3 years ago

Conservation status assessment of the Sharp-shinned Hawk, an endangered insular raptor in Puerto Rico

Francisco J. Vilella, Julio C. Gallardo
Sharp-shinned Hawks (Accipiter striatus) are forest raptors that are widely distributed in the Americas. A subspecies endemic to Puerto Rico (A. s. venator) is listed as endangered and restricted to mature and old secondary montane forests and shade coffee plantations. However, recent information about the population status and distribution of Puerto Rican Sharp-shinned Hawks is lacking. We developed a spatial geographic distribution model for Sharp-shinned Hawks in Puerto Rico from 33 locations collected during four breeding seasons (2013–2016) using biologically relevant landscape variables (aspect, canopy closure, elevation, rainfall, slope, and terrain roughness). Elevation accounted for 89.8% of the model fit and predicted that the greatest probability of occurrence of Sharp-shinned Hawks in Puerto Rico (> 60%) was at elevations above 900 m. Based on our model, an estimated 56.1 km2 of habitat exists in Puerto Rico with a high probability of occurrence. This total represents ~0.6% of the island's area. Public lands included 43.8% of habitat with high probability of occurrence (24.6 km2), 96% of which was located within four protected areas. Our results suggest that Sharp-shinned Hawks are rare in Puerto Rico and restricted to the higher elevations of the Cordillera Central. Additional research is needed to identify and address ecological limiting factors, and recovery actions are needed to avoid the extinction of this endemic island raptor. Evaluación del estado de conservación de una rapaz insular en peligro: el Gavilán estriado en Puerto Rico El Gavilán estriado es una rapaz ampliamente distribuida en las Américas la cual tiene tres subespecies endémicas al Caribe. La subespecie endémica a Puerto Rico está listada como en peligro que se restringe a bosque montano maduro y secundario y plantaciones de café bajo sombra. La información sobre el estado poblacional y distribución del Gavilán estriado de Puerto Rico es escasa. Desarrollamos un modelo espacial de distribución geográfica del Gavilán estriado en Puerto Rico con 33 localidades de observaciones colectadas durante las temporadas reproductivas del 2013 al 2016 y variables de paisaje biológicamente relevantes (aspecto, cobertura de dosel, elevación, lluvia, pendiente y rugosidad de terreno). La elevación representó el 89.8% del ajuste del modelo y predijo la mayor probabilidad de ocurrencia del Gavilán estriado en Puerto Rico (> 60%) se encuentra por arriba de los 900 m. El modelo estimó 56.1 km2 de hábitat existente en Puerto Rico con alta probabilidad de ocurrencia. Este total representa 0.6% del área de la isla. Las tierras públicas incluyeron 43.8% de hábitat con alta probabilidad de ocurrencia, del cual 96% está localizado en cuatro áreas protegidas. Nuestros resultados sugieren que el Gavilán estriado en Puerto Rico es raro y está restringido a las elevaciones más altas de la Cordillera Central. Se necesita una mayor investigación para abordar e identificar los factores ecológicos limitantes y acciones de recuperación son necesarias para evitar la extinción de esta rapaz insular endémica.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1111/jofo.12228

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.