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Is Habitat Suitability Sex-Specific? A Study of the Indian Giant Squirrel (Ratufa indica maxima) in the Western Ghats of India


Affiliations
1 Biopsychology Laboratory, Institution of Excellence, University of Mysore, Mysuru 570 006, India
2 Department of Zoology, Kannur University, Mananthavady Campus, Kannur 670 645, India
3 Manipal Academy of Higher Education, Manipal 576 104, India
4 National Centre for Biological Sciences, GKVK Campus, Bellary Road, Bengaluru 560 065, India
 

Habitat suitability difference between sexes results in sex-specific dispersal. Although this behaviour is one of the key factors in understanding population dynamics, there are limited studies to evaluate it in arboreal species. We studied the distribution of the Indian Giant Squirrel (IGS; Ratufa indica maxima) from a sex perspective. We also evaluated potentiallly suitable habitat types for the species in the Nelliyampathy Reserve Forest, Western Ghats, Kerala, India. We used the sweep survey method to record the distribution pattern of squirrels and analysed the influence of climatic layers and other variables on the distribution using MaxEnt. The study revealed that there was a difference between the sexes in habitat selection. Males preferred more land-use types than females, which were restricted to only certain land-use types. Some of the major factors that determined the distribution of species were distance from urban settlement (50.1%), distance from shade plantation (23.2%), distance from rocky outcrop (9.2%), minimum temperature of the coldest month (9%) and precipitation of the wettest quarter (8.5%). The final MaxEnt model output predicted 49.07% suitable habitat for IGS, of which 45.47% and 34.42% were suitable for males and females respectively, with an overlap of 30.82% between the sexes. We suggest that it would be important to include a sex perspective in species habitat suitability studies in order to gain insights into sex-related habitat specificity and its role in dispersal.

Keywords

Conservation Measures, Distribution Modelling, Habitat Loss, Ratufa indica maxima, Sex-Specific Dispersal.
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  • Is Habitat Suitability Sex-Specific? A Study of the Indian Giant Squirrel (Ratufa indica maxima) in the Western Ghats of India

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Authors

K. Mohan
Biopsychology Laboratory, Institution of Excellence, University of Mysore, Mysuru 570 006, India
Joseph J. Erinjery
Department of Zoology, Kannur University, Mananthavady Campus, Kannur 670 645, India
Arjun Kannan
Manipal Academy of Higher Education, Manipal 576 104, India
Sidharth Srinivasan
National Centre for Biological Sciences, GKVK Campus, Bellary Road, Bengaluru 560 065, India
Mewa Singh
Biopsychology Laboratory, Institution of Excellence, University of Mysore, Mysuru 570 006, India

Abstract


Habitat suitability difference between sexes results in sex-specific dispersal. Although this behaviour is one of the key factors in understanding population dynamics, there are limited studies to evaluate it in arboreal species. We studied the distribution of the Indian Giant Squirrel (IGS; Ratufa indica maxima) from a sex perspective. We also evaluated potentiallly suitable habitat types for the species in the Nelliyampathy Reserve Forest, Western Ghats, Kerala, India. We used the sweep survey method to record the distribution pattern of squirrels and analysed the influence of climatic layers and other variables on the distribution using MaxEnt. The study revealed that there was a difference between the sexes in habitat selection. Males preferred more land-use types than females, which were restricted to only certain land-use types. Some of the major factors that determined the distribution of species were distance from urban settlement (50.1%), distance from shade plantation (23.2%), distance from rocky outcrop (9.2%), minimum temperature of the coldest month (9%) and precipitation of the wettest quarter (8.5%). The final MaxEnt model output predicted 49.07% suitable habitat for IGS, of which 45.47% and 34.42% were suitable for males and females respectively, with an overlap of 30.82% between the sexes. We suggest that it would be important to include a sex perspective in species habitat suitability studies in order to gain insights into sex-related habitat specificity and its role in dispersal.

Keywords


Conservation Measures, Distribution Modelling, Habitat Loss, Ratufa indica maxima, Sex-Specific Dispersal.

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DOI: https://doi.org/10.18520/cs%2Fv125%2Fi1%2F66-72