Avian Point Count Surveys from Yáláƛi (Goose Island) Archipelago, British Columbia, Canada in 2011

This file contains some data used in the article, "Comparing historical and contemporary observations of avian fauna across 75 years on the Yáláƛi (Goose Island) Archipelago, British Columbia, Canada" by Obrist et al. currently in peer-review as a Nature Note at Ecology and Evolution. A DOI to the article will be added upon publication. Specifically, these data refer to the 2011 Surveys by Simon Fraser University (SFU) Researchers. Avian point count surveys were conducted in 2011 at 50 locations across the six main islands of Yáláƛi, the Goose Island Archipelago (i.e., Goose, Gosling, Gull, Duck, Snipe, and Swan Island). Locations were chosen to replicate surveys within the four main habitat types outlined by Charles J. Guiguet (1953) (i.e., climax forest, ecotone, muskeg, meadow). Points were surveyed three times during the breeding season, between May 12th and June 2nd, 2011. The date, survey number, start time, point ID, temperature, and weather were recorded for each point count. A single observer recorded all birds seen and heard within a 100 m radius of each point for 10 minutes, separating all observations into minute-long intervals. The distance between the observer (point) and bird was estimated for each observation. Point counts were conducted within five hours of sunrise. Protocols based on Huff et al. (2000) Please see the article at DOI for a more comprehensive description of the data collection and processing. File: GooseIslandBirds_Data.xlsx This excel file contains the following sheets: 1.) Relative Abundance Comparisons: The comparisons of totals between 2011 survey data and data collected by Charles Guiguet (1953). 2.) Point Count Summaries: Shows the way the 2011 totals in Sheet 1 (Relative Abundance Comparisons) was calculated, showing the total abundance for each species for each of the 3 visits, and the total from the Casual Observations sheet. 3.) Raw Point Counts 4.) Casual Observations (Caution: observations beyond line 457 are considered duplicates of individuals already accounted for on point counts). 5.) Locations 6.) Metadata (READ FIRST)本数据集配套于Obrist等人的研究文章《加拿大不列颠哥伦比亚省亚拉利群岛（鹅岛群岛）75年间鸟类区系历史观测与当代观测对比》（Comparing historical and contemporary observations of avian fauna across 75 years on the Yáláƛi (Goose Island) Archipelago, British Columbia, Canada），该文章目前正处于《Ecology and Evolution》期刊Nature Note栏目的同行评议阶段，正式发表后将补充文章的数字对象唯一标识符（Digital Object Identifier, DOI）。本数据集特指西蒙弗雷泽大学（Simon Fraser University, SFU）研究者于2011年开展的调查数据。 2011年，研究团队在加拿大不列颠哥伦比亚省亚拉利群岛（鹅岛群岛，即Goose、Gosling、Gull、Duck、Snipe及Swan岛）的6个主岛内的50个点位，开展了鸟类点计数（avian point count）调查。 点位选取参照了Charles J. Guiguet（1953）划定的4类主要生境类型，即顶极森林（climax forest）、生态交错带（ecotone）、泥炭沼泽（muskeg）与草甸（meadow），以复现历史调查的生境覆盖范围。 2011年繁殖季（2011年5月12日至6月2日期间），每个点位共开展3次调查。 每次调查需记录的信息包括：调查日期、调查批次编号、开始时间、点位ID、气温与天气状况。 由一名观测者在每个点位周边100米半径范围内，以10分钟为时长记录所见及听闻的鸟类，并将所有观测结果按分钟间隔拆分记录。 针对每一次鸟类观测，需估算观测者所在点位与鸟类之间的距离。 所有点计数调查均在日出后5小时内完成。 本次调查的方案参照Huff等人（2000）的研究标准制定。 如需了解数据采集与处理的详细说明，请查阅该文章的DOI链接。 文件：GooseIslandBirds_Data.xlsx 本Excel文件包含以下工作表： 1. 相对丰度对比（Relative Abundance Comparisons）：对比2011年调查数据与Charles Guiguet（1953）采集的历史数据的物种总数。 2. 点计数汇总（Point Count Summaries）：展示工作表1（相对丰度对比）中2011年总数据的计算依据，即3次调查中每个物种的单次丰度总和，以及偶然观测记录（Casual Observations）工作表的汇总结果。 3. 原始点计数数据（Raw Point Counts） 4. 偶然观测记录（Casual Observations）（注意：第457行之后的观测记录视为点位计数中已统计个体的重复记录） 5. 点位信息（Locations） 6. 元数据（Metadata）（建议优先阅读）