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Comparing Growth and Body Condition of Indoor-reared, Outdoor-reared, and Direct-released Juvenile Mojave Desert Tortoises

机译:室内饲养,室外饲养和直接释放的少年莫哈韦沙漠乌龟的生长和身体状况比较

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Desert Tortoise (Gopherus agassizii) populations have declined, and head-starting hatchlings in captivity until they are larger and older, and presumably more likely to survive, is one strategy being evaluated for species recovery. Previous studies have reared hatchlings in outdoor, predator-proof pens for 5–9 y before release, in efforts to produce hatchlings in excess of 100–110 mm midline carapace length that are believed to be predation-resistant. We began a comparative study to evaluate indoor-rearing to shorten this rearing period by facilitating faster initial growth. We assigned 70 neonates from the 2015 hatching season to three treatment groups: (1) indoor-reared (n = 30), (2) outdoor-reared (n = 20), and (3) direct-release (n = 20). We released direct-release hatchlings shortly after hatching in September 2015 and monitored them 1–2 times per week with radio telemetry. We head-started the indoor- and outdoor-reared treatment groups for 7 mo before releasing them in April 2016. Indoor-reared tortoises were fed five times per week (September to March). Outdoor-reared tortoises had access to native forage and we gave them supplemental water and food once per week while active before winter dormancy. Indoor-reared tortoises grew 16 times faster than direct-release tortoises and 8 times faster than outdoor-reared tortoises; however, indoor-reared tortoises weighed less and had softer shells than comparatively sized older (3–4 y-old) tortoises raised outdoors. Increasing the duration of the indoor-rearing period or incorporating a combination of both indoor and later outdoor husbandry may increase shell hardness among head-starts, while retaining the growth-promoting effect of indoor rearing and shortening overall captivity duration.
机译:沙漠龟(Gopherus agassizii)的种群数量有所减少,圈养幼体直到它们变得更大和更老,并且大概更有可能生存,这才是评估物种恢复的一种策略。先前的研究已经将幼体在室外的,防食肉的圈养圈中放养了5-9年,以便生产出超过100-110毫米的中线甲壳长度的幼体,据信这种幼体具有抗捕食性。我们开始了一项比较研究,以评估室内饲养通过促进更快的初期生长来缩短饲养期。我们将2015年孵化季节的70名新生儿分为三个治疗组:(1)室内饲养(n = 30),(2)户外饲养(n = 20)和(3)直接释放(n = 20) 。在2015年9月孵化后不久,我们发布了直接释放的孵化器,并通过无线电遥测每周对其进行1-2次监控。我们开始了室内和室外饲养的治疗组,为期7个月,然后于2016年4月将其释放。室内饲养的陆龟每周进食5次(9月至3月)。户外饲养的乌龟可以吃当地的草料,我们每周给它们补充一次水和食物,而冬季休眠之前要活跃。室内饲养的陆龟的生长速度比直接释放陆龟快16倍,比室外饲养的陆龟快8倍;但是,室内饲养的乌龟比在室外饲养的较大尺寸的旧(3-4岁)乌龟重量更轻,外壳更软。增加室内饲养期的持续时间或将室内饲养和后来的室外饲养结合起来,可以提高刚开始时的蛋壳硬度,同时保持室内饲养对生长的促进作用,并缩短总体人工饲养时间。

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