UWSpace is currently experiencing technical difficulties resulting from its recent migration to a new version of its software. These technical issues are not affecting the submission and browse features of the site. UWaterloo community members may continue submitting items to UWSpace. We apologize for the inconvenience, and are actively working to resolve these technical issues.
 

The Hyalella (Crustacea: Amphipoda) species cloud of the ancient Lake Titicaca originated from multiple colonizations

Thumbnail Image

Files

1-s2.0-S1055790317301549-main.pdf (1.76 MB)

Date

2018-08

Authors

Adamowicz, Sarah J.
Marinone, María Cristina
Menu-Marque, Silvina
Martin, Jeffrey W.
Allen, Daniel C.
Pyle, Michelle N.
De los Ríos, Patricio
Sobel, Crystal N.
Ibañez, Carla
Pinto, Julio

Journal Title

Journal ISSN

Volume Title

Publisher

Elsevier

Abstract

Ancient lakes are renowned for their exceptional diversity of endemic species. As model systems for the study of sympatric speciation, it is necessary to understand whether a given hypothesized species flock is of monophyletic or polyphyletic origin. Here, we present the first molecular characterization of the Hyalella (Crustacea: Amphipoda) species complex of Lake Titicaca, using COI and 28S DNA sequences, including samples from the connected Small and Large Lakes that comprise Lake Titicaca as well as from a broader survey of southern South American sites. At least five evolutionarily distant lineages are present within Lake Titicaca, which were estimated to have diverged from one another 12–20 MYA. These major lineages are dispersed throughout the broader South American Hyalella phylogeny, with each lineage representing at least one independent colonization of the lake. Moreover, complex genetic relationships are revealed between Lake Titicaca individuals and those from surrounding water bodies, which may be explained by repeated dispersal into and out of the lake, combined with parallel intralacustrine diversification within two separate clades. Although further work in deeper waters will be required to determine the number of species present and modes of diversification, our results strongly indicate that this amphipod species cloud is polyphyletic with a complex geographic history.

Description

The final publication is available at Elsevier via https://doi.org/10.1016/j.ympev.2018.03.004. © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/

Keywords

ancient lakes, species flocks, sympatric speciation, evolutionary radiation, Lake Titicaca

LC Keywords

Citation

URI

https://doi.org/10.1016/j.ympev.2018.03.004
 http://hdl.handle.net/10012/13502

Collections

Waterloo Research
Biology