Ridgway's Hawk (Buteo ridgwayi)

Anderson, David L.; Thorstrom, Russell; Hayes, Christine D.; Hayes, Thomas I.; Curti, Marta; Boesman, Peter F. D.

doi:10.2173/bow.ridhaw1.02

Cited by 3 publications

(6 citation statements)

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“…This species was formerly documented inhabiting most vegetation classes throughout its range from sea level to 2,000 m above sea level (asl), including diverse forest types (tropical and subtropical forest, pine forest, limestone karst forest, secondary forest, wooded landscapes) and open associations (open country, lowland scrub, and human-modified landscapes such as pastoral and agricultural areas) (Wiley and Wiley 1981, Keith et al 2003, Thorstrom et al 2007, Woolaver 2011. A burgeoning Ridgway's Hawk population in Punta Cana, Dominican Republic, which was founded through an assisted dispersal program carried out by The Peregrine Fund, has demonstrated this hawk is also adaptable to living in more suburban areas, including developed neighborhoods and golf courses (McClure et al 2017, Anderson et al 2021.…”

Section: Mots Clésmentioning

confidence: 99%

“…is another contributing factor in the species' near extinction (Hayes et al 2019). Treatment to prevent parasitism of nestlings as well as an intensive education campaign have reversed the decline of the Ridgway's Hawk population in Los Haitises National Park, while successful reintroduction campaigns in Punta Cana and Aniana Vargas National Park have led to two other small populations within the Dominican Republic (Anderson et al 2021).…”

Section: Mots Clésmentioning

confidence: 99%

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Rediscovery of the Critically Endangered Ridgway’s Hawk (<em>Buteo ridgwayi</em>) in Haiti

Jean¹,

Fildor²,

Curti³

et al. 2023

JCO

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Abstract The Ridgway’s Hawk (Buteo ridgwayi) is a Critically Endangered, diurnal bird of prey endemic to the Caribbean island of Hispaniola and some satellite islands. This hawk was once distributed in lowland habitats across the island, which includes the countries of Haiti and the Dominican Republic. However, its population has declined over the past century and it was believed to have been extirpated from Haiti nearly 60 yr ago. Here we report the first documented sighting of Ridgway’s Hawk on Les Cayemites, Haiti in over 100 yr and the first sighting in Haiti since 1962. This short note describes our initial rediscovery of the hawk in 2019 and our subsequent field surveys in 2020 and 2021. Given the importance of Les Cayemites to the Ridgway’s Hawk population in Haiti in the past and the results of our recent surveys, we propose that this region be considered an Important Bird Area under Criterion A1. We also recommend that any conservation program for Ridgway’s Hawk in Haiti include community development with the goal to decrease human pressure on native wildlife. Keywords Buteo ridgwayi, conservation, endemic, extinct species, extirpated, Hispaniola, islands, raptor Resumen Redescubrimiento de Buteo ridgwayi, en peligro crítico de extinción en Haití • Buteo ridgwayi es una rapaz diurna en peligro crítico de extinción, endémica de la isla caribeña de La Española y algunas islas satélite. Antaño, este gavilán estuvo distribuido en hábitats de tierras bajas por toda la isla, que incluye los países de Haití y República Dominicana; sin embargo, su población ha disminuido durante el pasado siglo y se creía que había sido extirpado de Haití hace casi 60 años. Aquí informamos el primer avistamiento documentado de esta especie en Les Cayemites, Haití, en más de 100 años, y el primer avistamiento en Haití desde 1962. Esta nota corta describe nuestro redescubrimiento inicial del gavilán en 2019 y nuestros muestreos de campo posteriores en 2020 y 2021. Dada la importancia de Les Cayemites para la población B. ridgwayi en Haití en el pasado, y los resultados de nuestros recientes muestreos, proponemos que esta región se considere un Área Importante para las Conservación de las Aves según el Criterio A1. También recomendamos que cualquier programa de conservación para esta rapaz en Haití incluya el desarrollo comunitario con el objetivo de reducir la presión humana sobre la vida silvestre nativa. Palabras clave Buteo ridgwayi, conservación, endémica, especie extinta, extirpada, islas, La Española, rapaz Résume Redécouverte de la Buse de Ridgway (Buteo ridgwayi), espèce en danger critique d’extinction, en Haïti • La Buse de Ridgway (Buteo ridgwayi) est un rapace diurne en danger critique d’extinction, endémique à l’île caribéenne d’Hispaniola et à certaines îles satellites. Cette buse était autrefois présente dans les habitats de plaine de toute l’île, qui comprend Haïti et la République dominicaine; toutefois, sa population a diminué au cours du siècle dernier et elle semble avoir disparu d’Haïti il y a près de 60 ans. Nous rapportons ici la première observation documentée de la Buse de Ridgway sur les Cayemites, en Haïti, depuis plus de 100 ans, et en Haïti depuis 1962. Cette note décrit notre redécouverte initiale de ce rapace en 2019 et nos prospections de terrain ultérieures en 2020 et 2021. Étant donné l’importance des Cayemites pour la population de Buse de Ridgway en Haïti dans le passé et les résultats de nos récentes prospections, nous proposons que cette région soit considérée comme une Zone Importante pour la Conservation des Oiseaux selon le critère A1. Nous recommandons également que tout programme de conservation de cette Buse en Haïti porte notamment sur le développement communautaire dans le but de réduire la pression humaine sur la faune indigène. Mots clés Buteo ridgwayi, conservation, endémique, espèce éteinte, extinction, Hispaniola, îles, rapace

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Section: Mots Clésmentioning

confidence: 99%

Section: Mots Clésmentioning

confidence: 99%

Rediscovery of the Critically Endangered Ridgway’s Hawk (<em>Buteo ridgwayi</em>) in Haiti

Jean¹,

Fildor²,

Curti³

et al. 2023

JCO

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“…This call was longer than all other call types identified. We did not obtain a recording of this call type, but it was identified based on the sonogram and call descriptions by Wiley and Wiley (1981) and Anderson et al (2021). Of 11 total observations of this type of vocalization (Table 2), 1 was given by a male hawk, 2 by female hawks, and 8 by hawks of unknown sex.…”

Section: Vocalization Descriptions and Sonogramsmentioning

confidence: 99%

“…Formerly extirpated from much of the island due to habitat loss, illegal hunting, and parasitic fly larvae (Philornis spp. ; Hayes 2019) the Ridgway's Hawk population has been increasing in recent years, due in large part to conservation efforts led by The Peregrine Fund (Anderson et al 2021). Prior to translocation, the only known extant population of Ridgway's Hawks in the Dominican Republic was in Los Haitises National Park, located on the country's northeast coast.…”

mentioning

confidence: 99%

“…Prior to translocation, the only known extant population of Ridgway's Hawks in the Dominican Republic was in Los Haitises National Park, located on the country's northeast coast. A successful translocation of individuals from the Los Haitises population has established a new, stable population with c. 26 breeding pairs (as of 2022) on the private property of Puntacana Resort and Club in Punta Cana, Dominican Republic, > 100 km from Los Haitises (McClure et al 2017, Anderson et al 2021. As of 2022, 121 young have fledged from wild nests in the translocated Punta Cana population, with the last formal releases of translocated hawks taking place in 2017 (TIH unpubl.…”

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confidence: 99%

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Pre-breeding behavior of Ridgway’s Hawks (Buteo ridgwayi) in Punta Cana, Dominican Republic

Samantha J. Hagler,

Kara Abbott,

Christine D. Hayes

et al. 2023

JCO

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Recent conservation work by The Peregrine Fund has established a translocated population of the Critically Endangered Ridgway’s Hawk (Buteo ridgwayi) in Punta Cana, Dominican Republic. Although Ridgway’s Hawk has been the focus of extensive conservation work, relatively little has been published about this species’ pre-breeding behavior. In this study, we collected behavioral observations and vocalization recordings of three established pairs of Ridgway’s Hawks in Punta Cana in January 2018, in order to better characterize this species’ pre-breeding behavior. Consistent with prior studies of Ridgway’s Hawks in Los Haitises National Park, Dominican Republic, our behavioral observations of hawks in Punta Cana suggest social and sexual monogamy in this species. Notably, our observations suggest a higher frequency of copulations between members of a pair in Punta Cana than was previously observed in the Los Haitises population. These observations provide additional context for understanding this species’ pre-breeding behavior and sexual behavior, particularly in this small but growing translocated population. Keywords behavior, Buteo ridgwayi, Dominican Republic, Ridgway’s Hawk, vocalizations Resumen Comportamiento pre-reproductivo del Gavilán de La Española (Buteo ridgwayi) en Punta Cana, República Dominicana • Los recientes trabajos de conservación de The Peregrine Fund han establecido una población translocada del Gavilán de La Española (Buteo ridgwayi), especie en peligro crítico de extinción, en Punta Cana, República Dominicana. Aunque este gavilán ha sido objeto de un extenso trabajo de conservación, se ha publicado relativamente poco sobre el comportamiento pre-reproductivo de esta especie. En este estudio, recolectamos observaciones conductuales y grabaciones de vocalización de tres parejas establecidas de Gavilán de La Española en Punta Cana en enero de 2018, con el fin de caracterizar mejor el comportamiento pre-reproductivo de esta especie. Nuestras observaciones de comportamiento de esta especie en Punta Cana sugieren monogamia social y sexual en ella, en consonancia con estudios previos de individuos de Gavilán de La Española en el Parque Nacional Los Haitises, República Dominicana. En particular, nuestras observaciones sugieren una mayor frecuencia de cópulas entre miembros de una pareja en Punta Cana que la observada previamente en la población de Los Haitises. Estas observaciones proporcionan un contexto adicional para comprender el comportamiento pre-reproductivo y sexual de esta especie, particularmente en esta pequeña pero creciente población translocada. Palabras clave Buteo ridgwayi, comportamiento, Gavilán de La Española, República Dominicana, vocalizaciones Résumé Comportement prénuptial de la buse de Ridgway (Buteo ridgwayi) à Punta Cana, République dominicaine • Le Peregrine Fund a récemment établi une population de Buse de Ridgway (Buteo ridgwayi) – une espèce en danger critique d’extinction – à Punta Cana, en République dominicaine. Bien que la Buse de Ridgway ait fait l’objet d’un important travail de conservation, relativement peu de choses ont été publiées sur le comportement prénuptial de cette espèce. Dans cette étude, nous avons recueilli des observations comportementales et des enregistrements de vocalisations de trois couples établis à Punta Cana en janvier 2018, afin de mieux caractériser le comportement prénuptial de l’espèce. Conformément à des études antérieures sur les Buses de Ridgway dans le Parc national de Los Haitises, en République dominicaine, nos observations du comportement de ce rapace à Punta Cana indiquent une monogamie sociale et sexuelle chez cette espèce. Il ressort notamment de nos observations que la fréquence des copulations entre les membres d’un couple est plus élevée à Punta Cana que celle observée précédemment dans la population de Los Haitises. Ces observations fournissent des informations supplémentaires pour comprendre le comportement préreproducteur et le comportement sexuel de l’espèce, en particulier dans cette population transférée, encore réduite mais croissante. Mots clés Buse de Ridgway, Buteo ridgwayi, comportement, République dominicaine, vocalisations

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Bill shape reflects divergent prey consumption for island compared to mainland American kestrels (Falco sparverius)

Jones,

Berns,

Belk

et al. 2024

Biological Journal of the Linnean Society

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Feeding morphology permits animals to adapt to changing environments and is often under strong selection. We evaluated if bill shape varies according to differences in dietary prey taken across geographical ranges (North America, Central America, South America, and Caribbean islands) in a ubiquitous, New World raptor species, the American kestrel (Falco sparverius). Specifically, we predicted that bills in geographies where kestrels consumed a larger proportion of vertebrates would be shorter and wider, with a larger tomial tooth. We reviewed the literature on kestrel diets across their range and quantified potential differences in bill shape using geometric morphometric methods for 245 museum specimens. The literature review revealed that most prey consumed by kestrels in North, South, and Central America were invertebrates (51.6–69.1%), whereas Caribbean kestrels consumed mostly vertebrates (61.4%), most of which were reptiles (77.3%). Morphometric analyses agreed with these findings; bill shape differed for island versus mainland kestrels but not among mainland regions. Bill shape on islands reflected a more robust bill with a larger tomial tooth, but had a longer hook, which we suggest is adaptive for consumption of lizard prey, more available on islands due to reduced competition with other raptors compared to mainland regions.

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Ridgway's Hawk (Buteo ridgwayi)

Cited by 3 publications

References 0 publications

Rediscovery of the Critically Endangered Ridgway’s Hawk (<em>Buteo ridgwayi</em>) in Haiti

Rediscovery of the Critically Endangered Ridgway’s Hawk (<em>Buteo ridgwayi</em>) in Haiti

Pre-breeding behavior of Ridgway’s Hawks (Buteo ridgwayi) in Punta Cana, Dominican Republic

Bill shape reflects divergent prey consumption for island compared to mainland American kestrels (Falco sparverius)

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