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Suresh, S.
- Tree Climbing and Temporal Niche Shifting: An Anti-Predatory Strategy in the Mangrove Crab Parasesarma plicatum (Latreille, 1803)
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Authors
Affiliations
1 Division of Conservation Biology, Jawaharlal Nehru Tropical Botanic Garden and Research Institute, Thiruvananthapuram, 695 562, IN
2 University of Kerala, Kariavattom, Thiruvananthapuram 695 581, IN
1 Division of Conservation Biology, Jawaharlal Nehru Tropical Botanic Garden and Research Institute, Thiruvananthapuram, 695 562, IN
2 University of Kerala, Kariavattom, Thiruvananthapuram 695 581, IN
Source
Current Science, Vol 111, No 7 (2016), Pagination: 1201-1207Abstract
Parasesarma plicatum, a common sesarmid crab in mangrove habitats of India, always climbs onto the mangrove vegetation during high tide. We studied whether this temporal niche shifting of the crab is an anti-predatory strategy against potential predators that invade their habitat during high tide. We studied the difference in density of this crab on the forest floor and vegetation during low and high tides in three selected study sites. Ex situ experiments were also conducted using the crab and a predatory fish simulating the habitat. The study confirmed that all the crabs climbed onto the vegetation from the forest floor during high tide and came down to the forest floor during low tide. Regression analysis revealed a positive correlation between water level and the height climbed by crabs on vegetation. Crabs completely migrated from sites which were fully submerged during high tide to nearby areas where mangrove trees and the shrub Acanthus ilicifolius provided them ample refuge above water level. Ex situ experiments showed that though P. plicatum could remain under water and feed in starved conditions, they climbed onto the vegetation above water level so as to seek refuge in the presence of predatory fish, Lutjanus argentimaculatus. Therefore, it is inferred that the tree-climbing character exhibited by P. plicatum is a strategy to escape from predators that invade their habitats during high tide inundation and flooding.Keywords
Anti-Predatory Strategy, Mangrove, Parasesarma plicatum, Temporal Niche Shifting, Tree Climbing.Full Text
References
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- Leaf Litter Translocation and Consumption in Mangrove Ecosystems: the Key Role Played by the Sesarmid Crab Neosarmatium malabaricum
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PDF Views:111
Authors
Affiliations
1 Division of Conservation Biology, Jawaharlal Nehru Tropical Botanic Garden and Research Institute, Thiruvananthapuram 695 562, IN
2 University of Kerala, Kariavattom, Thiruvananthapuram 695 581, IN
1 Division of Conservation Biology, Jawaharlal Nehru Tropical Botanic Garden and Research Institute, Thiruvananthapuram 695 562, IN
2 University of Kerala, Kariavattom, Thiruvananthapuram 695 581, IN
Source
Current Science, Vol 110, No 10 (2016), Pagination: 1969-1976Abstract
Nutrient cycling in mangrove forests is strongly linked to detrital processing of leaf litter, as compared to direct herbivorous consumption. Sesarmid crabs play a key role in detrital pathways in mangrove forests by processing a large amount of leaf litter produced in the ecosystem. We studied the rate of leaf litter translocation and consumption by a sesarmid crab, Neosarmatium malabaricum, through an ex situ experiment simulating field conditions. We supplied weighed senescent leaves of Aegiceras corniculatum, Avicennia officinalis, Excoecaria agallocha and Rhizophora mucronata to the crab. When provided separately, the crab translocated leaf litter of E. agallocha the maximum, and that of Rhizophora mucronata the minimum to the burrows. When litter mixed together was provided, the rate of translocation was the highest. The crabs consumed up to 80.24% of the litter that they translocated. We found this species capable of translocating 4.39 ±1.68 g of leaf litter m-2 per day and that its population had the potential to translocate 1.81 times more leaf litter than the ecosystem produced, based on comparisons of translocation rate, density of N. malabaricum and leaf litter production in the study area. Our experiments emphasize the key role played by this crab in detrital pathways of mangrove ecosystem.Keywords
Aegiceras, Avicennia, Detrital Pathways, Excoecaria, ex Situ Experiments, Leaf Litter Translocation, Mangroves Crabs, Neosarmatium malabaricum, Nutrient Cycling, Rhizophora.Full Text
- Volume Holographic Gratings in Acrylamide-Based Photopolymer to Provide Selective Light as an Added Input for Improving the Performance of Dye-Sensitized Solar Cells
Abstract Views :310 |
PDF Views:90
Authors
Affiliations
1 Department of Optoelectronics, University of Kerala, Thiruvananthapuram 695 581, IN
2 Department of Physics, Amrita Vishwa Vidyapeetham University, Amrithapuri, Kollam 690 525, IN
1 Department of Optoelectronics, University of Kerala, Thiruvananthapuram 695 581, IN
2 Department of Physics, Amrita Vishwa Vidyapeetham University, Amrithapuri, Kollam 690 525, IN
Source
Current Science, Vol 114, No 11 (2018), Pagination: 2267-2272Abstract
A transmission holographic grating with good storage life and diffraction efficiency is fabricated in an indigenously prepared red-sensitive photopolymer. Stability retained by the photopolymer transmission holographic grating in its diffraction efficiency upon long-term exposure to temperature indicates the suitability of the fabricated photopolymer holograms in solar applications. Holographic elements diffract different wavelengths to different regions and dye sensitized solar cells (DSSCs) can absorb the desired range of wavelengths from the diffracted light. Hence, we exploit this property of the holographic grating to enrich the performance of DSSCs by enhancing its input and output power, particularly under low photometric conditions. Improvement in maximum power output of DSSCs is observed in all cases, with a maximum enhancement of about 100% for the lowest level of input intensity.Keywords
Diffraction Efficiency, Dye Sensitized Solar Cells, Photopolymer, Transmission Holographic Grating.Full Text
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