<i>Bosmina </i>spp. mucro and carapace measurements in sediment cores from two New Brunswick lakes (Upsalquitch and Goodwin) impacted by aerial insecticide application. Version 1.0.

Size measurements of <i>B. longirostris</i> and <i>E. longispina </i>(collectively <i>Bosmina </i>spp.) subfossils in sediment cores from Upsalquitch and Goodwin lakes, New Brunswick. These lakes had their watersheds aerially sprayed with dichlorodiphenyltrichloroethane (DDT) in the 1950s. Sediment cores were collected from these lakes in summer 2016. Cladoceran subfossils and DDT isomer concentrations were assessed to understand the impacts of aerial insecticide spraying on the lake and the food web. Size data were collected as they can help clarify changes to trophic dynamics associated with environmental stressors; specifically, <i>Bosmina </i>spp. mucro lengths are used as indicators of predation pressure and thus can help distinguish between planktivorous and piscivorous fish regimes.

本数据集包含加拿大新不伦瑞克省乌萨尔奎奇湖（Upsalquitch Lake）与古德温湖（Goodwin Lake）沉积物岩芯中，长额象鼻溞（*B. longirostris*）和长棘象鼻溞（*E. longispina*，二者同隶属于象鼻溞属（*Bosmina* spp.））的亚化石尺寸测量数据。上述两座湖泊的流域曾于20世纪50年代被航空喷施二氯二苯三氯乙烷（dichlorodiphenyltrichloroethane, DDT）。2016年夏季，研究人员从这两座湖泊中采集了沉积物岩芯。本研究通过分析枝角类（Cladoceran）亚化石与DDT异构体浓度，旨在明确航空喷施杀虫剂对湖泊生态系统及其食物网的影响。收集尺寸数据的意义在于，其可帮助厘清与环境胁迫因子相关的营养动态变化；具体而言，象鼻溞属（*Bosmina* spp.）的壳刺长度可作为捕食压力的指示指标，进而帮助区分浮游生物食性与鱼类食性的鱼类群落结构。