílias e 36 gêneros. O grande número de indivíduos observado em fevereiro de 2012 pode estar relacionado a um fenômeno natural que ocorre no Pantanal, chamado dequada, o qual está associado aos processos de decomposição da biomassa submersa das plantas no início da cheia anual do bioma. Ao analisar as espécies mais comuns neste estudo, foi verificado que as abundâncias de Nannopterum brasilianus, Ardea alba e Butorides striata aumentaram durante esse período. A maior abundância e o maior número de espécies foram observados no local de amostragem dentro da EET, de forma que a existência dessa área protegida para conservação é um fator significativo para a manutenção das comunidades de aves da região. Desta forma, fica evidenciada a importância de áreas protegidas para a conservação de aves no Pantanal. Atualmente, uma parcela muito pequena (5,37%) do bioma está protegida; portanto, aumentar essa proporção deve ajudar na manutenção dos habitat existentes. Pesquisas subsequentes devem ser conduzidas para corroborar ou refutar as tendências sazonais observadas neste estudo.


Diversity ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 371
Author(s):  
Dan Traian Ionescu ◽  
Călin Vasile Hodor ◽  
Ion Cătălin Petritan

The historical loss of natural wetlands in Romania is significant. The building of lakes, ponds, and dams has compensated for some of these losses, as was the case in the study area, the artificial wetlands designated as the Natura 2000 (special protection area, SPA) and Ramsar sites. In this context, to evaluate the conservation status of colonial waterbirds (cormorants, herons, and egrets), we analyzed actual distributions, habitat selection, features, and population sizes. Standardized counting of colonial species was used, supplemented by nest counting and colony-area estimation during winter, and drone footage. All species and their colonies were built in artificial or anthropically influenced habitats. Concerning distribution and population sizes, Phalacrocorax carbo and Microcarbo pygmeus were found to nest only in central Romania. The pair numbers of Ardea alba, Ardea purpurea, Ardea cinerea, and Nycticorax nycticorax in the area exceeded 1% of the national minimum breeding population. There was a statistically significant positive trend of breeding populations for Ardea alba, Nycticorax nycticorax, and Egretta garzetta. In conclusion, these artificial wetlands offer optimal breeding conditions for a relatively large diversity of colonial bird species over areas that are not very large.


2020 ◽  
Vol 11 (2) ◽  
Author(s):  
Fabiana Fedatto Bernardon ◽  
Ana Luisa Schifino Valente ◽  
Gertrud Müller

Se examinaron 44 ejemplares pertenecientes a las nueve especies de Ardeidae del extremo sur del estado de Rio Grande do Sul. El objetivo del estudio fue relatar la ocurrencia de las especies de helmintos para las aves, cuantificar las infecciones por especie hospedadora, además de presentar una revisión de helmintos de Ardeidae de Brasil. Las aves acuáticas fueron positivas para 18 tasas, cinco Nematoda, nueve Trematoda y cuatro Acanthocephala. Los nuevos registros de helmintos para Ardeidae en Brasil fueron reportados. Ardea cocoi y Ardea alba se destacaron por el número de especies asociadas.


2020 ◽  
Vol 49 (6) ◽  
pp. 805-813
Author(s):  
Elton Luís Ritir Oliveira ◽  
Keylla H. N. Pacifico Pereira ◽  
Daniel Angelo Felippi ◽  
Paolla Nicole Franco ◽  
Fabrício Singaretti Oliveira ◽  
...  

2020 ◽  
Author(s):  
Bruno Ferreira Guilhon ◽  
João Fabrício Mota Rodrigues ◽  
Diva Maria Borges-Nojosa

Abstract Background: It is important that people know the fauna occurring around the city and within it, because people could present a more positive relationship toward animals and valorize the fauna. This knowledge may vary due to cultural features of the region, as well as social characteristics of the person, such as: educational level and frequency of visits to green areas. This study aimed to evaluate if the knowledge about the faunistic diversity of an urban park varied in relation to the profile of the visitors.Methods: Parque Estadual do Cocó is a conservation unit, located in the Fortaleza municipality in Ceará state, which has a very diverse fauna. We collected the data between September and October 2018 using a structured questionnaire applied with 126 park visitors.Results: We observed that visitors only know 31.57% of the fauna of the Parque Estadual do Cocó and usually find 1.05 ± 1.29 animals during the activities realized in the place. “Common marmoset” ( Callithrix jacchus ) and “Great egret” ( Ardea alba ) were the most cited species, with respectively 102 and 63 citations, while “Crab-eating raccoon” ( Procyon cancrivorus ) and “American purple gallinule” ( Porphyrio martinicus ) were the less cited, with 22 and 16 citations. We did not notice a relationship between the knowledge about the Park fauna with frequency of visitation, but we noticed a positive relation between the number of animals sighted and frequency. The most cited source of information about the Park native species was information boards, but there was no relation between the presence of boards with an animal species of the Park and the knowledge of visitor about them.Conclusions: Visitors do not know the species richness of the Park, even with a high frequency of visitation and the presence of information boards about the Park fauna. However, a high frequency of visitation allowed people to see more animals throughout these visitations. Possibly, more direct alternatives to inform visitors about the native fauna of the Park can bring more positive results than just the sightings and simply the presence of information boards.


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