Dive Against Debris

Participate in or join a Dive Against Debris event. Dates Vary.

Dive against debrisIn response to the onslaught of marine debris, one of the biggest ocean issues of our time, Project AWARE launched Dive Against Debris. Created by divers for divers, this global, underwater survey of rubbish is designed to increase debris removal efforts, prevent harm to marine life and connect your underwater actions to policy changes and prevention.

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Assessing the Effects of Marine Protected Area (MPA) on a Reef Fish Assemblage in a Northwestern Mediterranean Marine Reserve

Claudet et al. evaluate how reef fish assemblages respond to a no-take reserve as compared to a non-managed site, accounting for habitat variability. This paper provides insight as to how one may want to test MPA effectiveness and identify indicator species. Indicator species monitoring may prove to be a cost effective management technique. They used an underwater visual census (UVC) technique and modeled their data to account for both spatial and temporal variations between the inside and outside of the MPA. Useful for individuals evaluating monitoring methods for MPAs.

Author: Claudet, J., D. Pelletier, J.-Y. Jouvenel, F. Bachet, and R. Galzin
Year: 2006
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Biological Conservation 130: 349-369. doi:10.1016/j.biocon.2005.12.030

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Repeated Bleaching Events May Result in High Tolerance and Notable Gametogenesis in Stony Corals: Oculina Patagonica as a Model

In this study, the authors assessed the effect of bleaching on gametogenesis of populations of the coral Oculina patagonica commonly undergoing repeated seasonal bleaching events (BE) along the Israeli Mediterranean coast, and compared it with the effect of first and second summer bleaching events on gametogenesis of a population that has not experienced a summer bleaching events in recent years. They found that a population that experienced a summer BE for the first time presented significantly lower reproductive parameters in bleached colonies when compared to non-bleached colonies.

Furthermore, in the following year, such bleached colonies showed an improvement in reproductive performance when compared to the previous year. The remarkable differences in gametogenesis between colonies experiencing first summer bleaching events and those experiencing repeated seasonal bleaching events may be the result of improved utilization of alternative energy sources. This study provides the first evidence for notable gametogenesis in corals undergoing repeated bleaching, and suggests that adjustment processes may increase tolerance levels and may play a role in the ability of corals to overcome the expected repeated bleaching events.

The findings suggest that coral species with a high tolerance to bleaching may overcome some energetic barriers to reproduction and complete gametogenesis during periods of repeated seasonal BEs. These species could become the dominant coral species on reefs and may help to prevent the loss of coral cover and phase shifts from a coral to an algae-dominated community.

Author: Armoza-Zvuloni, R., R. Segal, E. Kramarsky-Winter, and Y. Loya
Year: 2011
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Marine Ecology Progress Series 426: 149–159. doi:10.3354/meps09018

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