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Patterns in abundance and diversity of faecally dispersed parasites of tiger in Tadoba National Park, central India.

Marathe RR, Goel SS, Ranade SP, Jog MM, Watve MG - BMC Ecol. (2002)

Bottom Line: Across all genera of parasites variance scaled with the square of the mean and there was a significant positive correlation between prevalence and abundance.There was no significant association between different types of parasites.If we assume each of the clusters to represent individual tigers that were sampled repeatedly and that resident tigers are more likely to be sampled repeatedly, the presumed transient tigers had significantly greater parasite loads than the presumed resident ones.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Microbiology, Abasaheb Garware College, Pune 411 004, India. rahul_marathe@yahoo.com

ABSTRACT

Background: Importance of parasites in ecological and evolutionary interactions is being increasingly recognized. However, ecological data on parasites of important host species is still scanty. We analyze the patterns seen in the faecal parasites of tigers in the Tadoba National Park, India, and speculate on the factors and processes shaping the parasite community and the possible implications for tiger ecology.

Results: The prevalence and intensities were high and the parasite community was dominated by indirect life cycle parasites. Across all genera of parasites variance scaled with the square of the mean and there was a significant positive correlation between prevalence and abundance. There was no significant association between different types of parasites.

Conclusions: The 70 samples analyzed formed 14 distinct clusters. If we assume each of the clusters to represent individual tigers that were sampled repeatedly and that resident tigers are more likely to be sampled repeatedly, the presumed transient tigers had significantly greater parasite loads than the presumed resident ones.

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Across all species of parasites the variance in propagule densities increased with the square of the mean densities as indicated by a slope close to two of a double log plot.
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Figure 1: Across all species of parasites the variance in propagule densities increased with the square of the mean densities as indicated by a slope close to two of a double log plot.

Mentions: Parasites from 8 genera were detected in the 57 positive samples (table 1). The conservative estimate of the number of biotypes based on propagule morphology was 12 and a liberal one was 21. The frequency distribution of parasite densities in all the samples was highly aggregated as indicated by the large variance to mean ratio. The variances for all types of parasites were one or two orders of magnitude greater than the mean and tended to increase with the mean. Similar to the observations of McCallum [25] on protozoan parasite densities in fish the double logarithmic plot of means and variances was linear with a slope close to two (fig 1). The variances thus scaled linearly with the square of the mean. A similar pattern was noted by Watve [17] across a range of host species. The consistency of this pattern in the three unrelated situations is curious but as yet we do not know the factors that make the parasite variance scale with the square of the mean.


Patterns in abundance and diversity of faecally dispersed parasites of tiger in Tadoba National Park, central India.

Marathe RR, Goel SS, Ranade SP, Jog MM, Watve MG - BMC Ecol. (2002)

Across all species of parasites the variance in propagule densities increased with the square of the mean densities as indicated by a slope close to two of a double log plot.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC111199&req=5

Figure 1: Across all species of parasites the variance in propagule densities increased with the square of the mean densities as indicated by a slope close to two of a double log plot.
Mentions: Parasites from 8 genera were detected in the 57 positive samples (table 1). The conservative estimate of the number of biotypes based on propagule morphology was 12 and a liberal one was 21. The frequency distribution of parasite densities in all the samples was highly aggregated as indicated by the large variance to mean ratio. The variances for all types of parasites were one or two orders of magnitude greater than the mean and tended to increase with the mean. Similar to the observations of McCallum [25] on protozoan parasite densities in fish the double logarithmic plot of means and variances was linear with a slope close to two (fig 1). The variances thus scaled linearly with the square of the mean. A similar pattern was noted by Watve [17] across a range of host species. The consistency of this pattern in the three unrelated situations is curious but as yet we do not know the factors that make the parasite variance scale with the square of the mean.

Bottom Line: Across all genera of parasites variance scaled with the square of the mean and there was a significant positive correlation between prevalence and abundance.There was no significant association between different types of parasites.If we assume each of the clusters to represent individual tigers that were sampled repeatedly and that resident tigers are more likely to be sampled repeatedly, the presumed transient tigers had significantly greater parasite loads than the presumed resident ones.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Microbiology, Abasaheb Garware College, Pune 411 004, India. rahul_marathe@yahoo.com

ABSTRACT

Background: Importance of parasites in ecological and evolutionary interactions is being increasingly recognized. However, ecological data on parasites of important host species is still scanty. We analyze the patterns seen in the faecal parasites of tigers in the Tadoba National Park, India, and speculate on the factors and processes shaping the parasite community and the possible implications for tiger ecology.

Results: The prevalence and intensities were high and the parasite community was dominated by indirect life cycle parasites. Across all genera of parasites variance scaled with the square of the mean and there was a significant positive correlation between prevalence and abundance. There was no significant association between different types of parasites.

Conclusions: The 70 samples analyzed formed 14 distinct clusters. If we assume each of the clusters to represent individual tigers that were sampled repeatedly and that resident tigers are more likely to be sampled repeatedly, the presumed transient tigers had significantly greater parasite loads than the presumed resident ones.

Show MeSH