Great Egret (Ardea alba)

McCrimmon, Donald A.; Ogden, John C.; Bancroft, G. Thomas; Martı́nez-Vilalta, Albert; Motis, Anna; Kirwan, Guy M.; Boesman, Peter F. D.

doi:10.2173/bow.greegr.01

Cited by 8 publications

(5 citation statements)

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“…Heron use did not differ between living shorelines and natural marshes, indicating that living shorelines provide additional habitat for these species. As discussed above, prey base for herons, which includes invertebrates and fish (Davis Jr & Kushlan, 2020;McCrimmon Jr et al, 2020;Vennesland & Butler, 2020;Watts, 2020), was equal to or greater at living shorelines compared to natural marshes. Therefore, living shorelines provide herons with additional habitat for foraging.…”

Section: Discussionmentioning

confidence: 88%

Living shorelines achieve functional equivalence to natural fringe marshes across multiple ecological metrics

Isdell

Bilkovic

Guthrie

et al. 2021

PeerJ

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Nature-based shoreline protection provides a welcome class of adaptations to promote ecological resilience in the face of climate change. Along coastlines, living shorelines are among the preferred adaptation strategies to both reduce erosion and provide ecological functions. As an alternative to shoreline armoring, living shorelines are viewed favorably among coastal managers and some private property owners, but they have yet to undergo a thorough examination of how their levels of ecosystem functions compare to their closest natural counterpart: fringing marshes. Here, we provide a synthesis of results from a multi-year, large-spatial-scale study in which we compared numerous ecological metrics (including habitat provision for fish, invertebrates, diamondback terrapin, and birds, nutrient and carbon storage, and plant productivity) measured in thirteen pairs of living shorelines and natural fringing marshes throughout coastal Virginia, USA. Living shorelines were composed of marshes created by bank grading, placement of sand fill for proper elevations, and planting of S. alterniflora and S. patens, as well as placement of a stone sill seaward and parallel to the marsh to serve as a wave break. Overall, we found that living shorelines were functionally equivalent to natural marshes in nearly all measured aspects, except for a lag in soil composition due to construction of living shoreline marshes with clean, low-organic sands. These data support the prioritization of living shorelines as a coastal adaptation strategy.

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Section: Discussionmentioning

confidence: 88%

Living shorelines achieve functional equivalence to natural fringe marshes across multiple ecological metrics

Isdell

Bilkovic

Guthrie

et al. 2021

PeerJ

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“…Estos son utilizados por ambas especies para anidar y forrajear, ya que generalmente son fuentes importantes de frutas e insectos (Arcos-Torres, 2005;Arcos et al, 2008;Gómez et al, 2016). En el caso de la garza real, es importante aclarar que esta especie es dependiente de ambientes ribereños o acuáticos, debido a que se alimenta de una amplia variedad de macroinvertebrados y vertebrados asociados a cuerpos de agua, lo cual favorece la presencia y abundancia de esta especie en ambientes ribereños (Arendt et al, 2012;McCrimmon et al, 2020). En cambio, las aves reportadas como raras corresponden a especies de hábitos específicos y que por lo general suelen ser afectadas por la fragmentación y transformación de hábitats, como es el caso de Myiarchus stolidus (Latta et al, 2006;Arcos-Torres et al, 2008;Joseph, 2020), (Tabla I).…”

Section: Resultados Y Discusiónunclassified

Estructura y composición de un ensamblaje de aves asociadas al río Maimón, República Dominicana

Almonte‐Espinosa¹

2022

Novit. Caribaea

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Se analizó la composición y estructura de un ensamblaje de aves asociadas a cuatro localidades ubicadas en los márgenes del río Maimón: confluencia del río Maimón con río Yuna, carretera Maimón Piedra Blanca, Piedra Blanca y Los Plátanos. Se registró un total de 598 individuos pertenecientes a 51 especies y 28 familias de aves. La localidad de Maimón Piedra Blanca registró los valores más altos de diversidad usando el índice de Shannon (H ́= 3.36), igualmente fue la estación con mayor abundancia y riqueza: 217 individuos y 43 especies respectivamente. Por el contrario, la estación ubicada en Los Plátanos presentó la menor diversidad de acuerdo con el índice de Shannon (H ́= 2.92). Además, esta estación mostró la menor riqueza: 29 especies. Se registraron siete gremios y 15 categorías tróficas. Los carnívoros y omnívoros fueron los grupos más diversos y abundantes. Se registraron diferencias significativas en la abundancia relativa de aves por gremios tróficos y por área de estudio (X² = 43.32, df = 18, p = ≤ 0.01). No se encontró diferencia en la riqueza de especies por gremio trófico (X² = 6.67, df = 18, p = 0.99). El número de categorías tróficas fue similar en las zonas evaluadas (X² = 39.34, d f= 42, p = 0.58). Se concluye que el ensamblaje de aves asociado al río Maimón se distribuye de forma equitativa. Además, tanto su composición como estructura están compuestas principalmente, por especies generalistas de hábitats y de amplia distribución. Finalmente, a pesar de que las áreas de estudio están muy fragmentadas, constituye un importante refugio para aves residentes y migratorias.

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“…The observed polymorphs, as well as two Great White Egret subspecies, A. a. modesta and A. a. alba, did not differ in BL/THL ratio values, indicating that this feature is constant within the Great White Egret. Given this and the fact that some polymorphs match courtship coloration pa erns described for A. a. modesta [19,21,29], a subspecies which has already been observed in Europe [21,26,29,30], thus, it cannot be excluded that these polymorphs may actually represent A. a. modesta long-distance vagrants in terms of breeding plumage. Vagrants from the east observed in Europe may have responded to climate warming in Europe [27].…”

Section: Discussionmentioning

confidence: 99%

“…During the non-breeding period, the bare parts of the subspecies A. a. modesta are characterized by a yellow bill, pale green/yellow loral region, and all-over black legs and breeding adults are characterized by a greyish/black bill (sometimes the beak is bicolored (black and yellow)), bright green-blue lores, bicolored legs (lighter tibia, e.g., pink, red and darker tarsus), or brightly colored legs [19,20] (see Supplementary Materials S1 and S2). Some authors classify Great White Egrets with brightly colored legs as the Eastern Great Egret subspecies A. a. modesta [19,20,29]. In A. a. alba, bright coloration of the whole legs is uncommon since only the tibiotarsus undergoes gradual and ephemeral coloration changes [20,30].…”

Section: Color Schemes Of Great White Egrets Described In the Literaturementioning

confidence: 99%

Color Polymorphism of Unfeathered Parts of the Great White Egret Ardea alba alba in Europe: An Analysis of the Internet Images

Cieślińska,

Manikowska-Ślepowrońska,

Jakubas

2023

Diversity

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Polymorphism has been described in many avian taxa including Ardeidae. This study investigated the spatio-temporal distribution of color polymorphic forms (with regard to the color of the unfeathered parts (legs/lores)) of the Great White Egret Ardea alba alba in internet images from Europe. In total, 140 images of presumed polymorphs from 16 countries (from 2006 to 2021) have been collected and examined. Eight coloration schemes of visible unfeathered parts were distinguished. Since some polymorphs may represent the subspecies Eastern Great Egret Ardea alba modesta, the ratio of beak length to total head length was compared among individuals representing the nominal and Eastern Great Egret subspecies. The ratio distributions were similar in all compared groups; thus, polymorph egrets may represent both of these subspecies. Most polymorph images originate from the Netherlands and the southwestern Norwegian coast. This may have resulted from specific local diets and contact with hormone-disrupting compounds. Nevertheless, some observation biases, such as the presence of local breeding population or high numbers of nature photographers, could have affected our observation pattern. Some analyzed features also followed temporal patterns. Most polymorphs were observed during the breeding season, suggesting disruptions of sex hormones as a possible cause. Studies of spatio-temporal patterns of polymorph occurrence may allow us to obtain insights into the causes of large variation in coloration schemes in polymorphic species.

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Great Egret (Ardea alba)

Cited by 8 publications

References 0 publications

Living shorelines achieve functional equivalence to natural fringe marshes across multiple ecological metrics

Living shorelines achieve functional equivalence to natural fringe marshes across multiple ecological metrics

Estructura y composición de un ensamblaje de aves asociadas al río Maimón, República Dominicana

Color Polymorphism of Unfeathered Parts of the Great White Egret Ardea alba alba in Europe: An Analysis of the Internet Images

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