521
12 Species Case Studies
Fig. 12.57 Comparison of spawning aggregation areas of surgeonfi shes on a shelf edge reef off
southwestern Puerto Rico between 1977–1979 and 2011. ( a ) Aggregation area of ocean surgeonfi shes decreased considerably between the 1970s and 2011 and the numbers of fi sh decreased to
only about 5–10% of the roughly 20,000 seen in the 1970s. ( b ) Aggregation area of blue tang
remained similar in size, but changed shape and shifted somewhat in location. This map is based
on Colin and Clavijo ( 1988 , Fig. 6)
12 Species Case Studies
Fig. 12.57 Comparison of spawning aggregation areas of surgeonfi shes on a shelf edge reef off
southwestern Puerto Rico between 1977–1979 and 2011. ( a ) Aggregation area of ocean surgeonfi shes decreased considerably between the 1970s and 2011 and the numbers of fi sh decreased to
only about 5–10% of the roughly 20,000 seen in the 1970s. ( b ) Aggregation area of blue tang
remained similar in size, but changed shape and shifted somewhat in location. This map is based
on Colin and Clavijo ( 1988 , Fig. 6)