Body-size variability results from a variety of extrinsic and intrinsic factors (environmental
and biological influences) underpinned by phylogeny. In ostracodes it is assumed that
body size is predominantly controlled by ecological conditions, but investigations have
mostly focused on local or regional study areas. In this study, we investigate the
geographical size variability (length, height, and width) of Holocene and Recent valves of
the salinity-tolerant ostracode species Cyprideis torosa within a large geographical area
(31◦–51◦
latitude, and 12◦–96◦
longitude). It is shown that distant local size clusters of
Cyprideis torosa are framed within two large-scale geographical patterns. One pattern
describes the separation of two different size classes (i.e., morphotypes) at around
∼42◦ N. The co-occurrence of both size morphotypes in the same habitats excludes an
environmental control on the distribution of the morphotypes but rather could point to
the existence of two differentiated lineages. Generally, correlations between valve size
and environmental parameters (salinity, geographical positions) strongly depend on the
taxonomic resolution. While latitude explains the overall size variability of C. torosa sensu
lato (i.e., undifferentiated for morphotypes), salinity-size correlations are restricted to
the morphotype scale. Another large-scale pattern represents a continuous increase in
valve size of C. torosa with latitude according to the macroecological pattern referred as
Bergmann trend. Existing explanations for Bergmann trends insufficiently clarify the size
cline of C. torosa which might be because these models are restricted to intraspecific
levels. The observed size-latitude relationship of C. torosa may, therefore, result
from interspecific divergence (i.e., size ordered spatially may result from interspecific
divergence sorting) while environmental influence is of minor importance. Our results
imply that geographical body-size patterns of ostracodes are not straightforward and
are probably not caused by universal mechanisms. Consideration of phylogenetic
relationships of ostracodes is therefore necessary before attempting to identify the role
of environmental controls on body size variability.
| Identifer | oai:union.ndltd.org:DRESDEN/oai:qucosa:de:qucosa:87944 |
| Date | 09 November 2023 |
| Creators | Wrozyna, Claudia, Mischke, Steffen, Hoehle, Marlene, Gross, Martin, Piller, Werner E. |
| Publisher | Frontiers Media S.A. |
| Source Sets | Hochschulschriftenserver (HSSS) der SLUB Dresden |
| Language | English |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, doc-type:article, info:eu-repo/semantics/article, doc-type:Text |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | 857499, 10.3389/fevo.2022.857499 |
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