Quick-release cages and repetitive censusing of sessile epifauna

Abstract

Quick-release cages of Vexar (plastic) are attached by Velcro to frames (anchored with Rawl-studs and sealed with epoxy) and placed over in situ populations on rock of any orientation. These cages are strong, economical, and easily removed for cleaning and repeated censusing of the same quadrats with minimal disturbance to the biota. Rawl-studs and quick-release cages permit in situ studies in water depths approaching the limits of SCUBA. The projecting studs provide repeatable registration of the grid used for close-up photocensusing. Similar cages are used for transplanted epibenthos.