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Biogeosciences An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/bg-2017-390
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
10 Nov 2017
Review status
This discussion paper is a preprint. A revision of the manuscript is under review for the journal Biogeosciences (BG).
Impact of climate and hydrochemistry on shape variation – a case study on Neotropical cytheroidean Ostracoda
Claudia Wrozyna1, Thomas A. Neubauer2,3, Juliane Meyer1, Maria Ines F. Ramos4, and Werner E. Piller1 1Institute of Earth Sciences, NAWI Graz Geocenter, University of Graz, Graz, 8010, Austria
2Department of Animal Ecology & Systematics, Justus Liebig University, Giessen, 35392, Germany
3Naturalis Biodiversity Center, Leiden, 2300 RA, the Netherlands
4Coordenação de Ciências da Terra e Ecologia, Museu Paraense Emílio Goeldi, 66077-830, Brazil
Abstract. How environmental change affects a species’ phenotype is crucial not only for taxonomy and biodiversity assessments but also for their application as (paleo-)ecological indicators. Previous investigations addressing the impact of climate and hydrochemical regime on ostracod valve morphology have yielded quite contrasting results. Frequently identified ecological factors influencing carapace shape are salinity, cation and sulphate concentrations and alkalinity. Here, we present a thorough approach integrating data from carapace outline and surface details of the ubiquitous Neotropical cytheroidean ostracod species Cytheridella ilosvayi, as well as several climatic and hydrochemical variables, in order to investigate a potential link between morphology and environmental conditions. A previous study lately demonstrated considerable biogeographical variation in valve morphology among Floridian, Mexican and Brazilian populations of this species. We hypothesize that the climatic differences between the regions it inhabits and associated differences in hydrochemical regimes have influenced valve morphology and eventually led to biogeographically distinctive groups. Generalized least-squares Procrustes Analyses based on outline and structural features were applied to left and right valves of adult females and males. The analyses identified relative carapace length and shape symmetry as most important morphological characteristics representing shape change across all datasets. Two-block partial least-squares analyses and multiple regressions indicate strong relationships between morphological and environmental variables, specifically with temperature seasonality, annual precipitation and chloride and sulphate concentrations. We hypothesize that increased temperature seasonality slowed down growth rates during colder months, potentially triggering the development of shortened valves with well-developed brood pouches. Differences in chloride and sulphate concentrations, related to fluctuations in precipitation, are considered to affect valve development via controlling osmoregulation and carapace calcification. These factors represent hitherto unknown drivers for ostracod ecophenotypy and emphasise that environmental predictors for morphological variability are not consistent across non-marine ostracods.
Citation: Wrozyna, C., Neubauer, T. A., Meyer, J., Ramos, M. I. F., and Piller, W. E.: Impact of climate and hydrochemistry on shape variation – a case study on Neotropical cytheroidean Ostracoda, Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-390, in review, 2017.
Claudia Wrozyna et al.
Claudia Wrozyna et al.
Claudia Wrozyna et al.

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Short summary
How environmental change affects a species' phenotype is crucial for taxonomy and biodiversity assessments and for their application as (paleo-)ecological indicators. Morphometric data of a Neotropical ostracod species, as well as several climatic and hydrochemical variables, were used to investigate the link between morphology and environmental conditions. Temperature seasonality, annual precipitation, and chloride and sulphate concentrations were identified as drivers for ostracod ecophenotypy
How environmental change affects a species' phenotype is crucial for taxonomy and biodiversity...
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