Considering evolutionary processes in cycad conservation: identification of evolutionarily significant units within Dioon sonorense (Zamiaceae) in northwestern Mexico

Gutiérrez‐Ortega, José Said; Jiménez-Cedillo, Karen; Pérez‐Farrera, Miguel Ángel; Vovides, Andrew P.; Martínez, José Ignacio Manteca; Molina‐Freaner, Francisco; Imai, Ryōsuke; Tsuda, Yoshiaki; Matsuki, Yasuhiko; Suyama, Yoshihisa; Kajita, Tadashi

doi:10.1007/s10592-018-1079-2

Cited by 16 publications

(15 citation statements)

References 55 publications

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“…1 C-D and G-H). Anatomically, we found striking evidence suggesting that epidermal variation distinguishes the two geographic groups (Gutiérrez-Ortega et al 2018c). Seven out of nine anatomical traits showed significant differentiation.…”

Section: Species Delimitationmentioning

confidence: 66%

“…However, although the proposal of Chemnick et al (1997) to segregate D. sonorense from D. tomasellii was persuasive, the definition of D. sonorense only relies on the traits observed in the holotype of D. tomasellii var. sonorense of De Luca et al (1984), in spite that multiple authors (Sabato & De Luca 1985, Whitelock 2002, Gutiérrez-Ortega et al 2014, 2018c have reported important morphological variation among populations. During our field surveys in Sonora, Mexico, we confirmed such variation, especially when comparing the extremes of the distributional ranges of D. sonorense.…”

Section: Introductionmentioning

confidence: 93%

“…In recent studies (Gutiérrez-Ortega et al 2014, 2018c), we noticed that Dioon populations in Sonora, Mexico, can be grouped according to their habitat associated to geographic distribution. According to the classification of Rzedowski & Huerta (1978), the southern populations occur within the range of the seasonal dry tropical forests of the Floristic Province of the Pacific seaboard of Western Mexico, whereas northern populations co-occur with xerophile scrubland vegetation of the Sonoran Desert Floristic Province of the northwest Pacific seaboard (Gutiérrez-Ortega et al 2018c). This geographic separation was consistent with the variation of leaf and leaflet morphometry.…”

Section: Species Delimitationmentioning

confidence: 99%

“…The variation of chloroplast DNA (cpDNA) revealed two haplotypes (Gutiérrez-Ortega et al 2014, 2018a. One haplotype represents the populations from the Municipality of Álamos, Sonora, and the area of Río Fuerte in Northern Sinaloa; another haplotype is present in the populations from Municipality of Rosario to Sierra de Mazatán in central Sonora (Gutiérrez-Ortega et al 2014, 2018c. This cpDNA differentiation was also tested with population genetic methods (Gutiérrez-Ortega et al 2018c).…”

Section: Species Delimitationmentioning

confidence: 99%

“…One haplotype represents the populations from the Municipality of Álamos, Sonora, and the area of Río Fuerte in Northern Sinaloa; another haplotype is present in the populations from Municipality of Rosario to Sierra de Mazatán in central Sonora (Gutiérrez-Ortega et al 2014, 2018c. This cpDNA differentiation was also tested with population genetic methods (Gutiérrez-Ortega et al 2018c). We produced a dataset of 389 single nucleotide polymorphisms (SNPs) retrieved with the MIG-seq method (Suyama & Matsuki 2015) and evaluated genetic structure with the Structure v. 2.3.3 software (Pritchard et al 2010).…”

Section: Species Delimitationmentioning

confidence: 99%

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<div class="page" title="Page 1"><div class="layoutArea"><div class="column">Species definition of Dioon sonorense (Zamiaceae, Cycadales), and description of D. vovidesii, a new cycad species from northwestern Mexico </div></div></div>

et al. 2018

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The cycad genus Dioon (Zamiaceae) was described by J. Lindley in the 19th century, but most species were discovered during the late 1970s through the mid-1980s. Despite recent efforts to clarify the actual species diversity within the genus, the definition of some species is still problematic. The northernmost populations of the cycad genus Dioon in northwestern Mexico are currently recognised as Dioon sonorense, but important variation among populations has been suggested by multiple authors, and the definition of what is D. sonorense remains unclear. Documented evidence on leaf and leaflet morphology, cuticular and epidermal anatomy, and population genetics across the populations of D. sonorense, as currently circumscribed, suggest that the taxon contains two biological units that should be taxonomically distinguished, given their importance for systematics and conservation. Here we highlight that 1) D. sonorense is defined by the variation exhibited only in populations from southern Sonora and northern Sinaloa, Mexico; 2) the northernmost populations of Dioon in northwestern Mexico represent a new taxon that we describe as Dioon vovidesii. We also discuss the implications of this reassessment for cycad systematics and conservation.

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Section: Species Delimitationmentioning

confidence: 66%

Section: Introductionmentioning

confidence: 93%

Section: Species Delimitationmentioning

confidence: 99%

Section: Species Delimitationmentioning

confidence: 99%

Section: Species Delimitationmentioning

confidence: 99%

See 3 more Smart Citations

<div class="page" title="Page 1"><div class="layoutArea"><div class="column">Species definition of Dioon sonorense (Zamiaceae, Cycadales), and description of D. vovidesii, a new cycad species from northwestern Mexico </div></div></div>

et al. 2018

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Speciation along a latitudinal gradient: The origin of the Neotropical cycad sister pair Dioon sonorense–D. vovidesii (Zamiaceae)

Gutiérrez‐Ortega

Molina‐Freaner

Martínez

et al. 2021

Ecology and Evolution

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Latitude is correlated with environmental components that determine the distribution of biodiversity. In combination with geographic factors, latitude‐associated environmental variables are expected to influence speciation, but empirical evidence on how those factors interplay is scarce. We evaluated the genetic and environmental variation among populations in the pair of sister species Dioon sonorense–D. vovidesii , two cycads distributed along a latitudinal environmental gradient in northwestern Mexico, to reveal their demographic histories and the environmental factors involved in their divergence. Using genome‐wide loci data, we determined the species delimitation, estimated the gene flow, and compared multiple demographic scenarios of divergence. Also, we estimated the variation of climatic variables among populations and used ecological niche models to test niche overlap between species. The effect of geographic and environmental variables on the genetic variation among populations was evaluated using linear models. Our results suggest the existence of a widespread ancestral population that split into the two species ~829 ky ago. The geographic delimitation along the environmental gradient occurs in the absence of major geographic barriers, near the 28th parallel north, where a zonation of environmental seasonality exists. The northern species, D. vovidesii , occurs in more seasonal environments but retains the same niche of the southern species, D. sonorense . The genetic variation throughout populations cannot be solely explained by stochastic processes; the latitudinal‐associated seasonality has been an additive factor that strengthened the species divergence. This study represents an example of how speciation can be achieved by the effect of the latitude‐associated factors on the genetic divergence among populations.

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Do We Need to Identify Adaptive Genetic Variation When Prioritizing Populations for Conservation?

2021

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Considering evolutionary processes in cycad conservation: identification of evolutionarily significant units within Dioon sonorense (Zamiaceae) in northwestern Mexico

Cited by 16 publications

References 55 publications

<div class="page" title="Page 1"><div class="layoutArea"><div class="column">Species definition of Dioon sonorense (Zamiaceae, Cycadales), and description of D. vovidesii, a new cycad species from northwestern Mexico </div></div></div>

<div class="page" title="Page 1"><div class="layoutArea"><div class="column">Species definition of Dioon sonorense (Zamiaceae, Cycadales), and description of D. vovidesii, a new cycad species from northwestern Mexico </div></div></div>

Speciation along a latitudinal gradient: The origin of the Neotropical cycad sister pair Dioon sonorense–D. vovidesii (Zamiaceae)

Do We Need to Identify Adaptive Genetic Variation When Prioritizing Populations for Conservation?

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