Riparian controls on light availability, primary producers, invertebrates, fish and salamanders in streams in and near the Andrews Experimental Forest, 2014-2018

The goal of this data collection effort was to determine how the age, stage, and structure of the riparian forest relates to stream primary producers and stream biota. Data were collected on stream habitat, benthic algal, biota (fish, salamanders and macroinvertebrates), and riparian forest cover across a total of 9 streams: 7 streams in the HJ Andrews basin/Lookout Creek stream network; one stream in the westward adjacent Blue River basin, and one stream in the eastward adjacent Deer Creek river basin. In each stream there were 2 study reaches – one bordered by old-growth riparian forest and the other bordered by regenerated second-growth riparian forest on at least one bank (with a stand ages that generally ranged between 30 and 60 years). In each study reach (80 – 150 m), we collected the following data: pool habitat, wetted and bankfull widths, large wood abundance and volume, riparian forest canopy cover, benthic algae accrual on tiles, stream macroinvertebrate abundances (from 6 replicate surber samplers, which were pooled and then sub-sampled, identified and measured), age 1+ cutthroat trout (Oncorhynchus clarkii clarkii) abundance and biomass, age 0+ (young-of-year) trout abundance and biomass, coastal giant salamander (Dicamptodon tenebrosus) abundance and biomass. Fish and salamander abundances were calculated by either mark-recapture or multiple pass depletion methods.

本数据集采集工作的核心目标，是明确河岸林的年龄、发育阶段与结构，与溪流初级生产者及溪流生物群落之间的关联。本次采集的数据涵盖溪流生境、底栖藻类、生物群落（鱼类、蝾螈及大型无脊椎动物）以及河岸林覆盖度，共覆盖9条溪流：其中7条位于HJ Andrews流域/Lookout Creek溪流网络；西侧相邻的Blue River流域内1条，东侧相邻的Deer Creek河流流域内1条。每条溪流设置2个研究样带：一个以老龄河岸林为边界，另一个至少单侧边界为更新后的次生河岸林（林分年龄通常介于30至60年之间）。每个研究样带长度为80至150米，在此范围内采集如下数据：深潭生境、湿润宽度与满岸宽度、大型木质残体的丰度与体积、河岸林冠层覆盖度、陶片基质上的底栖藻类附着量、溪流大型无脊椎动物丰度（通过6组重复萨伯采样器（Surber sampler）采集，样品混合后再进行分样、鉴定与计量）、1龄以上切喉鳟（Oncorhynchus clarkii clarkii）的丰度与生物量、0龄（当年幼鱼）鳟鱼的丰度与生物量，以及沿海巨型蝾螈（Dicamptodon tenebrosus）的丰度与生物量。鱼类与蝾螈的丰度通过标记-重捕法或多次抽捕移除法进行计算。