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Different Processes Lead to Similar Patterns: a Test of Codivergence And Barber et al. BMC Evolutionary Biology 2011, 11:343 http://www.biomedcentral.com/1471-2148/11/343 RESEARCHARTICLE Open Access Different processes lead to similar patterns: a test of codivergence and the role of sea level and climate changes in shaping a southern temperate freshwater assemblage Brian R Barber1*, Peter J Unmack1, Marcos Pérez-Losada1,2, Jerald B Johnson1,3 and Keith A Crandall1,3 Abstract Background: Understanding how freshwater assemblages have been formed and maintained is a fundamental goal in evolutionary and ecological disciplines. Here we use a historical approach to test the hypothesis of codivergence in three clades of the Chilean freshwater species assemblage. Molecular studies of freshwater crabs (Aegla: Aeglidae: Anomura) and catfish (Trichomycterus arealatus: Trichomycteridae: Teleostei) exhibited similar levels of genetic divergences of mitochondrial lineages between species of crabs and phylogroups of the catfish, suggesting a shared evolutionary history among the three clades in this species assemblage. Results: A phylogeny was constructed for Trichomycterus areolatus under the following best-fit molecular models of evolution GTR + I + R, HKY + I, and HKY for cytochrome b, growth hormone, and rag 1 respectively. A GTR + I + R model provided the best fit for both 28S and mitochondrial loci and was used to construct both Aegla phylogenies. Three different diversification models were observed and the three groups arose during different time periods, from 2.25 to 5.05 million years ago (Ma). Cladogenesis within Trichomycterus areolatus was initiated roughly 2.25 Ma (Late Pliocene - Early Pleistocene) some 1.7 - 2.8 million years after the basal divergences observed in both Aegla clades. These results reject the hypothesis of codivergence. Conclusions: The similar genetic distances between terminal sister-lineages observed in these select taxa from the freshwater Chilean species assemblage were formed by different processes occurring over the last ~5.0 Ma. Dramatic changes in historic sea levels documented in the region appear to have independently shaped the evolutionary history of each group. Our study illustrates the important role that history plays in shaping a species assemblage and argues against assuming similar patterns equal a shared evolutionary history. Keywords: Aegla, biogeography, Chile, cladogenesis, freshwater, Trichomycterus Background interacting (i.e form a community). Understanding the Understanding how species assemblages have been relative roles these two processes have had in shaping formed and maintained is a central question in biology species assemblages or communities is challenging [8]. A [1-4]. Historical processes, such as river capture and cli- logical first-step, especially in poorly studied regions, is mate change, likely played significant roles in driving the to apply historical methods to understand how past formation of aquatic species assemblages [5-7], whereas events have shaped current patterns [9]. In this study we ecological processes may help maintain species interac- apply comparative phylogeography and biogeography tions in co-occurring species if in fact those species are methods [10,11] to test the hypotheses that historical abiotic events are responsible for generating the pattern of similar levels of genetic divergence recently observed * Correspondence: [email protected] 1Evolutionary Ecology Laboratories, Department of Biology, Brigham Young in two diverse taxa (three clades) that are codistributed University, Provo, UT 84602 USA in freshwater systems of Chile. Full list of author information is available at the end of the article © 2011 Barber et al; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Barber et al. BMC Evolutionary Biology 2011, 11:343 Page 2 of 9 http://www.biomedcentral.com/1471-2148/11/343 Freshwater systems in Chile are biogeographically rates. In addition, Late Pleistocene climate changes might unique and were likely impacted by changes in sea levels have altered cladogenic rates due to changes in stream (Figure 1). High gradient rivers originate in the Andes flow patterns and volume that altered the distribution of Mountains (1000 - 7000 m above sea level) then flow these organisms. westward to the Pacific Ocean, a distance of only 100 - Compared to the Northern Hemisphere, relatively few 220 km [12]. Currently, most Chilean rivers are quite iso- phylogeographic or phylogenetic studies have been under- lated from each other with the most likely colonization taken in southern latitudes, especially in temperate fresh- routes between them are across drainage divides or via water ecosystems [14]. However, phylogeographic and coastal seas [13]. Gene flow between drainages could phylogenetic studies of terrestrial and freshwater taxa in have occurred if rivers coalesced on the continental shelf Chile and Argentina [15,16] are beginning to provide during historical periods of low sea levels. However, the insights into the evolutionary history of this important continental shelf is narrow, only 10 - 60 km, providing region. Because aquatic diversity in Chile is relatively limited opportunity for rivers to coalesce during lowered depauperate [17,18] examination of a few widespread can sea levels [13]. We predict divergence between popula- provide important insights into the evolutionary history of tions would occur when sea levels are high, because the the region. For example, a phylogenetic study of fresh- already restricted freshwater systems would have been water crabs in the genus Aegla (Aeglidae: Anomura; truncated even more, thereby facilitating genetic drift [19,20] and a phylogeographic study of the freshwater and the accumulation of genetic divergence. In contrast, catfish (Trichomycterus areolatus: Trichomycteridae: Tele- incipient divergence would have been erased when ostei; [13] discovered similar levels of model-corrected admixture occurred during lowered sea levels because genetic distance of mitochondrial lineages between Aegla previously isolated populations were merged. Overall, (cytochrome oxidase I and II genes: 1598 base pairs) and dramatic fluctuations in sea level should alter cladogenic Trichomycterus (cytochrome b: 1137 base pairs). For Crab A Crab B Catfish TaA lae TaC TaB aff A sca A tal TaD bah occ pew cho TaE ara spe den ros man TaF rio B abt lac hue TaG neq A ala Figure 1 Map of South America showing major river systems of Chile and Argentina and distributions of Aegla taxa and Trichomycterus areolatus clades. Barber et al. BMC Evolutionary Biology 2011, 11:343 Page 3 of 9 http://www.biomedcentral.com/1471-2148/11/343 example, genetic distance between two rivers, Río Maipo 1.7 - 2.8 million years after the basal divergences and Río Maule, are 2.6 - 2.8% and 2.0 - 2.8% in Aegla lae- observed in both Aegla clades. The 95% highest posterior vis and Trichomycterus areolatus respectively. In addition, density (HPD) of the basal Aegla nodes are consistant genetic distances between codistributed sister-lineages are with episodes of increased sea levels documented at the similar. For example, sister-clades (phylogroups: D + E: Bay of Tongoy, Chile (~ 4.2 - 5.0 Ma; [24]), whereas the Figure 2) in Trichomycterus areolatus and sister-taxa basal node of Trichomycterus areolatus emerge during a Aegla bahamondei + A. occidentalis have overlapping time of decreased sea levels that occurred in the region divergence values of 1.0 - 2.3% and 1.7% respectively. Two roughly 1.4 - 2.2 Ma [24]. Both crab phylogenies date to codistributed phylogroups in Trichomycterus areolatus the Pliocene with AeglaA basal divergence occurring (clades F + G) and within Aegla abtao have similar, but most recently (3.95 Ma), whereas AeglaB originated 5.05 non-overlapping, divergence values of 3.3 - 4.8% and 2.4 - Ma. Moreover, the majority of cladogenic events (15/19) 3.2% respectively (see [13] for further discussion). Similar in the crab phylogenies date to the Pliocene or Early levels of genetic distance between contemporary lineages Pleistocene(>1Ma).Onlythreecladogenicevents, suggest these taxa may have been influenced by the same (AeglaA: node H; AeglaB: node J and K) occurred during events. Finally both taxa are codistributed and often sym- the especially high amplitude climate cycles of the last 1 patric in the region suggesting both may have been simi- million years. All but one of the six cladogenic events in larly affected by the abiotic events that have shaped the Trichomycterus areolatus occurred during the Pleisto- region [13,20-23]. cene, with two events consistent with the high amplitude In this study we test the hypothesis of codivergence climate cycles of the last 1 Ma. Overall only five of the between Aegla species and Trichomycterus phylogroups. twenty-five cladogenic events events occurred during the In other words, are the same historical events documen- last 1 Ma ted in the region responsible for generating the nearly Effective sample sizes for node estimates were over identical levels of genetic divergence observed in these 500 (as were most parameters); thus, we assume the taxa? Four major geological and climate events may have results are from thoroughly sampled analyses. Models played a role in shaping the evolutionary history of these selected using AIC for Trichomycterus
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