Carbonate chemistry and coral reefs in the Pacific coast of Costa Rica
Coral reefs are important tropical ecosystems holding about 25% of the world marine biodiversity. Their tridimensional biogenic structures are built of calcium carbonate and they are threatened by global warming and ocean acidification. Current projections on the future development of coral reefs su...
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Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky
2019
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ftsubhamburg:oai:ediss.sub.uni-hamburg.de:ediss/6157 2023-05-15T17:51:59+02:00 Carbonate chemistry and coral reefs in the Pacific coast of Costa Rica Karbonatchemie und Korallenriffe an der Pazifikküste Costa Ricas Sánchez Noguera, Celeste Emeis, Kay-Christian (Prof. Dr.) 2019-01-01 http://nbn-resolving.de/urn:nbn:de:gbv:18-102309 https://ediss.sub.uni-hamburg.de/handle/ediss/6157 eng eng Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky http://nbn-resolving.de/urn:nbn:de:gbv:18-102309 https://ediss.sub.uni-hamburg.de/handle/ediss/6157 http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess No license 550 Geowissenschaften 38.99 Geowissenschaften: Sonstiges ddc:550 doctoralThesis doc-type:doctoralThesis 2019 ftsubhamburg 2022-11-09T07:11:12Z Coral reefs are important tropical ecosystems holding about 25% of the world marine biodiversity. Their tridimensional biogenic structures are built of calcium carbonate and they are threatened by global warming and ocean acidification. Current projections on the future development of coral reefs suffer among others from the scarcity of local observations, especially along the Costa Rican coast in the Eastern Tropical Pacific (ETP). The aim of this thesis was to investigate the carbonate chemistry in coastal waters and their effect on the reef development along this coast. It reveals a strong gradient from reefs influenced by upwelling in the north towards reefs affected by river discharges in the south. Due to this gradient we selected three study sites: Santa Elena in the north, Marino Ballena in the south and Matapalo between these two sites. Parameters required to determine the carbonate system (pH, pCO2, TA and DIC) including temperature, salinity and nutrients were measured during the dry and rainy season. Furthermore, the benthic composition was quantified by reef surveys and in situ studies were carried out to identify the effect of local environmental variables on reef organisms. Our results evidenced that coastal upwelling and metabolic reactions (photosynthesis and respiration) are the main drivers in the north (Santa Elena), whereas calcification and carbonate dissolution in addition to river discharges exert a strong control on the carbonate chemistry in the south (Marino Ballena). The dominant coral species in the south (Porites lobata and Pavona clavus) cope with enhanced suspended matter concentrations, a low salinity, and a low aragonite saturation state (Ωa). Reef-builders in the north (Pavona gigantea, Pavona clavus and Pocillopora sp.) are also tolerant to low Ωa but are adapted to low sea water temperatures and euthrophic conditions. However, enhanced nutrient inputs into reefs enhance productivity, which in turn favors the growth of larger and more effective benthic bioeroders. In addition ... Doctoral or Postdoctoral Thesis Ocean acidification ediss.sub.hamburg (Staats- und Universitätsbibliothek Hamburg, Carl von Ossietzky) Pacific |
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Open Polar |
collection |
ediss.sub.hamburg (Staats- und Universitätsbibliothek Hamburg, Carl von Ossietzky) |
op_collection_id |
ftsubhamburg |
language |
English |
topic |
550 Geowissenschaften 38.99 Geowissenschaften: Sonstiges ddc:550 |
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550 Geowissenschaften 38.99 Geowissenschaften: Sonstiges ddc:550 Sánchez Noguera, Celeste Carbonate chemistry and coral reefs in the Pacific coast of Costa Rica |
topic_facet |
550 Geowissenschaften 38.99 Geowissenschaften: Sonstiges ddc:550 |
description |
Coral reefs are important tropical ecosystems holding about 25% of the world marine biodiversity. Their tridimensional biogenic structures are built of calcium carbonate and they are threatened by global warming and ocean acidification. Current projections on the future development of coral reefs suffer among others from the scarcity of local observations, especially along the Costa Rican coast in the Eastern Tropical Pacific (ETP). The aim of this thesis was to investigate the carbonate chemistry in coastal waters and their effect on the reef development along this coast. It reveals a strong gradient from reefs influenced by upwelling in the north towards reefs affected by river discharges in the south. Due to this gradient we selected three study sites: Santa Elena in the north, Marino Ballena in the south and Matapalo between these two sites. Parameters required to determine the carbonate system (pH, pCO2, TA and DIC) including temperature, salinity and nutrients were measured during the dry and rainy season. Furthermore, the benthic composition was quantified by reef surveys and in situ studies were carried out to identify the effect of local environmental variables on reef organisms. Our results evidenced that coastal upwelling and metabolic reactions (photosynthesis and respiration) are the main drivers in the north (Santa Elena), whereas calcification and carbonate dissolution in addition to river discharges exert a strong control on the carbonate chemistry in the south (Marino Ballena). The dominant coral species in the south (Porites lobata and Pavona clavus) cope with enhanced suspended matter concentrations, a low salinity, and a low aragonite saturation state (Ωa). Reef-builders in the north (Pavona gigantea, Pavona clavus and Pocillopora sp.) are also tolerant to low Ωa but are adapted to low sea water temperatures and euthrophic conditions. However, enhanced nutrient inputs into reefs enhance productivity, which in turn favors the growth of larger and more effective benthic bioeroders. In addition ... |
author2 |
Emeis, Kay-Christian (Prof. Dr.) |
format |
Doctoral or Postdoctoral Thesis |
author |
Sánchez Noguera, Celeste |
author_facet |
Sánchez Noguera, Celeste |
author_sort |
Sánchez Noguera, Celeste |
title |
Carbonate chemistry and coral reefs in the Pacific coast of Costa Rica |
title_short |
Carbonate chemistry and coral reefs in the Pacific coast of Costa Rica |
title_full |
Carbonate chemistry and coral reefs in the Pacific coast of Costa Rica |
title_fullStr |
Carbonate chemistry and coral reefs in the Pacific coast of Costa Rica |
title_full_unstemmed |
Carbonate chemistry and coral reefs in the Pacific coast of Costa Rica |
title_sort |
carbonate chemistry and coral reefs in the pacific coast of costa rica |
publisher |
Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky |
publishDate |
2019 |
url |
http://nbn-resolving.de/urn:nbn:de:gbv:18-102309 https://ediss.sub.uni-hamburg.de/handle/ediss/6157 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
http://nbn-resolving.de/urn:nbn:de:gbv:18-102309 https://ediss.sub.uni-hamburg.de/handle/ediss/6157 |
op_rights |
http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess No license |
_version_ |
1766159291506491392 |