Badarudeen,A; Dr.Sajan,K(Cochin University Of Science And Technology, March 5, 1997)
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Abstract:
As a result of the issues of care and conservation and sustainable utilisation,
the proper management of mangrove forests have become more pressing than
ever. Much recent ecological and toxicological debate has been centered around
the question of validity of making predictions about the future of mangrove ecosystemas a result of the newly evolved environmental policy. Though muchinformation exist on the biodiversity, floristic composition and characteristics, geographical distribution and uses of mangroves, systematic documentation of the various sedimentological and geochemical phenomena in relation to the mangrove flora are scarce. Hazardous, persistent, man-made chemicals and waste produces are entering the mangrove ecosystem at from the adjacent watersheds which strengthened alarming rates the indispensible need for further researches on the environmental behaviours, fate and the effect of such products. Studies on the effect of heavy metals, pesticides and the other toxic signals through bioassay and toxicity tests on mangrove species as well as in sediments definitely will furnish ample clues to establish the actual operative mechanisms of these environments. A thorough review of literature made in this angle reveals that some attempts have already been initiated the world over the record the physico-chemical characteristics of major abiotic components such as sediments and water of many mangrove ecosystem, however, adequate information is lacking in the Indian Environmental Science scenario. The present investigation is an attempt to record the sedimentological, mineralogical and geochemical characteristics of sediments as well as the heavy metal enrichment in the various species ofmangrove flora of three important mangrove ecosystems of Kerala, located at Veli (SouthKerala), Kochi (Central Kerala) and Kannur (North Kerala). The results of the above investigation have been analysed statistically, discussed based on the available literature and presented in this thesis under seven chapters
Description:
School of Marine Sciences,
Cochin University of Science and Technology
Revi Kala, S; Dr. Ramamurthy, V D(Cochin University Of Science And Technology, March 14, 1985)
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Abstract:
The present study was undertaken to observe the phytoplankton (distones,dinoflageliates,and blue green algae) blooms occurring along the south west coast of India at various seasons from February 1982 to august 1984.The centers selected for collection and observation were off Quilon, off Alleppey ,off Calicut. A total number of 25 phytoplankton blooms were studied. Characterisation of phytoplankton blooms include observing the cell counts from the day of its appearance to its day of disappearance. The appearance ,duration and locality of the blooms were also noted
Description:
School Of Marine Sciences
Cochin University Of Science And Technology
Noble,A; Dr.Silas, E G(Cochin University of Science and Technology, February , 1986)
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Abstract:
Mackerel fishery at many places in the country including Cochin
as well as at all—India level, besides its seasonal changes to
have long-term flucations apparently evincing a ten-year cycle.
Published literature on the fishery and biology of mackerel at
many places are available. But attempts on population studies
and assessment of stock are scanty. The researchers attention
at this juncture turned to investigations on population dynamics
of the mackerel .On account of the long-term Fluctuations
in the fishery, it was felt desirable to have data For a
number of years together to facilitate adequate coverage of a
unit of time in the 10-year cycle. Investigations on length weight
relationships for 16 seasons were hence carried out.
This thesis is written eection'by section embodying‘ the
results and_findings of the work carried out under different
subject areas. It contains sections on identity of the species,
information on its spatial and temporal distribution along the
Indian coast, study on length-weight relationships, growth and
age determination, population studies and stock assessment, and
discussions.This dissertation is the outcome of the works of the
candidate on the Indian mackerel. The work, however is based
on exploited resource of the inshore waters. In the course
of this analysis, lacunae existing in the investigations on
the Indian mackerel are therefore identified and presented
For future work
Saji, Susan Mathew; Dr. Chennubhotla, V S K(Cochin University of Science and Technology, January , 1991)
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Abstract:
In the present thesis , observations on the ecology of seaweed flora of Kerala, their distribution and zonation pattern, monthly/seasonal density of seaweeds at each station, frequency of occurrence, standing crop, monthly/seasonal/place-wise data on physico—chemical characters of ambient waters at the stations and their influence on seaweed density have been made. This data will help us in the farming of economically important seaweeds, by providing information on the ideal conditions of seaweed biomass production. Biochemical observations on protein, carbohydrate and lipid contents of different species of nutritive value. Seaweeds with high content of proteins, carbohydrates and lipids can be recommended for food and feed formulations after subjecting them to toxicological studies. The study on monthly/seasonal/placewise variation in biochemical composition of seaweeds will provide necessary information on the appropriate time and place of harvesting the algal species for exploiting its constituents .
Shoji, Joseph; Dr.Diwan, A D(Cochin University of Science and Technology, May , 1996)
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Abstract:
The growing demand for quality prawn seed from the farmers‘ and entrepreneurs, coupled with uncertainity of their availability from nature at the appropriate time in required quantities has prompted‘ research on problems connected with prawn seed production. Endocrine control of reproduction in the penaeid shrimp _P_. monodon has been investigated in detail by adopting a comprehensive approach to the problem. The major aspects of the study included in depth investigations of the cytological details of the reproductive and neuroendocrine organs in correlation with the process of gonadal maturation. Based on the conclusions drawn from such ultrastructural studies various endocrine manipulations were carried out to see their effects on gonadal maturation. Besides that studies on the reproductive quality of male P_. monodon and the cryopreservation of spermatophores form a part of the present investigation.
The shrimp 3; Inonodon used in the present study were collected from the offshore waters of Cochin, Madras and Mandapam and from the culture ponds of Vypeen Island near Cochin (Kerala) . The entire investigation on the cytological aspects were carried out using standard histological and electron-microscopic methods. Endocrine manipulations and cryopreservation studies is also carried out using the standard methods.
Janat Augustine, K; Dr.Chandramohanakumar, N(Cochin University of Science & Technology, September , 2002)
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Abstract:
Humic substances are complex polymeric structures.No other polymers with such a wide range of properties are so widely distributed in nature.But still their moleculer structures are unknown. A structural knowledge is essential in determining their reactivity with metals.In the present work structural elucidation of humic acids from three different mangrove ecosystems of Cochin area is done with the available data from functional group analysis and various spectroscopic methods.13C NMR spectra of the solid samples with CPMAS,IR and SEM are very promising in revealing the complex structures of these polymeric substances.Sorptional studies on the sediment and humic acid of mangrove ecosystem reveals that the major portion of the organic matter is not extractable with Sodium hydroxide and humic acid only a small portion of the total organic matter. Humic acid is a good complexing agent and scavenger. Due to the nonextractable nature of the organic matter present with the sediment left after alkali extraction it is a better scavenger.
Description:
Department of Chemical Oceanography,Cochin University of Science and Technology
Gireesh Kumar, T R; Dr.Chandramohanakumar, N(Cochin University Of Science And Technology, February , 2013)
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Abstract:
The source, fate and diagentic pathway of sedimentary organic matter in
estuaries are difficult to delineate due to the complexity of organic matter
sources, intensive physical mixing and biological processes. A combination of
bulk organic matter techniques and molecular biomarkers are found to be
successful in explaining organic matter dynamics in estuaries. The basic
requirement for these multi-proxy approaches are (i) sources have significantly
differing characteristics, (ii) there are a sufficient number of tracers to delineate
all sources and (iii) organic matter degradation and processing have little,
similar or predictable effects on end member characteristics.
Although there have been abundant researches that have attempted to
tackle difficulties related to the source and fate of organic matter in
estuarine systems, our understanding remains limited or rather inconsistent
regarding the Indian estuaries. Cochin estuary is the largest among many
extensive estuarine systems along the southwest coast of India. It supports
as much biological productivity and diversity as tropical rain forests. In this
study, we have used a combination of bulk geochemical parameters and
different group of molecular biomarkers to define organic matter sources
and thereby identifying various biogeochemical processes acting along the
salinity gradient of the Cochin estuary
Description:
Department of Chemical Oceanography
School of Marine Sciences
Cochin University of Science and Technology
Nithin, Viswambharan; Dr.Mohan Kumar, K(Cochin University of Science and Technology, April 23, 2012)
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Abstract:
This thesis entitled southern hemispheric features and their Teleconnection with indian summer monsoon.Southern hemisphere is entirely distinct from the northern hemisphere in many aspects, which is well reflected in atmospheric and oceanic properties.The thesis consists of eight chapters, in which the first chapter contains an overview of southern hemisphere. In this chapter, variability in southern hemisphere is described along with Indian summer monsoon and its teleconnection. The different types of data sets used and various methodologies adopted in the present thesis were described in Chapter 2. The period of climate shift and the magnitude of anomalies after the climate shift, which extended from troposphere to stratopause level, were investigated in detail and presented in chapter 3.
Chapter 4 depicts the recent trend and variability in southern stratosphere. The higher order variability during various months and the frequency of extremity is included in this chapter.Climatology of divergence and convergence after the documented shift is reported in chapter 5.Southern extratropical connection to Indian summer monsoon through the modulation of SAM is presented in Chapter 6.Chapter 7 deals with the modulation of SAM‐Monsoon link through North Atlantic Oscillation.
Description:
Department of Atmospheric Sciences
Cochin University of Science and Technology