Neotropical Primates Field Studies and Conservation : Proceedings of a Symposium on the Distribution and Abundance of Neotropical Primates (1976) / Chapter Skim
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Comparison of Census Data on Alouatta palliata from Costa Rica and Panama
Comparison of Census Data on Alouatta palliata from Costa Rica and Panama
Pages 10-19
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From page 10... ...
conducted 12 censuses of howler monkeys in the tropical dry forest of northwestern Costa Rica. The Costa Rican data are compared to the censuses of the same species of howler living on Barro Colorado Island (BCI)
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From page 11... ...
TABLE 1 Models for Stable or Increasing Populations Models for 4 years of active reproduction for females reaching maturity after 3 preadult years; 1 infant/year/female; 1:1 sex ratio among infants; no sex differential in preadult mortality, t indicates occurrence of a death. Part I -- 7-Year Model Number of females is constant; local population size constant; all preadult mortality assessed at birth.
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From page 12... ...
. Part II -- Maximum Rate of Growth Increasing number of adult females: local population growing or emigrating: no preadult mortality.
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From page 13... ...
STUDY SITES AND PROCEDURES The OTS class projects on the mantled howler monkey (Alouatta pallia ta) were conducted primarily on Finca Taboga, a research facility of the Costa Rican Department of Agriculture.
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From page 14... ...
Comparison of the 1972 BCI data with the Taboga census next most similar in average troop size (February 1967) gives a chi-square = 4.0 (P <.05; 1 d.f.)
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From page 15... ...
In February 1968, the first categories to decrease were the adult males, adult females, and juveniles. By July 1968, the adult females and juveniles showed a further decline from the 1967 figures.
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From page 16... ...
La Pacifica III showed an opposite change in the F:J + I ratio, but the value attained just equals 1:0.75. The ratio of adult males to adult females changed from 1:2.8 to 1:3 in La Pacifica III and from 1:2.5 to 1:6 in La Pacifica II.
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From page 17... ...
CONCLUSIONS The censuses of howler monkeys at two sites in the tropical dry forests of Costa Rica present a picture of a distressed and declining population. In some respects, the howlers of Taboga and La Pacffica are even more seriously depressed than the 1951 population on BCI, which had just been decimated by yellow fever.
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From page 18... ...
In a series of "normally bad" years, the population total and the average troop size may decrease steadily, and the signal ratios may indicate reproductive activity slightly above or below maintenance levels. It is easy to visualize a continually decreasing average troop size with F:J + I ratios considerably more favorable than those that we have designated as minimal replacement values.
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From page 19... ...
Roman Miguel, Veterinario, Centre Agricola Veterinario Regional de Liberia, Costa Rica, currently head of the rabies project, Zoonosis Department, Ministerio Salubridad Piiblica, Republica de Costa Rica. The fieldwork was supported by National Science Foundation grants to the educational program of the Organization for Tropical Studies.
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