Planform change and Fundulus SNP data for small watersheds in South Mississippi and Louisiana

Fluvial geomorphic processes and the resulting patterns of landform
morphogenesis affect the distribution and connectivity of habitat patches
for aquatic organisms. Human alterations to fluvial geomorphic processes
may affect local habitat quality and stability, and affect connectivity of
habitat patches by altering the distribution, supply, and movement of
landform-generating materials. This dataset examines 17 watersheds in
south Mississippi and southeastern Louisiana and was used in preparation
of a manuscript addressing the hypothesis that elevated planform movement,
indicative of advanced fluvial erosion, would cause fragmentation among
populations of a headwater specialist (Blackspotted Topminnow Fundulus
olivaceus). The dataset includes numerous spatial features derived from
the NHD+ dataset used in planform measurements, spatial features digitized
from NAPP and NAIP aerial imagery measuring planform characteristics and
dynamics, additional metrics of each watershed, and a population genetics
dataset of single nucleotide polymorphisms (SNPs) for multiple individuals
at multiple sites per watershed. Associated code to recreate all analyses
in the manuscript is provided.

河流地貌过程及其催生的地貌形态发育模式，直接影响水生生物栖息地斑块的分布与连通性。人类对河流地貌过程的改造，不仅会改变局部栖息地的质量与稳定性，还可通过调控地貌形成物质的分布、供给与运移，进一步干扰栖息地斑块的连通性。本数据集针对密西西比州南部与路易斯安那州东南部的17个流域开展研究，其构建服务于一篇学术论文的撰写：该论文旨在验证一项假说——河道平面形态迁移加剧（即强烈河流侵蚀的表征），会导致上游狭适物种黑斑顶鳉（Blackspotted Topminnow, *Fundulus olivaceus*）的种群出现生境片段化。本数据集包含多类空间特征：其一为源自国家水文数据集增强版（National Hydrography Dataset Plus, NHD+）的河道平面形态测量数据；其二为通过国家航空摄影计划（National Aerial Photography Program, NAPP）与美国农业部农业影像计划（National Agriculture Imagery Program, NAIP）的航空影像数字化得到的、用于表征河道平面形态特征与动态变化的空间要素；此外还包含各流域的额外衍生指标，以及针对每个流域内多个采样点的多份个体样本的单核苷酸多态性（single nucleotide polymorphisms, SNPs）种群遗传学数据集。本数据集附带可复现论文中所有分析流程的配套代码。