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Sandfly species diversity in association with human activities in the Kani tribe settlements of the Western Ghats, Thiruvananthapuram, Kerala, India.

Ranganathan S, Swaminathan S - Mem. Inst. Oswaldo Cruz (2015)

Bottom Line: With further increase in altitude, species diversity, S and J were low.Though the relative abundance of sandflies decreased with increase in altitude, the influence of altitudinal variation could not be attributed to determine sandfly diversity, since the number of sampling units were not uniform at all the altitudinal gradients due to nonavailability of suitable resting shelters.Sandfly species showed great aggregation at 0-300 m altitude interval, where not only the number of settlements were maximum (n = 19), but also the environmental conditions favoured sandfly abundance due to the concentration of tribal settlements, human dwellings and his activities.

View Article: PubMed Central - PubMed

Affiliation: Vector Control Research Centre, Indian Council of Medical Research, Pondicherry, Pondicherry, India.

ABSTRACT
Sandfly prevalence in the Kani tribe settlements of Western Ghats in India was investigated. A total of 1,279 sandflies comprising 17 species was obtained. Sandfly abundance showed a negative correlation (r = -0.97, p = 0.003) with increase in altitudinal ranges from 0-1,000 m. When sandfly samples were grouped according to landscape characteristics of the location, the estimated Shannon-Weiner index (H) and species richness index (S) were high and species evenness index (J) was low in settlements located at 0-300 m altitudinal range. On the contrary, the values of H and J were high, while S was low at 301-600 m altitudinal range. With further increase in altitude, species diversity, S and J were low. Though the relative abundance of sandflies decreased with increase in altitude, the influence of altitudinal variation could not be attributed to determine sandfly diversity, since the number of sampling units were not uniform at all the altitudinal gradients due to nonavailability of suitable resting shelters. Sandfly species showed great aggregation at 0-300 m altitude interval, where not only the number of settlements were maximum (n = 19), but also the environmental conditions favoured sandfly abundance due to the concentration of tribal settlements, human dwellings and his activities.

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sandfly species Shannon-Weiner index (H) in relation to increase inaltitude in southernmost part of the Western Ghats.
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f02: sandfly species Shannon-Weiner index (H) in relation to increase inaltitude in southernmost part of the Western Ghats.

Mentions: The sandfly species diversity as indicated by the value of H, J and S among thesettlements located at various altitudinal gradients (Figs 2-4) showed significantdifferences (r = -0.97, p = 0.003). In settlements located at the altitudinal rangebetween 0-300 m, both species diversity and J were relatively low and S was high. On theother hand, species diversity and J were high and S was low at altitudinal range 301-600m. With further increase in altitude (> 601 m) species diversity, J and S were verylow.


Sandfly species diversity in association with human activities in the Kani tribe settlements of the Western Ghats, Thiruvananthapuram, Kerala, India.

Ranganathan S, Swaminathan S - Mem. Inst. Oswaldo Cruz (2015)

sandfly species Shannon-Weiner index (H) in relation to increase inaltitude in southernmost part of the Western Ghats.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4489447&req=5

f02: sandfly species Shannon-Weiner index (H) in relation to increase inaltitude in southernmost part of the Western Ghats.
Mentions: The sandfly species diversity as indicated by the value of H, J and S among thesettlements located at various altitudinal gradients (Figs 2-4) showed significantdifferences (r = -0.97, p = 0.003). In settlements located at the altitudinal rangebetween 0-300 m, both species diversity and J were relatively low and S was high. On theother hand, species diversity and J were high and S was low at altitudinal range 301-600m. With further increase in altitude (> 601 m) species diversity, J and S were verylow.

Bottom Line: With further increase in altitude, species diversity, S and J were low.Though the relative abundance of sandflies decreased with increase in altitude, the influence of altitudinal variation could not be attributed to determine sandfly diversity, since the number of sampling units were not uniform at all the altitudinal gradients due to nonavailability of suitable resting shelters.Sandfly species showed great aggregation at 0-300 m altitude interval, where not only the number of settlements were maximum (n = 19), but also the environmental conditions favoured sandfly abundance due to the concentration of tribal settlements, human dwellings and his activities.

View Article: PubMed Central - PubMed

Affiliation: Vector Control Research Centre, Indian Council of Medical Research, Pondicherry, Pondicherry, India.

ABSTRACT
Sandfly prevalence in the Kani tribe settlements of Western Ghats in India was investigated. A total of 1,279 sandflies comprising 17 species was obtained. Sandfly abundance showed a negative correlation (r = -0.97, p = 0.003) with increase in altitudinal ranges from 0-1,000 m. When sandfly samples were grouped according to landscape characteristics of the location, the estimated Shannon-Weiner index (H) and species richness index (S) were high and species evenness index (J) was low in settlements located at 0-300 m altitudinal range. On the contrary, the values of H and J were high, while S was low at 301-600 m altitudinal range. With further increase in altitude, species diversity, S and J were low. Though the relative abundance of sandflies decreased with increase in altitude, the influence of altitudinal variation could not be attributed to determine sandfly diversity, since the number of sampling units were not uniform at all the altitudinal gradients due to nonavailability of suitable resting shelters. Sandfly species showed great aggregation at 0-300 m altitude interval, where not only the number of settlements were maximum (n = 19), but also the environmental conditions favoured sandfly abundance due to the concentration of tribal settlements, human dwellings and his activities.

Show MeSH