Species diversity and abundance patterns of epiphytic orchids in Aralam Wildlife Sanctuary in Kerala, India

Main Article Content

Jis Sebastian
https://orcid.org/0000-0001-9750-7040
Durairaj Kathiresan
https://orcid.org/0000-0001-7666-2498
Giby Kuriakose
https://orcid.org/0000-0002-7044-3187

Abstract

Species diversity and abundance patterns of epiphytic orchids were studied in Aralam Wildlife Sanctuary, in the Western Ghats of northern Kerala. Habitats sampled were wet evergreen (EVEG), montane wet evergreen (MEVG), moist deciduous (MDEC), and semi evergreen (SEVG), on a gradient of altitude from 60 to 1,589 m. Selective tree scanning on linear line transects was deployed (n= 40) across spatial units. A total of 39 orchid species were recorded. Rarefied species richness was maximum in the EVEG (20) habitat. Best suited rank abundance models were analysed for epiphytic orchids in each habitat and checked for significant differences. Bootstrap and Jackknife-1 estimators and species accumulation curves suggested higher species richness than observed, therefore more effort in sampling was needed in order to record all epiphytic orchids of the area. The difference in species richness between habitat types was not statistically significant (ANOVA). 38% of recorded epiphytic orchid species were endemic.

Article Details

How to Cite
[1]
Sebastian, J., Kathiresan, D. and Kuriakose, G. 2021. Species diversity and abundance patterns of epiphytic orchids in Aralam Wildlife Sanctuary in Kerala, India. Journal of Threatened Taxa. 13, 8 (Jul. 2021), 19060–19069. DOI:https://doi.org/10.11609/jott.4852.13.8.19060-19069.
Section
Communications

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