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Reproductive biology and behavior of the brown tree snake (Boiga irregularis) on Guam.

机译：关岛棕树蛇（Boiganormalis）的生殖生物学和行为。

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摘要

While there are many more species of reptiles in the tropics than in temperate latitudes, relatively little is known about the natural history of tropical species of snakes. Even basic information, such as reproductive ecology and behavior, is lacking. Patterns of reproduction in tropical species differ from patterns in temperate species in important ways, such as the duration of gonadal activity and environmental factors that influence the frequency and timing of reproductive bouts. One tropical species, the brown tree snake (Boiga irregularis), was accidentally brought to the island of Guam and quickly became established throughout the island. Although this population has been monitored for over twenty years, many aspects of its basic biology, including its reproductive cycle, have yet to be described. The purpose of this dissertation research was to describe the reproductive biology and behavior of brown tree snakes on Guam. I used aggregation and shelter choice trials to determine whether females show aggregation behavior and to identify the cues that elicit aggregation. Reproductive state of the test snakes did not affect their response to the scent of a single male or female, but did change their response to multiple female scents. Measurements of gonad development and steroid hormones over a four-month period from captive snakes on Guam were compared to those obtained over the same time period from free-living snakes. Reproduction on Guam was found to be extended but seasonal, with females becoming vitellogenic in the latter part of the dry season and into the wet season. I also found that the corticosterone stress response did not vary with sex, size, or body condition, but the response of gonad sex hormones to acute stress was greater in larger snakes. I measured the body condition index and corticosterone levels of brown tree snakes on Guam to determine whether that population still showed the chronic stress and poor condition apparent in an earlier study. Significantly lower levels of corticosterone in all snakes in 2003 suggests that although juveniles did not have significantly improved energy stores they, along with mature males and females, were no longer under chronic levels of stress.
机译：尽管热带地区的爬行动物种类多于温带地区，但对热带蛇的自然历史了解甚少。甚至缺乏基本信息，例如生殖生态学和行为。热带物种的繁殖方式在重要方面不同于温带物种的繁殖方式，例如性腺活动的持续时间和影响生殖发作频率和时间的环境因素。一种热带物种，棕色的树蛇（不规则Boiga）被意外带到关岛，并在整个岛上迅速建立。尽管对该种群进行了二十多年的监测，但其基本生物学的许多方面（包括生殖周期）尚未得到描述。本论文的目的是描述关岛棕树蛇的繁殖生物学和行为。我使用聚集和庇护所选择试验来确定雌性是否表现出聚集行为并确定引发聚集的线索。试验蛇的生殖状态不会影响它们对单个雄性或雌性气味的反应，但会改变其对多种雌性气味的反应。将关岛关押的蛇在四个月期间的性腺发育和类固醇激素的测量值与同期从自由生活的蛇获得的测量值进行了比较。发现关岛的繁殖期延长，但季节性增加，雌性在旱季后期和雨季变得卵黄。我还发现皮质类固醇的应激反应不会随性别，大小或身体状况而变化，但是大蛇中性腺性激素对急性应激的反应更大。我在关岛上测量了棕树蛇的身体状况指数和皮质酮水平，以确定该种群是否仍显示出长期压力和较差的状况，这在早期的研究中是显而易见的。 2003年，所有蛇中的皮质酮水平显着降低，这表明尽管少年的能量存储没有明显改善，但它们以及成年的雄性和雌性都不再处于慢性压力水平。

著录项

  • 作者

    Waye, Heather L.;

  • 作者单位

    Oregon State University.;

  • 授予单位 Oregon State University.;
  • 学科 Biology Ecology.;Biology Animal Physiology.;Biology Zoology.
  • 学位 Ph.D.
  • 年度 2007
  • 页码 175 p.
  • 总页数 175
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 生态学（生物生态学）;动物学;生理学;
  • 关键词

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