RNR 1001 Study Guide - Midterm Guide: Rangeland, Shortgrass Prairie, Supersaturation
Document Summary
Dominant commercial fisheries groups: finfishes, crustaceans, and molluscs, kelp. Stock fluctuations due to exploitation and environmental factors. Habitat loss and degradation have also played an important role. Controlling fishing effort through limits on harvest, gear, crew size, area, season, etc. Fatigue due to high density of water. Swimbladder problems because of the pressure/depth relationship. Stress from the temperature/dissolved oxygen relationship for poikilotherms. Turbidity problems, reduced primary production, invertebrate mortality, larval fish mortality, reduced foraging by visual predators. Bioaccumulation and biomagnification problems because of movement of chemicals across thin gill tissue. Indeterminate growth - fisheries advantage, continued growth through life, catch and release viable. Type iii survivorship, high fecundities, but high juvenile mortality. Complex trophic ontogeny requires consideration of food resources at all life history stages. High population diversity because of reproductive isolation. Evolutionarily significant units, designation of critical habitat under the esa. Complex life histories often result in high juvenile mortality. Important commercially harvested invertebrates - high economic value.
