Genetic structure and ecological niche segregation of Indian gray mongoose (Urva edwardsii) in Iran

Abstract

Combining genetic data with ecological niche models is an effective approach for exploring climatic and nonclimatic environmental variables affecting spatial patterns of intraspecific genetic variation. Here, we adopted this combined approach to evaluate genetic structure and ecological niche of the Indian gray mongoose (Urva edwardsii) in Iran, as the most western part of the species range. Using mtDNA, we confirmed the presence of two highly differentiated clades. Then, we incorporated ensemble of small models (ESMs) using climatic and nonclimatic variables with genetic data to assess whether genetic differentiation among clades was coupled with their ecological niche. Climate niche divergence was also examined based on a principal component analysis on climatic factors only. The relative habitat suitability values predicted by the ESMs for both clades revealed their niche separation. Between‐clade climate only niche comparison revealed that climate space occupied by clades is similar to some extent, but the niches that they utilize differ between the distribution ranges of clades. We found that in the absence of evidence for recent genetic exchanges, distribution models suggest the species occurs in different niches and that there are apparent areas of disconnection across the species range. The estimated divergence time between the two Iranian clades (4.9 Mya) coincides with the uplifting of the Zagros Mountains during the Early Pliocene. The Zagros mountain‐building event seems to have prevented the distribution of U. edwardsii populations between the western and eastern parts of the mountains as a result of vicariance events. Our findings indicated that the two U. edwardsii genetic clades in Iran can be considered as two conservation units and can be utilized to develop habitat‐specific and climate change‐integrated management strategies.

Predicting the habitat suitability and niche dynamics of two Ziziphus species in response to climate change

“…Two randomization tests were applied to determine whether there was climatic niche divergence or conservation between the two species: niche equivalency (or identity) and niche similarity (or background). The niche equivalency test aimed to assess whether the climatic niches of the two species in their respective geographic regions were similar (Broennimann et al, 2012;Hemami et al, 2020;Oboudi et al, 2021). However, since the niche equivalency test did not consider the environmental background, the niche similarity test was conducted in two directions.…”