1. Two common species of acorn barnacle, Chthamalus montagui and C. stellatus , with similar resource needs, occur together on rocky shores of NW Europe but differ in their adult distribution over two environmental gradients, wave exposure and vertical height on the shore. 2. A sampling programme was undertaken over 2 years to determine the causal mechanisms of this differential distribution. T...

a carpe t of c rus tose , f i lamentous and tha l lous a lgae , and the remainder was d iv ided among sponges , sc lerac t in ian cora ls and o ther an imals . On the sha l low rocky shore , d i f fe rences in ambient i l luminat ion and t rapped sed iments brought about by subs t ra tum inc l ina t ion , a re regarded as the main fac tors in f luencing the greater cover of algae on open (horiz...

Rhizocephalan cirripedes are a very unique group of parasites infecting decapod crustaceans, but apart from few well-studied species, little is known on their ecology and impact hosts. Here we report the results 14-month study infestations rhizocephalan Parasacculina leptodiae in rocky shore crab Leptodius exaratus along shores Kuwait Persian (Arabian) Gulf. Monthly samples an intertidal gradie...