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Impact of changing carbonate chemistry, temperature, and salinity on growth and test degradation of the benthic foraminifer Ammonia aomoriensis

Kristin Haynert and Joachim Schoenfeld
Impact of changing carbonate chemistry, temperature, and salinity on growth and test degradation of the benthic foraminifer Ammonia aomoriensis
Journal of Foraminiferal Research (April 2014) 44 (2): 76-89

Abstract

The present study investigated the combined effects of ocean acidification, temperature, and salinity on growth and test degradation of Ammonia aomoriensis. This species is one of the dominant benthic foraminifera in near-coastal habitats of the southwestern Baltic Sea that can be particularly sensitive to changes in seawater carbonate chemistry. To assess potential responses to ocean acidification and climate change, we performed a fully crossed experiment involving three temperatures (8, 13, and 18 degrees C), three salinities (15, 20, and 25) and four pCO (sub 2) levels (566, 1195, 2108, and 3843 mu atm) for six weeks. Our results highlight a sensitive response of A. aomoriensis to undersaturated seawater with respect to calcite. The specimens continued to grow and increase their test diameter in treatments with pCO (sub 2) <1200 mu atm, when Omega (sub calc) >1. Growth rates declined when pCO (sub 2) exceeded 1200 mu atm (Omega (sub calc) <1). A significant reduction in test diameter and number of tests due to dissolution was observed below a critical Omega (sub calc) of 0.5. Elevated temperature (18 degrees C) led to increased Omega (sub calc) , larger test diameter, and lower test degradation. Maximal growth was observed at 18 degrees C. No significant relationship was observed between salinity and test growth. Lowered and undersaturated Omega (sub calc) , which results from increasing pCO (sub 2) in bottom waters, may cause a significant future decline of the population density of A. aomoriensis in its natural environment. At the same time, this effect might be partially compensated by temperature rise due to global warming.


ISSN: 0096-1191
EISSN: 1943-264X
Coden: JFARAH
Serial Title: Journal of Foraminiferal Research
Serial Volume: 44
Serial Issue: 2
Title: Impact of changing carbonate chemistry, temperature, and salinity on growth and test degradation of the benthic foraminifer Ammonia aomoriensis
Affiliation: Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
Pages: 76-89
Published: 201404
Text Language: English
Publisher: Cushman Foundation for Foraminiferal Research, Ithaca, NY, United States
References: 60
Accession Number: 2014-030367
Categories: Invertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Includes appendix
Illustration Description: illus. incl. 3 tables
N54°21'00" - N54°21'00", E10°10'00" - E10°10'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Cushman Foundation for Foraminiferal Research. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201419
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