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首页> 外文期刊>Ecological indicators >Influence of salinity on relative density of American crocodiles (Crocodylus acutus) in Everglades National Park: Implications for restoration of Everglades ecosystems
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Influence of salinity on relative density of American crocodiles (Crocodylus acutus) in Everglades National Park: Implications for restoration of Everglades ecosystems

机译：盐度对大沼泽地国家公园美国鳄（Crocodylus acutus）相对密度的影响：对大沼泽地生态系统恢复的启示

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摘要

The status of the American crocodile (Crocodylus acutus) has long been a matter of concern in Everglades National Park (ENP) due to its classification as a federal and state listed species, its recognition as a flagship species, and its function as an ecosystem indicator. Survival and recovery of American crocodiles has been linked with regional hydrological conditions, especially freshwater flow to estuaries, which affect water levels and salinities. We hypothesize that efforts to restore natural function to Everglades ecosystems by improving water delivery into estuaries within ENP will change salinities and water levels which in turn will affect relative density of crocodiles. Monitoring ecological responses of indicator species, such as crocodiles, with respect to hydrologic change is necessary to evaluate ecosystem responses to restoration projects. Our objectives were to monitor trends in crocodile relative density within ENP and to determine influences of salinity on relative density of crocodiles. We examined count data from 12 years of crocodile spotlight surveys in ENP (2004-2015) and used a hierarchical model of relative density that estimated relative density with probability of detection. The mean predicted value for relative density (lambda) across all surveys was 2.9 individuals/km (95% CI: 2.0-4.2); relative density was estimated to decrease with increases in salinity. Routes in ENP's Flamingo/Cape Sable area had greater crocodile relative density than routes in the West Lake/Cuthbert Lake area and Northeast Florida Bay areas. These results are consistent with the hypothesis that restored flow and lower salinities will result in an increase in crocodile population size and provide support for the ecosystem management recommendations for crocodiles, which currently are to restore more natural patterns of freshwater flow to Florida Bay. Thus, monitoring relative density of American crocodiles will continue to be an effective indicator of ecological response to ecosystem restoration.
机译：长期以来，美国鳄鱼（Crocodylus acutus）的地位一直在大沼泽国家公园（ENP）引起关注，因为它被归类为联邦和州列出的物种，被公认为旗舰物种，并且具有生态系统指标的功能。美国鳄鱼的生存和恢复与区域水文状况，特别是流向河口的淡水有关，这会影响水位和盐度。我们假设通过改善向ENP内河口的水输送来恢复大沼泽地生态系统自然功能的努力将改变盐度和水位，进而影响鳄鱼的相对密度。监测诸如鳄鱼等指标物种对水文变化的生态响应对于评估生态系统对恢复项目的响应是必要的。我们的目标是监视ENP中鳄鱼相对密度的趋势，并确定盐度对鳄鱼相对密度的影响。我们检查了ENP（2004-2015）中12年的鳄鱼聚光灯调查的计数数据，并使用相对密度的分层模型估算了相对密度和检测概率。所有调查的相对密度（lambda）的平均预测值为2.9个人/公里（95％CI：2.0-4.2）；相对密度估计随着盐度的增加而降低。与西湖/库伯特湖地区和东北佛罗里达湾地区的路线相比，ENP的火烈鸟/开普萨布尔地区的路线具有更高的鳄鱼相对密度。这些结果与以下假设相吻合：流量恢复和盐度降低将导致鳄鱼种群数量增加，并为鳄鱼的生态系统管理建议提供支持，该建议目前旨在恢复流向佛罗里达湾的淡水的更多自然形态。因此，监测美洲鳄的相对密度将继续是生态系统对生态系统恢复作出生态反应的有效指标。

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  • 来源
    《Ecological indicators》 |2019年第7期|608-616|共9页
  • 作者

    Mazzotti Frank J.; Smith Brian J.; Squires Michiko A.; Cherkiss Michael S.; Farris Seth C.; Hackett Caitlin; Hart Kristen M.; Briggs-Gonzalez Venetia; Brandt Laura A.;

  • 作者单位

    Univ Florida, Ft Lauderdale Res & Educ Ctr, Dept Wildlife Ecol & Conservat, 3205 Coll Ave, Ft Lauderdale, FL 33314 USA;

    US Geol Survey, Wetland & Aquat Res Ctr, Ctr Collaborat Res, Cherokee Nation Technol, 3321 Coll Ave, Ft Lauderdale, FL 33314 USA;

    Univ Florida, Ft Lauderdale Res & Educ Ctr, Dept Wildlife Ecol & Conservat, 3205 Coll Ave, Ft Lauderdale, FL 33314 USA;

    US Geol Survey, Wetland & Aquat Res Ctr, Ctr Collaborat Res, 3321 Coll Ave, Ft Lauderdale, FL 33314 USA;

    Univ Florida, Ft Lauderdale Res & Educ Ctr, Dept Wildlife Ecol & Conservat, 3205 Coll Ave, Ft Lauderdale, FL 33314 USA;

    Univ Florida, Ft Lauderdale Res & Educ Ctr, Dept Wildlife Ecol & Conservat, 3205 Coll Ave, Ft Lauderdale, FL 33314 USA|US Geol Survey, Wetland & Aquat Res Ctr, Ctr Collaborat Res, 3321 Coll Ave, Ft Lauderdale, FL 33314 USA;

    Univ Florida, Ft Lauderdale Res & Educ Ctr, Dept Wildlife Ecol & Conservat, 3205 Coll Ave, Ft Lauderdale, FL 33314 USA;

    US Fish & Wildlife Serv, 3205 Coll Ave, Davie, FL 33314 USA;

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  • 正文语种 eng
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  • 关键词

    Florida Bay; Spotlight surveys; Detection probability; Indicator species; Estuaries;

    机译：佛罗里达湾;聚光灯调查;探测概率;指标种类;河口;

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