OBSERVATION ON POPULATION ECOLOGY AND BIOENERGETICS OF CHORTHIPPUS ALMORANUS UVAROV (ORTHOPTERA : ACRIDIDAE)

OBSERVATION ON POPULATION ECOLOGY AND BIOENERGETICS OF CHORTHIPPUS ALMORANUS UVAROV (ORTHOPTERA : ACRIDIDAE)
Manoj K. Arya-1*, Prachi Tamta-1, Dayakrishna-1 and Prakash C. Joshi-2
1-Department of Zoology, D.S.B. Campus, Kumaun University, Nainital-263002 (Uttarakhand), India
2-Department of Zoology and Environmental Sciences, Gurukul Kangri University, Haridwar-249404 (Uttarakhand), India
[Corresponding author E-mail-1*: dr.manojkumar19@rediffmail.com]
Received: 21-12-2016 Accepted: 20-02-2017

Abstract:
Present investigations were undertaken to know the population ecology and bioenergetics of Chorthippus almoranus Uvarov in field and laboratory studies. This grasshopper species occur on forest floor vegetation of Chir Pine, Oak and Oak-Mixed forest at an altitude of 1750- 2450 meters in the Binsar Wildlife Sanctuary of Kumaun hills and constitutes one of the important consumers in those forest ecosystems. In the present study, population density varied from 0.33 ha-1 (January) to 8.33 ha-1 (July) and biomass of varied from 89.61 mg ha-1 (January) to 826.21 mg ha-1 (September). Across the study population density and biomass of grasshoppers was significantly influenced by temperature, relative humidity and rainfall. Biomass, consumption and egesta were significantly greater in females than in males across all post embryonic developmental stages. Assimilation rates were slightly lower in females than in males but, tissue growth was higher in females than in males. The food utilization efficiencies such as approximate digestibility (AD), efficiency of conversion of digested food (ECD) and efficiency of conversion of ingested food (ECI) were calculated. On an average, AD was recorded as 58.28% for males and 43.20% for females. The males are more efficient in assimilating the consumed food than females. The average ECD for males was found to be 19.48% while for females, it was 44.81%.The average ECI for males and females was 10.78% and 19.23%, respectively.

Keywords: Chorthippus almoranus, Binsar Wildlife Sanctuary, biomass

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