0 votes
in ALBERTA CHAPTER OF UNION PARTY OF CANADA by (23.6k points)
Butterflies are very good pollution indicators and their diversity are good signs of a healthy environment. They depend on preferred host and nectar plants during their larval and adult stages respectively and the lack of these sources indicate degraded habitats with low <a href="http://www.ncbi.nlm.nih.gov/pubmed/20021046">Targetmol's AKBA</a> species richness.Ongoing unplanned anthropogenic activities like habitat modification results in loss of biodiversity. Increased urbanization and habitat degradation is one of the major cause   of decrease in butterfly species richness, diversity and abundance. The study was conducted with the following objectives. km radius from the main vehicular roads.The number of butterfly species were recorded when weather conditions were suitable for butterfly activity. When necessary butterflies were netted for identification and then released.In each of the five sites, spots were chosen randomly by sampling which were equally spaced transect tracts for each site.Butterflies were captured using hand net, photographed where identification was not possible directly and then released at the point of capture.Density of shrubs and flowering shrubs were estimated by transect walk along the study site and the number of shrubs and nonflowering shrubs were noted down.Species richness is the number of species seen at each site and is directly comparable among sites as sampling effort and area were equal at all sites. The minimum diversity being at the most densely populated urban. Rarefaction analysis based on relative abundances of various butterfly species showed that in most of the sites sampling efforts in the present study could record most of the butterfly species present in respective areas.Rarefaction curve shows that species diversity recorded during the study has reached a plateau in all the sites.As found in rarefaction analysis, the sampling exercise could record most of the species sampled at all the five sites studied.In the rest of the two urban sites no exclusive species were found.The three least developed sites that is suburban, suburban and rural site and had butterfly species that were unique to those sites.Regression analysis show a linear fit between vegetation cover and butterfly species diversity at different sites.Regression analysis show a linear fit between the flowering shrub density and butterfly diversity at the studied sites.CONCLUSION A total of butterflies belonging to species were recorded.The grassland type was primary determinant of species richness and composition. Both the urban sites had the minimum abundance of butterfly as it was densely populated.Similar to the above result, found that butterfly species richness peaked at sites of intermediate levels of urban development and the butterfly abundance decreased as the sites became more urbanized.Increasing human disturbance was strongly and negatively correlated with butterfly species richness. Thus butterflies are especially good indicators of changes in species diversity that occur that occur as humans develop the landscape and are excellent indicators of urbanization in particular. The butterfly community was sensitive to changes brought about by development and demonstrated this when individuals disappeared from sites of increasing development.Of the total species observed, species were noticeably absent from the disturbed urban sites. Similar to our result, found that species were patchily distributed along the gradient, suggesting that butterflies respond differentially to disturbance in the landscape.

Please log in or register to answer this question.

Union Party Of Canada
...