Demographics of Lestes disjunctus disjunctus (Odonata: Zygoptera) in a riverine wetland
Demographics of Lestes disjunctus disjunctus (Odonata: Zygoptera) in a riverine wetland
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河流湿地中的 Lestes disjunctus disjunctus（蜻蜓目：Zygoptera）的种群统计
DOI：
10.1139/z94-124
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
W. Duffy
中科院分区：
文献类型：
--
作者：
W. Duffy
我调查了居住在密歇根州圣玛丽河附近的河流湿地的 Lestes disjunctus disjunctus 的人口统计数据。测量了 4.03 公顷研究区域内覆盖类型的面积范围，并测量了 L. d. 所有生命阶段的密度。不同覆盖类型中的分离被转换为人口估计。然后使用生命表技术分析数据。 1982 年的研究小组在 4.03 公顷的研究区域内产下了大约 944 300 个卵。卵阶段死亡率估计为 22.6%，其中 6.0% 与孵化有关，16.6% 与栖息地丧失有关。所有幼虫龄期的存活率为 5.5%。幼虫平均产量为 135 mg 干质量∙m−2∙year−1。末龄幼虫的死亡率最高。 F-8 至 F-6 龄从残骸分散到三棱苗床上。 F-2龄至F龄的雌雄比为1.08:1.00，在成虫阶段为1.91:1.00至1.01:1.00。估计有 20 100 只成年雌性从占地 4.03 公顷的保护区中出现。
I investigated the demographics of Lestes disjunctus disjunctus inhabiting a riverine wetland adjacent to the St. Marys River, Michigan. The areal extent of cover types within the 4.03-ha study area was measured and the densities of all life stages of L. d. disjunctus in separate cover types were converted to population estimates. Data were then analyzed using life-table techniques. The 1982 cohort oviposited an estimated 944 300 eggs in the 4.03-ha study area. Mortality in the egg stage was estimated to be 22.6%, of which 6.0% was associated with hatching and 16.6% was attributed to habitat loss. Survival through all larval instars was 5.5%. Mean larval production was 135 mg dry mass∙m−2∙year−1. The mortality rate was greatest in final-instar larvae. Instars F-8 through F-6 dispersed from wracks to Sparganium eurycarpum beds. The female:male ratio of instars F-2 through F was 1.08:1.00 and varied from 1.91:1.00 to 1.01:1.00 in the adult stage. An estimated 20 100 adult females emerged from the 4.03-ha st...