佛罗里达州Rainey Slough的东部王蛇(Lampropeltis getula)生态学:一个消失的伊甸园

IF 1.1 2区 生物学 Q3 ZOOLOGY Herpetological Monographs Pub Date : 2017-05-23 DOI:10.1655/HERPMONOGRAPHS-D-16-00006.1
J. Godley, B. Halstead, R. Mcdiarmid
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引用次数: 1

摘要

摘要:东部Kingsnake(Lampropeltis getula)是爬行动物群落的重要组成部分和捕食者,但在过去几十年中,许多东部Kingsnak的数量急剧下降,尤其是在美国东南部。在这里,我们描述了1974年至1978年在佛罗里达州南部Rainey Slough的运河岸边——凤眼莲(Eichhornia crassipes)群落中对L.getula进行的一项密集捕获-标记-再捕获研究,其中成年凤眼莲的年捕获概率在0.662至0.787之间。描述了种群规模和结构、季节性活动、迁徙、微栖息地使用、行为、热生态和捕食者-猎物关系。在这个地点,王蛇主要在冬季和春季容易被捕获,是白天活动的,利用运河岸边的啮齿动物(Sigmodon hispidus)洞穴作为夜间休养地,并在13-26%的采样日从洞穴中出现。洞穴的使用在两性之间的重叠是广泛的,没有领土性的证据。Kingsnakes很乐意进入水葫芦中晒太阳、寻找配偶和觅食。在Rainey Slough,在王蛇的饮食中只发现了蛇。同时对风信子和运河岸边的潜在蛇猎物进行采样,发现有10个物种在两个采样栖息地的用途和体型上有所不同。一项范围广泛的分析证实,在佛罗里达州,蛇、爬行动物蛋和蜥蜴按降序排列,在L.getula的饮食中占主导地位(94.8%),在其他地方仍然是重要的猎物类型(80.2%)。在Rainey Slough,水葫芦中六种半水生蛇的密度平均为3534条/公顷,年均生物量为135.8公斤/公顷,王蛇生物量仅为捕食蛇生物量的2.2~3.9%。我们估计,王蛇种群每年消耗36.82–63.58公斤,约占水葫芦群落现存蛇产量的10.0–17.2%。成年雄性L.getula在春季繁殖季节平均损失39.3%的体重,而雌性在同一时期仅损失3.4%。此后,两性的身体状况指数都有了显著改善。在Rainey Slough 2006年至2010年的后续调查中,没有发现王蛇。水葫芦中的半水生蛇密度比20世纪70年代低77.2%(807.4/公顷),仅由三个物种组成。与其他地方的L.getula种群神秘的减少和灭绝相比,Rainey Slough的主要原因可能是1979年冬春季道路重建和铺设以及随后的道路死亡造成的不可持续的死亡。本文还讨论了在该系统中其他可能导致葛氏乳杆菌灭绝的病原体。
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Ecology of the Eastern Kingsnake (Lampropeltis getula) at Rainey Slough, Florida: A Vanished Eden
Abstract: Eastern Kingsnakes (Lampropeltis getula) are an important component and predator in herpetofaunal communities, but many Eastern Kingsnake populations have declined precipitously in the last few decades, particularly in the southeastern United States. Here, we describe an intensive capture–mark–recapture study of L. getula conducted during 1974–1978 in a canal bank–Water Hyacinth (Eichhornia crassipes) community at Rainey Slough in southern Florida, where annual capture probabilities of adults ranged from 0.662–0.787. Population size and structure, seasonal activity, movements, microhabitat use, behavior, thermal ecology, and predator–prey relationships are described. At this site kingsnakes were susceptible to capture mostly in winter and spring, were diurnal, used rodent (Sigmodon hispidus) burrows on canal banks as nocturnal retreats, and emerged from burrows on 13–26% of the sampling days. Overlap of burrow use by both sexes was extensive with no evidence of territoriality. Kingsnakes readily entered the Water Hyacinths to bask, pursue mates, and forage. At Rainey Slough only snakes were detected in the diet of kingsnakes. Concurrent sampling of potential snake prey in the hyacinths and on canal banks revealed 10 species that varied in use of the two sampled habitats and in body size. A range-wide analysis confirmed that in descending order snakes, reptile eggs, and lizards dominate the diet of L. getula in Florida (94.8%) and remain important prey types elsewhere (80.2%). At Rainey Slough the density of six species of semiaquatic snakes in Water Hyacinths averaged 3534 individuals/ha with a mean annual biomass of 135.8 kg/ha, and kingsnake biomass was only 2.2–3.9% of prey snake biomass. We estimated that the kingsnake population consumed 36.82–63.58 kg/yr, or about 10.0–17.2% of the standing crop of snakes in the Water Hyacinth community. Adult male L. getula lost on average 39.3% of their body mass associated with the spring reproductive season, whereas females lost only 3.4% in the same period. Body condition indices for both sexes improved substantially thereafter. In follow-up surveys at Rainey Slough during 2006–2010 no kingsnakes were found. Semiaquatic snake densities in the Water Hyacinths were 77.2% lower (807.4/ha) than in the 1970s and consisted of only three species. Compared to the enigmatic declines and extirpation of L. getula populations elsewhere, at Rainey Slough the primary cause likely was unsustainable mortality from road reconstruction and paving in the winter–spring of 1979 and subsequent roadkill. Other potentially causative agents of extirpation of L. getula in this system are discussed.
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来源期刊
Herpetological Monographs
Herpetological Monographs 生物-动物学
CiteScore
5.40
自引率
0.00%
发文量
2
审稿时长
>12 weeks
期刊介绍: Since 1982, Herpetological Monographs has been dedicated to original research about the biology, diversity, systematics and evolution of amphibians and reptiles. Herpetological Monographs is published annually as a supplement to Herpetologica and contains long research papers, manuscripts and special symposia that synthesize the latest scientific discoveries.
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