Consumer-driven Nutrient Recycling in Arctic Alaskan Lakes
Author | : Cody R. Johnson |
Publisher | : |
Total Pages | : 238 |
Release | : 2009 |
ISBN-10 | : OCLC:681920510 |
ISBN-13 | : |
Rating | : 4/5 ( Downloads) |
Download or read book Consumer-driven Nutrient Recycling in Arctic Alaskan Lakes written by Cody R. Johnson and published by . This book was released on 2009 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: "In lakes, fish and zooplankton can be both sources and sinks of nitrogen (N) and phosphorus (P) through the consumption of organic N and P, and subsequent excretion of bioavailable inorganic forms. These source/sink dynamics, known as consumer-driven nutrient recycling (CNR), may, in turn, control the availability of potentially limiting nutrients for algal primary production. In this dissertation I investigate the importance and controls of CNR as a source of inorganic N and P for primary production (Chapter 2). I then examine zooplankton CNR as a mechanism for increasing nutrient mean resident time (MRT) in the mixed layer of lakes (Chapter 3). Finally, I assess whether zooplankton communities dominated by different taxa can affect N versus P deficient conditions for phytoplankton production through differential N and P recycling rates (Chapter 4). Direct excretion of N and P by fish communities was modest in arctic lakes, and accounted for