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Spatial Ecology, Movements, and Habitat Selection of Clemmys guttata in a Temporally Dynamic Wetland System in North Carolina, USA. 美国北卡罗莱纳州时间动态湿地系统中古苔草的空间生态、活动与生境选择
IF 0.6 4区 生物学 Q3 ZOOLOGY Pub Date : 2023-04-01 Epub Date: 2023-04-30
John H Roe

Turtle populations are in decline worldwide, requiring immediate conservation and management actions. For species with broad geographic ranges that cover diverse environmental contexts, region-specific information on declining species could inform more targeted management plans. I examined the ecology of a Spotted Turtle (Clemmys guttata) population in a temporally dynamic wetland system in the Southeastern Plains ecoregion of North Carolina. Turtles selected forested wetlands and streams while avoiding open wetlands and river habitats, but used terrestrial habitats minimally and randomly. Turtles responded to wetland drying by remaining in wetlands and maintaining modest levels of activity during short-duration drying events (< 1 mo), but moved very little during longer droughts (7 mo). Turtles had prolonged active seasons (February-October) as long as wetlands and streams were flooded, with movement rates peaking in late spring at 23.6 ± 3.7 m/d (mean ± standard error). Turtles had large home ranges (14.1 ± 4.3 ha) that often included multiple local stream networks used as movement corridors between forested wetland patches and as activity centers when wetlands dried. I suggest that conservation plans for C. guttata include large management areas that protect a network of streams and adjacent forested swamps in the Southeastern Plains and perhaps other lowland ecoregions in the Southeastern U.S. Because terrestrial habitats were not used for extended refuge during drought, certain low-impact land uses in adjacent terrestrial areas are not likely to negatively impact C. guttata populations, but terrestrial forests would still be important in maintaining overland travel corridors.

全世界的海龟数量正在下降,需要立即采取保护和管理行动。对于地理分布范围广、覆盖多种环境背景的物种,有关物种减少的区域特定信息可以为更有针对性的管理计划提供信息。我研究了北卡罗来纳州东南平原生态区内一个临时动态湿地系统中斑龟(Clemmys guttata)种群的生态学。海龟选择森林湿地和溪流,避开开放湿地和河流栖息地,但很少和随机地使用陆地栖息地。海龟对湿地干燥的反应是在短时间干旱事件(< 1个月)期间留在湿地并保持适度的活动水平,但在较长时间干旱(7个月)期间很少移动。只要湿地和溪流被淹没,海龟的活动季节(2月至10月)就会延长,移动速度在春末达到峰值,为23.6±3.7 m/d(平均值±标准误差)。海龟有很大的活动范围(14.1±4.3公顷),通常包括多个本地溪流网络,用作森林湿地斑块之间的活动走廊,以及湿地干涸时的活动中心。我建议古塔塔的保护计划包括大型管理区域,以保护东南部平原的溪流网络和邻近的森林沼泽,也许还有美国东南部的其他低地生态区域。因为陆地栖息地在干旱期间不用于长期避难,邻近陆地区域的某些低影响土地使用不太可能对古塔塔种群产生负面影响。但是陆生森林在维持陆上交通走廊方面仍然很重要。
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引用次数: 0
Among-population variation in monthly and annual survival of the Baja California Tree Frog, Pseudacris hypochondriaca curta, in desert oases of Baja California Sur, Mexico 墨西哥下加利福尼亚南部沙漠绿洲中下加利福尼亚树蛙月活和年活的种群变异
IF 0.6 4区 生物学 Q3 ZOOLOGY Pub Date : 2015-06-14 DOI: 10.5167/UZH-111197
V. Luja, R. Rodríguez-Estrella, M. Schaub, B. R. Schmidt
Survival is an important component of the demography of an animal. We estimated monthly and annual survival probabilities of three populations of the Baja California Treefrog (Pseudacris hypochondriaca curta) inhabiting desert oases of Baja California Sur, Mexico. We used data from a two-year mark recapture study to estimate survival. Recapture probabilities varied widely among months and there was no clear temporal pattern underlying the fluctuations. Annual survival was 27 and 29% for two populations and 1% for the third population. This implies that the populations, particularly the third one, can persist only if there is steady and high recruitment. With annual survival as low as 1–29%, a lack of recruitment could quickly cause local extinction. Because immigration seems unlikely in these populations due to their isolation from other breeding populations, recruits must be produced locally. Non-native fish, crayfish, and frogs that prey on tadpoles may therefore be a threat for the persistence of the populations.
生存是动物种群统计的一个重要组成部分。本文对生活在墨西哥下加利福尼亚南部沙漠绿洲的下加利福尼亚树蛙(Pseudacris hypochondriaca curta)三个种群的月生存率和年生存率进行了估算。我们使用了一项为期两年的标记再捕获研究的数据来估计生存率。在不同的月份中,重新捕获的概率差别很大,波动背后没有明确的时间模式。两个种群的年生存率分别为27%和29%,第三个种群的年生存率为1%。这意味着人口,特别是第三人口,只有在稳定和高招募的情况下才能维持下去。由于年存活率低至1-29%,缺乏补充可能很快导致当地灭绝。由于这些种群与其他繁殖种群的隔离,移民似乎不太可能在这些种群中出现,因此必须在当地生产新兵。因此,以蝌蚪为食的非本地鱼类、小龙虾和青蛙可能对种群的持久性构成威胁。
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引用次数: 5
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Herpetological Conservation and Biology
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