Impact of climate change and contamination in the oxidative stress response of marine organismss
Tese de doutoramento, Ciências do Mar, Universidade de Lisboa, Faculdade de Ciências, 2018 Atmospheric carbon dioxide (CO2) levels are increasing at an unprecedented rate, changing the carbonate chemistry (in a process known as ocean acidification) and temperature of the worlds ocean. Moreover, the...
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ftunivlisboa:oai:repositorio.ul.pt:10451/36936 2023-05-15T17:50:47+02:00 Impact of climate change and contamination in the oxidative stress response of marine organismss Lopes, Ana Rita José Rosa, Rui Afonso Bairrão da, 1976- Diniz, Mário Emanuel Campos de Sousa 2019-02-12T12:42:05Z http://hdl.handle.net/10451/36936 eng eng http://hdl.handle.net/10451/36936 101504721 openAccess Teses de doutoramento - 2018 Domínio/Área Científica::Ciências Naturais::Ciências Biológicas doctoralThesis 2019 ftunivlisboa 2022-05-25T18:39:16Z Tese de doutoramento, Ciências do Mar, Universidade de Lisboa, Faculdade de Ciências, 2018 Atmospheric carbon dioxide (CO2) levels are increasing at an unprecedented rate, changing the carbonate chemistry (in a process known as ocean acidification) and temperature of the worlds ocean. Moreover, the simultaneous occurrence of highly toxic and persistent contaminants, such as mercury, will play a key role in further shaping the ecophysiology of marine organisms. Thus, the main goal of the present dissertation was to undertake the first comprehensive and comparative analysis of the biochemical strategies, namely antioxidant defense (both enzymatic and non-enzymatic antioxidants) and protein repair and removal mechanisms, of several marine organisms – from invertebrate (Veretillum cynomorium and Gammarus locusta) to vertebrate species (Argyrosomus regius, Chiloscyllium plagiosum and Scyliorhinus canicula) – encompassing different life-stages and life-strategies to the predicted climate-mediated changes. The findings provided in the present dissertation proved that organisms’ responses were mostly underpinned by temperature (increasing lipid, protein and nucleic acid damage), that also culminated into increased mercury bioaccumulation and toxicity, while ocean acidification as a sole stressor usually played a minor role in defining species vulnerability (i.e. responsible for increased oxidative damage in the marine calcifying organisms G. locusta). Nonetheless when co-occurring with warming and contamination scenarios, acidification was usually responsible for the reduction of heavy metal accumulation and toxicity, as well as decreased warming and contamination-elicited oxidative stress. Additionally, organisms’ responses were species-specific, and organisms that usually occupy more variable environments (e.g. daily changes in abiotic conditions) usually displayed greater responses towards environmental change than organisms inhabiting more stable environments. Furthermore, and assuming the relevance of ... Doctoral or Postdoctoral Thesis Ocean acidification Universidade de Lisboa: repositório.UL Canicula ENVELOPE(-58.515,-58.515,-63.717,-63.717) |
institution |
Open Polar |
collection |
Universidade de Lisboa: repositório.UL |
op_collection_id |
ftunivlisboa |
language |
English |
topic |
Teses de doutoramento - 2018 Domínio/Área Científica::Ciências Naturais::Ciências Biológicas |
spellingShingle |
Teses de doutoramento - 2018 Domínio/Área Científica::Ciências Naturais::Ciências Biológicas Lopes, Ana Rita José Impact of climate change and contamination in the oxidative stress response of marine organismss |
topic_facet |
Teses de doutoramento - 2018 Domínio/Área Científica::Ciências Naturais::Ciências Biológicas |
description |
Tese de doutoramento, Ciências do Mar, Universidade de Lisboa, Faculdade de Ciências, 2018 Atmospheric carbon dioxide (CO2) levels are increasing at an unprecedented rate, changing the carbonate chemistry (in a process known as ocean acidification) and temperature of the worlds ocean. Moreover, the simultaneous occurrence of highly toxic and persistent contaminants, such as mercury, will play a key role in further shaping the ecophysiology of marine organisms. Thus, the main goal of the present dissertation was to undertake the first comprehensive and comparative analysis of the biochemical strategies, namely antioxidant defense (both enzymatic and non-enzymatic antioxidants) and protein repair and removal mechanisms, of several marine organisms – from invertebrate (Veretillum cynomorium and Gammarus locusta) to vertebrate species (Argyrosomus regius, Chiloscyllium plagiosum and Scyliorhinus canicula) – encompassing different life-stages and life-strategies to the predicted climate-mediated changes. The findings provided in the present dissertation proved that organisms’ responses were mostly underpinned by temperature (increasing lipid, protein and nucleic acid damage), that also culminated into increased mercury bioaccumulation and toxicity, while ocean acidification as a sole stressor usually played a minor role in defining species vulnerability (i.e. responsible for increased oxidative damage in the marine calcifying organisms G. locusta). Nonetheless when co-occurring with warming and contamination scenarios, acidification was usually responsible for the reduction of heavy metal accumulation and toxicity, as well as decreased warming and contamination-elicited oxidative stress. Additionally, organisms’ responses were species-specific, and organisms that usually occupy more variable environments (e.g. daily changes in abiotic conditions) usually displayed greater responses towards environmental change than organisms inhabiting more stable environments. Furthermore, and assuming the relevance of ... |
author2 |
Rosa, Rui Afonso Bairrão da, 1976- Diniz, Mário Emanuel Campos de Sousa |
format |
Doctoral or Postdoctoral Thesis |
author |
Lopes, Ana Rita José |
author_facet |
Lopes, Ana Rita José |
author_sort |
Lopes, Ana Rita José |
title |
Impact of climate change and contamination in the oxidative stress response of marine organismss |
title_short |
Impact of climate change and contamination in the oxidative stress response of marine organismss |
title_full |
Impact of climate change and contamination in the oxidative stress response of marine organismss |
title_fullStr |
Impact of climate change and contamination in the oxidative stress response of marine organismss |
title_full_unstemmed |
Impact of climate change and contamination in the oxidative stress response of marine organismss |
title_sort |
impact of climate change and contamination in the oxidative stress response of marine organismss |
publishDate |
2019 |
url |
http://hdl.handle.net/10451/36936 |
long_lat |
ENVELOPE(-58.515,-58.515,-63.717,-63.717) |
geographic |
Canicula |
geographic_facet |
Canicula |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
http://hdl.handle.net/10451/36936 101504721 |
op_rights |
openAccess |
_version_ |
1766157681834328064 |