Environmental Engineering Reference
In-Depth Information
38 species, followed by Coenagrionidae (12 species)
and Aeshnidae (8 species). The family Libellulidae
was the dominant in terms of species richness
(52.77 %) followed by Coenagrionidae (16.66 %)
and Aeshnidae (11.11 %). According to the IUCN
status, the
Libellago balus
listed as endangered,
Libellago andamanensis
as vulnerable and
Indothemis carnatica
as near threatened.
Simpson Index (
λ
) was highest at Indira Point and
Lakshman Beach (0.18) followed by Kopen
heat (0.17) and B-quarry (0.16) (Table
10.3
).
Distribution of Odonates in Ritchie's
Archipelago
Species of odonates recorded in different location
during the period of study is given in Table
10.4
.
Species Diversity Indices of Odonates
in Ritchie's Archipelago
Species diversity index (
H
Distribution of Odonates in Great
Nicobar Island
) was highest in
Havelock (3.08) and lowest at Middle Button
(0.69) (Table
10.5
).
A total of 72 species of odonates under nine
families and 38 genera were recorded in Andaman
and Nicobar Islands. The occurrence of at least
72 species of odonates on the Andaman and
Nicobar Islands suggests an excellent species
richness, which likely refl ects the wide variety of
aquatic and terrestrial habitats on the forests.
Many streams and ponds, often found to be with
abundant shoreline vegetation, provide the
′
Species of odonates recorded in different location
during the period of study is given in Table
10.2
.
Out of 20 species,
Orthetrum sabina sabina,
Lathercista asiatica asiatica, Agriocnemis pyg-
maea
and
Diplocodes trivialis
were recorded in
all the sites.
Diversity Indices in Different Locations
Species diversity index (
H
) was highest in
Gingen Basti (2.66) and lowest at B-quarry (1.67).
′
Table 10.2
Distribution of the odonates in different locations in Great Nicobar Island
Sl. No.
Species name
1
2
3
4
5
6
7
8
9
10
11
1.
Gycantha dravida
(Lieftinck)
√
√
√
√
2.
Orthetrum sabina sabina
(Drury)
√
√
√
√
√
√
√
√
√
√
√
3.
Rhyothemis variegate variegate
(Linnaeus)
√
√
√
√
√
√
4.
Brachythemis
sp.
√
√
√
√
√
5.
Lathrecista asiatica asiatica
(Fabricius)
√
√
√
√
√
√
√
√
√
√
√
6.
Trithemis pallidinervis
(Kirby)
√
√
√
√
√
7.
Pantala fl avescens
(Fabricius)
√
√
√
8.
Ischnura senegalensis
(Rambur)
√
√
√
√
√
9.
Neurothemis fl uctuans
(Fabricius)
√
√
√
√
√
10.
Neurothemis intermedia intermedia
(Rambur)
√
√
√
√
√
11.
Neurothemis fulvia
(Drury)
√
√
√
12.
Vestalis gracilis
(Rambur)
√
√
13.
Agriocnemis femina oryzae
(Lieftinck)
√
√
√
√
√
14.
Diplocodes trivialis
(Rambur)
√
√
√
√
√
√
√
√
√
√
√
15.
Brachythemis contaminata
(Fabricius)
√
√
√
√
√
√
√
√
16.
Orthetrum pruinosum neglectum
(Rambur)
17.
Trithemis festiva
(Rambur)
√
√
√
√
18.
Rhyothemis phyllis phyllis
(Sulzer)
√
√
√
19.
Agriocnemis pygmaea
(Rambur)
√
√
√
√
√
√
√
√
√
√
√
20.
Acisoma panorpoides panorpoides
(Rambur)
√
√
√
1
Amphibian road,
2
B-quarry,
3
Gingen Basti,
4
Gandhi Nagar,
5
East-west road,
6
Indira Point,
7
Lakshman Beach,
8
Mahar Nala,
9
Navidera,
10
Kopen heat,
11
Kondul
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