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3 documents found tagged richness [X]
  • Title
    Egg parasitoids from the subfamily Scelioninae (Hymenoptera: Platygastridae) in irrigated rice ecosystems across varied elevational ranges in southern India
    Type
    Journal Article
    Description
    Platygastridae (Hymenoptera) is the most abundant family of parasitic Hymenoptera in rice ecosystems in southern India. Members belonging to the subfamily Scelioninae were assessed in rice ecosystems along three elevation ranges, a highland (737m), midland (54m) and lowland (1.5m) in northcentral Kerala (southern India) during the pre-flowering to the milky-grain stage of paddy. Malaise traps were employed as the standard specimen collection methodology with collections made for four weeks, using two malaise traps per field, from August 2008 to January 2009, serviced once a week. The study recorded a total of 198 individuals belonging to 38 species in 21 genera. The species diversity, richness, evenness as well as beta diversity were computed for the three sites along with ANOVA and it was concluded that, contrary to other studies on different taxa, elevation did not have any major effect on the overall diversity patterns in Platygastridae even though there was a difference in species assemblages.
    Attribution
    M. Shweta & K. Rajmohana, Journal of Threatened Taxa, Vol 8, No 6 (2016); pp. 8898–8904 http://dx.doi.org/10.11609/jott.2061.8.6.8898-8904
  • Title
    Microcrustacea (Crustacea: Branchiopoda) of Deepor Beel, Assam, India: richness, abundance and ecology
    Type
    Journal Article
    Description
    Plankton samples collected from two sampling stations of Deepor Beel, an important floodplain lake of Assam and a Ramsar site of India, revealed 51 species of Microcrustacea and showed qualitative dominance of Cladocera (45 species). Microcrustacea comprised a significant quantitative component (45.6 � plus or minus 5.8 and 50.8 � plus or minus 4.5 %) of zooplankton and exhibited bimodal and trimodal annual patterns with peaks during winter. Cladocera > Copepoda are important quantitative groups. ANOVA registered significant variation in species richness and abundance of Microcrustacea over time and between stations. Richness and abundance were inversely correlated with water temperature and rainfall, and positively correlated with specific conductivity and dissolved oxygen. Multiple regression registered significantly higher cumulative effects of ten abiotic factors on these two parameters. Our results are characterized by higher species diversity, higher evenness and lower dominance of Microcrustacea and show lack of distinct quantitative importance of individual species.
    Attribution
    Sharma B.K., Sharma S. (2009). Journal of Threatened Taxa 8(1) pp. 411-418; doi:10.11609/JoTT.o2169.411-8
  • Title
    Diversity of microcrustacea (Crustacea: Branchiopoda) of Loktak Lake, a Ramsar site, Manipur, India
    Type
    Journal Article
    Description
    Microcrustacea of Loktak Lake (collected during Nov. 2002-Oct. 2004) reveal 57 species and show qualitative dominance of Cladocera (51 species). They indicate monthly richness ranging between 33�plus or minus 6 and 32� plus or minus 6 species, record 51.7-82.3 and 53.6-90.0% community similarities during two years respectively, and follow trimodal annual patterns with peaks during winter. The microcrustaceans (112� plus or minus 17 and 124� plus or minus 13 n/l) form an important quantitative component (45.7� plus or minus 4.9 and 43.3� plus or minus 3.7 %) of zooplankton and show broadly trimodal annual patterns with peak abundance during winter. Cladocera > Copepoda mainly contribute to their quantitative variations. ANOVA registers significant monthly variations of microcrustacea richness and significant annual and monthly variations of their abundance. Richness is positively correlated with dissolved oxygen and is negatively correlated with rainfall, hardness, chloride and total dissolved solids while abundance is negatively correlated with pH only. Multiple regressions indicate higher cumulative effect of 15 abiotic factors on richness and abundance. Our results indicate no definite periodicity of richness and abundance of microcrustacea or their constituent groups during two annual cycles and are characterized by their higher species diversity, higher evenness and lower dominance.
    Attribution
    Sharma B.K., Sharma S. (2009). Journal of Threatened Taxa 11(1) pp. 541-548; doi:10.11609/JoTT.o2231.541-8