Select all that apply. select all that apply. organism size increased by about 30% after the establishment of this reserve. the density of all the organisms in an area can be expected to increase after the establishment of a reserve. an increase in the number of predators in a community correlates with a decrease in the number of grazers (sea urchins in this case). kelp forest recovery in marine reserves is likely due to an increase in predators. because reserves have a higher diversity of species, individuals of each species are, on average, smaller. if lobster harvesting is prohibited in an area, sea urchin density would likely increase. sea urchin density is higher in marine reserves, probably as a result of decreased collection by commercial divers. although marine reserves predatory species such as sea otters and lobsters to thrive, there is only a slight effect on kelp. species diversity generally increases in marine reserves.