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Wiley MS-474.Fm ORNITOLOGIA NEOTROPICAL 17: 105–146, 2006 © The Neotropical Ornithological Society THE ECOLOGY, BEHAVIOR, AND CONSERVATION OF A WEST INDIAN CORVID, THE WHITE-NECKED CROW (CORVUS LEUCOGNAPHALUS) James W. Wiley U. S. Geological Survey, Reston, Virginia, USA. Email: [email protected] Resumen. – Ecología y conservación del Cao (Corvus leucognaphalus). – El Cao anteriormente habi- taba en St. Croix, Puerto Rico y Hispaniola. Ahora sobrevive sólo en Hispaniola, donde las poblaciones declinan por algunas de las mismas razones responsables de su extirpación en Puerto Rico: fragmentación y pérdida del hábitat, y tiroteo. La depredación de los huevos y pichones por el Zorzal Pardo (Margarops fus- catus) también fue una razón importante en la extirpación del Cao en Puerto Rico. Estudié el Cao en la República Dominicana intermitentemente entre 1974 y 2004. La especie ocupa una gama amplia de hábi- tat, incluyendo costas húmedas y bosque montano, bosque de pino, bosque de cactus, manglar pantanoso y sabana de palmeras. Su conducta vocal es compleja y diversa, al igual que la de otros cuervos. El Cao se alimenta de una amplia variedad de plantas y presas animales. Durante los periodos de alimentación, los Caos seleccionaron plantas en 76,4% de las observaciones, mientras que del total de presas ofrecidas a los pichones 51,6% fueron animales. Las áreas centrales de actividad de tres parejas reproductoras promedia- ron 9,8 + 3,7 ha, considerando que el tamaño de su territorio promedio era de 5,5 + 5,2 ha. La construc- ción de los nidos comenzó a finales de Enero. Los nidos fueron estructuras voluminosas construidas en lo alto de los árboles. El período de incubación fue de aproximadamente 18–22 días y el período de anida- ción de 35–44 días. El tamaño de la nidada fue de cuatro huevos en seis nidos y tres huevos en un nido que inspeccioné hasta el término de la anidación. De 27 huevos en esos siete nidos, 25 pichones eclosionaron y 22 volaron de los mismos. La atención al nido fue más alta durante la incubación, y fue disminuyendo durante el período de anidación de los pichones. No se observó ningún tipo de depredación y sólo hubo una incidencia de ectoparasitismo en pichones. Se recomienda un programa de reintroducción del Cao a Puerto Rico como viable e importante para la supervivencia de la especie. Abstract. – The White-necked Crow (Corvus leucognaphalus) formerly inhabited St. Croix, Puerto Rico, and Hispaniola. It survives only in Hispaniola, where populations are declining for some of the same reasons primarily responsible for its extirpation from Puerto Rico: habitat fragmentation and loss, and shooting. Egg and chick depredation by the Pearly-eyed Thrasher (Margarops fuscatus) was also important in the extir- pation of the Puerto Rico population. I studied the crow in the Dominican Republic intermittently from 1974 to 2004. The species occupies a wide range of habitats, including wet coastal and montane forest, pine forest, cactus forest, mangrove swamp, and palm savanna. Its vocal behavior is complex and diverse, more like that of ravens than of crows. White-necked Crows fed on a wide variety of plant and animal mat- ter. Foraging crows selected plant materials in 76.4% of my observations, whereas animals made up 51.6% of the food items delivered to nestlings. Core activity areas of three breeding pairs averaged 9.8 + 3.7 ha, whereas their average territory size was 5.5 + 5.2 ha. Nest building began in late January. Nests were bulky structures placed high in trees. Eggs were incubated 18–22 days and the nestling period was 35–44 days. ______________ 1Mailing address: Maryland Cooperative Fish and Wildlife Research Unit, 1120 Trigg Hall, University of Maryland Eastern Shore, Princess Anne, Maryland 21853, USA. E-mail: [email protected] 105 WILEY Clutch size was four eggs at six nests and three eggs at one nest I inspected at clutch completion. Twenty- five chicks hatched from 27 eggs at those nests, and a total of 22 fledged. Adult nest attendance was high- est during incubation, then declined through the nestling period. I observed no predation and only a mod- erate incidence of ectoparasitism of chicks. A program of reintroducing the White-necked Crow to Puerto Rico is recommended as feasible and important to the survival of the species. Accepted 8 December 2005. Key words: Behavior, breeding, conservation, corvid, Corvus leucognaphalus, Dominican Republic, ecology, extinction, extirpation, Haiti, Hispaniola, Puerto Rico, vocalization, White-necked Crow. INTRODUCTION STUDY AREAS The four species of West Indian corvids, all I conducted fieldwork in the Dominican in the genus Corvus, with their raucous Republic in October 1974, December 1975 to calls and flocking behavior, are prominent July 1976, July and August 1978, July to Sep- members of avian communities in the tember 1982, August 1989, March to April Antilles. Resident and visiting naturalists 1996, May to June 2000, June and December have accumulated considerable anecdotal 2001, January, March to May, and August information through incidental observations 2002, and December 2004. I watched crows of these birds, yet the basic natural history in several locations, but my major study area of West Indian corvids is poorly known was in Los Haitises, north-central Dominican (Johnston 1961, Cruz 1972, Goodwin Republic, and Pedernales, southwestern 1976). With the rampant habitat alteration Dominican Republic (Fig. 3). The Haitises occurring throughout most of the West region is rugged limestone karst (“mogotes”) Indies, several corvid populations have of Miocene origin, with narrow valleys having declined or disappeared (Barbour 1943, deep soils, and extensive natural hardwood Greenway 1958, Bond 1973, Goodwin 1976). forests (Zanoni et al. 1990). Elevations at Los The White-necked Crow (Corvus leuco- Haitises ranged from 250 to 360 m. The area gnaphalus; Fig. 1) formerly occurred in is west of the village of Pilancón, and approx- Hispaniola, Puerto Rico, and St. Croix imately 20 km northeast of Bayaguana (Fig. 2), but today survives only in Hispaniola, (i.e., study area centered at 18°55’76”N, including Île de la Gonäve and Isla 069°36’11”W). The nearest weather stations Saona. Because of its decreasing range and to the Haitises study area, Bayaguana and extirpation from entire landmasses, a main Sabana de la Mar (35 km northeast), reported objective of my study was to determine mean annual rainfalls of 181 cm and 212 cm, why the crow disappeared from parts and mean annual temperatures of 24.5°C and of its former range. Resolution of the 25.2°C, respectively. The rainfall and tempera- question of the crow’s decline required a tures in my Los Haitises study area probably basic knowledge of its life history and behav- fall between those given for the two stations. ioral ecology. Thus, my objectives included Maximum rainfall occurs from May to Octo- determining the crow’s general ecology and ber. The karst is quite permeable, and stand- behavior. Finally, my objectives included ing water is rare. providing managers with information to The plant community in Los Haitises is allow them to make biologically sound deci- classified as a subtropical wet forest (Hold- sions for the conservation of the White- ridge Classification; OAS Ecological Map, necked Crow. Washington, DC, 1967). Characteristic trees 106 WHITE-NECKED CROW ECOLOGY AND CONSERVATION FIG. 1. Adult White-necked Crow at nest with late-stage chicks, Los Haitises, Dominican Republic. include cupey (Clusia rosea), fourleaf buchena- pentandra), masa (Tetragastris balsamifera), Amer- via (Buchenavia capitata), West Indian mahog- ican muskwood (Guarea guidonia), Spanish any (Swietenia mahagoni), kapoktree ( (Ceiba cedar (Cedrela odorata), bullwood (Sloanea FIG. 2. Recent and present distribution of the genus Corvus in the West Indies (After Olson & Hilgartner 1982). † = extirpated or extinct population. 107 WILEY FIG. 3. Hispaniola (Haiti and Dominican Republic), showing study areas and other sites mentioned in text. berteriana), and corcho bobo (Pisonia albida); life zone. The plant community of the area is plant names follow Little & Wadsworth highly disturbed and represents a secondary 1964), Little et al. (1974), Zanoni et al. 1990, replacement of more diverse past communi- and USDA, NRCS (2004). The study area ties. Porknut (Acacia macracantha) comprises consisted of virgin forest, as well as active and about 50% of the cover, with Hispaniolan abandoned small farms. Although the region royal palm (Roystonea hispaniolana), coconut was declared a national park (Parque Nacional palm (Cocos nucifera), and mango (Mangifera Los Haitises) in 1976, clear-cutting and burn- indica) also abundant. Other important trees ing for farming accelerated through 2004. and shrubs included Capparis ferruginea, Jamai- Subsistence crops are mixtures of several can caper (C. cynophallophora), tuna (Opuntia fruits and vegetables. Abandoned farms are moniliformis), lignum-vitae (Guajacum officinale), quickly invaded by higuillo de hoja menuda baitoa (Phyllostylon brasiliense), Gouane palm (Piper aduncum), matchwood (Didymopanax (Coccothrinax ekmanii), and chechen (Metopium morototoni), monkey’s hand (Lepianthes peltata), brownei) (Fisher-Meerow 1983, Fisher-Meerow and sword fern (Nephrolepsis multiflora). Fur- & Judd 1989). Annual rainfall at Pedernales ther descriptive information on the study area averages 47.1 cm, with two main rainfall peri- is presented by Wiley & Wiley (1981), Snyder ods, May and June, and September and Octo- et al. (1987), and Zanoni et al. (1990). ber. Annual temperature averages 27.9°C. The Pedernales study area included the I examined crow nests in the wet coastal plain and low foothills east of the degraded forest in the coastal foothills south town of Pedernales. The area is eroded lime- of Barahona (mean annual temperature stone within the subtropical thorn woodland 26.7°C; mean annual rainfall 101.9 cm; wet- 108 WHITE-NECKED CROW ECOLOGY AND CONSERVATION test months May and June, and September routes) study areas from 1974 to 2004. Three and October).
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