Studies on some ecological aspects of Balanus amphitrite (Cirripedia: Thoracica)
IR@NIO: CSIR-National Institute Of Oceanography, Goa
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| Contributor |
Anil, A.C.
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| Creator |
Desai, D.V.
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| Date |
2006-06-28T07:09:36Z
2006-06-28T07:09:36Z 2002 |
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| Identifier |
Ph.D. thesis, Goa University- National Institute of Oceanography, Goa, India; 176p.
http://drs.nio.org/drs/handle/2264/160 |
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| Description |
The year round breeding capability of Balanus amphitrite indicates a potential for continuous recruitment. The recruitment pattern however indicated a lull during monsoon. The study site experiences increased land run off lowering the salinity and increasing the nutrient flux. It has also been reported that the monsoon season promotes burst of phytoplankton blooms. It is possible that barnacles breeding pathway is activated by these blooms negating the other influence of monsoon in this euryhaline species. This was supported by a spike in recruitment during August ’98.The observation on gonad development reveals that this species can possess mature broods when the rostro carinal basal diameter is about 3.9 mm. The growth of Balanus amphitrite in the wild did show seasonal variations with minimal growth during monsoon season. This in turn, will influence the total recruitment potential in this area. It was observed that dislodgment and mortality peaked during late pre-monsoon and early monsoon months, opening a situation where propagule introduction will take place from a few that survive harsh conditions and those introduced from other localities. In this context the events such as break in monsoon, quantum of nutrient influx and occurrence of phytoplankton blooms will be important in the reproductive and recruitment ecology of this organism. The observations of self-fertilization in this species indicate that crowding may not be an essential requirement for successful reproduction in this species where cross-fertilization is the thumb rule.Recruitment of Balanus amphitrite is governed by events during its larval development and the cues offered by the substratum. Efforts to elucidate the role of the substratum characteristics and the cues have been made by several researchers in view of addressing antifouling issues. The larval rearing experiments indicated that larvae in the field experience a nutritional stress. However this stress did not translate proportionately to the well-fed larvae raised in the laboratory. The study also indicates that it is possible for the larvae to source their energy by feeding on organisms, which are not accounted in the chlorophyll a pool and their roles need to be quantified.
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| Language |
en
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| Title |
Studies on some ecological aspects of Balanus amphitrite (Cirripedia: Thoracica)
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Thesis
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