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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/24348

Title: Valve shape is not linked to genetic species in the Eucypris virens (Ostracoda, Crustacea) species complex
Authors: Koenders, Annette
Schon, Isa
Halse, Stuart
Martens, Koen
Issue Date: 2017
Abstract: It is still unclear whether variation in nature is discrete or continuous. Species are commonly regarded as discrete units, occupying distinct ecological niches. With the wide availability of molecular methods, species are now often recognized genetically rather than morphologically, as is, for example, the case for the more than 40 genetic species of the ostracod Eucypris virens (Jurine, 1820). Here, we used B-spline outline analyses of the right valve in an attempt to morphologically recognize the genetic E. virens species from Europe, North Africa, and Australia from their valve shape. Ostracod outline analyses capture valve variability in a multidimensional and quantitative way and allow fast screening of large numbers of specimens. In our study, two significant valve clusters were identified from subsequent ordination and regression analyses but without any clear link to genetic species identity, geographical location, gender, or reproductive mode, whether standardized for size or not. There is also no effect of polyploidy on valve shape. Thus, genetic E. virens species cannot currently be recognized morphologically by valve shape and are considered to be cryptic species. Because of their extensive fossil record, ostracods are widely used as proxies for palaeoecological applications such as reconstructions of past climates. Species within fossil ostracod assemblages can usually be identified only by their valve characters. Our results imply that the occurrence of cryptic species complexes leads to underestimates of fossil diversity in palaeontological studies. It is further possible that these cryptic species have different ecological tolerances, with the risk of weakening predictions based on palaeoecological reconstructions. Therefore, genetic studies should be mandatory for defining effective conservation units and studying ecological reaction norms of cryptic ostracod and other animal and plant species.
Notes: [Koenders, Annette] Edith Cowan Univ, Ctr Ecosyst Management, 270 Joondalup Dv, Joondalup, WA 6027, Australia. [Schon, Isa; Martens, Koen] OD Nat, Freshwater Biol, Royal Belgian Inst Nat Sci, Vautierstr 29, B-1000 Brussels, Belgium. [Schon, Isa] Univ Hasselt, Res Grp Zool, Agoralaan Bldg D, B-3590 Diepenbeek, Belgium. [Halse, Stuart] Bennelongia Environm Consultants, 5 Bishop St, Jolimont, WA 6014, Australia. [Martens, Koen] Univ Ghent, Dept Biol, KL Ledeganckstr 35, B-9000 Ghent, Belgium.
URI: http://hdl.handle.net/1942/24348
DOI: 10.1111/zoj.12488
ISI #: 000405993300001
ISSN: 0024-4082
Category: A1
Type: Journal Contribution
Validation: ecoom, 2018
Appears in Collections: Research publications

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