Dissolved Oxygen and Aquatic Primary Productivity

A team of researchers, students, and local staff surveyed the vertebrate and invertebrate species in four areas of the Okavango Delta in northwestern Botswana. The survey reports water quality as benign and healthy with the exception of low dissolved oxygen levels. About a fourth of the 1250 plant species known from the Delta were recorded and were found to have moderate diversity and surprisingly uniform populations. The findings of diversity in the fish communities and a breeding colony harboring fourteen endangered bird species provide substantial support for the report's recommendations on conserving this ecologically significant area.

Aquatic Ecosystems explains the interplay between various movements of matter and energy through ecosystems mediated by Dissolved Organic Matter. This book provides information on how much DOM there is in a particular aquatic ecosystem and where it originates. It explains whether the DOM composition varies from time to time and place to place. It also details how DOM becomes incorporated into microbial food webs, and gives a better, clarifying, understanding to its significance of DOM. Dissolved Organic Matter (called DOM) is incredibly important in all aquatic ecosystems. Although it might seem that logs and leaves are more important, in fact the DOM is more crucial because the DOM is in a form that is available for use by all the organisms living in the the water. Furthermore, DOM influences complex food webs by mediating the availability of aquatic nutrients, metals, salts and minerals. DOM also affects water clarity, which of course has alters the way animals and plants live and feed in the water. There are many ways to study DOM and this book focuses on several central questions.

Oxygen depletion - Hypoxia or oxygen depletion is a phenomenon that occurs in aquatic environments as dissolved oxygen (DO; molecular oxygen dissolved in the water) becomes reduced in concentration to a point detrimental to aquatic organisms living in the system. Dissolved oxygen is typically expressed as a percentage of the oxygen that would dissolve in the water at the prevailing temperature and salinity (both of which affect the solubility of oxygen in water; see oxygen saturation and underwater).

Net primary productivity - In ecology, net primary productivity is the productivity of all green plant matter as the initial level of energy absorption from solar rays. The respective green plants absorb the solar energy through photosynthesis, with the primary result being food and a secondary biproduct of oxygen.

Primary productivity - Primary productivity is the amount of light energy converted to chemical energy in a given amount of time. It usually corresponds to the amount of photosynthesis that occurred.

Winkler test for dissolved oxygen - The Winkler test is used to determine the level of dissolved oxygen in fresh water samples. The test was first developed by Lajos Winkler while working on his doctoral dissertation in 1888.

dissolvedoxygenandaquaticprimaryproductivity

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