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Nayar, T. S.
- Smithia agharkarii Hemadri - a New Synonym for Smithia bigemina Dalz
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Indian Forester, Vol 112, No 4 (1986), Pagination: 353-356Abstract
Smithia agharkarii Hemadri, a new taxon, was erected aegregating it from the most allied Smithia bigemina Dalz. And allied S.blanda Var. racemoss Baker and S.hirsuta Dalz. Based on (a) unequal pair of bracteoles (b) larqer Joints of fruits. After a critial analysis of these characters for their taxonomic reliability on account of the study of, live as well as dried specimens of the above Smithia complex It was Concluded that these characters Were of highly Intergrading nature among the population of Smithia and they collectively or separately were not even found to merit a variety status. S.agharkarii Hemadri is, thus, reduced here to the synonym of S. bigemina Dalz.
- Occurrence of Voacanga Grandlfolia (Miq.) Rolfe (Apocynaceae) in India and the Asian Continent
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1 Tropical Botanic Garden and Research Institute, Trivandrum, IN
1 Tropical Botanic Garden and Research Institute, Trivandrum, IN
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Nelumbo - The Bulletin of the Botanical Survey of India, Vol 32, No 1-4 (1990), Pagination: 167-168Abstract
No Abstract.Full Text
- Tree Climbing and Temporal Niche Shifting: An Anti-Predatory Strategy in the Mangrove Crab Parasesarma plicatum (Latreille, 1803)
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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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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