Thermal and reproductive ecology of the snake Psammophis phillipsi from the rainforest region of southern Nigeria
Thermal and reproductive ecology of the snake Psammophis phillipsi from the rainforest region of southern Nigeria
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尼日利亚南部雨林地区的蛇 Psammophis phillipsi 的热生态和生殖生态学
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
Francesco M. Angelici And Luca Luiselli
中科院分区：
文献类型：
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作者：
G. Akani;E. Eniang;Itohowo J. Ekp;Francesco M. Angelici And Luca Luiselli
对产自尼日利亚东南部的游蛇菲律宾沙游蛇（Psammophisphillipsi）的热生态和生殖生态进行了研究。其年生殖周期具有很好的同步性和季节性：雌性在旱季的中期妊娠，产卵发生在旱季的下半期（2 - 3月），而卵孵化发生在雨季的开始（4月中旬至6月上旬）。平均产卵量为9.2 ± 0.9粒（n = 23），与母体大小有关。妊娠和非妊娠标本在平均SVL、平均T B或Ts方面无显著差异。平均T B从0600至1200小时有规律地增加的趋势，在中午（1200-1500小时）达到较高值，1800小时后有下降的趋势。妊娠个体的T B变异在清晨和中午显著低于非妊娠个体，而在其他时间显著高于非妊娠个体。多元回归分析表明，Ta和Ts的交互作用对T B有显著影响，而T B不受妊娠动物产卵数的影响。
Aspects ofthe thermal and reproductive ecology were studied in the colubrid snake Psammophis phillipsi from south-eastern Nigeria. The annual reproductive cycle was well synchronized and seasonal: females were gravid in the middle part of the dry season, and oviposition occurred in the second half ofthe dry season (February-March), whereas egg hatching occurred by the onset of the rainy season (mid April to early June). The mean number of eggs was 9.2′0.9 (n = 23), and was related to maternal size. Gravid and non-gravid specimens did not differ significantly in terms of mean SVL, mean T b , or T s . Mean T b tended to increase regularly from 0600 to 1200 hrs, attained the higher values in the middle of the day (1200-1500 hrs), and tended to decrease after 1800 hrs. Gravid individuals differed from non-gravid individuals in that their variances of T b were notably lower both in the early morning and in the middle of the day, but higher at other times of day. Multiple regressions showed that the interaction of T a and T s had a significant effect on T b , whereas T b was not influenced by the number of eggs produced in gravid animals.