scholarly journals Measurement of chlorinated dioxins, furans and PCBs in Ardea alba Great Egret, and Puffinus puffinus Manx Shearwater: Ilha Grande Bay, Rio de Janeiro, Brazil

2012 ◽  
Vol 12 (1) ◽  
pp. 7-15
Author(s):  
Aldo Pacheco Ferreira
Keyword(s):  
Rio De Janeiro ◽  
Great Egret ◽  
Ardea Alba ◽  
Chlorinated Dioxins ◽  
Manx Shearwater

scholarly journals Waterbirds catch and release a poisonous fish at a mudflat in southeastern Australia

2019 ◽  
Vol 27 (2) ◽  
pp. 126-128
Author(s):  
Ivan Sazima
Keyword(s):  
Visually Guided ◽  
Great Egret ◽  
Catch And Release ◽  
Southeastern Australia ◽  
Ardea Alba ◽  
Waterbird Species ◽  
Sensory Mode ◽  
Poisonous Fish

AbstractSeveral waterbird species prey on fishes, and usually use only one sensory mode to detect this prey: herons hunt visually guided, whereas ibises mostly search tactilely guided. I report herein events in which a heron and an ibis caught and released a poisonous fish at a mudflat in southeastern Australia. A Great Egret (Ardea alba) that targeted small gerreid fishes caught and immediately released the very toxic pufferfish Tetractenos hamiltoni, with bill washing and discomfort movements afterwards. Two Australian White Ibises (Threskiornis molucca) that probed for bottom-dwelling fishes and crabs caught and handled these pufferfishes for about 60 s, before releasing them. Next, the birds dipped the bill in the water and resumed hunting. Pufferfishes are rarely preyed on by birds, but an Australian bird that feeds on this fish type is the Silver Gull (Chroicocephalus novaehollandiae), which eats the pufferfish Torquigener pleurogramma when it is nontoxic or less harmful.

scholarly journals Microhabitat use by three species of egret (Pelecaniformes, Ardeidae) in southern Brazil

2013 ◽  
Vol 73 (4) ◽  
pp. 791-796 ◽  
Author(s):  
DP. Pinto ◽  
CC. Chivittz ◽  
FB. Bergmann ◽  
AM. Tozetti
Keyword(s):  
Air Temperature ◽  
Vegetation Cover ◽  
Microhabitat Use ◽  
Southern Brazil ◽  
Air Humidity ◽  
Great Egret ◽  
Bubulcus Ibis ◽  
Ardea Alba ◽  
Relative Air Humidity

In the present study, we examined the role of different habitat components and their relationship with microhabitat use by three species of egret: Cocoi heron (Ardea cocoi), Great egret (Ardea alba), and Cattle egret (Bubulcus ibis), in wetlands of southern Brazil. Ardea alba and A. cocoi were not habitat-specific (e.g. vegetation cover and flooding level). Conversely, B. ibis was associated with drier microhabitats. Relative air humidity and air temperature were the main variables which correlated with the occurrence of these species and supported the plasticity of B. ibis and its predominance in drier habitats.

scholarly journals Clinostomum album n. sp. and Clinostomum marginatum (Rudolphi, 1819), parasites of the great egret Ardea alba L. from Mississippi, USA

2017 ◽  
Vol 94 (1) ◽  
pp. 35-49 ◽  
Author(s):  
Thomas G. Rosser ◽  
Neely R. Alberson ◽  
Ethan T. Woodyard ◽  
Fred L. Cunningham ◽  
Linda M. Pote ◽  
...  
Keyword(s):  
Great Egret ◽  
Ardea Alba

Great Egret (Ardea alba)

2020 ◽  
Author(s):  
Donald A. McCrimmon Jr. ◽  
John C. Ogden ◽  
G. Thomas Bancroft ◽  
Albert Martínez-Vilalta ◽  
Anna Motis ◽  
...  
Keyword(s):  
Great Egret ◽  
Ardea Alba

scholarly journals Factors Influencing the Nest Predatory Behaviors of Common Ravens in Heronries

The Condor ◽  
2005 ◽  
Vol 107 (2) ◽  
pp. 402-415 ◽  
Author(s):  
John P. Kelly ◽  
Katherine L. Etienne ◽  
Jennifer E. Roth
Keyword(s):  
San Francisco ◽  
Nest Predation ◽  
Great Egret ◽  
Corvus Corax ◽  
Regional Monitoring ◽  
Bay Area ◽  
Ardea Alba ◽  
Energy Needs ◽  
Foraging Experience ◽  
Colony Site

AbstractAn investigation of nest predation and associated foraging behaviors by resident Common Ravens (Corvus corax) indicated that occupation of heronries, predation of Great Egret (Ardea alba) nests, duration of patrol flights, landing rates, and number of interactions with ardeids varied with the productivity of resident ravens. Annual increases in raven predatory behaviors were consistent with increases in foraging experience for a few to several years after ravens became resident at colony sites. However, overall nest predation did not increase at three sites from 1999–2004, and at one of these sites, predation did not differ from levels measured before ravens were resident, suggesting that ravens may have interfered with the nest predatory activities of other species. Ravens at one colony site obtained most or all of their energy needs from the heronry. Predation of Great Egret nestlings was most likely 14–29 days after first hatch, when parental attendance begins to decline. Regional monitoring of heronries in the San Francisco Bay area, California, indicated highly variable rates of nest predation by Common Ravens and a low overall presence of ravens, even though ravens occurred throughout the region. Implications for conservation include the potential value of manipulating raven reproduction to limit nest predation, exclusion of other nest predators by resident ravens, annual increases in nest predatory behaviors, and the importance of regional monitoring to substantiate concerns about raven predation.Factores que Influencian las Conductas de Corvus corax como Depredadores de Nidos en Colonias de GarzasResumen. Una investigación de la depredación de nidos y de las conductas asociadas de cuervos de la especie Corvus corax indicaron que la ocupación de colonias de garzas, la depredación de los nidos de Ardea alba, la duración de los vuelos de patrullaje, las tasas de aterrizaje y el número de interacciones con ardeidos varió con la productividad de los cuervos residentes. Los incrementos anuales de las conductas depredadoras de los cuervos fueron consistentes con los aumentos en la experiencia de forrajeo de unos pocos a varios años, a partir de que los cuervos se incorporaron como residentes en las colonias. Sin embargo, la depredación global de nidos no incrementó en los tres sitios entre 1999 y 2004, y en uno de los sitios la depredación no varió con relación a los niveles medidos antes de que los cuervos fueran residentes, lo que sugiere que los cuervos pueden haber interferido con las actividades de depredación de nidos de otras especies. Los cuervos de una colonia obtuvieron la mayoría o todas sus necesidades energéticas de las colonias de garzas. La depredación de los pichones fue más probable entre los 14 y los 29 días luego de la primera eclosión, cuando la asistencia de los padres comienza a disminuir. El monitoreo regional de las garzas en el área de la bahía de San Francisco, California, indicó la existencia de tasas de depredación de nidos por parte de C. corax altamente variables y una presencia general baja de cuervos, aunque estas aves estuvieron presentes en toda la región. Las implicancias para la conservación incluyen el valor potencial de manipular la reproducción de C. corax para limitar la depredación de nidos, la exclusión de otros depredadores de nidos por parte de cuervos residentes, incrementos anuales en comportamientos de depredación de nidos y la importancia del monitoreo regional para verificar las preocupaciones sobre la depredación de nidos.

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