3 results on '"McCoy, Michael"'
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2. Utilización de hábitat, comportamiento y dieta del mono congo (Alouatta palliata) en un bosque premontano húmedo, Costa Rica
- Author
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Sánchez Porras, Ronald Eduardo and McCoy, Michael
- Subjects
BOSQUES TROPICALES ,NUTRICION ANIMAL ,ALOUATTA PALLIATA ,ECOLOGIA ANIMAL ,BOSQUE TROPICAL HUMEDO ,ANIMAL ECOLOGY ,TROPICAL FORESTS ,COSTA RICA ,TROPICAL RAINFOREST ,DIETA ,MONO CONGO ,ANIMAL NUTRITION ,DIET - Abstract
ICOMVIS Determinó el número de individuos, la composición social, y la variación estacional del a) ámbito de acción mensual (AAM)y total (AAT), b) hábitos alimenticios, c) comportamiento y ch) distribución altitudinal de los monos congo (Alouatta palliata) de setiembre 1989 a marzo 1990 en dos parches de bosque premontano húmedo: a) alterado de 5 ha, sector Río Jesús y b) no alterado de 1000 ha, sector Mina Moncada en San Ramón, Alajuela, Costa Rica. Las estaciones seca y lluviosa ocurren en noviembre-abril y mayo-octubre, respectivamente. Las tropas fueron observadas durante 1536 h para una media de 12 h diarias en 132 días, con un total de 3067 localizaciones. Se estimó la distribución altitudinal por medio de las localizaciones diarias. Se observó el comportamiento fenológico de 15 especies de árboles que los congos consumieron para determinar la relación entre consumo y disponibilidad. Se encontró una tropa en Río Jesús de 11 individuos y cuatro tropas en Mina Moncada con un total de 49 individuos. El AAM en Río Jesús vario de 1,13 a 3,34 ha, con un AAT de 6,25 ha. En Mina Moncada el AAM vario de 0,003 a 1,95 ha con el AAT de 2,67 ha. El AAM no vario significativamente entre meses en Río Jesús (P=0,47). En Mina Moncada el AAM fue mayor en los meses febrero-marzo con respecto a setiembre-noviembre (P=0,05). El AAM fue mayor en Río Jesús que en Mina Moncada (P=0,01). Los congos utilizaron significativamente un mayor número de especies y de más diversidad (P=0,07) en Río Jesús que en Mina Moncada (P=0,003). En Río Jesús los congos utilizaron un 63% del tiempo en consumir Ficus pertusa, F. obtusifolia, Inga vera y F. yaponensis, y en Mina Moncada emplearon un 73% del tiempo en consumir F. obtusifolia, F. trachelosyce y F. jimenezii. Tanto en Río Jesús como Mina Moncada, tuvo mayor consumo de hojas tiernas que las demás categorías de alimentación (P=0,001). Existió diferencias fenológicas entre las 15 especies de árboles estudiadas. El uso de alimento no fue asociado con su disponibilidad en la mayoría de los casos. Para F. jimenezii existió más uso con más disponibilidad pero no fue significativo (r=0,58; P=0,13), mientras que con F. pertusa se dio más uso con menos disponibilidad, pero tampoco fue significativo (r=0,51; P=0,18). Se registraron solo seis pautas de comportamiento de las diez establecidas. El descanso fue la pauta en la que los congos gastaron mayores porcentajes de tiempo en los dos sectores. La distribución altitudinal de la tropa en Mina Moncada varió de 650 a 850 m.s.n.m. Se propone los límites para proteger el sector de Mina Moncada, así como también se propone pautas para el manejo de la especie y su hábitat. It determined the number of individuals, the social composition, and the seasonal variation of the a) monthly scope of action (AAM) and total (AAT), b) feeding habits, c) behavior and ch) altitudinal distribution of the howler monkeys (Alouatta palliata ) from September 1989 to March 1990 in two patches of humid premontane forest: a) altered 5 ha, Río Jesús sector and b) unaltered 1000 ha, Mina Moncada sector in San Ramón, Alajuela, Costa Rica. The dry and rainy seasons occur in November-April and May-October, respectively. The troops were observed for 1536 hours for an average of 12 hours per day in 132 days, with a total of 3067 locations. The altitudinal distribution was estimated through the daily locations. The phenological behavior of 15 tree species that the Congolese consumed was observed to determine the relationship between consumption and availability. A troop was found in Río Jesús of 11 individuals and four troops in Mina Moncada with a total of 49 individuals. The AAM in Río Jesús varied from 1.13 to 3.34 ha, with an AAT of 6.25 ha. In Mina Moncada, the AAM varied from 0.003 to 1.95 ha with the AAT of 2.67 ha. The AAM did not vary significantly between months in Río Jesús (P = 0.47). In Mina Moncada, the AAM was higher in February-March compared to September-November (P = 0.05). The AAM was higher in Río Jesús than in Mina Moncada (P = 0.01). The Congolese used significantly a higher number of species and more diversity (P = 0.07) in Río Jesús than in Mina Moncada (P = 0.003). In Río Jesús, the Congolese spent 63% of the time consuming Ficus pertusa, F. obtusifolia, Inga vera and F. yaponensis, and in Mina Moncada they spent 73% of the time consuming F. obtusifolia, F. trachelosyce and F. jimenezii . Both in Río Jesús and Mina Moncada, it had a higher consumption of young leaves than the other food categories (P = 0.001). There were phenological differences between the 15 species of trees studied. The use of food was not associated with its availability in most cases. For F. jimenezii there was more use with more availability but it was not significant (r = 0.58; P = 0.13), while with F. pertusa there was more use with less availability, but it was not significant either (r = 0 , 51; P = 0.18). Only six behavioral patterns of the ten established were recorded. Rest was the pattern in which the Congolese spent the highest percentages of time in the two sectors. The altitude distribution of the troop in Mina Moncada ranged from 650 to 850 m.a.s.l. Limits are proposed to protect the Moncada Mine sector, as well as guidelines for the management of the species and its habitat. Universidad Nacional, Costa Rica Instituto Internacional en Conservación y Manejo de Vida Silvestre
- Published
- 1991
3. [Impact of artificial light on nesting in the leatherback turtle Dermochelys coriacea (Testudines: Dermochelyidae) at Cipara beach, Venezuela].
- Author
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Rondón Médicci M, Buitrago J, and Mccoy M
- Subjects
- Animals, Female, Male, Venezuela, Lightning, Nesting Behavior physiology, Turtles physiology
- Abstract
The number of Leatherback turtle nests and their spatial distribution was compared between years with and without artificial light, and between dark and lighted beach segments, in Cipara Beach, Paria Peninsula, Venezuela. Residents were interviewed to identify their perceptions about the impact of artificial light on sea turtles. Mean volume of sand per meter of beach was larger at La Peña, Cipara and La Remate and smaller at Varadero (p<0.001), increasing from April to June and later decreasing until August (p<0.05). Mean percentage of gravel was higher at Varadero and La Peña, and lower at La Remate and Cipara. Most interviewed people said that artificial light does not affect sea turtles. Between 2000 and 2005, 1,217 leatherback landings and 1,056 nests were observed. Successful nests increased with the years (p=0.035) as well as total nest number (p=0.015). From 2000 through 2003 there were 743 landings, 661 nests and 374 clutches. During the two years with electric light (2004-2005), there were 474 landings, 395 nests and 232 clutches. Proportion of landings with nest building decreased significantly during the years with electric light (p=0.005), but nesting success did not vary (p=0.402). No significant difference was found between landings per beach meter in dark and lighted sectors (p=0.244), between nests built (p=0.379) and in the rate of successful nesting (p=0.516). Dark and lighted sectors did not differ in the proportion of landings with nest building (p=0.067) and success rate (p=0.833).
- Published
- 2009
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