BIOL 3450 Lecture Notes - Lecture 13: Trophic Cascade, Mekong, Water Purification
27 Oct 2017
School
Department
Course
Professor
Document Summary
Some ecosystem services of the inact floodplain: natural filter: stores excess nutrients, toxins, etc, water storage (buffers extreme events) Dai run by many people-company) and traditional artisanal or substance fisheries (small nets employed by family) Tonle sap: gear deployment and species selectivity in time and space. Gear sizes across year: relatively indiscriminate across time, space and fish sizes selecting small to large species and small to large indivduals. Western world different: (cid:498)target/selective(cid:499) fisheries: fishers select species and sizes fro various practical, economic, and regulatory reasons. Indiscriminate fishery: species are more less ignored and all fish species are sought with nearly equal propensity regardless of size or age, tropical floodplain fisheries developing countries (e. g. africa , southeast asia, target fishery, other fisheries, developed countries. Implications of an indiscriminate fishery: what happens to the tropical. Indiscriminate so all harvested at about equal per capita rates, f is per capita fishing mortalitiy (i. e harvested in proportion to species density)
