Seasonality of fish recruitment in a pulsed floodplain ecosystem: Estimation and hydrological controls

Seasonality of fish recruitment in a pulsed floodplain ecosystem: Estimation and hydrological controls
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脉冲洪泛区生态系统中鱼类补充的季节性:估计和水文控制

DOI:
10.1007/s10641-019-00856-9
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发表时间:
2019
影响因子:
1.4
通讯作者:
Trexler, Joel C.
Trexler, Joel C.
中科院分区:
环境科学与生态学3区
文献类型:
--
作者:
Gatto, John V.;Trexler, Joel C.

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水文变化被认为是控制滩地生态系统中鱼类补充的主要非密度因素。然而,我们完全理解这些控制的能力大大受制于采样装置的尺寸选择特性。为了说明估计大小选择性偏差对种群参数的影响的好处,我们使用队列分析重建了佛罗里达大沼泽地沿水文梯度属于鲤齿形目的5个物种20年的幼虫/新生儿丰度时间序列。我们应用了广义线性模型来估计新兵密度,并分析了我们的抽样齿轮的尺寸选择性。调整后的数据导致估计的招募密度增加了7至40倍,区域和地方空间尺度上的估计招募密度随季节变化,大多数物种在雨季结束时(10月、12月)达到最大;原始数据中没有明显的任何物种招募的一致季节性。利用调整后的数据,我们发现在短水期和中水期地点,所有物种的补充密度与沼泽干燥事件后的恢复时间呈正相关。然而,深度是在长水期地点招募人员的主要水文驱动因素。在站点内,我们观察到物种对年度水期变化的反应的种间差异。我们建议,渔业模型可以应用于任何网状采样渔具的数据,以改进丰度估计并揭示季节性补充动态。我们使用这些模型揭示了以前未被发现的季节性招聘动态,这对大沼泽地的恢复和管理的规划产生了影响。
Hydrological variation is believed to be the main density-independent factor that controls fish recruitment in floodplain ecosystems. However, our ability to fully understand these controls is greatly impeded by the size-selective nature of sampling gear. To illustrate the benefits of estimating the effects of size-selective bias on population parameters, we used a cohort analysis to reconstruct a 20-year time series of larval/neonate abundance for five species in the Order Cyprinodontiformes along a hydrological gradient in the Florida Everglades. We applied generalized linear models to estimate recruit density and analyze size-selectivity for our sampling gear. The adjusted data resulted in a 7 to 40-fold increase in estimated recruit density, which varied seasonally at regional and local spatial scales and was greatest at the end of the wet season (October, December) for most species; no consistent seasonality in recruitment of any species was apparent in the raw data. Using the adjusted data, we detected a positive relationship between recruit density and recovery time following marsh drying events at short and intermediate-hydroperiod sites for all species. However, depth was the major hydrological driver of recruitment at long-hydroperiod sites. Within sites, we observed interspecific variation in species responses to changes in annual hydroperiod. We suggest that fisheries models can be applied to data from any meshed sampling gear to improve abundance estimates and reveal seasonal recruitment dynamics. Our use of such models revealed seasonal recruitment dynamics that were previously undetected, with implications for planning of restoration and management of the Everglades.
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