Morphometric techniques allow environmental reconstructions from low-diversity continental ostracode assemblages

Meeren, Thijs Van der; Verschuren, Dirk; Ito, Emi; Martens, Koenraad

doi:10.1007/s10933-010-9463-z

Cited by 16 publications

(23 citation statements)

References 16 publications

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“…8 and 9). These results, negative correlation between valve length and solute concentrations, are agree with the relation described to E. virens, Cyprideis torosa (Jones, 1850), Mytilocypris henricae (Chapman, 1966), L. inopinata and some euryhaline ostracods (Barker, 1963;Martens, 1985;Yin et al, 1999;Fernandes Martins et al, 2009;Van der Meeren et al, 2010).…”

Section: Size Variability and Environmental Effectssupporting

confidence: 86%

“…E. virens and L. inopinata) that might be explained by genetic and environmental factors (Baltana´s and Geiger, 1998). Van der Meeren et al (2010) observed that a greater shape variance of L. inopinata inhabiting highly fluctuating environments, responds to temperature, specific conductance and higher clonal diversity of populations. It would be interesting to conduct genetic studies of E. fontana to evaluate the genetic variability within and between populations from different sites.…”

Section: Shape Variability and Environmental Effectsmentioning

confidence: 93%

“…Table 1. (Alcorlo et al, 1999) and for L. inopinata shape changes with the salinity and pH of the host water (Baltana´s and Geiger, 1998;Roberts et al, 2002;Yin et al, 1999;Van der Meeren et al, 2010). In lab conditions the temperature has little effect on E. virens shape cultures but, in natural populations, morphological differences could be driven by environmental factors (Baltana´s and Geiger, 1998;Baltana´s et al, 2002).…”

Section: Shape Variability and Environmental Effectsmentioning

confidence: 99%

“…Most of the morphometric ostracods studies performed outline analysis utilizing Fourier Analysis or Linhart's B-spline algorithm because ostracods valves do not always provide enough landmarks, or landmarks easy to record (e.g. Baltana´s and Geiger, 1998;Yin et al, 1999;Van der Meeren et al, 2010). In Patagonia, a key region of special interest to Quaternary paleoclimate research, Wrozyna et al (2008) have carried out a preliminary study using geometric morphometric techniques.…”

Section: Introductionmentioning

confidence: 99%

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Eucypris fontana(Graf, 1931) (Crustacea, Ostracoda) in permanent environments of Patagonia Argentina: a geometric morphometric approach

Ramos

Alperín

Pérez

et al. 2015

Ann. Limnol. - Int. J. Lim.

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-Ostracods are microcrustaceans with a calcareous carapace, very useful as paleoenvironmental indicators. Eucypris fontana (Graf, 1931) is a non-marine ostracod species, distributed in southern Neotropics, commonly found in living bisexual populations as well as in quaternary sequences in Patagonia. Geometry morphometric analysis offers efficient and powerful techniques to quantify, describe and analyze shape and size variations. In this study, phenotypic changes in the carapace (size and shape) of E. fontana were analyzed using geometric morphometric methods. One hundred and two valves, including males and females from surface sediments of six permanent water bodies located in Patagonia, Argentina, were analyzed. Male and female valves are spread in the morphospace and sexual dimorphism in size and shape were no perceived. Valve size (centroid size) differed between environments; larger individual were correlated with higher Mg 2+ , Ca 2+ , K + concentrations and temperature and lower pH ( y 9.1) of the host waters, whereas smaller specimens were associated with the opposite environmental extreme. The principal component analysis performed with Procrustes coordinates (shape) indicated a morphological gradient between elongated and rounded valves; major changes occurring on the dorsal margin, calcified inner lamella and in the position of the adductor muscles scars. Rounded carapaces were related whit higher Ca 2+ and Mg 2+ concentration and lower pH ( y 8.6) environments, whereas elongated valves were associated with the opposite environmental extreme. These results highlight the importance of morphometric studies of E. fontana in ecological research and their potential use in paleoenvironmental studies in Patagonia and other regions where this taxon is found.

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Section: Size Variability and Environmental Effectssupporting

confidence: 86%

Section: Shape Variability and Environmental Effectsmentioning

confidence: 93%

Section: Shape Variability and Environmental Effectsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Eucypris fontana(Graf, 1931) (Crustacea, Ostracoda) in permanent environments of Patagonia Argentina: a geometric morphometric approach

Ramos

Alperín

Pérez

et al. 2015

Ann. Limnol. - Int. J. Lim.

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“…Within freshwater invertebrates, ecophenotypic response has been documented for a variety of species, both recent and fossil (e.g., Hellberg et al, 2001;Zieritz and Aldridge, 2009;Inoue et al, 2013;Neubauer et al, 2013;Clewing et al, 2015). 10 Ostracods represent a model group for the study of ecophenotypical variation in response to environmental change (Anadón et al, 2002;Frenzel et al, 2012;Fürstenberg et al, 2015;van der Meeren et al, 2010). Due to their calcitic valves, they have an excellent fossil record and are utilized as palaeoenvironmental and biostratigraphic indicators (Anadón et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Impact of climate and hydrochemistry on shape variation – a case study on Neotropical cytheroidean Ostracoda

Wrozyna¹,

Neubauer²,

Meyer³

et al. 2017

Preprint

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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 15 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 20Procrustes 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 25 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. 30Biogeosciences Discuss., https://doi

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TheIlyocyprispuzzle: A multidisciplinary approach to the study of phenotypic variability

Mazzini

Gliozzi

Rossetti

et al. 2014

Internat. Rev. Hydrobiol.

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Ilyocypris Brady and Norman () is a widespread freshwater ostracod genus including about 30 living and 190 fossil species. The specific identification of the living Ilyocypris relies mainly on the appendages. An identification exclusively based on valves is rather complicated because of a high intraspecific variability of their characters in several species. This study aims to test the taxonomic significance of the valves characters through the examination of specimens unambiguously identified on the basis of their soft part morphology, in order to provide useful taxonomic criteria for the identification of Ilyocypris shells in fossil assemblages. Sixty‐five ilyocypridid specimens collected in mainland Italy and surrounding islands were analyzed. The patterns of valve surface ornamentation and of marginal ripplets were examined by electron microscopy. Moreover, the geometric morphometric analysis of the valve outlines was performed. Sixty‐two specimens could be easily accommodated in eight Ilyocypris species (I. bradyi, I. decipiens, I. getica, I. gibba, I. hartmanni, I. inermis, I. monstrifica, and I. salebrosa) according to the morphology of their appendages. Three additional specimens, with soft parts typical of Ilyocypris but clearly distinct valve morphology, were left in open nomenclature. Our results show that the outline analysis is often a valid tool to discriminate between different species. Conversely, valve ornamentation displays different degrees of intraspecific variability in some Ilyocypris species. The marginal ripplets are constant within each species population, but they do not always mirror the patterns reported by other authors; therefore, we do not consider them as reliable diagnostic character for specific determination. This study confirms that the identification of Ilyocypris species requires accurate description of appendages as well as external and internal carapace characteristics, and stresses the advantage of a combined neontological and paleontological investigation in solving taxonomic problems related to non‐marine ostracods.

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Morphometric techniques allow environmental reconstructions from low-diversity continental ostracode assemblages

Cited by 16 publications

References 16 publications

Eucypris fontana(Graf, 1931) (Crustacea, Ostracoda) in permanent environments of Patagonia Argentina: a geometric morphometric approach

Eucypris fontana(Graf, 1931) (Crustacea, Ostracoda) in permanent environments of Patagonia Argentina: a geometric morphometric approach

Impact of climate and hydrochemistry on shape variation – a case study on Neotropical cytheroidean Ostracoda

TheIlyocyprispuzzle: A multidisciplinary approach to the study of phenotypic variability

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