Science Library - free educational site

Aquatic environments

Aquatic environments are diverse and include stratification of energy levels.

Freshwater

  • Lentic - still water ecosystems
  • Lotic - moving water ecosystems
  • Grazing food chain
  • Detrital food chain
Ecosystem
Stream ecosystem showing the multitude of organisms at all levels

Important Abiotic Factors

  • temperature
  • pH (acidity: low = more acidic, 7 = neutral, high = more alkaline)
  • DO = dissolved oxygen (related to BOD - biochemical oxygen demand, but a direct measurement of the amount of oxygen in water)
  • flow rate
  • substrate (bottom of the stream or river: hard or soft?)
  • nutrient availability

Evolution Review

The set of characteristics that enable an organism to succeed uder one set of environmental conditions limits ability to do equally well under differing conditions. e.g. organism in slow stream may not be successful in a fast flowing stream

As a result, areas that have similar environmental conditions should have a similar assemblage (community) of species. (see super-organism concept of succession as opposed to the individualistic concept of succession)

Exercise:

Choose one of the following organisms: learn the general facts about the organism, food source, common habitat, life cycle, etc.

Stonefly larvae
Stonefly larvae
Stonefly
Stonefly

Mayfly nymph
Mayfly nymph
Mayfly
Mayfly

Caddisfly larva
Caddisfly
Caddisfly larva
Caddisfly larva

Dragonfly larvae
Dragonfly larvae
Dragonfly
Dragonfly

Horsefly larvae
Horsefly larvae
Horsefly
Horsefly

Freshwater shrimp
Freshwater shrimp
Freshwater shrimp
Freshwater shrimp (female)

Characteristics of a water body: these need to be measured and recorded with each field trip

  • flow rate
  • depth
  • width
  • temperature
  • DO: dissolved oxygen
  • nutrients
River ecology
River ecology is a favourite activity in schools

Other considerations include biotic factors, vegetation type and abundance, and any zonation that is present.

Content © Renewable-Media.com. All rights reserved. Created : February 18, 2014 Last updated :August 21, 2015

Latest Item on Science Library:

The most recent article is:

Trigonometry

View this item in the topic:

Vectors and Trigonometry

and many more articles in the subject:

Subject of the Week

Environment

Environmental Science is the most important of all sciences. As the world enters a phase of climate change, unprecedented biodiversity loss, pollution and human population growth, the management of our environment is vital for our futures. Learn about Environmental Science on ScienceLibrary.info.

Environmental Science

Great Scientists

Matthias Schleiden

1804 - 1881

Matthias Schleiden was one of the Cell Theory trio, along with Theodor Schwann and Rudolf Virchow, whose individual work together produced the modern Cell Theory.

Matthias Schleiden
ScienceLibrary.info

Quote of the day...

A carbon tax would be 'win-win-win-win-win' for the United States. It would reduce harmful emissions, generate funds for the deficit, weaken petro dictators, strengthen the dollar, drive clean-tech innovation, and stil leave some money to lower corporate and income taxes. However, it is entirely off the table, while self-defeating proposals are on it.

ZumGuy Internet Promotions

Transalpine traduzioni