The large oocyte sizes observed (200-300 μm) suggest a lecithotrophic larval development.īenthic biological and biogeochemical patterns and processes across an oxygen minimum zone ( Pakistan margin, NE Arabian Sea) The gonad wall consisted of reticular tissue that might be used for nutrient storage or as an irrigation system.
All specimens had a penis and sperm groove. Basic reproductive aspects were analysed. This suggests a unimodal size structure with evidence of a marked recruitment event. The populations from the Oman and Pakistan OMZs were dominated by juveniles. Multiple regression with oxygen concentration and depth indicates that depth (and its related variables) is the main factor explaining the variation in abundance of T. Similarly dense populations were not observed in the Pakistan OMZ. Numbers dropped rapidly below 450 m, to zero below 500 m depth. The highest abundance of adult specimens in the Oman OMZ was found between 300 and 450 m. This species has been found in large numbers in the upper oxygen minimum zone (OMZ) of the Oman margin, and has also been collected from the OMZ of the Pakistan margin. The present study describes some aspects of the distribution and biology of Tibia delicatula (Nevill), a gastropod belonging to the family Strombidae. Aspects of the distribution, population structure and reproduction of the gastropod Tibia delicatula (Nevill, 1881) inhabiting the oxygen minimum zone of the Oman and Pakistan continental margins
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