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Fauna stratification on the Forest Floor of Eucalyptus Grove
Zvi Sever
Biology Dep., University of Indianapolis, U.S.A
SEV@NETVISION.NET.IL
(Presented: Zoological Society of Israel's conference 2012)
In order to obtain data on the invertebrates inhabiting the forest floor of a eucalyptus
grove, I sectioned off a 1000 sq.m. populated by Red River Gum trees (Eucalyptus
camaldulensis) in Hakfar Hayarok. Monthly samples were taken over a ten-month
period, composed of three 20x20 cm of leaves and soil that had been filtered through
nets (4x4 cm to 3x3 mm). The ground was filtered to a depth of 20 cm, from four
layers: 0-5, 5-10, 10-15, 15-20 cm deep. Pitfall traps were placed twice monthly.
A total of 201 specimens were caught. Accordingly, 33 species were found on the
ground surface: 2 land crabs, 3 centipedes, 11 spiders, and 17 species of insects. The
20X20X20 cm volume of filtered soil produced 38 species: 1 worm, 2 land crabs, 2
centipedes,3 snails, 5 spiders, and 25 species of insects. The layers of leaves and soil
contained more insects than other species.
A total of 130 specimens were extracted from the ground layers. Examining the
number of organisms, there is similarity in the distribution pattern between the first
layer (5 cm depth) and the second layer (5 - 10 cm). Still it was noted that more
individuals were present in the first layer.
In the third layer (10 - 15 cm), invertebrates were seen in the spring and early
summer, although quantitatively less there than in the upper layers. (3 specimens per
sample as compared to between 5 and 12 specimens, respectively).
The model of the fourth layer (15 - 20 cm) is similar to the one above it, though larger
quantities of organisms were observed in the autumn. Only here organisms were
found during the autumn, usually the larvae of insects.
In late summer no organisms over the size of 3 mm were found in all the soil layers.
It would be worthy to carry out further investigations by filtering the forest floor of
other species of eucalyptus.

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Sever-Fauna stratification on the Forest Floor of Eucalyptus Grove-2012

  • 1. Fauna stratification on the Forest Floor of Eucalyptus Grove Zvi Sever Biology Dep., University of Indianapolis, U.S.A SEV@NETVISION.NET.IL (Presented: Zoological Society of Israel's conference 2012) In order to obtain data on the invertebrates inhabiting the forest floor of a eucalyptus grove, I sectioned off a 1000 sq.m. populated by Red River Gum trees (Eucalyptus camaldulensis) in Hakfar Hayarok. Monthly samples were taken over a ten-month period, composed of three 20x20 cm of leaves and soil that had been filtered through nets (4x4 cm to 3x3 mm). The ground was filtered to a depth of 20 cm, from four layers: 0-5, 5-10, 10-15, 15-20 cm deep. Pitfall traps were placed twice monthly. A total of 201 specimens were caught. Accordingly, 33 species were found on the ground surface: 2 land crabs, 3 centipedes, 11 spiders, and 17 species of insects. The 20X20X20 cm volume of filtered soil produced 38 species: 1 worm, 2 land crabs, 2 centipedes,3 snails, 5 spiders, and 25 species of insects. The layers of leaves and soil contained more insects than other species. A total of 130 specimens were extracted from the ground layers. Examining the number of organisms, there is similarity in the distribution pattern between the first layer (5 cm depth) and the second layer (5 - 10 cm). Still it was noted that more individuals were present in the first layer. In the third layer (10 - 15 cm), invertebrates were seen in the spring and early summer, although quantitatively less there than in the upper layers. (3 specimens per sample as compared to between 5 and 12 specimens, respectively). The model of the fourth layer (15 - 20 cm) is similar to the one above it, though larger quantities of organisms were observed in the autumn. Only here organisms were found during the autumn, usually the larvae of insects. In late summer no organisms over the size of 3 mm were found in all the soil layers. It would be worthy to carry out further investigations by filtering the forest floor of other species of eucalyptus.