73
24 species with the adjoining station II and only
eight species with the remote station V. Similarly
station II shares 20 species with the next station
III but only eight with remote station V.
Unlike the raw fi gures of shared species
quoted above, the similarity indices take account
of the total number of species in the regions
concerned. The Jaccard index that is used here
incorporates total from both of the regions
compared. Nonetheless, the index presents a
broadly similar picture of faunal resemblance to
the shared species and points that the greatest
levels of species sharing and family sharing occur
between regions that are geographically close
together and the smallest levels between regions
that are far apart. In other words, whether one
uses the numbers of shared species or the Jaccard
index, the conclusions on the rotifer faunal similarities are broadly similar (Table 6.7 ).
Species Diversity
Stations I, II, and III showed reasonably good
rotifer species diversity, whereas stations IV and
V had lower diversity of rotifers. On the whole,
however, the post-monsoon season had the highest diversity of rotifers as indicated by the
Shannon-Weiner and Margalef indices (Table 6.8 )
Table 6.3 Composition of rotifer species at station II
Family (14)
b
Genera (19)
Species (33)
Asplanchnidae
Asplanchna
A. brightwelli
a
Atrochidae
Cupelopagis
C. vorax
a
Brachionidae
Anuraeopsis
A. coelata
A. fi ssa
Brachionus
B. angularis
B. bidentatus
B. calycifl orus
B. caudatus
B. forfi cula
B. quadridentatus
Keratella
K. procurva
K. tropica
Plationus
P. patulus
Colurellidae
Colurella
C. obtuse
Lepadella
L. patella
Dicranophoridae Dicranophorous D. australiensis
Euchlanidae
Euchlanis
E. meneta
Filiniidae
Filinia
F. longiseta
F. opoliensis
Flosculariidae
Lacinularia
Sp.1
Hexarthridae
Hexarthra
H. mira
Lecanidae
Lecane
L. arcula
L. bulla
L. inermis
L. leontina
L. luna
L. papuana
L. quadridentata
Mytilinidae
Mytilina
M. ventralis
Notommatidae
Cephalodella
C. misgurnus
Scaridium
S. longicaudum
Synchaetidae
Polyarthra
Sp.1
Philodinidae
Rotaria
R. neptunia
a
a
Indicates exclusive species
b
Total number in parenthesis
Table 6.4 Composition of rotifer species at station IV
Family (7)
a
Genera (10)
Species (12)
Brachionidae
Anuraeopsis
A. fi ssa
Brachionus
B. angularis
B. quadridentatus
Keratella
K. tropica
Plationus
P. patulus
Colurellidae
Colurella
C. obtuse
Dicranophoridae Dicranophorus D. australiensis
Filiniidae
Filinia
F. longiseta
Lecanidae
Lecane
L. bulla
L. inermis
Synchaetidae
Polyarthra
Sp.1
Trichocercidae
Trichocerca
T. braziliensis
a
Total number in parenthesis
Table 6.5 Composition of rotifer species at station V
Family (5)
a
Genera (6)
Species (10)
Brachionidae
Brachionus
B. angularis
B. quadridentatus
Keratella
K. tropica
Colurellidae
Lepadella
L. acuminate
L. patella
Dicranophoridae Dicranophorus D. australiensis
Filiniidae
Filinia
F. longiseta
Lecanidae
Lecane
L. bulla
L. inermis
L. pyriformis
a
Total number in parenthesis
6 Structure and Dynamics of Rotifer
24 species with the adjoining station II and only
eight species with the remote station V. Similarly
station II shares 20 species with the next station
III but only eight with remote station V.
Unlike the raw fi gures of shared species
quoted above, the similarity indices take account
of the total number of species in the regions
concerned. The Jaccard index that is used here
incorporates total from both of the regions
compared. Nonetheless, the index presents a
broadly similar picture of faunal resemblance to
the shared species and points that the greatest
levels of species sharing and family sharing occur
between regions that are geographically close
together and the smallest levels between regions
that are far apart. In other words, whether one
uses the numbers of shared species or the Jaccard
index, the conclusions on the rotifer faunal similarities are broadly similar (Table 6.7 ).
Species Diversity
Stations I, II, and III showed reasonably good
rotifer species diversity, whereas stations IV and
V had lower diversity of rotifers. On the whole,
however, the post-monsoon season had the highest diversity of rotifers as indicated by the
Shannon-Weiner and Margalef indices (Table 6.8 )
Table 6.3 Composition of rotifer species at station II
Family (14)
b
Genera (19)
Species (33)
Asplanchnidae
Asplanchna
A. brightwelli
a
Atrochidae
Cupelopagis
C. vorax
a
Brachionidae
Anuraeopsis
A. coelata
A. fi ssa
Brachionus
B. angularis
B. bidentatus
B. calycifl orus
B. caudatus
B. forfi cula
B. quadridentatus
Keratella
K. procurva
K. tropica
Plationus
P. patulus
Colurellidae
Colurella
C. obtuse
Lepadella
L. patella
Dicranophoridae Dicranophorous D. australiensis
Euchlanidae
Euchlanis
E. meneta
Filiniidae
Filinia
F. longiseta
F. opoliensis
Flosculariidae
Lacinularia
Sp.1
Hexarthridae
Hexarthra
H. mira
Lecanidae
Lecane
L. arcula
L. bulla
L. inermis
L. leontina
L. luna
L. papuana
L. quadridentata
Mytilinidae
Mytilina
M. ventralis
Notommatidae
Cephalodella
C. misgurnus
Scaridium
S. longicaudum
Synchaetidae
Polyarthra
Sp.1
Philodinidae
Rotaria
R. neptunia
a
a
Indicates exclusive species
b
Total number in parenthesis
Table 6.4 Composition of rotifer species at station IV
Family (7)
a
Genera (10)
Species (12)
Brachionidae
Anuraeopsis
A. fi ssa
Brachionus
B. angularis
B. quadridentatus
Keratella
K. tropica
Plationus
P. patulus
Colurellidae
Colurella
C. obtuse
Dicranophoridae Dicranophorus D. australiensis
Filiniidae
Filinia
F. longiseta
Lecanidae
Lecane
L. bulla
L. inermis
Synchaetidae
Polyarthra
Sp.1
Trichocercidae
Trichocerca
T. braziliensis
a
Total number in parenthesis
Table 6.5 Composition of rotifer species at station V
Family (5)
a
Genera (6)
Species (10)
Brachionidae
Brachionus
B. angularis
B. quadridentatus
Keratella
K. tropica
Colurellidae
Lepadella
L. acuminate
L. patella
Dicranophoridae Dicranophorus D. australiensis
Filiniidae
Filinia
F. longiseta
Lecanidae
Lecane
L. bulla
L. inermis
L. pyriformis
a
Total number in parenthesis
6 Structure and Dynamics of Rotifer