Biology Faculty Publications

Document Type

Article

Keywords

Brachyura, Fiddler crab, Uca, Structural variation, Landmark analysis, Isolation, Ecophenotypy

Journal/Book/Conference Title Title

Aquatic Biology

Volume

20

Issue

1

First Page

53

Last Page

67

Abstract

Isolation due to geographical barriers should promote genetic and morphological divergence among populations. Marine currents flowing in opposing directions along landmasses can constitute barriers that isolate populations dependent upon aquatic dispersal. The distribution of fiddler crabs (genus Uca) is regulated primarily by the oceanic transport of their planktonic larvae and by available adult habitat. Along the Brazilian coast of eastern South America, the flow of 2 major oceanic currents separates northern from southern Uca populations, which may promote intraspecific divergence in ‘trans-Brazilian’ species. Populations of 10 Uca species were sampled at 64 locations north and south of the Ponta do Calcanhar, Rio Grande do Norte, Brazil. Carapace shape was assessed using geometric morphometrics to analyze 12 surface landmarks in 1319 female crabs. Carapace shape differs significantly in each species. In morphospace, the carapace forms of the 10 species appear to separate into traditional subgeneric clusters. Within the 8 species exhibiting trans-Brazilian distributions, northern and southern populations show distinct carapace differences. Depending on species, either the hepatic or the branchial region is larger in northern populations. Since significant genetic variability among such populations has not been confirmed, divergence in carapace shape suggests significant ecological modulation of phenotype within each species. Apparently, environmental differences between northern and southern localities exert a greater impact on carapace morphology than impeded gene flow. The drivers underpinning diversification of carapace shape remain unknown, however.

Department

Department of Biology

Comments

First published in Aquatic Biology, v. 20 n. 1 (2014), pp. 53-67, published by Inter-Research. DOI:10.3354/ab00545

Original Publication Date

1-13-2014

DOI of published version

10.3354/ab00545

Repository

UNI ScholarWorks, University of Northern Iowa, Rod Library

Date Digital

2014

Copyright

©2014 Kelsey R. Hampton, Melanie J. Hopkins, John C. McNamara, and Carl L. Thurman

Creative Commons License

Creative Commons Attribution 4.0 License
This work is licensed under a Creative Commons Attribution 4.0 License.

Language

EN

File Format

application/pdf

Included in

Biology Commons

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