Two Way Indicator Species Analysis (TWINSPAN) of the Herbaceous Vegetation in an Inland Wetland Ecosystem of Doon Valley Himalaya, India

1970 ◽  
Vol 3 ◽  
pp. 23-31 ◽  
Author(s):  
R. K. Manhas ◽  
M. K. Gautam ◽  
Deepa Kumari
Keyword(s):  
Soil Moisture ◽  
Key Words ◽  
Plant Species ◽  
Indicator Species ◽  
Indigenous Species ◽  
Indicator Species Analysis ◽  
Wetland Ecosystem ◽  
Herbaceous Vegetation ◽  
Doon Valley ◽  
Species Analysis

In swamp distribution, dominance and survival of a species is very much governed by the soil moisture and period of flooding. The present study was conducted to classify the communities and plant species, and to have an idea about various associations of plants present in the swamp with respect to soil moisture. Two way indicator species analysis (TWINSPAN) classified the communities into four and plant species into eleven groups. The communities with least soil moisture were the first to be segregated and with highest soil moisture last. Similarly, the species growing in drier condition was clustered separately from the moisture loving indigenous species. Key words: TWINSPAN; vegetation; inland wetland; India DOI: 10.3126/jowe.v3i0.2433 Journal of Wetlands Ecology, (2009) Vol. 3, pp 23-31

Linking environmental gradients, species composition, and vegetation indicators of sugar maple health in the northeastern United States

2008 ◽  
Vol 38 (7) ◽  
pp. 1761-1774 ◽  
Author(s):  
Stephen B. Horsley ◽  
Scott W. Bailey ◽  
Todd E. Ristau ◽  
Robert P. Long ◽  
Richard A. Hallett
Keyword(s):  
Species Composition ◽  
Multidimensional Scaling ◽  
Plant Species ◽  
Indicator Species ◽  
Sugar Maple ◽  
Vascular Plant ◽  
Indicator Species Analysis ◽  
Additional Species ◽  
Exact Test ◽  
Species Analysis

Sugar maple ( Acer saccharum Marsh.) decline has occurred throughout its range over the past 50 years, although decline symptoms are minimal where nutritional thresholds of Ca, Mg, and Mn are met. Here, we show that availability of these elements also controls vascular plant species composition in northern hardwood stands and we identify indicator species of these nutrient thresholds. Presence and abundance of vascular plant species and data on 35 environmental variables were collected from 86 stands in New Hampshire and Vermont (NHVT) and Pennsylvania and New York (PANY). Nonmetric multidimensional scaling ordination was used to determine which variables affected presence and abundance of species; both measures gave similar results. A base cation – acid cation nutrient gradient on axis one accounted for 71.9% (NHVT) and 63.0% (PANY) of the variation in the nonmetric multidimensional scaling ordination. Measures of Ca, Mg, and pH formed the base end and Al, Mn, K, soil acidity, and organic matter the acid end in both subregions. In both subregions, sugar maple foliar Mg and Ca had the strongest association with the base end of axis 1; exchangeable Al in NHVT and foliar Mn in PANY were strongly associated with the acid end. McNemar’s exact test and indicator species analysis were used to determine which species were present in stands that met the nutritional thresholds for Ca, Mg, and Mn foliar chemistry. McNemar’s exact test identified 16 species in NHVT and PANY, 16 additional species in NHVT only, and 12 additional species in PANY only. Indicator species analysis identified a subset of these species with the highest frequency of occurrence. Indicator species could provide land managers with a diagnostic tool for determining where on the landscape sugar maple is “at risk” or likely to remain healthy in the face of stresses.

Spring Bird Community Structure in Response to Habitat Heterogeneity in a Subtropical Hilly Landscape

2014 ◽  
Vol 1010-1012 ◽  
pp. 121-125
Author(s):  
Wen Bin Li ◽  
Zhi Ming Mo ◽  
Xing Ting Chen ◽  
Chun Huang ◽  
Ming Feng Xu
Keyword(s):  
Indicator Species ◽  
Habitat Heterogeneity ◽  
Southern China ◽  
Bird Species ◽  
Bird Communities ◽  
Bird Diversity ◽  
Indicator Species Analysis ◽  
Heterogeneous Habitats ◽  
Species Analysis ◽  
The Impact

To examine the impact of habitat heterogeneity on the bird communities, we investigated the structural differences of various bird communities occurring in heterogeneous habitats in the subtropical hilly areas of southern China. We used indicator Species Analysis (ISA) to test the association of specific bird species to particular habitats. We performed Two-way Cluster Analysis to find species patterning in response to habitat fragmentation. Our results demonstrated that heterogeneous habitats promoted bird diversity and human activities affected bird behavior. Indicator Species Analysis demonstrated that similar habitats had similar bird communities, while different habitats supported various bird indicator species. Although habitat diversity increased bird diversity of a region, it was unfavorable for the maintenance of specialized birds in the forests of the subtropical hilly area.

scholarly journals A vegetation survey of the Tsitsikamma Coastal National Park

Koedoe ◽  
1989 ◽  
Vol 32 (1) ◽  
Author(s):  
N. Hanekom ◽  
A. Southwood ◽  
M. Ferguson
Keyword(s):  
Correspondence Analysis ◽  
Indicator Species ◽  
National Park ◽  
Detrended Correspondence Analysis ◽  
Indicator Species Analysis ◽  
Vegetation Survey ◽  
Afromontane Forest ◽  
Species Analysis ◽  
North And South

Sampling plots (5 m x 10 m in fynbos, 10 m x 10 m in forest) were analysed in the littoral, coastal escarpment, and north and south facing inland escarp- ment zones of 17 transect sites along the length of the Tsitsikamma Coastal National Park. Cover- abundance values were estimated for each species in the sampling plots. A detrended correspondence analysis (using CANOCO) and a two way indicator species analysis (TWINSPAN) were carried out on these data to determine the communities sampled. The vegetation of the park was classified into an Afromontane Forest, a Littoral Herbland and two Mesic Mountain Fynbos Communities. The distribution and extent of these communities were determined and their conservation discussed.

scholarly journals Estrutura e relações ambientais de grupos florísticos em fragmento de floresta estacional subtropical

2013 ◽  
Vol 37 (2) ◽  
pp. 275-287 ◽  
Author(s):  
Suzane Bevilacqua Marcuzzo ◽  
Maristela Machado Araújo ◽  
Solon Jonas Longhi
Keyword(s):  
Indicator Species ◽  
Indicator Species Analysis ◽  
M 10 ◽  
Species Analysis ◽  
Em 12

Este estudo teve por objetivos analisar a estrutura de grupos florísticos na vegetação arbórea-arbustiva de um trecho de encosta de Floresta Estacional Subtropical, no Parque Estadual Quarta Colônia, RS, e determinar fatores ambientais importantes na ocorrência das espécies, a fim de subsidiar programas de restauração de áreas degradadas como ecossistema de referência. Para isso, foi realizado estudo fitossociológico em 12 parcelas de 200 m² (10 x 20 m), distantes 20 m entre si, distribuídas sistematicamente em quatro faixas de 100 m entre si, seguindo gradiente de topografia. Em cada parcela foram realizadas a identificação e a medição da circunferência à altura do peito (CAP) e da altura total dos indivíduos arbóreos e arbustivos, ou seja, com CAP > 15 cm, denominado componente arbóreo. Os dados do sub-bosque foram obtidos em parcelas circulares com raio de 1,78 m, instaladas no centro das parcelas de 10 x 20 m, medindo-se indivíduos com altura > 30 cm e CAP <15 cm. As variáveis ambientais foram compostas pela declividade, pela intensidade luminosa, pelas características químicas e textura do solo. Os dados foram analisados segundo a estrutura e diversidade da vegetação por meio da análise de agrupamento pelo método TWINSPAN (Two-way Indicator Species Analysis) e da ordenação pelo método CCA (Análise de Correspondência Canônica). Foi identificada a formação de dois grupos florísticos. A composição de espécies de cada grupo pertence a diferentes estágios de sucessão natural, conforme histórico de uso agrícola, e, segundo suas características funcionais, podem ser indicadas para programas de restauração florestal.

Patterns of Indigenous Tree Species Distribution in Guangdong Province and the Implications for Tree Introduction

2012 ◽  
Vol 518-523 ◽  
pp. 5324-5329 ◽  
Author(s):  
Xiang Lin Wang ◽  
Jing Peng Li ◽  
Yan Zhang ◽  
Zhi Yao Su
Keyword(s):  
Species Distribution ◽  
Indicator Species ◽  
Tree Species ◽  
Guangdong Province ◽  
Distribution Patterns ◽  
Indicator Species Analysis ◽  
Mountain Areas ◽  
Species Analysis ◽  
Significant Difference ◽  
Indigenous Tree Species

Distribution pattern of 1148 indigenous tree species in Guangdong province and their relations to the environment were investigated based on the 0.5°×0.5° latitude-longitude grid system. The results showed that indigenous tree species richness increased with increasing latitude. Richness peaked in the middle of the study area with longitudinal gradient. Four ecological areas for indigenous tree species distribution were delimited using cluster analysis and TWINSPAN (two-way indicator species analysis). Indicator Species Analysis showed a significant difference was found in indicator species distribution across latitude gradient and the 4 ecological areas. Northern mountain areas and southern coastal areas possessed most of the indicator species (IV ≥ 0.7), among which Celtis philippensis, Gironniera cuspidata and Symplocos chunii were strongly indicative of the environmental characteristics. The study of distribution patterns and classification of ecological areas, which reflects different geographical and climatic characteristics, will be of significant implications for introduction of indigenous tree species from natural ecological areas.

scholarly journals MULTIVARIATE MULTIVARIATE ANALYSIS OF WEEDS OF CHICKPEA, MUSTARD AND WHEAT CROP FIELDS OF TEHSIL ISAKHEL, DISTRICT MIANWALI (PUNJAB), PAKISTAN

2021 ◽  
Vol 27 (2) ◽  
pp. 153-162
Author(s):  
Sohaib Muhammad
Keyword(s):  
Multivariate Analysis ◽  
Indicator Species ◽  
Wheat Crop ◽  
Indicator Species Analysis ◽  
Weed Species ◽  
Percentage Cover ◽  
Crop Fields ◽  
Species Analysis

Multivariate analysis through Two Way Indicator Species Analysis (TWINSPAN) was conducted to study the phytosociological attributes of weeds of some selected crop fields of chickpea, mustard and wheat of Tehsil Isa Khel, District Mianwali, Punjab. Forty one (41) weed species were collected from the study area belonging to twenty one (21) different families. Twenty four weed species found in chickpea, twenty five in mustard and twenty nine in wheat crop fields. Sixteen weed species were common in three crops. Family Poaceae and Astraceae had maximum weed species i.e. 7 and 6 species respectively followed by Euphorbiaceae, Fabaceae, Chenopodiaceae, Papaveraceae, Zygophyllaceae and so on. Asphodelus tenuifolius, Medicago monantha and Carthamus oxycantha are frequently occurring weeds relative to others. Two-Way Indicator Species Analysis (TWINSPAN) was performed on the percentage cover basis which divided the weed species into groups, sub groups, associations and sub associations.

scholarly journals CLASIFICACIÓN DE BOSQUES SOBRE ARENA BLANCA DE LA ZONA RESERVADA ALLPAHUAYO-MISHANA

2006 ◽  
Vol 14 (1) ◽  
pp. 17 ◽  
Author(s):  
Roosevelt GARCÍA-VILLACORTA ◽  
Manuel AHUITE-REÁTEGUI ◽  
Mauro OLORTEGUI-ZUMAETA
Keyword(s):  
Cluster Analysis ◽  
Indicator Species ◽  
Landsat Tm ◽  
Indicator Species Analysis ◽  
Species Analysis ◽  
Los Grupos

La Zona Reservada Allpahuayo-Mishana (ZRAM) alberga las áreas más extensas de bosques sobre arena blanca, localmente conocidos como varillales, protegidas actualmente en el Perú. Con el propósito de obtener información que ayude en el manejo y la conservación de este tipo de vegetación, nosotros estudiamos la composición florística, estructura y características ambientales de 44 parcelas, 20 x 20 m, ubicadas en los suelos de arena blanca de la ZRAM, Loreto, Perú (3°53’S, 73°25’O, 110-180 m.s.n.m.). Para la selección de los lugares demuestreo en el área utilizamos una imagen de satélite Landsat TM 5. Seleccionamos los lugares de muestreo, tratando de abarcar la mayor variación posible que podíamos observar en los colores de la imagen de satélite, con el fin de muestrear varillales potencialmente diferentes en el campo. Las parcelas estuvieron ubicadas a lo largo de transectos que atravesaron parches heterogéneos de varillal. En cada parcela registramos, en cinco clases diamétricas, a todos los individuos que tenían al menos un metro de altura e hicimos una estimación de la cobertura herbácea. También medimos la altura del dosel y grosor de la capa orgánica. Realizamos análisis de agrupamiento (cluster analysis), entre las parcelas, usando como variables el número de tallos por parcela, la altura del dosel y la calidad del drenaje expresada por el grosor de la capa orgánica (capa orgánica delgada = buen drenaje, y viceversa). Utilizamos además la abundancia y frecuencia de las especies en los grupos paradefinir especies indicadoras (indicator species analysis). En el contexto de nuestro estudio, y utilizando la terminología regional para estos bosques, reconocemos la existencia de cinco tipos de varillales en la ZRAM: varillal alto seco, varillal alto húmedo, varillal bajo seco, varillal bajo húmedo y chamizal.

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