Sensitivity of A. islandica and M. edulis towards environmental changes: a threat to the bivalves
As a major green house gas, CO2 causes global warming which further induces changes in other climate parameters like precipitation and salinity. Additionally as about one-third of the atmospheric CO2 is absorbed by surface waters, the oceans become acidified. Bivalve shell production is costly and s...
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ftunivkiel:oai:macau.uni-kiel.de:diss_mods_00003647 2024-06-23T07:50:56+00:00 Sensitivity of A. islandica and M. edulis towards environmental changes: a threat to the bivalves an opportunity for palaeo-climatology? Sensitivität von A. islandica und M. edulis gegenüber Umweltveränderungen: Eine Gefahr für die Muscheln - eine Chance für die Paläoklimatologie? Hiebenthal, Claas Wahl, Martin Eisenhauer, Anton 2009 https://nbn-resolving.org/urn:nbn:de:gbv:8-diss-36470 https://macau.uni-kiel.de/receive/diss_mods_00003647 https://macau.uni-kiel.de/servlets/MCRFileNodeServlet/dissertation_derivate_00002753/Hiebenthal_2009.pdf eng eng https://nbn-resolving.org/urn:nbn:de:gbv:8-diss-36470 https://macau.uni-kiel.de/receive/diss_mods_00003647 https://macau.uni-kiel.de/servlets/MCRFileNodeServlet/dissertation_derivate_00002753/Hiebenthal_2009.pdf https://rightsstatements.org/page/InC/1.0/ info:eu-repo/semantics/openAccess ddc:570 thesis Mytilus edulis Arctica islandica temperature salinity ocean acidification delta44/40Ca Mg/Ca Sr/Ca lipofuscin Temperatur Salinität Ozeanversauerung Lipofuszin dissertation Text doc-type:PhDThesis 2009 ftunivkiel 2024-06-12T14:21:16Z As a major green house gas, CO2 causes global warming which further induces changes in other climate parameters like precipitation and salinity. Additionally as about one-third of the atmospheric CO2 is absorbed by surface waters, the oceans become acidified. Bivalve shell production is costly and should therefore be sensitive to environmental stress. Water pCO2, salinity and temperature changes may be factors that increase physiological stress and thus, can reduce fitness, muscle strength, shell growth, shell stability and finally the bivalves’ ecological performance. The improvement of climate models requires a better understanding of climate history. The ratios of stable Ca isotopes and of divalent substituents of Ca (e.g. Mg and Sr) in bivalve shells depend on seawater temperatures and can therefore theoretically be used as archives of past seawater climates. In two 2-factorial experimental approaches (temperature vs. salinity, temperature vs. pCO2), this work investigates the influence of water temperature, salinity and pCO2 on shell growth, mortality, condition index (Ci = soft tissue weight / shell weight), lipofuscin content in the soft tissue (by fluorometry), shell stability (with a texture analyzer), shell Mg / Ca and Sr / Ca ratios (by optical emission spectrometry) and shell Ca isotope fractionation (Δ44/40Ca, by mass spectrometry) of the two bivalve species Arctica islandica and Mytilus edulis. Additionally, in a feeding assay, we tested the defence capability of M. edulis towards predation by starfish Asterias rubens. Lipofuscin accumulation, growth rates and mortalities indicate that M. edulis is rather an estuarine than a fully marine species. Independent of the respective salinity, however, condition and growth of this species are strongly controlled by temperature. In the Baltic Sea, a positive temperature effect on shell stability will presumably be stronger than a negative salinity effect. A. islandica is a species adapted to high salinity and low temperatures. This could be shown by ... Doctoral or Postdoctoral Thesis Arctica islandica Ocean acidification MACAU: Open Access Repository of Kiel University |
institution |
Open Polar |
collection |
MACAU: Open Access Repository of Kiel University |
op_collection_id |
ftunivkiel |
language |
English |
topic |
ddc:570 thesis Mytilus edulis Arctica islandica temperature salinity ocean acidification delta44/40Ca Mg/Ca Sr/Ca lipofuscin Temperatur Salinität Ozeanversauerung Lipofuszin |
spellingShingle |
ddc:570 thesis Mytilus edulis Arctica islandica temperature salinity ocean acidification delta44/40Ca Mg/Ca Sr/Ca lipofuscin Temperatur Salinität Ozeanversauerung Lipofuszin Hiebenthal, Claas Sensitivity of A. islandica and M. edulis towards environmental changes: a threat to the bivalves |
topic_facet |
ddc:570 thesis Mytilus edulis Arctica islandica temperature salinity ocean acidification delta44/40Ca Mg/Ca Sr/Ca lipofuscin Temperatur Salinität Ozeanversauerung Lipofuszin |
description |
As a major green house gas, CO2 causes global warming which further induces changes in other climate parameters like precipitation and salinity. Additionally as about one-third of the atmospheric CO2 is absorbed by surface waters, the oceans become acidified. Bivalve shell production is costly and should therefore be sensitive to environmental stress. Water pCO2, salinity and temperature changes may be factors that increase physiological stress and thus, can reduce fitness, muscle strength, shell growth, shell stability and finally the bivalves’ ecological performance. The improvement of climate models requires a better understanding of climate history. The ratios of stable Ca isotopes and of divalent substituents of Ca (e.g. Mg and Sr) in bivalve shells depend on seawater temperatures and can therefore theoretically be used as archives of past seawater climates. In two 2-factorial experimental approaches (temperature vs. salinity, temperature vs. pCO2), this work investigates the influence of water temperature, salinity and pCO2 on shell growth, mortality, condition index (Ci = soft tissue weight / shell weight), lipofuscin content in the soft tissue (by fluorometry), shell stability (with a texture analyzer), shell Mg / Ca and Sr / Ca ratios (by optical emission spectrometry) and shell Ca isotope fractionation (Δ44/40Ca, by mass spectrometry) of the two bivalve species Arctica islandica and Mytilus edulis. Additionally, in a feeding assay, we tested the defence capability of M. edulis towards predation by starfish Asterias rubens. Lipofuscin accumulation, growth rates and mortalities indicate that M. edulis is rather an estuarine than a fully marine species. Independent of the respective salinity, however, condition and growth of this species are strongly controlled by temperature. In the Baltic Sea, a positive temperature effect on shell stability will presumably be stronger than a negative salinity effect. A. islandica is a species adapted to high salinity and low temperatures. This could be shown by ... |
author2 |
Wahl, Martin Eisenhauer, Anton |
format |
Doctoral or Postdoctoral Thesis |
author |
Hiebenthal, Claas |
author_facet |
Hiebenthal, Claas |
author_sort |
Hiebenthal, Claas |
title |
Sensitivity of A. islandica and M. edulis towards environmental changes: a threat to the bivalves |
title_short |
Sensitivity of A. islandica and M. edulis towards environmental changes: a threat to the bivalves |
title_full |
Sensitivity of A. islandica and M. edulis towards environmental changes: a threat to the bivalves |
title_fullStr |
Sensitivity of A. islandica and M. edulis towards environmental changes: a threat to the bivalves |
title_full_unstemmed |
Sensitivity of A. islandica and M. edulis towards environmental changes: a threat to the bivalves |
title_sort |
sensitivity of a. islandica and m. edulis towards environmental changes: a threat to the bivalves |
publishDate |
2009 |
url |
https://nbn-resolving.org/urn:nbn:de:gbv:8-diss-36470 https://macau.uni-kiel.de/receive/diss_mods_00003647 https://macau.uni-kiel.de/servlets/MCRFileNodeServlet/dissertation_derivate_00002753/Hiebenthal_2009.pdf |
genre |
Arctica islandica Ocean acidification |
genre_facet |
Arctica islandica Ocean acidification |
op_relation |
https://nbn-resolving.org/urn:nbn:de:gbv:8-diss-36470 https://macau.uni-kiel.de/receive/diss_mods_00003647 https://macau.uni-kiel.de/servlets/MCRFileNodeServlet/dissertation_derivate_00002753/Hiebenthal_2009.pdf |
op_rights |
https://rightsstatements.org/page/InC/1.0/ info:eu-repo/semantics/openAccess |
_version_ |
1802641888699744256 |