Journal of Paleolimnology

, Volume 44, Issue 4, pp 903–911

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

  • Thijs Van der Meeren
  • Dirk Verschuren
  • Emi Ito
  • Koen Martens
Original paper

Abstract

Quantification of intra-specific morphological variability of aquatic biota along environmental gradients can produce biological proxies that can be applied to paleoenvironmental reconstructions. This morphology-derived proxy information can be especially valuable when dealing with low-diversity fossil assemblages, i.e. in situations when paleoenvironmental inference based on species composition of the assemblage is less effective. We analyzed valve size and outline shape of the widespread and highly environmentally tolerant ostracode species Limnocythere inopinata collected in 15 lakes and ponds of Western Mongolia. We quantified shape variability among and within these living populations in relation to water chemistry and physical habitat variables. Our results indicate that: (1) a population’s mean valve outline is related to habitat type, (2) surface water temperature, the alkalinity to sulphate ratio, specific conductance and total phosphorus together explain a high portion of the variance in mean valve outline between populations, and (3) a quantitative model inferring the alkalinity to sulphate ratio from mean valve outline has an R² of 0.88 and RMSEP of 0.17. These results corroborate the hypothesis that high morphological variability in this ostracode species is due to both ecophenotypic variance and high clonal diversity associated with a mixed reproductive strategy (a combination of sexual and parthenogenetically reproducing lineages), and underline the value of morphometric techniques in paleoecology.

Keywords

Ostracoda Morphometric techniques Ecophenotypic variation Clonal ecology 

Supplementary material

10933_2010_9463_MOESM1_ESM.pdf (118 kb)
Illustration of morphometric outline variance (standardized for area) for the full set of included outlines and for three selected populations (a) all included outlines (fifteen populations, n = 149) (b) population d3 (c) population m2 (d) population s1. Thin black lines indicate individual valve outlines by thin plate splines algoritm (see Materials and methods), thicker red lines indicate the corresponding computed mean population shape. The selected populations represent extremes in the observed morphospace as identified by NMDS (cf. Fig. 1 manuscript) (PDF 119 kb)

Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Thijs Van der Meeren
    • 1
    • 2
  • Dirk Verschuren
    • 2
  • Emi Ito
    • 3
  • Koen Martens
    • 1
    • 2
  1. 1.Freshwater BiologyRoyal Belgian Institute of Natural SciencesBrusselsBelgium
  2. 2.Limnology Unit, Biology DepartmentGhent UniversityGhentBelgium
  3. 3.Geology and GeophysicsUniversity of MinnesotaMinneapolisUSA

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