Increased temperature causes different carbon and nitrogen processing patterns in two common intertidal foraminifera (<i>Ammonia tepida</i> and <i>Haynesina germanica</i>)
Benthic foraminifera are highly abundant heterotrophic protists in marine sediments, but future environmental changes will challenge the tolerance limits of intertidal species. Metabolic rates and physiological processes in foraminifera are strongly dependent on environmental temperatures. Tempe...
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2017-06-01
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| Series: | Biogeosciences |
| Online Access: | http://www.biogeosciences.net/14/2815/2017/bg-14-2815-2017.pdf |
| _version_ | 1828346036004847616 |
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| author | J. Wukovits A. J. Enge W. Wanek M. Watzka P. Heinz |
| author_facet | J. Wukovits A. J. Enge W. Wanek M. Watzka P. Heinz |
| author_sort | J. Wukovits |
| collection | DOAJ |
| description | Benthic foraminifera are highly abundant heterotrophic protists in
marine sediments, but future environmental changes will challenge the
tolerance limits of intertidal species. Metabolic rates and physiological
processes in foraminifera are strongly dependent on environmental
temperatures. Temperature-related stress could therefore impact foraminiferal
food source processing efficiency and might result in altered nutrient fluxes
through the intertidal food web. In this study, we performed a laboratory
feeding experiment on <i>Ammonia tepida</i> and <i>Haynesina
germanica</i>, two dominant foraminiferal species of the German Wadden
Sea/Friedrichskoog, to test the effect of temperature on phytodetritus
retention. The specimens were fed with <sup>13</sup>C and <sup>15</sup>N labelled freeze-dried <i>Dunaliella tertiolecta</i> (green algae) at the start of the
experiment and were incubated at 20, 25 and 30 °C respectively.
Dual labelling was applied to observe potential temperature effects on the
relation of phytodetrital carbon and nitrogen retention. Samples were taken
over a period of 2 weeks. Foraminiferal cytoplasm was isotopically analysed
to investigate differences in carbon and nitrogen uptake derived from the
food source. Both species showed a positive response to the provided food
source, but carbon uptake rates of <i>A. tepida</i> were 10-fold higher
compared to those of <i>H. germanica</i>. Increased temperatures had a far
stronger impact on the carbon uptake of <i>H. germanica</i> than on <i>A.
tepida</i>. A distinct increase in the levels of phytodetrital-derived nitrogen
(compared to more steady carbon levels) could be observed over the course of
the experiment in both species. The results suggest that higher temperatures
have a significant negative effect on the carbon exploitation of <i>H.
germanica</i>. For <i>A. tepida</i>, higher carbon uptake rates and the
enhanced tolerance range for higher temperatures could outline an advantage
in warmer periods if the main food source consists of chlorophyte
phytodetritus. These conditions are likely to impact nutrient fluxes in
<i>A. tepida</i>/<i>H. germanica</i> associations. |
| first_indexed | 2024-04-14T00:21:13Z |
| format | Article |
| id | doaj.art-d4e0931e1b2a45b58a3ba4a371e2dc89 |
| institution | Directory Open Access Journal |
| issn | 1726-4170 1726-4189 |
| language | English |
| last_indexed | 2024-04-14T00:21:13Z |
| publishDate | 2017-06-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Biogeosciences |
| spelling | doaj.art-d4e0931e1b2a45b58a3ba4a371e2dc892022-12-22T02:22:58ZengCopernicus PublicationsBiogeosciences1726-41701726-41892017-06-01142815282910.5194/bg-14-2815-2017Increased temperature causes different carbon and nitrogen processing patterns in two common intertidal foraminifera (<i>Ammonia tepida</i> and <i>Haynesina germanica</i>)J. Wukovits0A. J. Enge1W. Wanek2M. Watzka3P. Heinz4University of Vienna, Department of Palaeontology, Vienna, AustriaUniversity of Vienna, Department of Palaeontology, Vienna, AustriaUniversity of Vienna, Department of Microbiology and Ecosystem Science, Terrestrial Ecosystem Research, Vienna, AustriaUniversity of Vienna, Department of Microbiology and Ecosystem Science, Terrestrial Ecosystem Research, Vienna, AustriaUniversity of Vienna, Department of Palaeontology, Vienna, AustriaBenthic foraminifera are highly abundant heterotrophic protists in marine sediments, but future environmental changes will challenge the tolerance limits of intertidal species. Metabolic rates and physiological processes in foraminifera are strongly dependent on environmental temperatures. Temperature-related stress could therefore impact foraminiferal food source processing efficiency and might result in altered nutrient fluxes through the intertidal food web. In this study, we performed a laboratory feeding experiment on <i>Ammonia tepida</i> and <i>Haynesina germanica</i>, two dominant foraminiferal species of the German Wadden Sea/Friedrichskoog, to test the effect of temperature on phytodetritus retention. The specimens were fed with <sup>13</sup>C and <sup>15</sup>N labelled freeze-dried <i>Dunaliella tertiolecta</i> (green algae) at the start of the experiment and were incubated at 20, 25 and 30 °C respectively. Dual labelling was applied to observe potential temperature effects on the relation of phytodetrital carbon and nitrogen retention. Samples were taken over a period of 2 weeks. Foraminiferal cytoplasm was isotopically analysed to investigate differences in carbon and nitrogen uptake derived from the food source. Both species showed a positive response to the provided food source, but carbon uptake rates of <i>A. tepida</i> were 10-fold higher compared to those of <i>H. germanica</i>. Increased temperatures had a far stronger impact on the carbon uptake of <i>H. germanica</i> than on <i>A. tepida</i>. A distinct increase in the levels of phytodetrital-derived nitrogen (compared to more steady carbon levels) could be observed over the course of the experiment in both species. The results suggest that higher temperatures have a significant negative effect on the carbon exploitation of <i>H. germanica</i>. For <i>A. tepida</i>, higher carbon uptake rates and the enhanced tolerance range for higher temperatures could outline an advantage in warmer periods if the main food source consists of chlorophyte phytodetritus. These conditions are likely to impact nutrient fluxes in <i>A. tepida</i>/<i>H. germanica</i> associations.http://www.biogeosciences.net/14/2815/2017/bg-14-2815-2017.pdf |
| spellingShingle | J. Wukovits A. J. Enge W. Wanek M. Watzka P. Heinz Increased temperature causes different carbon and nitrogen processing patterns in two common intertidal foraminifera (<i>Ammonia tepida</i> and <i>Haynesina germanica</i>) Biogeosciences |
| title | Increased temperature causes different carbon and nitrogen processing patterns in two common intertidal foraminifera (<i>Ammonia tepida</i> and <i>Haynesina germanica</i>) |
| title_full | Increased temperature causes different carbon and nitrogen processing patterns in two common intertidal foraminifera (<i>Ammonia tepida</i> and <i>Haynesina germanica</i>) |
| title_fullStr | Increased temperature causes different carbon and nitrogen processing patterns in two common intertidal foraminifera (<i>Ammonia tepida</i> and <i>Haynesina germanica</i>) |
| title_full_unstemmed | Increased temperature causes different carbon and nitrogen processing patterns in two common intertidal foraminifera (<i>Ammonia tepida</i> and <i>Haynesina germanica</i>) |
| title_short | Increased temperature causes different carbon and nitrogen processing patterns in two common intertidal foraminifera (<i>Ammonia tepida</i> and <i>Haynesina germanica</i>) |
| title_sort | increased temperature causes different carbon and nitrogen processing patterns in two common intertidal foraminifera i ammonia tepida i and i haynesina germanica i |
| url | http://www.biogeosciences.net/14/2815/2017/bg-14-2815-2017.pdf |
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