<i>Lanice conchilega</i>, fisheries and marine conservation: Towards an ecosystem approach to marine management

This doctoral thesis bridges experimental research and policy issues in the marine environment. The focus is on the challenging relation between nature conservation and current fisheries practices. The study sites investigated consist largely of sedimentary sand banks and swales, situated in North-Western Europe. A particular biogenic habitat has been chosen to study both the ecological importance and the resilience towards the physical disturbance of beam-trawling. This habitat is Lanice conchilega reefs, which are distinct aggregations of tube dwelling polychaetes (bristle worms). The implications of these tube worm reefs for the benthic environment as well as for flatfish species are studied in depth and several experiments (in lab and field conditions) quantify the impact of beam trawl fisheries. The thesis finishes by integrating these results in legal policy options and discusses the process of MPA-implementation. The general discussion elaborates how this thesis may contribute to the application of an ecosystem approach to support marine managemen

The resistance of <i>Lanice conchilega</i> reefs to physical disturbance

One way to generate detailed knowledge of the response to physical disturbance is quantifying the resistance of biogenically created emergent structures towards fisheries. The biogenic structures targeted in the present study are shaped by the ecosystem engineering polychaeteLanice conchilega. Direct mortality ofL. conchilega as a consequence of sustained physical disturbance at varying frequencies has been tested to quantify the resilience of this particular reef system. Research is based on a laboratory experiment in which four different disturbance regimes were applied (disturbance every other 12, 24 and 48 h and no fishing disturbance as a control). Survival proportions were measured over time and tested with a generalized linear mixed model (GLMM). Survival dropped ignificantly after 10 and 18 days (with a disturbance frequency of every 12 and 24 h, respectively). The results indicate that L.conchilega is relatively resistant to physical disturbance but that reef systems can potentially collapse under continuous high frequency disturbance. The results of this experiment are discussed in the light of beam trawl fisheries, a common physical disturbance in areas where knowledge of the general resilience

<i>Lanice conchilega</i>, fisheries and marine conservation: Towards an ecosystem approach to marine management

This doctoral thesis bridges experimental research and policy issues in the marine environment. The focus is on the challenging relation between nature conservation and current fisheries practices. The study sites investigated consist largely of sedimentary sand banks and swales, situated in North-Western Europe. A particular biogenic habitat has been chosen to study both the ecological importance and the resilience towards the physical disturbance of beam-trawling. This habitat is Lanice conchilega reefs, which are distinct aggregations of tube dwelling polychaetes (bristle worms). The implications of these tube worm reefs for the benthic environment as well as for flatfish species are studied in depth and several experiments (in lab and field conditions) quantify the impact of beam trawl fisheries. The thesis finishes by integrating these results in legal policy options and discusses the process of MPA-implementation. The general discussion elaborates how this thesis may contribute to the application of an ecosystem approach to support marine managemen

Justice Farms and the Mediation of New and Old Detroiters: An Ethnography of a Detroit Urban Farm

Honors (Bachelor's)SociologyUniversity of Michiganhttps://deepblue.lib.umich.edu/bitstream/2027.42/139644/1/mrrabaut.pd