COMPOSITIONS, DISTRIBUTIONS AND STATUS OF ECONOMIC PLANTS AMONG INVASIVE FLORAS OF UTTARPARA, WEST BENGAL, INDIAHTML Full Text
Compositions, distributions and status of economic plants among invasive floras of Uttarpara, West Bengal, India
Saikat Biswas, Mayum Maity, Sounak Srimany, Subhashree Chatterjee, Tanaya Karmakar, Ruma Datta, Jhilam Patra, Mithun Koley and Dibyendu Talukdar *
Department of Botany, R.P.M. College (University of Calcutta), Uttarpara 712258, West Bengal, India
ABSTRACT: A survey was carried out during the span of 2005-2010 to invent the invasive alien plant species and their economic uses in urban and adjoining rural areas of Uttarpara, Hooghly district, West Bengal. Study revealed occurrence of 103 alien angiospermic plant species under 32 families, of which four families (Araceae, Poaceae, Cyperaceae, Pontederiaceae) are monocots. Dicot family Fabaceae dominated with 20 plant species, followed by Asteraceae with 17, Amaranthaceae with 8, Solanaceae with 7, Euphorbiaceae with 5, and then other families. Rise in number of alien species was evidenced in year-wise quadrat studies, screening 11 most invasive species namely Parthenium hysterophorus, Eupatorium odoratum, Ageratum conyzoides, A. haustonianum, Chromolaena odorata, Cassia sophera, Leucaena leucocephala, Alternanthera sessilis, Amaranthus spinosus, Lantana camara and tree, Trema orientralis distributed within Aseteraceae (5 taxa), Fabaceae (2 taxa), Amaranthaceae (2 taxa), Verbenaceae (1 taxon) and Ulmaceae (1 taxon). Remarkably, the alien species have been used in diverse economic and commercial purposes by local village folks, showing use of nearly 49% plants in local health-care systems as herbal products
Invasive alien plants,
Introduction: Invasive alien species are colonizer species that have established populations outside their native distributional ranges and that have potential to spread and affect native ecosystems or local human-mediated systems 1, 2. Biological invasions by alien species are widely recognized second worst threat to native biodiversity and impose high costs toagriculture, forestry, and aquatic ecosystems.The global extent and rapid increase in invasive species is homogenizing the world’sflora and fauna 3 and is recognized as a primary cause of globalbiodiversity loss, diminishing regional distinctiveness of flora and fauna and catalyzing homogenization of biota 4, 5.
Yet, a large number of alien plants are daily used by local population in fuel, sheltering, fishing, medicinal, and other purposes 6, 7.At least 10% of the world’s vascular plants (3,00,000) have the potential to invade other ecosystems and affect native biota in direct and indirect ways 8. About 18% of the Indian flora is composed of alien species, of which tropical
America has the largest share (55%), followed by Asia (30%), and Europe, the Mediterranean and others (15%). About 40% of the Indian flora is alien, of which 25% are invasive alien species 8, 9. As India is considered as a biodiversity rich country, authentic documentation of alien plant species are urgently needed at regional level to get a comprehensive national data base for better management and utilization of exotic floras 10.
The state of West Bengal is located between 85˚ 50΄ and 89˚ 50΄ E and 21˚ 38΄ and 27˚ 10΄ N, and one of populas but the biodiversity rich states in India. The lower Indo-Gangetic basin constitutes fertile hub for diverse types of flora and fauna, introduced by anthropogenic activities since time immemorial. The Hooghly district is an important part of this basin, dotted with numerous wetlands, forest covers and agricultural lands. Hooghly is the major river with some small rivers constituting the riverine and floodplain systems in this district. Uttarpara (situated between 22˚40΄N and 22.67˚05΄N latitude and 88˚21' and 88˚35΄E longitude) is one of the oldest heritage cites in Hooghly district, delimited by Bally khal in South and river Hooghly in the eastern side representing lower part of Gangetic basin.
The climate of the district is tropical monsoon with three distinct seasons-summer (March-early June), rainy (June-September) and winter (October –February), and mean annual rainfall ca, 1300 mm. While maximum summer temperature may sore to 43 °C, winter is extremely chilled with temperature may plummet to 10-12 °C. The region is very rich in biodiversity but extensive urbanization coupled with introduction of exotic plant species cause a threat to native floras. As biological invasions are frequently influenced by ecosystem functioning 11, climate change 12-14, environmental pollution 15, and other physico-chemical mechanisms, a proper first hand inventory in disturbed areas is absolutely necessary to assess threats on indigenous resources.
Although rich in floral diversity, no investigation was carried out to document the economic plants utilizations among invasive alien plants in this area. In the last 5-6 years, activities of trade, various infrastructure development projects, vehicle and rail transport increased to a considerable extent. As invasive species has huge ecological impacts and preference over native species in urban ecology due to their faster rate of growth, biomass production, allelopathic potential, high reproductive efficiency, seed dispersal types, rapid establishments and hardiness to abiotic stress, documentation of alien plants is necessary. The objectives of the present study are, therefore, to document the alien flora, their classification and use by local people in and around the Uttarpara region.
Materials and Methods:
The present investigation was carried out by extensive field survey during the last six years (2005-2010) in different intervals (March-June, September-January) in Uttarpara area covering both urban and villages adjacent it (Fig 1).
FIGURE 1: A MAP OF STUDY AREAS (RED DOTS) IN UTTARPARA HOOGHLY DISTRICT, WEST BENGAL, INDIA.
Collection of data and methods of inventory:
Plant samples were collected either in flowering or in fruiting stage, and voucher specimens were deposited in departmental herbaria, R.P.M. College, Uttarpara, Hooghly and pressed specimens are being digitalized in Digital Phyto-Informatics Center of the Botany department (http://www.rpmcdigitalphytoinformatics.com/).
Invasive nature of some of the worst alien species, enlisted by previous works 16, 17, was studied using techniques of Baider and Florens 18, namely through a combination of random walks through the area along with a more quantitative sampling of the seedlings and larger woody plants (flowering or fruiting stage) in a series of square quadrats (1 × 1 m for seedlings and 10 × 10 m for tree). Frequency (F%) of particular plant species was calculated by dividing the number of quadrats in which a particular species occur with total number of quadrats laid down.
The specimens were identified through extensive survey of available literatures, monographic works, and confirmed by IPNI (International Plant Names Index) data base (www.IPNI.org). Use of documented flora was tabulated through interviews of knowledgeable people like temple priests, village head, old experienced folk, medicine men, farmers, teachers, etc. Gathered information was thoroughly cross-checked by structured questionnaires, and documented thereafter. Nativity of the species was tested from the available literatures 19.
Documentation and classification of alien taxa:
Present inventorization of the alien invasive flora in and around Uttarpara revealed occurrence of 103 species belonging to 83 genera under 32 families (Table 1). Among the plant growth form, herbs constituted 85%, and it was followed by shrub (9%), tree (4%) and climbers (2%). Several genera were found to possess three or more species (Table 1). Dicotyledonous species contributed major proportion (94%) of alien flora grouped under 96 species and 28 families (Table 1), followed by Monocotyledons (6%) distributed in seven genera under four families. Among the total 32 families, Fabaceae dominated with 20 species, followed by Asteraceae (17 species), Amaranthaceae (8), Solanaceae (7) and then others (Table 1; Fig. 2).
FIGURE 2: DISTRIBUTION OF ALIEN PLANT SPECIES IN DIFFERENT ANGIOPSPERM FAMILIES; A-Family Fabaceae, B-Asteraceae, C- Amaranthaceae, D-Solanaceae, E-Euphorbiaceae, F- Malvaceae/ Scrophulariaceae/ Lamiaceae/ Convolvulaceae/ Asclrpiadaceae/Poaceae (three species each), G-Cuscutaceae/ Verbenaceae/ Pontederiaceae/ Acanthaceae/ Polygonaceae (two species each), H-rest of the 16 families with one species each, as mentioned in Table 1.
About 38% of invasive species identified in the present study were most abundant in roadside (GT roads and rural roads) bushes, while inside area was suitable for 32% plant species. Cultivated fields and banks of water bodies were preferred by 20% and 10% species, respectively. Quadrat studies in the last six years revealed high frequency of some of the daisies like Parthenium hysterophorus, Eupatorium odoratum, Ageratum conyzoides, Ageratum houstonianum, Chromolaena odorataalong the roadside than the interior of the villages (Fig. 3).
FIGURE 3 VILLAGE-FOREST/ROADSIDES RATIO OF NUMBER OF PLANTS FOR ELEVEN ALIEN TAXA.
The ratio of number of plants (cumulative of 400 quadrats/year in six years) between interior villages/forest area and roadside varied between 0.53-0.88 for these five daisy members, while it was close to 1.0 for Cassia sophera (0.98), >1.0 for Leucaena leucocephala, Alternanthera sessilis, Trema orientalis and Amaranthus spinosus, and was 2.15 for Lantana camara (Fig. 3). By contrast, Wedelia chinensis, Tridax procumbens and Eclipta prostrata exhibited higher frequency in interior of the study sites (F=80-86%) than the roadside (F=65-72%).
Within the village area, members of Amranthaceae such as Achyranthes aspera, Alternanthera philoxeroides, Alternanthera sessilis and Amaranthus spinosus dominated intermingling with numbers of leguminous plants like Aeschynomene americana, different species of Cassia, Crotalaria, Leucaena leucocephala, Mimosa pudica, and species of other families in different magnitudes.
Interestingly, frequency of Parthenium reduced in plots where species of family Amaranthaceae dominated. The tree Trema orientralis flourished within the undisturbed area better than the roadside (Fig. 3). Members of family Polygonaceae, Araceae, Cyperaceae, Pontederiaceae preferred wetland areas, while Solanaceae, Euphorbiaceae, Malvaceae, Cactaceae, Convolvulaceae and Asclepiadaceae were more frequent in dry land.
Documentation of spread of alien flora over the last six years (2005-2010) revealed steep rise in number of certain plant species (quadrat wise) such as species of Parthenium, Ageratum, Chromolaena, Eupatorium, Cassia, Leucaena, Alternanthera, Lantana, Amaranthus and Trema (Fig. 4),while low to moderate risewas documented for other species (data not presented).
FIGURE 4: FREQUENCY % OF 11 INVASIVE PLANTS AS RECORDED FROM SIX CONSECUTIVE YEARS (2005-2010) WITH 400 SQUARE QUADRATS LAID DOWN/YEAR,A- Parthenium hysterophorus L., B- Eupatorium odoratum L., C- Ageratum conyzoides L., D- Ageratum houstonianum Mill., E- Chromolaena odorata (L.) King & Robinson, F- Leucaena leucocephala (Lam.) de Wit, G-Cassia sophera L., H- Alternanthera sessilis (L.) R.Br. ex DC, I- Lantana camara L, J- Trema orientralis (Linn.)Blume, and K- Amaranthus spinosus L.
Economic/commercial utilization of alien plants by local people:
The 103 plant species documented as alien flora in the present inventory have been used by local population as food, fodder, medicinal, ornamental, commercial (fishing, thatching, basket making, etc,), religious and other purposes (Fig. 5), revealing resource utilization by people in diverse ways. Among the species, members of legume family Fabaceae have been used most extensively as food, fodder, fuel, manure, folk play and other purposes (Table 1).
As local people reveled, wild beans (Phaseolus spp), mungs (Vigna spp), khesari (Lathyrus sativus L.) and jangli matar (Lathyrus aphaca L.) have considerable benefits in their daily life; seed flour as food supplement, making besans, pokaras, whole plant as fodder, soil fertilizer (mulching), and tender pod as vegetables. About 49% of total alien plants were used as medicinal purposes, while 11.6 % plants were utilized as food and 9.7 % used as cattle feed.
Among the small-scale cottage industries, preparation of beads on string using seeds of Coix (Poaceae) and commercial ‘shola’ using Aeschynomene americana (Fabaceae) were found highly beneficial for local economics.Different types of wood works, another financially viable activity within the study area, are mainly carried out with Prosopis julifera (Fabaceae) tree. Besides, different plant parts have been used as folk play, insecticide and aromatic purposes (Table 1; Fig. 5).
Table 1: Invasive plant species and their utilizations in Uttarpara areas of Hooghly district of West Bengal, India
|1||Aerva javanica (Burm.f.) Juss.ex Schult||Amaranthaceae||Herb||Trop. America||M|
|2||Achyranthes aspera L.||Amaranthaceae||Herb||Trop. America||M|
|3||Aeschynomene americana L.||Fabaceae||Herb||Trop. America||Co, ‘shola’|
|4||Ageratum conyzoides L.||Asteraceae||Herb||Trop. America||NU|
|5||Ageratum houstonianum Mill.||Asteraceae||Herb||Trop. America||NU|
|6||Alternanthera philoxeroides(Mart.) Griseb.||Amaranthaceae||Herb||Trop. America||Veg|
|7||Alternanthera pungens Kunth||Amaranthaceae||Herb||Trop. America||M|
|8||Alternanthera sessilis (L.) R.Br. ex DC||Amaranthaceae||Herb||Trop. America||M, Veg|
|9||Amaranthus spinosus L.||Amaranthaceae||Herb||Trop. America||M|
|10||Argemone mexicana L.||Papaveraceae||Herb||Trop. America||NU|
|11||Bidens pilosa L.||Asteraceae||Herb||Trop. America||M|
|12||Blumea lacera (Burm.f.) DC.||Asteraceae||Herb||Trop. America||M, veg|
|13||Boerhaavia erecta L.||Nyctaginaceae||Herb||Trop. America||M, veg, Cf|
|14||Calotropis gigantea (L.) R.Br.||Asclepiadaceae||Shrub||Trop. Africa||M|
|15||Calotropis procera (L.) R.Br.||Asclepiadaceae||Shrub||Trop. Africa||M|
|16||Cassia alata L.||Fabaceae||Shrub||West Indies||M, Thatching|
|17||Cassia javanica L.||Fabaceae||Tree||S.E. Asia||Or, M|
|18||Cassia occidentalis L.||Fabaceae||Herb||Trop. S. America||M, Bf|
|19||Cassia sophera L.||Fabaceae||Herb||Trop. S. America||M, Bf|
|20||Catharanthus pusillus (Murray)Don||Apocynaceae||Herb||Trop. America||M|
|21||*Chromolaena odorata (L.) King & Robinson||Asteraceae||Herb||Trop. America||NU|
|22||Chrozophora rottleri (Geis.)||Euphorbiaceae||Herb||Trop. Africa||M|
|23||Chenopodium album L.||Chenopodiaceae||Herb||Europe||Veg, Cf|
|24||Cleome gynandra L.||Cleomaceae||Herb||Trop. America||M|
|25||Cleome monophylla L.||Cleomaceae||Herb||Trop. America||M|
|26||Cleome rutidosperma DC.||Cleomaceae||Herb||Trop. America||M|
|27||Coix lacryma-jobi L.||Poaceae||Herb||S. E. Asia||Pearl, fishing|
|28||Crotalaria pallida Dryand||Fabaceae||Herb||Trop. America||Bf|
|29||Crotalaria retusa L.||Fabaceae||Herb||Trop. America||Bf|
|30||Croton bonplandianum Boil.||Euphorbiaceae||Herb||Temp.S. America||M|
|31||Cryptostegia grandiflora R.Br.||Asclepiadaceae||Woody Climber||Trop. Africa (Madagascar)||M|
|32||Cuscuta chinensis Lam.||Cuscutaceae||Herb||Mediterranean||NU|
|33||Cuscuta reflexa Roxb||Cuscutaceae||Herb||Mediterranean||NU|
|34||Cyperus rotundusL.||Cyperaceae||Herb||Africa, S. Europe||M|
|35||Cytisus scoparius (L.) Link||Fabaceae||Herb||Europe||M|
|36||Datura innoxia Mill.||Solanaceae||Shrub||Trop. America||M|
|37||Datura metel L.||Solanaceae||Shrub||Trop. America||M|
|38||Dentella repens (L.) Forst||Rubiaceae||Herb||E. Asia, Australia||Veg|
|39||Digera muricata (L.) Mart.||Amaranthaceae||Herb||S. W. Asia||Veg|
|40||Duranta repens L.||Verbenaceae||Shrub||
|41||Echinochloa crusgalli (L.) P.Beauv.||Poaceae||Herb||Trop. S. America||M|
|42||Echinacea paradoxa Britton||Asteraceae||Herb||Europe||NU|
|43||Eclipta prostrata (L.) Mant.||Asteraceae||Herb||Trop. America||M|
|44||*Eichhornia crassipes kunth||Pontederiaceae||Aq. Herb||Trop. America||NU|
|45||*Eupatorium odoratum L.||Asteraceae||Herb||Europe||NU|
|46||Euphorbia hirta L.||Euphorbiaceae||Herb||Trop. America||Cf|
|47||Euphorbia heterophylla L.||Euphorbiaceae||Herb||Trop. America||Cf|
|48||Evolvulus nummularius (L.) L.||Convolvulaceae||Herb||Trop. America||Cf|
|49||Gnaphalium coarctatum Willd.||Asteraceae||Herb||Trop. America||NU|
|50||Gnaphalium pensylvanicum||Asteraceae||Herb||Trop. America||NU|
|51||Gomphrena serrata L.||Amaranthaceae||Herb||Trop. America||Or|
|52||Hyptis suaveolens (L.) Poit.||Lamiaceae||Herb||Trop. America||Aromatic|
|53||Impatiens balsamina L.||Balsaminaceae||Herb||Trop. America||Or|
|54||Indigofera astragalina DC.||Fabaceae||Herb||Trop. America||Cloth washing|
|55||Indigofera linifolia (L.f.) Retz.||Fabaceae||Herb||Trop. America||NU|
|56||Ipomoea quamoclit L.||Convolvulaceae||Herb||Trop. America||Bf|
|57||Ipomoea aquatica Forsk||Convolvulaceae||Aquatic||Trop. America||M, veg|
|58||*Lantana camara L.||Verbenaceae||Herb||Trop. America||Bf|
|59||Lathyrus aphaca L.||Fabaceae||Herb||Mediterranean||M, Cf, mulching|
|60||Lathyrus sativus L.||Fabaceae||Herb||Mediterranean||Pulse, Fd, besan, Cf, veg|
|61||Leonotis nepetiifolia (L.) R.Br.||Lamiaceae||Herb||Trop. Africa||M|
|62||*Leucaena leucocephala (Lam.) de Wit||Fabaceae||Tree||Trop. America||Bf, basket making,|
|63||Ludwigia perennis L.||Onagraceae||Herb||Trop. America||M|
|64||Malachra capitata (L.) L.||Malvaceae||Herb||Trop. America||M|
|65||Mecardonia procumbens (Mill.) Small||Scrophulariaceae||Herb||Trop. N. America||NU|
|66||Melilotus alba Desv.||Fabaceae||Herb||Europe||Insecticide|
|67||*Mikania micrantha Kunth||Asteraceae||Climber||Trop. America||NU|
|68||Mimosa pudica L.||Fabaceae||Herb||Trop. S. America||M|
|69||Monochoria vaginalis (Burm.f.)C. Presl.||Pontederiaceae||Aquatic herb||Trop. America||M|
|70||Nicotiana plumbaginifolia Viv.||Solanaceae||Herb||Trop. America||NU|
|71||Ocimum basilicum L||Lamiaceae||Herb||Trop. America||M|
|72||* Opuntia stricta (Haw.) Haw.||Cactaceae||Herb||Trop. America||NU|
|73||Oxalis corniculata (DC.) Raeusch.||Oxalidaceae||Herb||Europe||M|
|74||Parthenium hysterophorus L.||Asteraceae||Herb||Trop. N. America||NU|
|75||Pennisetum purpureum Schum.||Poaceae||Herb||Trop. N. America||Cf|
|76||Peperomia pellucida (L.) Kunth||Piperaceae||Herb||Trop. America||Folk play|
|77||Peristrophe paniculata (Forssk.) Brummitt||Acanthaceae||Herb||Trop. America||NU|
|78||Phaseolus aureus L.||Fabaceae||Herb||Trop. America||Fd, Cf, veg|
|79||Phyllanthus fraternus Webster||Euphorbiaceae||Herb||Trop. America||M|
|80||Physalis angulata L.||Solanaceae||Herb||Trop. America||Folk play|
|81||Pilea microphylla (L.) Liebm.||Urticaceae||Herb||Trop. America||NU|
|82||Pistia stratiotes L.||Araceae||Herb||Trop. America||M|
|83||Polygonum barbatum L.||Polygonaceae||Herb||S. E. Asia||M|
|84||Polygonum hydropiper L.||Polygonaceae||Herb||S. E. Asia||M|
|85||Portulaca oleracea L.||Portulacaceae||Herb||Trop. S. America||Or|
|86||Prosopis juliflora (Sw.) DC.||Fabaceae||Tree||Trop.S. America||Wood works|
|87||Ruellia tuberosa L.||Acanthaceae||Herb||Trop. America||Or|
|88||Scoparia dulcis L.||Scrophulariaceae||Herb||Trop. America||M|
|89||Sesbania grandiflora||Fabaceae||Shrub||Trop. America||Bf, veg, M, Or|
|90||Sida acuta Burm.f.||Malvaceae||Herb||Trop. America||M|
|91||Solanum torvum Sw.||Solanaceae||Shrub||Trop. America||M|
|92||Solanum xanthocarpum||Solanaceae||Shrub||Trop. America||NU|
|93||Solanum nigrum L.||Solanaceae||Herb||Trop. America||M|
|94||Sonchus oleraceus L.||Asteraceae||Herb||Mediterranean||NU|
|95||Spilanthes radicans Jacq.||Asteraceae||Herb||Trop. America||M|
|96||Tephrosia purpurea (L.) Pers.,||Fabaceae||Herb||Trop. America||M|
|97||Torenia fournieri Linden ex E. Fournier||Scrophulariaceae||Herb||Australia||NU|
|98||Trema orientralis (Linn.)Blume||Ulmaceae||Tree||S. E. Asia||M, Bf, fishing, thatching|
|99||Tridax procumbens L.||Asteraceae||Herb||Trop. America||M|
|100||Urena lobata L.||Malvaceae||Herb||Trop. America||M|
|101||Wedelia chinensis||Asteraceae||Herb||S. E. Asia||M|
|102||Vernonia cinera L.||Asteraceae||Herb||Temperate America||NU|
|103||Vigna sublobata (L.) Wilczek||Fabaceae||Herb||S. E. Asia||Pulse, ‘bori’, besan, Cf|
* enlisted in database of world’s 100 worst invasive; M-medicinal, Co-compost, Or -ornamental, Bf-biomass fuel, Cf-cattle feed, Fd-Food, Veg-Vegetables, NU-not in use
Nativity of documented alien flora:
Contribution of different geographical regions in terms of nativity of documented flora was shown in Figure 6. Tropical America accounted for nearly 60% plants, followed by share of South-East Asia,
Europe and tropical South America, tropical Africa, the Mediterranean and other regions.
Discussion: In the present inventory, the share of invasive species with economic utilization in the floral compositions of study areas has been estimated to 57.11%, while rest of the amount was made up of native species, suggesting dominance of alien flora in Uttarpara areas. Herbs constituted major portions (85%) of this alien species and except only seven species, all others belong to 28 different dicot families. This suggests that increasing urbanization in and around Uttarpara has coincided with increase in alien plant population.
FIGURE 5: UTILIZATION OF RESOURCES OF ALIEN PLANTS BY LOCAL PEOPLE; OTHERS INCLUDE FOLK PLAY, AROMATIC, INSECTICIDE.
FIGURE 6: NATIVITY OF INVESTIGATED 103 ALIEN TAXA IN 12 WORLD GEOGRAPHIC REGIONS WITH LION’S SHARE IS FROM TROPICAL (TROP) AMERICA, S-SOUTH, E-EAST, N-NORTH, W-WEST.
The dominance of leguminous (Fabaceae) plants in the present study over other species agrees well with earlier reports on Sub-Himalayan North Bengal, India7. Although Fabaceae contained highest number of alien species in the present study, dominance of Asteraceae in invasive alien flora was reported in parts of India 19, China 18, 20, and other countries 21. The higher frequency of some asters along the roadside than the interior of the village/bushes indicated uneven distribution of Asteraceae weeds in the present study area, resulting in interior village/roadside ratio in number
of plants below 1.0 for the family. Unlike asters, members of Fabaceae and Amaranthaceae were more evenly distributed as revealed by quadrat plots. Higher number of Lantana camara and Trema orientralis in forest wasteland suggested invasion of these two aggressive species in nutrient-deficient regions in expense of native flora, leading to village/roadside ratio for these two species over 1.0.
Relative degree of disturbances in habitats, apart from abiotic and biotic constrain, have profound effect to change the physical environment, creating opportunities for introduction and establishment of non-indigenous species to invade native systems in this forest area, as argued in other invasive biological systems 6, 18.
Reduction in frequency of one of the world’s worst noxious weeds, Parthenium hysterophorus in plots where members of family Amaranthaceae dominated indicated antagonistic/allelopathic effect of amaranth members on spreading of Parthenium. Phenomenon of inhibitory or allelopathic effect has been reported in many plant species inteactions including effect of aster, Blumea lacera L. on rice and common kharif weeds, 22-26.
Recently, allelopathic effect of world’s worst invasive plant Lantana camara has been revealed in terms of chromotoxicity and severe oxidative imbalance in target crop legumes 27. However, role of chromosomal rearrangements, ploidy level variations and other intrinsic biochemical mechanisms have been suspected behind aggressiveness of alien invasions, as polyploid species and favorable chromosomal rearrangements, reported in legumes like Lathyrus 28, 29, 30 may have better fitness than common native plants 31.
Furthermore, aneuploid genomes and diploid mutated genotypes showing altered morphological, biochemical and molecular make-up may acquire new strategy towards adaptations under diverse stresses 32, 33, 34, 35, 36, and thus, origin of new invasive flora cannot be ruled out.
The steep rise in population of 11 plants species in the present investigated area during the last six years has been revealed by quadrat plots. These 11 plants, therefore, were selected as indicator of alien invasion in the present study area, and their distribution data manifested as ratio of interior village/forest and roadside was presented. The four taxa of asters (Parthenium, Ageratum, Eupatorium, Chromolaena) with 5 species, assessed by this parameter, had not been used by local people in any purposes, but the two legumes, Cassia and Leucaena, were extensively utilized as medicinal (anti-diabetic) and as fuel, respectively. Similarly, Trema orientalis was mainly use as fuel.
The Lantana camara, Amaranths spinosus and Alternanthera sessilis, exhibiting aggressive nature of dominance in degraded land/forest areas, have some use by local people. Utilization of invasive plant resources for diverse economic purposes has been documented in the present inventory. It was found that majority (ca, 49%) of the invasive plant species were used in local health care systems, followed by food and cattle feed. Uses of leguminous plants as both food and forage by village folks have considerable significance as legumes are cheap source of plant protein with many essential amino acids, antioxidant flavonoids and minerals 37.
A recent survey in Sikkim Himalayas (India) revealed extraordinary potential of legumes in formulation of diverse types of ethnic food and medicines 38. Use of fruits and flowers of the ornamental legume Sesbania grandifloraby village folks in different ailments is highly beneficial for their health, as the legume is one of the richest natural sources of vitamin A39. Conservation of legume germplasm is absolutely essential to prevent their dwindling genetic diversity throughout the world including India.
The huge potential of under-utilized and ‘poor man’s’ legume like Lathyrus in sustainable agro-biodiversity and maintenance of soil nutrition in degraded forest areas due to its remarkable hardiness against abiotic (salinity, heavy metals etc.) and biotic stress has been recognized in recent decade and genetic improvement programs have been undertaken 40, 41, 42, 43, 44. Identification of wild legumes as alien species in the present study assumes significance for three reasons: first, their utilization in crop improvement, second, their role/effect in alteration of legume-pollinator relationship with existing native cultivars in the invaded region, and third, as almost all parts of the study area is arsenic-contaminated, their potential to accumulate toxic metals in edible part and concomitant risk to consumers.
A recent study in these directions revealed bioaccumulation of arsenic and other heavy metals in photosynthetic part of prominent crop legumes like Phaseolus vulgaris, Lens culinaris, Cicer arietinum, and Lathyrus sativus in the lower Bengal Gangetic basin caused severe agronomic loss of yield due to alteration in antioxidant defense mechanisms and severe impairment in plant growth 45, 46, 47. Quite alarmingly, increase in seed neurotoxin level in grass pea seeds under arsenic stress has been reported 48.
Among the 103 taxa documented in the present inventory, seven species (Eupatorium odoratum, Chromolaena odorata, Eichhornia crassipes, Lantana camara, Leucaena leucocephala, Mikania micrantha, Opuntia stricta) are enlisted as world’s 100 worst invasive species 17. The dominance of tropical American flora as alien has been attributed to presence of their strong allelopathic effects on native species 18, 23, 27. However, it must be noted that after introduction, dominance of alien flora may invite stiff competition among them which can be exploited for their better management and prevention of native species extinction.
It is also important to note that loss of native floral diversity due to alien invasion cannot be straightforward in a dynamic and functional system where increasing stress factors (both biotic and abiotic) may constrain growth and reproduction of existing native species with concomitant introduction (accidental or deliberate) and invasion of more hardy alien species, better utilizing the rapidly depleting soil fertility, habitat fragmentation and other adverse conditions to colonize 48, 49. A glaring and specific example of legume invasion is the spread of wild Lathyrus in diverse climatic conditions through its powerful seed dispersal mechanism from dehiscing pods, a genetic improvement of which is achieved recently to accelerate its domestication 50.
Conclusion: Present investigation for the first time documented compositions of alien invasive plants and their status of economic utilization by local people in and around Uttarpara region. It is alarming to note that number of alien species in this area constitutes a major share of floral biodiversity, of which 11 species are enlisted as most aggressive invasive plants within the study area. It is also important to note that the alien plants have been used by local people for medicinal and other diverse commercial and economic purposes, although they are posing considerable threat to existence of native plant species in the sanctuary.
The present inventory, therefore, can be utilized as an important reference for further risk assessments and management of both alien and alien invasive flora in conservation and co-existence of both native and alien flora in this ecologically significant but fragile region of lower Indo-Gangetic basin of India.
Acknowledgement: Authors are grateful to the Dr. Binod Kumar Pathak, HOD, Department of Botany and local people in the study area for giving necessary supports during the entire course of the study.
All authors conducted field study, corresponding author designed the study and prepared the manuscript, authors 1 and 2 prepared graph and figures, authors 3-8 conducted bibliographic study, and all authors read and approved the final manuscript
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How to cite this article:
Biswas S, Maity M, Srimany S, Chatterjee S, Karmakar T, Datta R, Patra J, Koley M and Talukdar D:Compositions, Distributions and Status of Economic Plants among Invasive Floras of Uttarpara, West Bengal, India.Int J Pharmacognosy 2014; 1(12) 800-809:.doi link: http://dx.doi.org/10.13040/IJPSR.0975-8232.IJP.1(12).800-809.
This Journal licensed under a Creative Commons Attribution-Non-commercial-Share Alike 3.0 Unported License.
Saikat Biswas, Mayum Maity, Sounak Srimany, Subhashree Chatterjee, Tanaya Karmakar, Ruma Datta, Jhilam Patra, Mithun Koley and Dibyendu Talukdar *
Department of Botany, R.P.M. College (University of Calcutta), Uttarpara 712258, West Bengal, India
26 August, 2014
15 October, 2014
29 November, 2014
01 December 2014