Carmona Suarez and Conde Distribution and abundance of Calllnectes spp and Arenaeus cribmrius 



19 



most protected marine stations (2 and 1) followed by sta- 

 tion 4, which is located at the most exposed tract. The 

 values of Hill's diversity number 1 (Nl) demonstrated a 

 similar pattern and indicated that the number of abundant 

 species was close to two at stations 2 and 3. slightly above 

 this value at the estuarine station, and below at the most 

 exposed station. Offshore guild composition was substan- 



tially different from that at the sea margin, as shown by 

 pot samplings. Although several species were common to 

 the three biotopes, each habitat had a distinctive dominant 

 species: Aiviiaeus cribrarius at the siu'f zone (stations 1, 

 2, and 4), C. danae (station 3) in the estuarine pond, and 

 C. bocourti offshore. Because different sampling gears were 

 used at the sea border and offshore because of practical 



