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Analysing the controls over DOM quality in two contrasting sub polar marine environments

Monforte, Chiara LU (2020) In Student thesis series INES NGEK01 20201
Dept of Physical Geography and Ecosystem Science
Abstract
In this study, Dissolved Organic Matter (DOM) quality was analysed through its optical properties. Samples from the estuarine waters of the Beagle Channel and oceanic ones of the Burdwood Bank were examined in order to understand how DOM quality was changing. The focus of the study was to determine whether the environmental variables or the microbial community were the main driver in DOM composition in the two study areas. The DOM composition was different between the two locations. The majority of DOM in the ocean was composed of protein-like, autochthonous material microbially produced while the contribution from the humic-like peaks was very low. A different pattern was observed in the Beagle Channel, where the contribution from the... (More)
In this study, Dissolved Organic Matter (DOM) quality was analysed through its optical properties. Samples from the estuarine waters of the Beagle Channel and oceanic ones of the Burdwood Bank were examined in order to understand how DOM quality was changing. The focus of the study was to determine whether the environmental variables or the microbial community were the main driver in DOM composition in the two study areas. The DOM composition was different between the two locations. The majority of DOM in the ocean was composed of protein-like, autochthonous material microbially produced while the contribution from the humic-like peaks was very low. A different pattern was observed in the Beagle Channel, where the contribution from the different peaks seemed to be more equally distributed with significant amounts of humic material of terrestrial origin and high amounts of protein material as well. The organic matter in the Beagle Channel was characterised by higher amounts of chromophoric DOM, high molecular weight material and more recalcitrant DOM while in the Burdwood Bank, DOM was more labile and bioavailable. Statistical analysis showed that both the physical conditions of the water column as well as the composition of the microbial community were influencing the quality of DOM. The variable importance in projection (VIP) scores revealed that in the Burdwood Bank the microbial community had greater influence on the DOM composition while the environmental variables were the main driver in the Beagle Channel. This study allowed the characterisation of DOM in these two environments and gave better understanding of the different controls. (Less)
Please use this url to cite or link to this publication:
author
Monforte, Chiara LU
supervisor
organization
course
NGEK01 20201
year
type
M2 - Bachelor Degree
subject
keywords
DOM optical properties, Absorbance, Fluorescence, EEMs, Burdwood Bank, Beagle Channel
publication/series
Student thesis series INES
report number
504
language
English
additional info
External supervisor: Andrea Malits, CADIC-CONICET, Laboratory for Biological Oceanography
id
9013999
date added to LUP
2020-06-16 14:45:03
date last changed
2020-06-16 14:45:03
@misc{9013999,
  abstract     = {{In this study, Dissolved Organic Matter (DOM) quality was analysed through its optical properties. Samples from the estuarine waters of the Beagle Channel and oceanic ones of the Burdwood Bank were examined in order to understand how DOM quality was changing. The focus of the study was to determine whether the environmental variables or the microbial community were the main driver in DOM composition in the two study areas. The DOM composition was different between the two locations. The majority of DOM in the ocean was composed of protein-like, autochthonous material microbially produced while the contribution from the humic-like peaks was very low. A different pattern was observed in the Beagle Channel, where the contribution from the different peaks seemed to be more equally distributed with significant amounts of humic material of terrestrial origin and high amounts of protein material as well. The organic matter in the Beagle Channel was characterised by higher amounts of chromophoric DOM, high molecular weight material and more recalcitrant DOM while in the Burdwood Bank, DOM was more labile and bioavailable. Statistical analysis showed that both the physical conditions of the water column as well as the composition of the microbial community were influencing the quality of DOM. The variable importance in projection (VIP) scores revealed that in the Burdwood Bank the microbial community had greater influence on the DOM composition while the environmental variables were the main driver in the Beagle Channel. This study allowed the characterisation of DOM in these two environments and gave better understanding of the different controls.}},
  author       = {{Monforte, Chiara}},
  language     = {{eng}},
  note         = {{Student Paper}},
  series       = {{Student thesis series INES}},
  title        = {{Analysing the controls over DOM quality in two contrasting sub polar marine environments}},
  year         = {{2020}},
}