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Journal of Tropical Life Science : International Journal of Theoretical, Experimental, and Applied Life Sciences
Published by Universitas Brawijaya
ISSN : 20875517     EISSN : 25274376     DOI : -
Core Subject : Agriculture, Social,
Agriculture, Biological Sciences & Forestry Environmental Science
The Journal of Tropical Life Science (JTLS) provides publication of full-length papers, short communication and review articles describing of new finding or theory in living system, cells and molecular level in tropical life science and related areas. The journal publishes articles that report novel findings of wide Tropical Life system phenomenon in the areas of biodiversity, agriculture, fisheries, health, husbandry, forestry and environmental technology. JTLS has 1 volume with 3 issues per year.
Arjuna Subject : -
Articles 15 Documents
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Search results for , issue "Vol 11, No 2 (2021)" : 15 Documents clear
Artificial propagation and embryonic growth in Stinging catfish, Heteropneustes fossilis (Bloch, 1794) using S-GnRHa (salmon gonadotropin releasing hormone analogue) Araf, Tasrick; Hossain, Alal; Chowdhury, Gourab; Hossain, Mohammad Amzad; Rahman, Md. Arifur; Iqbal, Mohammed Mahbub
Journal of Tropical Life Science Vol 11, No 2 (2021)
Publisher : Journal of Tropical Life Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/jtls.11.02.03

Abstract

An experiment was performed to observe the potentiality of synthetic hormone analogue in artificial propagation i.e., the embryonic and larval development of Heteropneustes fossilis. Broodfish were injected with S-GnRHa according to the following concentration: 1, 2.5 and 5 ml kg-1 of body weight (BW) to females and 0.5, 1.125 and 2.5 ml kg-1 BW to males, in treatment groups T1, T2 and T3, respectively each with three replicates. The fishes were ovulated at about 10-11 hours after the hormone injection. Result showed the highest fertilization (83.11±1.36) and hatching rate (89.56±1.04) in T2, whereas ovulation rate was 100% in all treatment groups. First cleavage was observed in 30 minutes of post-fertilization. Embryonic developmental period sequentially for 2-cell, 4-cell, 8-cell, 16-cell, 32-cell, 64-cell, Morula, Blastula, Gastrula, somatic formation, yolk-plug, twisting movement and pre-hatching were 00:30, 00:45, 01:10, 01:30, 02:00, 02:30, 03:00, 04:00, 06:40, 09:00-18:00, 19:00, 20:00-21:00 and 22:00 hours, respectively. Hatching occurred after 23:00 hours of fertilization. Finally, the current result suggested that S-GnRHa might be an effective synthetic hormone in artificial propagation of H. fossilis.
Potential and Performance of Accelerated Solvent Extraction (ASE) in Obtaining Bioactive Compounds from Bee Propolis as Compared with Other Extraction Methods Mojica, Elmer-Rico E.; Charland, Jozlyn M; Deocaris, Custer C; Micor, Jose Rene L
Journal of Tropical Life Science Vol 11, No 2 (2021)
Publisher : Journal of Tropical Life Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/jtls.11.02.08

Abstract

Propolis is a natural resinous substance collected by honeybees from buds and exudates of trees. The material has attracted much attention in recent years as a functional food component since it possesses various biological properties, including antimicrobial, antioxidative, and anti-ulcer properties. In this study, the performance of accelerated solvent extraction (ASE) was assessed and compared with varying methods of extraction: soaking (maceration), ultrasonication, and microwave-assisted methods. Gas chromatography-mass spectrometry (GC-MS) and other spectroscopic techniques, such as absorbance and fluorescence, were employed to assess the efficiency in the extraction of natural products. The antioxidant activity and phenolic content of the different extracts were also determined. Results showed samples obtained from the microwave method showed the highest yield. Some issues and recommendations on the application of ASE for extracting natural products from bee propolis were discussed.
ANALYSIS OF FUNCTIONAL LEAF TRAIT VARIATION AMONG THE DOMINANT UNDERSTOREY SPECIES IN THE PINE FOREST OF MORNI HILLS, PANCHKULA, HARYANA. Jakhar, Somveer; Dhiman, Himanshi; Saharan, Harikesh
Journal of Tropical Life Science Vol 11, No 2 (2021)
Publisher : Journal of Tropical Life Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/jtls.11.02.13

Abstract

Functional diversity is an essential concept in the field of functional ecology. It refers to the relative abundance, range and value of the functional traits present in a given community or ecosystem. Plant functional traits (leaf traits, stem traits, root traits etc.) create a link between ecosystem processes and plant physiology, and thus offer a powerful means to study the global change on vegetation dynamics and ecosystem processes. When plant species grow in different environments, their physiological and functional traits get modify due to change in site specific conditions. In the present study, leaf functional traits (leaf size-LS, specific leaf area-SLA, leaf dry matter content-LDMC, leaf nitrogen content-LNC, leaf phosphorus content-LNC and leaf nitrogen to phosphorus ratio-N:P) of twelve dominant understorey species (6 shrubs  and 6 herbs) were examined in the Pine forest of Morni Hills range of lower Shivaliks, Haryana, India. During the study, the maximum value of leaf size was obtained for Murraya koenigii and Cynoglossum zeylanicum; while the maximum value of LDMC was obtained for Toxicodendron parviflorum and Dicliptera chinensis among shrubs and herbs respectively. Other than this, highest value of SLA, LPC and LNC were calculated for Parthenium hysterophorus among shrubs and Oxalis corniculata among herbs. The calculated values were also found to be significantly correlated among the selected plant species.
DNA Barcoding for Selected Mangrove-Based Estuary Fishes from Way Kambas National Park, Lampung Province, Indonesia Ariyanti, Yanti; Rini, Ika Agus; Oktaviani, Indah; Leksikowati, Sovia Santi
Journal of Tropical Life Science Vol 11, No 2 (2021)
Publisher : Journal of Tropical Life Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/jtls.11.02.04

Abstract

Over the past decade, DNA barcoding has provided new insight into fish ecology and biosystematics and led to new species' discovery. DNA barcoding is a method for the recognition and identification of species using short, standardised DNA fragments. The correct taxonomic identification of species is critical for the assessment and monitoring of biodiversity. This study applied DNA barcoding techniques to identify selected fish species from a mangrove-based estuary in Way Kambas National Park, Lampung Province, Indonesia. The gene encoding cytochrome c oxidase subunit I (COI) was amplified and bi-directionally sequenced from 22 specimens. The resulting 680 base pairs (bp) sequence was used to identify species, obtain phylogenetic information, and analyse genetic distances. A neighbour-joining tree was constructed based on the mitochondrial COI gene using the Kimura two-parameter model. This study also exhibits conservation status for those identified species. Our findings will facilitate future studies of fish species diversity in mangrove estuary-based ecosystems and provide preliminary data in policymaking in conservation areas such as National Park.
Population flux of the house sparrow Passer domesticus Linnaeus 1758 in Chinnamanur town, Uthamapalayam taluk of Theni district, Tamil Nadu, India Meeran, Mohamed; Marjuk, Syed; Byrose, Mohammed; Arivoli, Subramanian; Tennyson, Samuel; Fathima, Syedali
Journal of Tropical Life Science Vol 11, No 2 (2021)
Publisher : Journal of Tropical Life Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/jtls.11.02.09

Abstract

A thorough study of house sparrow behaviour and its population is essential to revive its population status which is the need of the hour. Therefore, the nature of sparrow population, their nests, water and food sources, interspecific competitions and noise pollution were taken into consideration in the present investigation, which documented its first research carried at Chinnamanur town, Uthamapalayam taluk of Theni district, Tamil Nadu, India. The study period was divided into summer and winter seasons and the survey was carried out for a period of nine months from April 2019 to December 2019 by point count and ebird data method. A total of 542 house sparrows were counted of which 250 was present in summer and 292 in winter. The overall house sparrow population in Chinnamanur town, related to the summer and winter seasons exhibited the range of correlation coefficient value to be 0.94 indicating a very strong positive correlation. Above all, the present study revealed that mobile phone towers were not the main reason for the decline of house sparrows, rather it was loss of habitat and food, urbanization, noise pollution, interspecific competition and conversion of agricultural lands into plots.

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