Historic and contemporary use of catfish aquaculture by piscivorous birds in the Mississippi Delta

This dataset contains data used in the manuscript "Historic and contemporary use of catfish aquaculture by piscivorous birds in the Mississippi Delta", published in The Condor: Ornithological Applications. All data were collected in northwest Mississippi during winters (October - April) of 2000-2001, 2003-2004, 2015-2016, 2016-2017, and 2017-2018. Two primary types of data are present: 1) roost surveys, and 2) aquaculture cluster surveys. Roost surveys were aerial surveys in which all known double-crested cormorant night roosts in northwest Mississippi were surveyed and cormorants were counted. Roost survey data can be found in the “Cormorant_Roost_Survey_Counts.xlxs” file. For the aquaculture cluster surveys, clusters were defined as U.S. Geological Survey land survey sections that contained aquaculture. For each year of data, a random subset of these clusters were chosen to be aerial surveyed and double-crested cormorants, great blue herons, and great egrets were recorded per cluster. Basic descriptive statistics of the clusters can be found in the “Cluster_Descriptive_Stats.xlxs” file. The “Historic_vs_Contemporary_Cormorants.xlxs” file was used to compare cormorant density on aquaculture clusters between the historic period (2000-2001, 2003-2004) and contemporary period (2015-2016, 2016-2017, and 2017-2018). Lastly, the “Cluster_Survey_Data_Contemporary.xlxs” file contains data recorded during the contemporary period only, and other variables regarding the clusters are also present.

本数据集包含发表于《秃鹰：鸟类学应用（The Condor: Ornithological Applications）》的学术论文《密西西比三角洲食鱼鸟类对鲶鱼养殖业的历史与现代利用》中所使用的全部数据。所有数据采集于密西西比州西北部，采集时段为2000-2001、2003-2004、2015-2016、2016-2017及2017-2018年的冬季（10月至次年4月）。本数据集包含两类核心数据：1）夜栖地调查数据；2）水产养殖集群调查数据。夜栖地调查采用航空调查方式，对密西西比州西北部所有已知的双冠鸬鹚（double-crested cormorant）夜栖地开展普查并统计种群数量，相关数据存储于"Cormorant_Roost_Survey_Counts.xlxs"文件中。水产养殖集群调查中，"集群"被定义为包含水产养殖区域的美国地质调查局（U.S. Geological Survey）土地测绘地块；每一年度的调查中，会随机选取上述集群中的一部分开展航空调查，并记录每个集群内的双冠鸬鹚、大蓝鹭（great blue heron）与大白鹭（great egret）的种群数量。集群的基础描述性统计数据存储于"Cluster_Descriptive_Stats.xlxs"文件中。"Historic_vs_Contemporary_Cormorants.xlxs"文件用于对比历史时期（2000-2001、2003-2004）与现代时期（2015-2016、2016-2017、2017-2018）水产养殖集群上的鸬鹚种群密度。此外，"Cluster_Survey_Data_Contemporary.xlxs"文件仅包含现代时期的调查记录数据，同时也收录了与该类集群相关的其他变量信息。