Author Question: Describe the plankton collection methods used by researchers. Fill in the blank(s) with the ... (Read 27 times)

Metfan725 · **on:** Aug 22, 2018

Describe the plankton collection methods used by researchers. Fill in the blank(s) with the appropriate word(s).

Question 2

____________ are specialized organisms that are capable of life under extreme conditions Fill in the blank(s) with the appropriate word(s).

bigsis44 · **Reply #1 on:** Aug 22, 2018

Answer to Question 1

Plankton nets are conical nets that are customarily made of nylon or Dacron cloth woven in a
fine interlocking pattern to assure consistent spacing between threads. The net is hauled
slowly for a known distance behind a ship, or it is cast to a set depth, and then reeled in.
Trapped organisms are flushed to the pointed end of the net and carefully removed for
analysis. Quantitative analysis of plankton requires both a count of the organisms and an
estimate of the sampled volume of water. Very small plankton can slip through a plankton
net. Their capture and study requires concentration by centrifuge, or entrapment by a fine
plankton filter through which water is drawn. The filter is later disassembled and the
plankton studied in place. The smallest of plankton are trapped by specially made unglazed
porcelain filters through which water is forced under very high pressure.

Answer to Question 2

Extremophiles