Berlese Tullgreen funnel
Method for extracting
invertebrates from soil and leaf
insect larvae, nematodes,
isopods, slugs, and snails,
as well as arachnid
Likely invertebrates expected to be trapped include ground-dwelling
spiders ground-dwelling beetles oligochaete annelids, slugs, etc
A solution of 0.2% formaldehyde is thoroughly applied to the soil of
desired area and the invertebrates emerging out collected. e.g.
earthworms and larva of many flies
Arthropod cuticle can be wetted by various hydrocarbon solvents
such as gasoline. A soil or leaf litter sample is placed in a mixture of
gasoline and water and shaken. The contents are then allowed to
settle. The arthropods will tend to be found in the gasoline layer
(which floats above the water) while soil, leaves, etc. will tend to be
found in the water layer.
A typical beat sheet is a square piece of white cotton sheeting with two
dowels that form a diagonal cross. The sheet is placed under the branch
of interest while the branch is shaken or tapped with a stick.
Silk, Organdie, Muslin, Teryline, Nylon, synthetic fibres
Planktons cannot swim against
Cylinders of known size slowly lowered onto water to collect
crustaceans and planktons
Water pumps and hose
Quantitative plankton sampling.
A pump with a rotary action and fitted with flexible
inlet and outlet hose pipes is generally used.
The inlet pipe is graduated to show the depth of the
A weight is also tied to the inlet hole of the hose which
makes the pipe easy to sink and keeps it vertically
straight in water.
This method has certain disadvantages. As the water
flows from all directions into the inlet hole at a
particular depth, the microhabitat occupied by the
plankton cannot be ascertained.
Dredging is excavation activity carried out under water. A
fishing dredge is also known as scallop dredge. Oysters,
Crabs, Sea cucumber
Methods common to both
terrestrial and aquatic habitats
The simplest form of collecting is by hand with
small vials or collecting jars. It is advisable to
carry different sizes of vials in a small bag. The
greatest advantage of this method is that one can
sample a very large number of different habitats
in a short amount of time.
Floodlights, Flashlights and
This is a novel way to capture nocturnal invertebrates.
Nearly half of all invertebrates are active at night. A
flashlight or headlamp is used to attract the insects
which are collected by hand.
Blacklight traps include a variety of trap types, but
what they all have in common is the "blacklight" or
ultraviolet light (UV) and is used for collecting many
insects that are active and flying at night and are
attracted to UV light.
Most likely invertebrates to be encountered include
noctuid moths, wolf spiders, fishing spiders, jumping
spiders, miscellaneous unusual beetles, dipterans,
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