Kofi Amponsah-Mensah, Michael A Hudson, Andrew A Cunningham, James L N Wood, Yaa Ntiamoa-Baidu
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引用次数: 0
摘要
我们提供了在加纳冈比亚肩章果蝠（Epomophorus gambianus）种群的生存和繁殖率的首次估计。我们在3年多的时间里集中研究了一个大约5000只蝙蝠的大群体，以估计该物种的种群参数，包括种群规模、出生率、存活率和性别比例。生殖年表证实为季节性双峰性，出生时间为每年的3月/ 4月和8月/ 9月。估计每个繁殖季节的出生率为0.89 （95% CI = 0.85至0.92）。研究人群的总体性别比（男女比例）以男性为主（0.69,95% CI = 0.64 ~ 0.75），但成年人偏女性（62%为女性，χ 21 = 42, P < 0.0001），并表现出时间和年龄特异性差异。通过对60只蝙蝠进行10个月的无线电跟踪，我们获得了该物种每月最低存活率的初步估计为0.81 (95% CI = 0.74至0.86)，但由于可能未检测到带标签的蝙蝠的迁移，这可能被低估了。
Demography of the Gambian Epauletted Fruit Bat (Epomophorus gambianus) in Ghana.
We provide the first estimates of survival and reproductive rates for a population of the Gambian Epauletted Fruit Bat Epomophorus gambianus in Ghana. We focused on a large colony of ca. 5,000 bats over 3 years to estimate population parameters including population size, birth rates, survival, and sex ratios for this species. Reproduction chronology was confirmed as seasonal bimodal polyestry, with births occurring in March/April and August/September each year. The estimated birth rate was 0.89 (95% CI = 0.85 to 0.92) per reproductive season. The overall sex ratio (female to male ratio) of the study population was male-dominated (0.69, 95% CI = 0.64 to 0.75), but female-biased for adults (62% female, χ21 = 42, P < 0.0001), and showed temporal and age-specific variations. By radiotracking 60 bats for 10 months, we obtained the first estimates of minimum monthly survival for this species as 0.81 (95% CI = 0.74 to 0.86), but this could be an underestimate due to possible undetected emigration of tagged bats.
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