Population ecology, threats, status and conservation of natural populations of Crotalaria longipes – an endangered endemic legume

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Research Paper 01/04/2012
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Population ecology, threats, status and conservation of natural populations of Crotalaria longipes – an endangered endemic legume

M. Jayanthi
J. Bio. Env. Sci.2( 4), 1-9, April 2012.
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Crotalaria longipes is an endangered plant endemic to Kolli hills. It is one of the fifteen species listed in the Red Data Book of Indian plants. Initially field visits were made to locate the plant at Kolli hills. The general field observations revealed that the distribution of this species is limited to a very narrow range, the Kolli Hills, Tamil Nadu, India. C. longipes was found in association mostly with Lantana camara, and Solanum pubescens. The extent of occurrence and the area of occupancy of C. longipes were calculated from the map. The extent of occurrence was found to be 24-sq. km. and the area of occupancy was approximately 4 sq. km. Two populations of Kolli hills, were taken up for a detailed population study. Hundred plants from both populations were sampled. It was found that nearly twice the number of seedlings was found in population 2 than in population 1. There were no plants of height more than 4 m in population 2. Seekuparaipatti population was denser than the Solakadu population. Mature plants were 13 and 22 in number in Solakadu and Seekuparaipatti populations respectively. The leptidoteran insects associated with these plants indicated to the presence of pyrrolizidine alkaloids in these plants. Germination of seeds at the site was very low. Seeds were brought to the laboratory and acid scarified which helped in germination. The germination percentage obtained was 85.3 and 86.6 in population 1 and population 2 respectively. The gene bank stored seed (germinated after scarification after a year) exhibited a slight reduction in the germination (79 and 81 in population 1 and 2 respectively). The status of C. longipes was analyzed using the IUCN criteria (Mace and Stuart,1994). The probability of extinction was calculated based on the population reduction, extent of occurrence, number of mature individuals and the population estimates. The plant was given the status of critically endangered. Human influences on populations were also studied. The local perception about this plant was studied and the locals were encouraged to conserve this plant.


Batisse M. 1982. The biosphere reserve: a tool for environmental conservation and management. Environmental Conservation 9, 101-111.

Burdon JJ. 1980. Variation in disease resistance within a population of Trifolium repens. Journal of Ecology 68, 717 – 736.

Burgess MA. 1994. Cultural responsibility in the preservation of local economic plant resources. Biodiversity and Conservation 3, 126-136.

Daniels RJR, Jayanthi M. 1996. Biology and conservation of endangered plants: The need to study breeding systems. Tropical Ecology 37, 39-42.

De Castri F, Hansen AJ. 1992. The environment and development crisis as determinants of landscape dynamics, In: Hansen A.J. and De Castri F. (Eds.) Landscape boundaries for biotic diversity and ecological flows. Springer Verlag, New York. p. 3-18.

Ellis RH, Hong TD, Roberts EH. 1985. Handbook of seed technology for gene banks Vol II, IBPGR. p. 471 – 480.

Frankel OH, Soule ME. 1981. Conservation and Evolution. Cambridge University Press.

Hamilton MB. 1994. Ex situ conservation of wild plant species; time to reassess the genetic assumptions and implication of seed banks. Conservation Biology 1, 39-49.

Heywood VH. (Ed.). 1995. Global Biodiversity Assessment. Cambridge Univ. Press, Cambridge.

Mace GM, Stuart SN. 1994. Draft IUCN Red List Categories Version 2.2. Species 21-22, 13-24.

Menges ES. 1991. Seed germination percentage increases with population size in a fragmented praire species. Conservation Biology 5, 158 -164.

Nayar MP, Sastry ARK. 1987. Red Data Books of Indian Plants. Vol I, Botanical Survey of India, Calcutta. p. 147-159.

Nayar MP, Sastry A. 1988. Red Data Books of Indian Plants. Vol II, Botanical Survey of India, Calcutta. p. 109-118,

Nayar MP, Sastry A. 1990. Red Data Books of Indian Plants. Vol III, Botanical Survey of India, Calcutta.

Parker MA. 1985. Local population differentiation for compatibility in an annual legume and its host specific fungal pathogen. Evolution 39, 713 – 723.

Raup DM. 1978. Chart analysis of Genie Survivorship. Paleobiology 4, 1-15.

Reid WV, Miller RR. 1989. Keeping option alive. The scientific basis for conserving biodiversity. World Resource Institute Publication, p. 31-35.

Schaffer ML. 1981. Minimum population sizes for species conservation. Bioscience 31, 131 – 134.

Saini RK, Verma AN. 1994. Nature and extent of damage and biology of sunhemp hairy caterpillar Utetheisa pulchella L. in Haryana. Journal of Insect Science 7, 73-75.

Wilson EO. 1992. The diversity of life. Penguin Books, USA, p. 72-74.

Wolf EC. 1987. On the brink of extinction. Conserving the diversity of life on earth. Worldwatch paper 78, Worldwatch Institute, Washington DC.