摘要:
2004 年5 ~ 6 月, 在安徽扬子鳄国家级保护区红星保护点, 对发情期的扬子鳄(Alligator sinensis )进行了昼间行为时间分配和活动节律的研究。扬子鳄的行为谱包括游动、晒阳、停息、吼叫和交配等。就所观察到的几种主要行为统计发现, 从7 :00 到19 :00 , 扬子鳄昼间游动行为占有最大的百分率, 达到(34.30 26.27)%;其次是停息行为, 为(30.4418.50)%;再次为晒阳和吼叫行为, 分别为(21.04 32.95)%和(14.16 18.97)%。游动行为各时段占有的百分率比较接近, 为26.47 %~ 44.83 %, 但在游动过程中, 它们并不是始终保持一种姿势游泳。停息行为存在2 个高峰期, 分别为9 :00 ~ 11 :00 和17 :00 ~ 19 :00时间段;晒阳行为出现在6 月3 日以后, 仅有1 个高峰期(11 :00 ~ 13 :00)。吼叫行为的高峰期出现在7 :00 ~ 9 :00 时间段;结合夜晚记录发现, 21 :00 ~ 23 :00 时间段也是一个吼叫高峰。扬子鳄的吼叫次数与水温差存在一定的关系, 吼叫次数最多的水温差为3.5 ℃, 在1.5 ~ 3.5 ℃吼叫最频繁。笔者认为, 该时期扬子鳄的活动行为主要受繁殖因素的影响。图3参36
关键词:
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动物学 /
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扬子鳄 /
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行为 /
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活动节律 /
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发情期
Abstract:
Time budget and activity rhythm of Chinese alligators (Alligator sinensis) during daytime had been studied in Hongxing Reservoir of Anhui Chinese Alligator National Reserve from May to June in 2004 .The results showed that the behaviors of Chinese alligators include swimming , basking , resting , bellowing , mating and so on . Among them, swimming , resting , basking and bellowing take up (34.30 26.27)%, (30.44 18.50)%, (21.0432.95)% and (14.1618.97)% of the diurnal activity percentages respectively .The percentages that swimming takes up in the different time period are close to each other , ranging between 26.47 % and 44.83 %(2=6.906 5 , P =0.227 7 , df =5), but Chinese alligators usually don't keep a sort of poses in the course of swimming .Two peaks are characteristic of resting behavior , ranging from 9 :00 to 11 :00 and from 17 :00 to 19 :00 respectively .Basking comes forth and has only a peak between 11 :00 and 13 :00 after 3 June .Two bellowing peaks observed are from 7 :00 to 9 :00 and from 21 :00 to 23 :00 . Bellowing is related to the difference of water temperature (DWT).Chinese alligators frequently bellow when DWT is between 1.5 ℃ and 3.5 ℃, and the biggest bellowing times take place at 3.5 ℃.It is suggested that the behaviors of Chinese alligators are mainly affected by their reproductive factor in the rutting season .[ Ch , 3 fig .36 ref .]