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BUTTERFLY DIVERSITY IN THE THREE SELECTED AREAS IN DHAKA CITY, BANGLADESH

The diversity of butterfly species was studied from January to June 2015 in the three selected areas, viz. Ramna Park, Jagannath University Campus, and Baldha Garden in Dhaka city, Bangladesh. A total 75 species of butterfly belonging to 42 genera under 8 families were recorded from the study areas during the study period. Of them, 52 species (6253 individuals) of 8 families were found in the Ramna Park, 37 species (1430 individuals) of 7 families in the Jagannath University Campus and 20 species (320 individuals) of 6 families in the Boldha Garden. In these three study areas, 17 species, 14 genera and 6 families were in common. At the Ramna Park, the highest species richness included the family Lycaenidae (21.15%, 11 spp.) followed by Papilionidae (17.31%, 9 spp.), Pieridae (17.31%, 9 spp.), Nymphalidae (17.31%, 9 spp.), Hesperiidae (13.46%, 7 spp.), Danaidae (7.69%, 4 spp.), Satyridae (3.85%, 2 spp.), and the lowest was in the family Acriidae (1.92%, 1 spp.). At the Jagannath University Campus the highest number of species were recorded in the family Lycaenidae (21.62%, 8 spp.) and Hesperiidae (21.62%, 8 spp.) followed by Pieridae (18.92%, 7 spp.), Papilionidae (13.51%, 5 spp.), Nymphalidae (10.81%, 4 spp.), Danaidae (10.81%, 4 spp.), and the lowest was in Satyridae (2.70%, 1 spp.). The topmost butterfly species were recorded in the family Pieridae (25%, 5 spp.) followed by Lycaenidae (20%, 4 spp.), Nymphalidae (20%, 4 spp.), Papilionidae (15%, 3 spp.), and the lowest from the family Hesperiidae (10%, 2 spp.) and Danaidae (10%, 2 spp.) at the Baldha Garden. The maximum butterfly species were found in February to June (51 spp.), February (34 spp.), and April (16 spp.), and the lowest were in January (46 spp.), June (21 spp.) and January (8 spp.), respectively for the Ramna Park, Jagannath University Campus and the Baldha Garden. The peak of the population observed in May (n =1285), March (n = 325), and May (n = 71), and the lowest was in January (n = 662), June (n = 145) and January (n = 21), respectively for the Ramna Park, Jagannath University Campus, and Baldha Garden. The Shanon’s Diversity Index (H) and Simpson’s Index (λ) indicated high butterfly diversity at the Ramna Park (H = 3.68, λ = 0.03), Jagannath University Campus (H = 3.20, λ = 0.06) and Baldha Garden (H = 2.50, λ = 0.13), respectively. The high Species Evenness in the Ramna Park (E = 0.93), Jaganath University Campus (E = 0.89) and the Baldha Garden (E = 0.84) indicated that the species were evenly distributed. The calculated Sorenson’s Coefficient (CC) was 0.47, which indicates that these three communities have quite a bit of overlap or similarity.


INTRODUCTION
Butterflies are scaled wing insects, which belong to the order Lepidoptera, class Insecta and phylum Arthropoda (Nimblkar et al. 2011). They are large and diverse group of animals that are a conspicuous part of virtually all the world's terrestrial ecosystems (Singh 2011). There are more than 17,500 butterflies species under 17 families in the world and 90% of them have been documented (Robbins and Olper 1997). Among them, 1501 species have been recorded from India, 651 species from Nepal, 242 species from Srilanka, 237 species from Japan, 1182 species from Malaysia (Gaonkar 1996). A total of 305 butterflies species under 10 families have been reported from Bangladesh (Bangladesh, I. U. C. N. 2015).
Butterflies have been regarded as the sign of beauty and elegance in nature (Rafi et al. 2000). They are important aspects of ecosystem for their interaction with plants as pollinators and herbivores. They occupy a vital position or disproportionate effect on other organisms in different ecosystems and their occurrence and diversity has been invoked as an indicator of biological diversity and good health (Aluri andRao 2002, Schmucki et al. 2015). Butterflies are keystone species of environmental changes as they are sensitive to habitat degradation and climate change (Kunte 2000) due to their rapid life cycle than higher animals and hence can be quicker to react to small changes in their environment (Lafontaine 1997).
Butterfly distribution, diversity, and abundance depend upon the key factors such as the greatest diversity of plants, habitats, topography, and climates (Sarder et al. 2016). Butterfly species are generally abundant in tropical area means tropical forest, Shal forest, and tropical rainforest. In Bangladesh very insufficient and limited works have been done on butterfly species diversity, species composition and its distribution pattern (Bashar 2014). Hence, in various ecological pockets of primary and disturbed (human dominated) habitat of butterfly fauna, it requires proper exploration (Sarder et al. 2016). Many species of butterflies depend on relic vegetation for survival, especially in urban areas (Blair 1999). Dhaka is the capital of Bangladesh and its climate is very favorable for butterfly species diversity having a tropical Savanna climate. However, no detailed work has done on the diversity of butterfly in Dhaka city. The aim of the present study was to evaluate the diversity, species richness and evenness and community similarity of butterfly fauna of the three selected places of the Dhaka city.

Study area:
The study was conducted in the following 3 selected areas in Dhaka city: Ramna Park: It is located at the center of the Dhaka city. The geological coordinates are Latitude: 23°44'14.70" N Longitude: 90°24'03.4" E. The total area is 68.50 acres. There are 71 species of flowering trees, shrubs, perennials, and annuals, 41 species of forestry, 36 species of fruit-bearing plants, 33 species of medicinal plants, and 11 other species. Jagannath University Campus: It is located at the southern part of the Dhaka city. The geological co-ordinates are Latitude: 23°42'32.4" N and Longitude: 90°24'38.16" E. Total area is 7.5 acres. It can be compared with the overall vegetation trend of the Dhaka city. Most of its areas are covered with the concrete buildings while the botanical garden, life, and earth science faculty are the oasis of this area. The variety of species stretches from shrubs to medicinal plant and flower-bearing trees.
Baldha Garden: It is located at the south eastern part of the Dhaka city. The geological co-ordinates are Latitude: 23°43'06'' N and Longitude: 90°25'04'' E. It is 3.15 acres compact area with variety of vegetation. There is a wide variation of floral species occurred in the Baldha garden especially in the psyche section. There are about 600 species of plants from around the world cultured here.
Materials: Sweep net, camera, collecting jar and polythene bag, forceps and needle, envelopes, permanent ink pen, label paper and magnifying glass were used as physical materials. The biological materials were butterflies and the related plants.
Sampling and Identification: Butterflies were observed during sunny days at a constant speed from 7 am to 2 pm (BST) four days in a month through walking transect (Caldas and Robbins 2003). Butterfly Identification was carried out by using the keys developed and used by Marshall de Niceville (1883), Bingham (1905), Evans (1932), Wynter-Blyth (1957), Talbot (1978), Bashar (2014), and Encyclopedia of fauna (Ahmed et al. 2009).

Diversity Analysis:
The study used Shannon's Diversity Index (H) (Shannon and Weiner 1949) and Simpson's Index (λ) (Simpson 1949) as models as a measure of diversity. The equations for the two indices: Where, p is the proportion (n/N) of individuals of one particular species found (n) divided by the total number of individuals found (N), is the natural log, Σ is the sum of the calculations and S is the number of species. Optimum values of H are generally between 1.5 and 3.5 in most ecological researches, and the index is rarely greater than 4. Shannon's Diversity Index is mathematical measurement to define community composition (number of species) and commonness of species in a community. It increases as both the richness and the evenness of the community increase (Shannon and Weiner 1949). Opposite to this, the Simpson's Index (λ) is the mathematical representation of the similarity index. The range of  is from 0 to 1 (Simpson 1949). Higher the index means lower the diversity. It is the strength of dominance, because it weights towards the abundance of the most common species and varies inversely with species diversity (Whittaker 1972).

Simpson's Index of Diversity (1-λ):
It is a measure of diversity. The probability of two randomly selected individuals in a community belongs to different categories e.g. species. The value of 1-λ ranges between 0 and 1, where, high scores (close to 1) show high diversity and low scores (close to 0) show low diversity (Simpson 1949).

Simpson's Reciprocal Index (1/λ):
The relative biodiversity of a community can be measured by it. It can be used to compare communities to identify intrinsic qualities. A high index value indicates a stable site with many different richness and low competition. A low index value shows a site with a few potential niches where only a few species dominate. The index value may alter in response to the ecological interference (MacDonald et al. 2017).

Species evenness (E):
It refers to how close in number each species an environment is. The equation is: E = . The range of E is from 0 to 1.The value of E trends to 0 indicates that the species is more dominant in a community, E nears to 1 refers to evenly distributed (Shannon and Weiner 1949).
Community Similarity: It is measured by Sorenson's Coefficient (CC). The equation is: Sorenson's Coefficient (CC) = , Where C is the number of species the three communities have in common, S1 is the total number of species found in community 1, S2 is the total number of species found in community and S3 is the total number of species found in community 3 (Sorensen 1948). Sorenson's coefficient gives a value between 0 and 1, the closer the value is to 1, the more the communities have in common. Entire community overlap is equal to 1; entire community dissimilarity is equal to 0 (Sorensen 1948).

RESULTS AND DISCUSSION
A total of 8003 butterflies of 75 species belonging to 42 genera under 8 families were recorded from the Ramna Park, Jagannath University Campus and Baldha Garden in Dhaka city (Table 1, 2 and 3). Of them, 52 species (6253 individuals) under 8 families were found in the Ramna Park (Table 1), 37 species (1430 individuals) belongings to 7 families in the Jagannath University Campus (Table 2) and 20 species (320 individuals) of under 6 families in the Baldha Garden (Table 3). In these three study areas, 17 species, 14 genera and 6 families were in common.
About 430 species of butterfly are known to Bangladesh (Bashar 2014). Out of the above estimated species only 75 species of 8 families were recorded from the three selected areas in the Dhaka city in this study. Present investigation revealed that there were no new species, these areas were excellent for the occurrence of common species availability, Sarder et al. (2016) stated that in disturbed habitats and anthropogenic affected sites species richness was The maximum population was recorded in the month of May (20.55%) followed by April (19.22%), March (18.58%), June (17.21%), February (13.85%) and the minimum of January (10.59%) (Fig. 6). increased but the uniqueness was less. These results are in good agreement with Padhey et al. (2012).
that the highest diversity of these three areas is in the Ramna Park, and the lowest is in the Baldha Garden, since the value of λ decrease with the increasing diversity (Ludwing and Reynolds 1988). The Shannon-Wiener Index of diversity has demonstrated some sort of contradictory outcome, interference habitat or forest gaps have higher butterfly diversity than that in closed canopy or dense forests (Wood and Gillman 1998 Month butterfly diversity of which the topmost diversity was in the Ramna Park, and the lowest was in the Baldha Garden.The Simson's Reciprocal Index is also shown high butterfly diversity of these areas. According to the index values the maximum and minimum diversity was found as same as Simpson's Index of Diversity Evenness index provides and insight into the relative abundance of the species in the community. The value of E tend to be zero indicates that the species become more dominant in a community (Sanjayan et al. 1995). In this study, the value of E (0.93) for the Ramna Park is so high while the Jagannath University (E=0.89) and Baldha Garden (E=0.84) also have high value of E that indicates the species are evenly distributed.
Community Similarity among the Ramna Park, Jagannath University Campus and Baldha Garden is shown in Table 4. The value of Sorenson's Coefficient (CC) of these communities is 0.47. The range of it is from 0 to 1, the closer the value is to 1, the more the communities have in common (Sorensen 1948). According to Sorenson's Coefficient these three communities have quite a bit of overlap or similarity.

CONCLUSION
The present research has revealed butterfly biodiversity and prepared checklists in the study areas. This study revealed 75 butterfly species belongings to 42 genera under 8 major families. On the basis of the data, conservation of wide range of indigenous butterfly fauna in these small human dominated landscapes might be a good model for maintaining most favourable habitat within fragments.