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NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR) >
NISCAIR PUBLICATIONS >
Research Journals >
Indian Journal of Geo-Marine Sciences (IJMS) >
IJMS Vol.41 [2012] >
IJMS Vol.41(5) [October 2012] >
| Title: | Imposex in Babylonia spirata (Gastropoda: Babyloniidae) from Pakistan (Northern Arabian Sea) |
| Authors: | Afsar, Nuzhat
Siddiqui, Ghazala
Ayub, Zarrien |
| Keywords: | Ovo-testis
Babylonia spirata
Organotin
Karachi |
| Issue Date: | Oct-2012 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | This is the first report of the occurrence
of imposex in the neogastropod Babylonia
spirata (Linnaeus, 1758) from Pakistani waters. Studies were carried out at
Manora Channel, which is situated in the vicinity of Karachi
port and fish harbor, the hub of commercial boating activity in Pakistan. Other
two sites Buleji and Sonmiani are free of such activity and were therefore
considered as reference sites. Specimens of B.
spirata were morphologically and histologically examined. Specimens showing
imposex were only found at Manora Channel. Incidence of imposex was 73.7% and
the vas deferens sequence (VDS) were ranked to be between 1 to 4+. The average
VDSI was 0.42 whereas the average relative penis length index (RPLI) was 14.45
and the relative penis size index (RPSI) was 0.32. Both normal and imposex females
generally showed normal gonadal development. However, evidence of an ovo-testis
was found in histological sections of normal and imposexed female of B. spirata gonads examined from Manora
Channel. At Manora Channel the sex ratio was significantly in favour of females
whereas at Buleji and Sonmiani, it was close to unity (1:1). |
| Page(s): | 418-424 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-1033 (Online); 0379-5136 (Print) |
| Source: | IJMS Vol.41(5) [October 2012]
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