Shorebird Surveys at The Nature Conservancy Dangermond Preserve 2020-2024

Shorebird population surveys were conducted by Point Blue Conservation Science on beaches at Dangermond Preserve during winter and spring from 2020-2024. These surveys are species counts observed during a walking transect survey on the beach, and can be considered area counts for each beach segment. Beaches were divided into segments of approximately 250m length and the survey area covers the width of the beach. One observer would walk the stretch of beach recording shorebirds, seabirds, and raptors observed using binoculars. Other bird species of note were recorded when observed. The presence of coyote, pig, and racoon tracks was also recorded. Wrack deposition quantity was enumerated, using a density score (1-5), the percent of wrack that was seagrass, and the quantity of velella velella on the beach using a density score (1-5). Survey timing is not consistent due to weather related access issues, however surveys were conducted in October, November, December, January, February, and May when possible. Beaches surveyed include North Beach, Government Beach, Big Cojo Beach, Percos Beach, and Little Cojo Beach.

2020年至2024年冬春两季，蓝点保护科学（Point Blue Conservation Science）于丹杰蒙德保护区（Dangermond Preserve）的海滩开展了滨鸟种群调查。本次调查采用海滩步行样带法开展观测并统计鸟类物种数量，可视为各海滩区段的面积计数结果。调查海滩被划分为长度约250米的区段，调查范围覆盖海滩全宽区域。由一名观测者沿海滩步行，使用双筒望远镜记录观测到的滨鸟、海鸟与猛禽；同时记录所有偶遇的其他值得关注的鸟类物种。此外还记录郊狼、家猪与浣熊（racoon）的足迹存在情况。针对海滩海藻碎屑沉积量，本次调查采用1-5级密度评分进行量化，同时统计海藻碎屑中海草占比，并对海滩上的帆水母（Velella velella）数量采用1-5级密度评分予以记录。受天气导致的通行限制影响，调查时间并不固定，但尽可能在10月、11月、12月、1月、2月及5月开展调查。本次调查涉及的海滩包括北滩（North Beach）、政府滩（Government Beach）、大科霍海滩（Big Cojo Beach）、佩科斯海滩（Percos Beach）与小科霍海滩（Little Cojo Beach）。