Summary of Paper Fish in Offshore Kelp Forests Affect Recruitment to Intertidal Barnacle Populationa

The article „ Fish in Offshore Kelp Forests Affect Recruitment to Intertidal Barnacle Populationa“ written by S.D. Gaines and J. Roughgarden is about the influence that the composition of kelp forestes has on the recruitment of barnackle. The giant kalp lives in the pacific ocean of America and its composition depends on currents, predators, herbivores and weather. To study the inshore recruitment of barnackles they took probes of the klep beds inshore and offshore and analyzed the density of plankton throughout the year. Those Probes showed that during spring and summer the concentration of plankton was way more abundant than throughout the winter. In the offshore kelp beds the B. Glandula cyprids where a lot more abundant than in the inshore beds during summer and the same goes for the larval recruitment of B. Glandula. During the winter all concentration gradients reduce strongly and they coincided with the density of juvenile rockfish population what makes the the main cause of the concentration gradients. To sum it up there are two combined factors to the negative relation for barnacle recruitment. During the transit across the kelp bed they get killed by rockfish, the mortality depends on total stock of the fishs, and the size of the kelp forest.
The article “Coastal oceanography sets the pace of rocky intertidal community dynamics” is about the impact that large scale oceanograpic phenomens have in structure communities in New Zealand.
They wanted to find out if the coastal oceanography determines intercoastal differences in intertidal communities and therefore they analyzed the density of different organisms and also the oceanographic conditions and the subsidies and ecological processes in six different sites upwelling and downwelling. As a result they discovered that the community structure varied a lot due to oceanographically induced gradients. The larval transport and recruitment is highest in upwelling regions that mediates patterns of community