SBC LTER: Santa Cruz Island: Aggregated mean abundance of black surfperch (Embiotoca jacksoni) and prey availability, 1994-2008

These data are the annual mean abundances of three age-classes of black surfperch and their prey at each of 11 sites at Santa Cruz Island, California. Reported values are a) the average number of adult black surfperch, young-of-year black surfperch, and one year-old black surfperch per 40m x 2m transect (for all transects), and b) total food availability (grams per 0.1 m squared) at each site. Food availability includes biomass of caprellid and gammarid amphipods and is calculated from the mean density within Gelidium spp. (for caprellids) and all other foliose or turfing algae (for gammarids). The data also include one year lags for each variable, i.e. the value of the variable at that site in the previous year.

本数据集收录了美国加利福尼亚州圣克鲁兹岛（Santa Cruz Island）11个采样点中，三种年龄组的黑扁鲈（black surfperch）及其猎物的年平均丰度。本次报告的数值包含两类：a) 所有40m×2m样带（transect）内，成年黑扁鲈、当年生黑扁鲈（young-of-year black surfperch）以及1龄黑扁鲈的平均个体数量；b) 各采样点的总食物可获得量（单位：克/0.1平方米）。食物可获得量涵盖麦秆虫（caprellid amphipods）与钩虾（gammarid amphipods）的生物量，其计算方式为：麦秆虫的生物量基于石花菜属（Gelidium spp.）藻类内的平均密度，钩虾的生物量则基于其余所有叶状或丛生藻类（foliose or turfing algae）内的平均密度。本数据集同时包含各变量的1年滞后值，即对应采样点上一年的变量观测值。