Biogeography and evolution of a widespread Central American lizard species complex: Norops humilis, (Squamata: Dactyloidae)
© Phillips et al. 2016
Received: 11 March 2015
Accepted: 26 May 2015
Published: 19 July 2015
Caribbean anole lizards (Dactyloidae) have frequently been used as models to study questions regarding biogeography and adaptive radiations, but the evolutionary history of Central American anoles (particularly those of the genus Norops) has not been well studied. Previous work has hypothesized a north-to-south dispersal pattern of Central American Norops, but no studies have examined dispersal within any Norops lineages. Here we test two major hypotheses for the dispersal of the N. humilis/quaggulus complex (defined herein, forming a subset within Savage and Guyer’s N. humilis group).
Specimens of the N. humilis group were collected in Central America, from eastern Mexico to the Canal Zone of Panama. Major nodes were dated for comparison to the geologic history of Central America, and ancestral ranges were estimated for the N. humilis/quaggulus complex to test hypothesized dispersal patterns. These lineages displayed a northward dispersal pattern. We also demonstrate that the N. humilis/quaggulus complex consists of a series of highly differentiated mitochondrial lineages, with more conserved nuclear evolution. The paraphyly of the N. humilis species group is confirmed. A spatial analysis of molecular variance suggests that current populations are genetically distinct from one another, with limited mitochondrial gene flow occurring among sites.
The observed south-to-north colonization route within the Norops humilis/quaggulus complex represents the first evidence of a Norops lineage colonizing in a south-to-north pattern, (opposite to the previously held hypothesis for mainland Norops). One previously described taxon (N. quaggulus) was nested within N. humilis, demonstrating the paraphyly of this species; while our analyses also reject the monophyly of the Norops humilis species group (sensu Savage and Guyer), with N. tropidonotus, N. uniformis, and N. marsupialis being distantly related to/highly divergent from the N. humilis/quaggulus complex. Our work sheds light on mainland anole biogeography and past dispersal events, providing a pattern to test against other groups of mainland anoles.
Central America is an important region for understanding historical biogeography and intercontinental dispersal in the Western Hemisphere. Mesoamerica has served as a pathway of dispersal for many taxa, some of which originated in North America and dispersed south (e.g. Pitvipers , but see ; Bolitoglossine salamanders ) and others that moved north following a southern origin (e.g. hylid frogs ; toads ). Lower Central America (LCA) displays extraordinary high levels of species diversity in many taxonomic groups including insects , fish [7, 8] and herpetofauna [9, 10]. Many phylogeographic studies in LCA have been conducted on a diverse assemblage of organisms, including trees [11, 12], mammals [13–15], fish [16, 17], and amphibians [3, 18, 19]. In reptiles, there have been some work on squamate biogeography [1, 20–24], but the majority of these studies have centered on snakes, with no published multi-locus phylogeographic studies on lizards in Central America (Hasbún et al.  uses a single mtDNA marker to investigate biodiversity in a species of Ctenosaura). Given the rich history of scientific work on lizards in the Caribbean, especially anoles (family Dactyloidae [26–29]), the lack of biogeographic work on mainland lizards is somewhat surprising.
Within the N. humilis species group, a total of 1451 aligned bp of mitochondrial data were collected for 192 individuals and 1522 aligned bp of the nuclear gene region ITS-1 was collected for 48 individuals. All newly acquired data were combined with published sequences for 65 additional Norops species (Additional file 2: Appendix S2) in order to investigate the monophyly of the N. humilis species group and of the N. humilis/quaggulus complex. Sequences were edited using Sequencher 4.9 (GeneCodes Corp., Ann Arbor, MI, USA) and aligned initially using MUSCLE in MEGA 5.2.2 , then adjusted manually.
The relatively continuous geographic distribution of the N. humilis/quaggulus complex combined with a lack of distinct phenotypic differences made a priori separation of sampling localities into populations somewhat arbitrary. In order to describe the genetic structure and identify the best maximally differentiated number of populations within the N. humilis/quaggulus complex, a spatial analysis of molecular variance (SAMOVA 1.0) was used to group 15 localities selected in this study (each with n ≥ 4 specimens; Additional file 3: Appendix S3) into a number of user-defined clusters (K). For each cluster, the proportion of total genetic variance (high F CT index) due to differences between populations  was estimated and evaluated to select the optimal number of genetic groups. A simulated annealing process for each cluster (K = 2 to 14) was repeated 1023 times for each of 100 sets of initial conditions to ensure that the final population groups were not affected by the initial configuration. Significance of the F SC index was used to obtain the suggested number of genetic groupings for the localities selected . This analysis was based on sequences for the mitochondrial region only, since ITS-1 data were only obtained for a limited number of specimens, and were not sufficient for population genetic analysis.
Phylogenetic estimations were conducted under Bayesian analytical methods. PARTITIONFINDER  was used to select models of evolution as well as to examine the suitability of partitioning each dataset (mitochondrial, nuclear, and concatenated). In all cases each gene (including tRNAs) was entered as a potential partition. Protein coding genes were further partitioned by codon position for the PartitionFinder analysis. Branch lengths were unlinked, all models of evolution available in MRBAYES 3.2.2  were tested, and a BIC information criterion and greedy algorithm were used. The PARTITIONFINDER analysis recommended a HKY + I + Γ model of evolution for the mtDNA segment, and GTR + Γ for the nuclear data with no partitioning recommended within either region. For the combined dataset, two partitions were recommended (mt and nuc) with GTR + I + Γ as the selected model of evolution for both partitions.
Bayesian analyses for each dataset (as above) were conducted using MRBAYES and BEAST 1.7.5 . The phylogenetic hypotheses using MRBAYES 3.2.2 was developed using 20 million generations, sampling every 1000 generations for two independent runs using four Markov chains with node support evaluated via posterior probabilities (BAPP). We evaluated stationarity of variables by examining our output via TRACER v1.5 . The first 20 % of trees were discarded as burnin and a majority rule consensus tree was generated to summarize the post-burnin results. With the phylogeny constructed using BEAST, we estimated divergence dates, employing a lognormal relaxed clock and a calibration rate of 0.65 % per million years for mtDNA  with a Yule Process speciation prior. This rate has been used for our selected mitochondrial gene region for reptile and amphibian groups [51, 52] including anoles (e.g. [53, 54]; mean of a prior distribution, SD = 0.0025 for ucld.mean parameter). The calibration rate was only applied to the mtDNA analysis, as there are no calibration rates available for the nuclear ITS-1 gene. In addition to Bayesian analyses, ML analyses were conducted on each dataset using MEGA 5.2.2 with node support evaluated via bootstrap analyses (MLBS) based on 2000 replications. In addition to the constructed topologies, pairwise genetic distance (uncorrected-p) was estimated between all individuals included in the phylogenetic analyses using both the mitochondrial and concatenated datasets. These distances were compared among all major lineages (as indicated by phylogenetic analysis) of N. humilis species group members, as well as within each species or lineage using MEGA 5.2.2.
Phylogeographic hypotheses were tested using likelihood-based inference in LAGRANGE [55, 56]. The analysis was conducted using the phylogeny constructed with BEAST for mtDNA only, as divergence dating was not available for the nuclear (ITS) tree. Dispersal events between regions were examined and ancestral ranges were estimated within the N. humilis/quaggulus complex to evaluate the support for each of the hypotheses presented above (Fig. 1). The geographic regions coded were (1) the Caribbean versant of the Chorotega Block, (2) the Pacific versant of the Chorotega Block, (3) the lowlands of the Chortis Block and (4) Highlands of the Chortis Block. These areas represent the entire range of the N. humilis/quaggulus complex and were selected based on major geographic barriers. For the analysis, dispersal was constrained to be possible only between adjacent regions because the anoles studied herein are both small and ground dwelling, which would make rapid dispersal to very distant and non-adjacent regions unlikely. If the complex originated in the northern part of the range (i.e. Honduras or northern Nicaragua) with younger clades in the south, it would indicate a north-to-south dispersal, while a southern origin would support a south-to-north colonization route.
The trees from our mitochondrial analyses were similar in topology to those from the combined data with the only difference being a lineage of the N. humilis/quaggulus complex restricted to the Pacific versant of Costa Rica and Nicaragua (N. humilis lineage 3, Figs. 2, 3, 4, 5 and 6). In the Bayesian analysis of mtDNA, this lineage formed two separate clades: one was comprised of samples from Monteverde, Costa Rica and the other was comprised of all additional nearby samples from Guanacaste, Costa Rica plus specimens from southern Nicaragua (Fig. 4). These samples formed a single lineage for the concatenated dataset using both Bayesian (Fig. 3) and ML as well as for the mtDNA dataset using ML. We also constructed a phylogenetic tree on the mtDNA dataset with BEAST. Results of the BEAST analysis provided a topology in agreement with the tree constructed using MRBAYES for all major lineages (Fig. 6). When considering 0.65 % per lineage per million years for the mtDNA data, the origin of the N. humilis/quaggulus complex was estimated to be 17.2 Myr BP (95 % CI = 14.2-20.6 Myr BP). The stem age for each of the distinct mitochondrial lineages of the N. humilis/quaggulus complex were estimated to have originated between 10.3 and 3.2 Myr BP (Fig. 6).
When using only the nuclear ITS-1 dataset, lineages were less divergent than either mitochondrial dataset described above. The Bayesian analyses differed slightly from the mtDNA and combined analyses by presenting only four main clades of the N. humilis/quaggulus complex (Fig. 5). Primary differences included the presence of a conjoined Panamanian/eastern Costa Rican clade (lineages 1 and 2), a single Pacific Costa Rican clade (monophyletic lineage 3), one clade (lineage 4) of a single Caribbean Costa Rican locality (la Lola, Limon Province) and the remaining Caribbean Costa Rican samples (lineages 5 and 6) grouping together in an unresolved clade. The ML analysis of ITS-1 reduced the N. humilis/quaggulus complex to three main clades: Eastern Costa Rica/Panama (lineages 1 and 2), Pacific Costa Rica plus one Caribbean site (lineages 3 and 4), and the remaining Caribbean Costa Rican samples (lineages 5 and 6; figure not shown). However, the clades in the ML analysis lack significant support, possibly due to the conservative nature of ITS-1, which failed to yield significant variation among closely related lineages.
Genetic distance among members of the Norops humilis species group (sensu Savage and Guyer )
SAMOVA was used to designate the optimal number of distinct genetic clusters within the N. humilis/quaggulus complex. Grouping of the 15 sample localities into 12 clusters by SAMOVA yielded an F SC value (0.03) that approached zero (Additional file 3: Appendix S3). A lack of shared haplotypes among the localities used in the analysis indicated limited gene flow, at least for the genes in question. K = 12 was chosen as the most likely number of clusters, because it maximized the variation among clusters (F CT = 0.86) while minimizing the variation among localities within clusters (F SC ). While F CT increased for K = 13 and K = 14, the difference was slight (F CT = 0.86 and 0.87 respectively). Rodríguez-Robles et al.  stated that F CT should peak where F SC = 0, so we use F SC as the determining factor in our analysis, given the low magnitude of increases in F CT created by additional partitioning. The variance among clusters (85.5 %) accounted for the majority of genetic diversity within the N. humilis/quaggulus complex (F CT = 0.86), 0.4 % by the variation among localities within these clusters (F SC = 0.03), and 14.1 % by the variation among each of the localities (F ST = 0.86). The 12 populations identified in the N. humilis/quaggulus complex by the SAMOVA analysis was double the number of major lineages we designate in our phylogenetic analyses (n = 6), because the population analysis identified additional substructure that was not recovered in our phylogenetic hypothesis.
Discussion and conclusions
To address our first objective, we estimated the age of the Norops humilis/quaggulus species complex and evaluated two potential dispersal patterns for this group. The BEAST analysis yielded a mean crown group age of 17.2 Myr BP (range = 14.2–20.6) for the clade. We report this date cautiously because it was calculated from mitochondrial data only. To evaluate the second objective, we used the ancestral range estimation to evaluate dispersal patterns. Using the LAGRANGE output, we infer that the common ancestor of the N. humilis/quaggulus complex originated in Panama before dispersing west to Costa Rica, and then north into Nicaragua and Honduras. The south-to-north pattern and origin in Panama suggests isolation of the ancestor of the N. humilis/quaggulus complex in the Talamancan region of extreme LCA. The divergence between Pacific and Caribbean N. humilis in northern Costa Rica (Chorotega Block) was estimated to be 6.6 Myr BP (range = 4.12–6.94), which corresponds to the estimate of 5.4 Myr BP for the rise of the lower Central American highlands . This uplift represents a potential vicariant event responsible for the separation of the Pacific (lineage 3) and Caribbean lineages (N. humilis lineages 4 and 5 + N. quaggulus). However, the Tilarán range in northern Costa Rica is estimated to have originated around 2 Myr BP , after the present split between Caribbean and Pacific lineages. Sister species are often found on opposite sides of the Central American Highlands [20, 21], and while Caribbean lineages of N. humilis form a paraphyletic group, the fact that one clade is separated by the continental divide is unsurprising. The ancestral area estimation suggests that early ancestors of some of the lineages were present on both sides of the continental divide in Costa Rica and Panama, corresponding to dates prior to the rise of the Central American Highlands.
As in many other taxa ( and sources within), LCA has served as a region of diversification for the Norops humilis/quaggulus complex (once again, distinct from the N. humilis species group). The northward distribution observed here is similar to that found in eleutherodactyline (genera Craugastor ; Pristimantis ) and hylid frogs (Dendropsophus ) that originated in South America and dispersed to Central America prior to the most recent completion of the Isthmus of Panama (3–4 Myr BP). This is also similar to findings in other groups of squamates , although it remains to be seen if this pattern of dispersal is shared by other lizard species.
Our third objective was to examine polyphyly described by others [35, 36] of the N. humilis species group. The lack of support for a monophyletic N. humilis species group is consistent with results from Nicholson  and Poe , further illustrating the extent of convergence in morphological characters of mainland anoles. All analyses agreed in assigning several species of the N. humilis species group into separate areas of the tree. Norops marsupialis, N. tropidonotus, and N. uniformis were placed in areas of the tree distant to a monophyletic N. humilis/quaggulus complex. Initially N. marsupialis was included in this study as a member of the N. humilis/quaggulus complex. Taylor  described N. marsupialis as a subspecies of N. humilis in 1956, and it was not elevated to specific status until 2015 . All of our analyses (Bayesian and ML for each gene region and combined) found support for the specific status of N. marsupialis, and agreed to its placement as sister to a clade containing N. aquaticus and N. woodi (approx. 30 Myr divergent from the N. humilis/quaggulus complex, Fig. 6). Therefore, we confirm N. marsupialis as a distinct species morphologically similar to, but evolutionary distant from N. humilis/quaggulus, in concordance with with Köhler et al. . Morphological convergence within anoles has long been reported, particularly for Caribbean species [27, 62–66] and is further demonstrated by our analysis of the N. humilis species group. Inclusion of the other three members of the group (N. compressicauda, N. notopholis and N. wampuensis) into the molecular phylogeny of Norops may yield further insight on their placement in the phylogeny, but their inclusion is not likely to significantly alter the results obtained here. Additional work within N. tropidonotus may also be necessary to examine the evolution that has occurred in that species, as it occupies a broad geographic range (Köhler 2008 ). Our data suggest that N. tropidonotus contains at least three deep mitochondrial divergences, and could potentially represent multiple cryptic lineages. While N. quaggulus is nested within N. humilis, we do not recommend synonymizing the two species until further work is done to investigate this complex. The deep divergences seen among the N. humilis clades may correspond to cryptic species, and if further work confirms the presence of two or more species, the name N. quaggulus would have priority as the senior synonym.
The SAMOVA results indicate that limited mitochondrial gene flow is occurring among localities, suggesting 12 distinct genetic groupings among our sample localities. Therefore, we conclude that genetic differentiation within the N. humilis/quaggulus complex is significant enough to conclude that (1) population fragmentation has occurred and (2) the complex does not represent a single panmictic population. The isolation, coupled with the high genetic variance, supports all major lineages identified in the Bayesian analyses as being distinct from one another, as well as further subdivision within most lineages. While we do not suggest that the 12 groups correspond to separate species, the presence of at least six well supported, divergent clades within the N. humilis/quaggulus complex demonstrates that deep mitochondrial divergence has occurred within this group, although nuclear evolution appears to be more conserved. This result is similar to several studies on Caribbean anoles, which also display considerable mitochondrial differentiation, with much less diversity in the nuclear DNA [67–70]. This pronounced phylogeographic substructuring may be explained in part, by low vagility in lizards . Deep mitochondrial divergences coupled with conserved nuclear evolution as seen here, may have at least two implications 1) ITS is more slowly evolving than the mitochondrial genome of anoles, which we consider to be a likely scenario given that nuclear DNA is generally regarded as experiencing slower rates of evolution [71–73] and 2). The mitochondrial-nuclear relationships observed here are characteristic of male-biased dispersal [74, 75], indicating that female N. humilis are more philopatric than males as seen in Caribbean anoles [76, 77].
The novel biogeographic pattern for Central American anoles revealed here illustrates a need for further work on mainland Norops. What remains to be tested is whether the south-to-north dispersal route seen in the N. humilis/quaggulus complex is repeated in other Norops groups. In addition, it is important to clarify where the Central American Norops lineage originated, how it dispersed throughout the mainland, and when these events took place. Investigating the phylogeography of other widespread anoles may be highly informative towards understanding other distribution patterns of the Central American herpetofauna. There are several widespread Norops species and species complexes that vary in their ecological roles with corresponding morphological features. These are grouped into designations called ecomodes, which are distinct from ecomorphs, to accommodate mainland anoles (see ). Such an assortment of ecologically diverse anoles may provide good models for testing the biogeographic hypotheses discussed here. Further studies on mainland Norops species are needed to test if the cryptic diversity suggested here is present in other widespread species complexes within the genus.
We would like to thank S. Burton, J. Gubler, D. Laurencio, L. Obando, J. Steffen, D. Steen, J. Sunyer, Y. Svec and J. Townsend for assistance in the collection of specimens and tissues from the field. K. de Queiroz (USNM) and G. Köhler (Senckenberg Museum) provided additional tissues. B. Kubicki, and many other landowners allowed us access to collect specimens on their property. We would like to thank C. Moritz, and two anonymous reviewers at Axios Review for comments on the manuscript. R. Bonett reviewed an earlier draft of this manuscript and provided invaluable feedback. R. Bonett and S. Martin gave technical advice on conducting analyses, and G. Louthan at the Tandy Super Computer in Tulsa, OK provided assistance in supercomputing. Funding was provided by NSF grant DEB 0949359 (KEN), Central Michigan University internal funds from the Office of Research and Sponsored Programs (KEN, JGP, and SH), and the Central Michigan University Honors Program (JGP). Specimens were collected in Costa Rica under Resolucíones 239-2008-SINAC, 040–2009-SINAC, 017-2010-SINAC and 005–2011-SINAC and MINAET Permit no. 029–2011-SINAC, in Nicaragua under DGPN/DB-10–2010 and in Panama under ANAM Scientific Permit No. SEX/A-50-12. We would like to thank all permitting agencies for assisting us in this study. We complied with all applicable Animal Care guidelines (CMU-IACUC # 10–02) and all federal and international permits are on file and available from KEN.
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