Figures & data
FIGURE 1. Map of the study areas in the Kongsfjord region of northwestern Spitsbergen, Svalbard. Work conducted at the sites was as follows: Site A (Brøgger Peninsula)—reindeer exclosure experiment, extensive monitoring plots; Site B (Blomstrand)—extensive monitoring plots; Site C (Brøgger Peninsula)—tagged reproductive shoots and trampiometers
FIGURE 2. Percentages of reproductive shoots within defined categories during the reindeer exclosure experiment on the Brøgger Peninsula (Site A) from 27 June to 22 July 1997 (corresponding to Julian dates 178 to 203). Fig. 2(a) shows data from the exclosures (protected from reindeer); Fig. 2(b) shows data from the plots open to reindeer
FIGURE 3. Numbers of reproductive shoots (m−2) within defined categories at the extensive monitoring plots on the Brøgger Peninsula (Site A, Fig. 3a) and on Blomstrand island (Site B, Fig. 3b) on the dates shown (n = 5 replicate plots). The transformations between these dates are also indicated. The coefficiants of variation for herbivory categories were 25.6% and 179.9% for the Brøgger Peninsula and Blomstrand island plots, respectively
FIGURE 4. Phenological stages of tagged Dryas shoots at site C in 1999
Table 1a. Species cover data, expressed as percentage of total, for Site A plots with experimental exclosures (A1 and A2) on the Brøgger Peninsula (7 July 1997) and for Site B plots with extensive monitoring on Blomstrand Island (15 July 1997). Measurements at each location are based upon 4 10-m line transects, with recording every 100 mm (first hit only) to give a total of 400 observations (and therefore resolution down to 0.25% cover). Standard error of the mean is in parenthesis. Locations of Sites A and B are given in
Table 1b. Species cover data, expressed as percentage of total, for Dryas mats at Site C, representative of plots with tagged reproductive shoots. Ten point frame quadrats of size 0.5 × 0.5 m were placed over representative Dryas mats spread throughout the study site on 28 June 1999. Data from first hits only were used to give a total of 1000 observations. Standard error of the mean is in parenthesis. Location of Site C is given in
Table 2. Reindeer presence shown by trampiometers (weekly) and grazing events at site C in 1999. One or more flattened nails suggest the presence of reindeer at the site. Two hundred Dryas buds were tagged at the begining of week 26. No recording was carried out in week 33
Table 3. Summary statistics of the repeated-measures ANOVA for the reindeer exclosure experiment at Site A. Response variables tested were the percentage (arcsin transformed) of total flowering shoots that could be classified within the different categories
