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A widespread problem: cryptic diversity in the Libyan jird
Zoological Studies volume 53, Article number: 33 (2014)
The Libyan jird, Meriones libycus, is described as occurring from Morocco to the Mongolian plateau. Three subspecies are known from morphological determinations but not genetic data. We used museum collection locations to create a niche model of the most likely suitable habitat for this species within its potential extent. Using samples collected from the Kingdom of Saudi Arabia, we examined genetic diversity including available samples from China and Tunisia, providing the first genetic overview of this species.
Mitochondrial cytochrome b data showed that genetic differentiation between Arabian and other sampling locations of M. libycus is less than the lineage separation seen in Meriones meridianus and greater than that in Meriones tamariscinus. The Arabian lineage investigated here is clearly distinct from the Chinese Meriones libycus erythrourus and Tunisian Meriones libycus syrius, the latter subspecies being previously suggested to occur in the sampling area.
We suggest further investigation to ascertain whether the lineage represented here is Arabian Meriones libycus arimalius or a different lineage entirely. We further question the reliability of previous morphological descriptions for producing specific determinations in Meriones and related taxa.
Much mammalian nomenclature has remained since pre-molecular classifications based on pelage and other morphology as well as limited information about ecology and distribution. Distinction between similar species can be problematic, particularly in arid habitats where colouration and habits are restricted and are more likely to converge on similar solutions. When the isolation of lineages does occur, it is typically gradual in nature, and contingent on levels of gene flow (Nosil ) with speciation processes being identifiable through genetic and morphological approaches (e.g. Jansen van Rensburg et al. ; Ryan et al. ). Pulses of speciation events are also seen (Erwin ) particularly in speciose genera such as murids (Conrad and Cook ), complicating species relationships. Convoluted patterns of lineage separation have led to the term ‘species complex’ which often best describes these macro-spatial dynamics where clear species delimitation is problematic (e.g. Eurasian distribution of Pipistrelles; Hulva et al. ). It is therefore essential to consider molecular relationships in the context of other information such as distribution. With the additional data on environmental conditions, further insight into habitat requirements and preferences of an organism can be gained (Phillips ).
Ecological niches are suggested to present long-term constraints on species' distribution (Martinez-Meyer et al. ). Distribution information is often based on few collected samples or sightings, but novel methods are facilitating predictions of range extents based on ecological data (Pearson et al. ). Modeling species requirements in a predictive context has become a useful tool in directing conservation science (e.g. Schwartz ). Part of knowing a species distribution involves understanding the dynamics of the organism, extending into the understanding of demography and dispersal (Schurr et al. ). As such, differential patterns of habitat suitability shown through a niche modeling approach might potentially identify geographic (and hence phylogenetic) discontinuities. An interesting biogeographic region for this reason is the Arabian Peninsula, the northern base of which connects with both Africa and Asia, exhibiting wide variation in habitat across its width. Although historical conditions of the Arabian Peninsula were once moist (e.g. hippopotamus remains have been found in the Rub al’ Kali desert in Saudi Arabia; Holm ), current conditions reflect a recent arid trajectory since the early Holocene (Engel et al. ). Alongside diminished terrestrial connections to the other continents (e.g. from Africa into southern Arabia; Delany ), the peninsula has proven a fertile land for the isolation and subsequent evolution of unique lineages, and high levels of endemism are seen across a number of taxonomic groups (Mallon ). This Arabian habitat discontinuity is reflected in niche models (Colaccico et al. ), yet many species exist whose range overlaps this entire region from Africa into Asia (Harrison and Bates ).
The vast majority of mammalian species are not widespread, with range extents affected by trends according to latitude and species density (Pagel et al. ); if range is inversely related to species density in this way it may be expected that those species found in arid regions, typically occupied by relatively few species, might have comparatively wide distributions. Even if this is the case, some desert-dwelling species are described as occurring over unusually large regions; The Libyan jird, Meriones libycus Lichtenstein (), is one such species, recorded as present from Morocco to the Mongolian Plateau (IUCN International Union for Conservation of Nature ; type locality ‘Libyan desert’). There has been suggestion that M. libycus exists as subspecies either side of the Euphrates (West = Meriones libycus syrius; East = Meriones libycus erythrourus), with a further putative subspecies in Saudi Arabia and Oman (Meriones libycus arimalius; Harrison and Bates ). Pavlinov et al. () distinguish Meriones arimalius as its own species designation as does Zhang et al. () for Meriones erythrourus. But no genetic evidence has yet been presented for these designations, and Wilson and Reeder () regarded M. erythrourus as a synonym for M. libycus. The explanation of this wide range of a single species likely lies in the fact that many taxonomic relationships between rodent taxa are uncertain. Superfamily Muroidea contains over a quarter of all mammal species (e.g. Chevret and Dobigny ), and diversity in these overlooked genera is often undescribed. Current interest in species such as M. libycus are based on its response to environmental variables (e.g. desert adaptation (Belhocine et al. ), pollution (Adham et al. ), and potential importance as a host for various zoonotic diseases (Rassi et al. , Yavar et al. )). Unravelling the level, direction, and limits of gene flow and the resultant partitioning of sub-species (and even full species) is likely to be highly influential in these areas of study.
The purpose of this study is to determine whether morphological similarity and lack of data have resulted in the current seemingly ‘blanket’ determinations for Meriones species, with particular consideration of M. libycus. Using a niche modelling approach, we make an approximation of habitat suitability of M. libycus across its described range. Using available cytochrome b sequence data and individuals sampled in this study, we make genetic comparisons between two widely separated geographic locations in this species and the subspecies M. l. erythrourus, and place this in the context of other Meriones taxa. Specifically, we ask the following: (1) Does the described range encompass a continuous stretch of suitable habitat, or is it possible to identify regions of isolated habitat likely to show similar genetic isolation, such as the Arabian Peninsula? (2) Is the genetic variation seen in M. libycus consistent with that found within other Meriones species? (3) What are the conservation implications of the results from the niche modelling and the genetic diversity for conservation management?
Ethical approval for this study was given by the Animal Use and Care Committee of the University of Pretoria under project number EC046-1. Permission for sample collection was granted by the Saudi Wildlife Authority.
Geographic coordinates were taken from the IUCN species database for 112 separate Meriones libycus sample locations (IUCN International Union for Conservation of Nature ; see Figure 1). To avoid confounded location condition data, a 10-km minimum was imposed on sample proximity.
The niche modelling approach was performed through the MAXENT (Phillips ) approach. An initial test model was run for all 19 Worldclim bioclimatic variables (WorldClim ; Additional file 1) as well as altitude and ecosystem land cover (USGS ). In accordance with the appropriate use of explanatory variables (Warren and Seifert ), those with the lowest contribution to the model (<1%) were excluded (bioclimatic variables 2, 5, 7, 10, 13, 14, 15, and altitude). The remaining 13 variable layers (bioclimatic variables 1, 3, 4, 6, 8, 9, 11, 12, 16, 17, 18, 19, and land cover) were then used to make a predictive model of occurrence (area considered lat/long; 40.51, −15.03 to 11.70, 74.36). Ten iterations of the model were run under the cross-validation setting. Mean area under the curve (AUC) and variable influence were calculated for the model. Inferences of suitable habitat were used to predict occurrence probability with 90% of the presence data used to train the model.
Genetic sampling, sequencing, and phylogenetic analysis
Samples were collected from three sites in and around Riyadh city and from a location of approximately 300 km to the west, in the Kingdom of Saudi Arabia (Figure 1). DNA extraction was performed from earlobe tissue using Qiagen extraction reagents and separate spin columns (Epoch Life Science, Missouri City, TX, USA). The mitochondrial cytochrome b (cytb) gene was amplified using the L15162 (Irwin et al. ) and CytbLibR (5′-TTGTCCTCAATGATTCCTCGA-3′, designed for this study). The nuclear recombination activating gene 2 (RAG2) was amplified using F1INT/R1 primers (Baker et al. ). PCR was run for a single cycle of 3 min at 94°C with 40 cycles comprising denaturing at 94°C for 30 s, annealing at 48/50°C for 30 s, and extension at 72°C for 45 s. Reverse sequences were generated for confirmation. Sequence data was cleaned and aligned in BioEdit (Hall ) and combined with samples already available. Nucleotide substitutions and translation into amino acids was performed through MEGA5 (Tamura et al. ). The most appropriate nucleotide substitution model to apply for the subsequent analyses was determined according to the Akaike Information Criterion (AIC; Akaike ) using JMODELTEST (Posada ). Neighbour joining trees were constructed and compared between gene regions separately using MEGA5. The supports for the phylogenetic relationships obtained by the neighbour-joining method were evaluated by the bootstrap analysis (1,000 replicates). Maximum parsimony haplotype networks were calculated using the TCS (Clement et al. ) application. The application TCS was used to draw parallel haplotype networks from the cytb data in M. libycus, Meriones meridianus, and Meriones tamariscinus.
Time since divergence of all available Meriones species, as well as all geographically separate M. libycus lineages were calculated using sequence data through the BEAST application (Drummond and Rambaut ). Both species models (Yule; Birth-death) were tested in addition to all options for the clock models (Strict, Relaxed lognormal, Relaxed exponential, and Random local), with likelihoods compared in Tracerv1.5 (Rambaut and Drummond ) over 1 × 108 iterations. The model with the highest likelihood was run for 1 × 109 iterations (sampling every 1 × 105 with 10% burn-in samples removed). The molecular clock was calibrated using the fossil-dated split between Mus and Rattus of 16 million years ago (mya; normal distribution, SD = 1.5) as calculated by an averaging approach across multiple calibration points (Douzery et al. ). Due to the low reliability of the fossil record within Gerbillinae, no additional internal calibration point could be used in our analysis (Tong ). To improve the accuracy of the dating approach, we compared both mitochondrial cytb and nuclear RAG2 genes for common nodes.
The final model describing the occurrence of M. libycus gave a mean AUC of 0.89 (SD = 0.05). The greatest parameter contribution was precipitation of the coldest quarter (e.g. the driest season in the Arabian Peninsula) which had an optimum range of 0 to 20 mm. The least contribution was made by the land cover classification. To identify whether discontinuities in occurrence probability corresponded with described subspecies limitations (Harrison and Bates ), these were compared with the results of the niche model (Figure 1).
Sequence characteristics and phylogenetic analysis
A total of 941 bp of cytb and 836 bp of RAG2 sequence data were generated for 15 and 21 individuals, respectively. Within the Arabian M. libycus, eight haplotypes were determined from cytb with nucleotide diversity in cytb of 0.004 and 8 parsimony informative sites. A single haplotype was identified in the Arabian RAG2 gene. Sequence data were combined with both cytb and RAG2 sequences already available (sequence details and accession numbers in Table 1). The most appropriate mutational models were determined to be TIM with invariable sites for cytb and TIM3 for RAG2 (−ln likelihoods 4621 and 2716, respectively). A neighbour joining cytb tree showed strong support (≥97% consensus bootstrap support) for three lineages within M. libycus (Additional file 2: Figure S1). The maximum parsimony haplotype network showed that the Arabian cytb haplogroup is 49 substitutions distant from the closer Chinese M. l. erythrourus which is then nine substitutions distant from the Tunisian Meriones libycus libycus (Figure 2). The haplotype networks for each of the Meriones species M. libycus, M. meridianus, and M. tamariscinus were constructed for comparison (Figure 2). Statistical parsimony analysis using a 95% connection limit resulted in the separation of all nodes above 15 substitutions into separate subnetworks. Extending the connection limits to 100 substitutions allowed the substitutional distances between subnetworks to be shown.
For the Drummond and Rambaut () approach, the highest likelihood for cytb was obtained from the Birth-death model using a random local clock, and for the RAG2 was the Yule species model, using a strict molecular clock. Dating comparisons between genes of the Meriones libycus/unguiculatus split, showed a more ancient estimate for the cytb gene compared to RAG2 with median values of 8.3 and 4.6 mya (95% confidence interval (CI) = 5.5 to 11.6 and 1.0 to 5.3, respectively; Figure 3). Within M. libycus, the cytb estimate of divergence for the Arabian lineage was 3.2 mya (95% CI = 1.9 to 4.7), and between the Tunisian and Chinese M. l. erythrourus estimated at 0.38 mya (95% CI = 0.15 to 0.67).
Range and habitat continuity in the Libyan jird
The application of niche modeling in this case was intended to both identify a correspondence between the suggested range of M. libycus (IUCN International Union for Conservation of Nature ), and identify if range breaks aligned with described subspecies limitations (Harrison and Bates ). The resultant map shows that there are no strong habitat breaks that might be used to explain previously hypothesised subspecies delimitations between M. l. syrius and M. l. erythrourus (Figure 1). The riparian system of the Euphrates would have provided continuous habitat with opportunities for rafting when the river was in spate, as proposed for other murids (Prager et al. ). A widespread of continuous habitat is seen from Morocco to China, with some narrowing through Libya and Egypt. The model identifies good potential for isolated suitable habitat in south eastern Algeria and to a lesser extent in northern Chad. Some habitat discontinuity also exists within the Arabian Peninsula, with a decrease in suitability towards the southern extent. There appears to be a very weak correspondence of the niche model to available habitat in the mid to lower Arabian Peninsula, particularly in the region corresponding to the area of occurrence of M. l. arimalius. This would be the case if M. l. arimalius was occupying a narrower set of environmental conditions than those on which the niche model was based. Such a case might be expected if heterogeneity of available habitat was restricted, promoting specialisation for narrow preference ranges accordingly (Gilchrist ).
Intra-specific variation in Meriones species
The cytochrome b data demonstrated strong stratification within M. libycus according to geographic origin. Despite a greater proximity between Tunisia and Arabia, these locations were the most genetically distant (>5.2% substitutions), the former being far closer to the Chinese representative (>1.0% substitutions). To test the hypothesis that M. libycus exists as a single widely distributed species, we compared it with two other available Meriones species, M. meridianus and M. tamariscinus (Figure 2). Despite M. libycus being from the most geographically disparate sample locations of the three species, the Arabian/Tunisian split displayed intermediate differentiation relative to haplogroup differentiation in the other species. The work of Gu et al. () described their recommendation for sub-specific allocation based on the lineage separation within M. tamariscinus (1.4% substitutions). Similarly, Ito et al. () recommend the elevation of haplogroups in M. meridianus to sub-specific or even up to specific status (6.7% and 7.5% substitutions). The division into sub-networks at 95% probability has been proposed as evidence for cryptic species diversity (Hart and Sunday ), and is seen here for all divisions above 15 substitutions. This approach supports an additional division within M. tamariscinus, but not a division within M. libycus between Chinese and Tunisian locations. It is important to note that previous species allocation in Meriones was based on morphological characters, and Ito et al. () undermine this approach by showing the presence of ‘Meriones chengi’ within M. meridianus as being merely a divergent colour morph. The literature suggested that all M. libycus found to the west of the Euphrates and above the southern Arabian break determined for M. l. arimalius, is the subspecies M. l. syrius (Harrison and Bates ). The evidence for the Chinese and Tunisian populations being separate subspecies is weak based on the data shown in this study. The Arabian samples in this study are clearly genetically distinct from the Tunisian M. l. syrius in contradiction of the IUCN (International Union for Conservation of Nature) () distribution database and Harrison and Bates (). It is unknown whether these Arabian individuals therefore represent M. l. arimalius, or if there is even further genetic variation to be discovered in the Arabian peninsula. The most parsimonious explanation would be that the northern range extent of M. l. arimalius was underestimated and needs to be moved northwards.
It is likely that the geographic extent of M. l. arimalius is greater than currently recognised and it would be interesting to know if there is indeed an isolation-by-distance relationship with more northern M. libycus or if a northern discontinuity occurs, as indicated by the niche model, towards the base of the peninsula. The clearly distinctive genetic composition of the Arabian haplogroup currently suggests comparable differentiation to other small mammals at a full-species level (e.g. Microtus voles, 4.2% to 5.7% substitutions; (Krystufek et al. ). This is further supported by the molecular dating for the cytb gene which gives a median estimate of the Arabian split as 3.2 mya, although comparable nodes in the RAG2 gene tree are more conservative, suggesting that this value may be as low as approximately 1.6 mya. This is comparable to the speciation rates for other rodent taxa; the per lineage diversification rates in Rattus have been estimated at up to 3.0 per million years (Rowe et al. ). Qualitatively speaking, this divergence within M. libycus predates the Meriones crassus/Meriones rex divergence. The Arabian representatives shown here represent a clearly distinct lineage separate from M. libycus elsewhere. More extensive sample coverage is necessary before taxonomic reorganisation is considered. Closer consideration of these species is likely to also be accompanied by complete reorganisation of the potentially paraphyletic Meriones group (see Ito et al. ).
Conservation implications of diversity in the Libyan jird
There are currently 17 species of jird recognised by the IUCN Red list (2011). The genetic distinction of the Arabian M. libycus lineage suggests that it should be considered separately from the lineages present in the other regions. Where this genetic distinction represents local specialisation to sandy conditions as suggested by Harrison and Bates (M. l. arimalius) is unknown. Behavioural data do support Arabian M. libycus being specialised relative to M. rex, through exhibition of more narrow responses to changes in the circadian rhythm (Alagaili et al. ), which may explain the magnitude of divergence from other M. libycus. Although there is no evidence for a general decline of M. libycus, Meriones species are known as agricultural pests and as such are subject to persecution (e.g. Mian et al. ). Whatever the taxonomic designation of Saudi Arabian M. libycus (arimalius), it represents a unique genetic entity and therefore of notable conservation value.
Whilst being clear that finer scale sampling could add to the consideration of M. libycus, we showed that even without this, we can begin to gain insight into such species using niche modelling and genetic techniques. We show the need for genetic characterisation of M. libycus, as is required in the other jird species mentioned here. We conclude that necessary as they were initially, we have transcended the need for ‘blanket’ morphological species descriptions and can begin to look at the well-established genetic marker regions for help in redefining both genealogical and geographical boundaries within Meriones. We also associate the putatively unsuitable habitat moving down into, and including, the Arabian Peninsula with the high separation between the Saudi Arabian and other M. libycus. The most important environmental variable in the niche model was precipitation in the coldest quarter. Only by identification of each evolutionarily significant unit can any conservation measures really be considered and applied. Once these units are defined, their ecology, range, and persistence will begin to reveal whether there are vulnerabilities associated with their habitat utilisation and the process of conservation management can begin.
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Funding was provided by the Deanship of Scientific Research at the King Saud University through the research group project number RGP_VPP_020, as well as the DST-NRF SARChI Chair for Mammal behavioural ecology and physiology. O Mohammed is recognised for the design of the CytbLibR primer.
The authors declare that they have no competing interests.
TB and NB conceived the design and implementation of the study and helped to draft the manuscript. NB provided ethical clearance and permissions for non-destructive sampling. AA conducted sampling, including permissions from Saudi Arabian authorities, and provided research equipment and facilities. TB conducted laboratory procedures, niche modelling, and sequence analyses. All authors read and approved the final mansucript.
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Bray, T.C., Alagaili, A.N. & Bennett, N.C. A widespread problem: cryptic diversity in the Libyan jird. Zool. Stud. 53, 33 (2014) doi:10.1186/s40555-014-0033-3
- Meriones libycus