• Ctenosaura macrolopha. The IUCN Red List of Threatened Species 2020

      Reynoso, V.H.; Vázquez-Cruz, M.; Rivera-Arroyo, R.C.; Morales-Mávil, J.; Zarza-Franco, E.; Grant, Tandora D. (2020)
      The Sonoran Spiny-tailed Iguana is widely, but unevenly distributed in Sonora, Sinaloa, and a small portion of southwestern Chihuahua, México. In this area, 29% of their habitat has been converted to large- and small-scale agricultural, ranching, and urban uses. It is suspected that there has been a rate of loss in the iguana population correlated to this habitat loss; 20% of this loss occurred more than three generations ago. The population seems to be structured in small, isolated subpopulations, with large concentrations in some areas and absent in others. There are no data available on the population size, trend, or density at any locality. They are able to exist in mildly human-impacted areas, such as the peripheries of crop/ranchlands and suburban areas, however, here they are more vulnerable to predation by free-ranging and feral cats and dogs. Survival of juveniles may be limited as a result. In some regions iguanas are persecuted as a pest, while in others they are not intentionally harmed and can be found in city gardens. Hunting for human food occurs mostly for celebrations and is declining according to local interviews. There are no quantitative data on the level of this take. At the southern end of their range, these iguanas are declining in number as they hybridize with the resident Guerreran Spiny-tailed Iguana (Ctenosaura pectinata). Currently, they are considered Least Concern, but further research on the population size, trends, and threats is needed.
    • Ctenosaura pectinata. The IUCN Red List of Threatened Species 2020

      Reynoso, V.H.; Vázquez-Cruz, M.; Rivera-Arroyo, R.C.; Zarza-Franco, E.; Grant, Tandora D. (2020)
      The Guerreran Spiny-tailed Iguana is widely, but unevenly distributed throughout western México to the southern part of the Tehuantepec Isthmus in Oaxaca. In this area, 36% of their habitat has been converted to large- and small-scale agricultural, ranching, and urban uses. It is suspected that there has been a decline in the iguana population correlated with this habitat loss; the majority of this habitat loss occurred more than three generations ago. The population seems to be structured in isolated subpopulations, with very large concentrations in some areas and absent in others. There are no data available on the population trends or fine-scale density and size information. They are hunted extensively for human food, medicinal uses, and handicrafts, from wild and cultivated sources. Density has been observed to be over 100 times greater in areas where they are not hunted. The level of consumption is not fully known but estimated to be in the tens of thousands annually....