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.

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

Different components of plant diversity suggest the protection of a large area for the conservation of a riparian ecosystem

Biologia ◽  
2015 ◽  
Vol 70 (8) ◽  
Author(s):  
Lorenzo Lastrucci ◽  
Lorenzo Lazzaro ◽  
Tommaso Guidi ◽  
Vincenzo Gonnelli ◽  
Paolo Giordani ◽  
...  
Keyword(s):  
Species Richness ◽  
Species Composition ◽  
Plant Diversity ◽  
Indicator Species ◽  
Central Italy ◽  
Conservation Strategy ◽  
Indicator Species Analysis ◽  
Large Area ◽  
Β Diversity ◽  
Species Analysis

AbstractRiparian ecosystems host an high level of biodiversity but anthropic activities have deeply altered their naturalness and functionality. The present study was carried out in a protected area along a recently regulated tract of the upper River Tiber (Tuscany, central Italy). The study’s aim is to explore different components of plant diversity (species richness, species composition, β-diversity) in the riparian habitats to determine the most relevant conservation issues. Twelve transects were allocated along the riparian zone and a stratified random sampling was performed on the habitat detected along the transects with 184 plots of 1 x 1 m. Species richness was analysed by the use of set of species-richness estimators. The different patterns of plant diversity were analysed by NMDS, Indicator Species Analysis and SDR with symplex analysis. Five habitat types were detected in the study area. Three well-represented habitats (riparian woodlands, shrublands and dry bars) showed a higher number of species; flooded banks and marshlands were much less common and were also less species rich. Species composition and indicator species analysis showed however that marshlands were the richest in taxa having high conservation value and in indicator species. The habitats differed greatly in species composition; β-diversity analysis showed a low number of shared species between the habitats. High values of species replacement and low similarity values were recorded between the plots within the habitats. The study shows some differences between quantitative and qualitative patterns of biodiversity in the study area. The results suggest that to maintain habitat species diversity, the best conservation strategy for the study area is to protect as large an area as possible

Numerical analysis of the order Scorzoneretalia villosae

2015 ◽  
Vol 45 (1) ◽  
pp. 11-32 ◽  
Author(s):  
Massimo Terzi
Keyword(s):  
Numerical Analysis ◽  
Multidimensional Scaling ◽  
Bosnia And Herzegovina ◽  
Indicator Species ◽  
Balkan Peninsula ◽  
Indicator Species Analysis ◽  
National Scale ◽  
Species Analysis ◽  
Mediterranean Grasslands ◽  
First Time

The Scorzoneretalia villosae (= Scorzonero-Chrysopogonetalia) order was originally defined to describe the sub-Mediterranean grasslands of western Croatia, but its distribution range has since been extended to Albania, Bosnia and Herzegovina, Bulgaria, Italy, Kosovo, Montenegro, Slovenia and Serbia. Major syntaxonomic revisions of the order have been performed at the regional or national scale and show inconsistencies both for the syntaxonomic schemes and relative diagnostic taxa. This situation presents some difficulties in comparing or transferring findings between regions or when using syntaxonomic information for practical purposes. To tackle these inconsistencies, nearly nine hundred relevés already assigned to the Scorzoneretalia villosae were classified with the goal of establishing syntaxonomic relationships among associations. Diagnostic taxa of the main clusters of relevés were identified via Indicator Species Analysis (ISA). Results of statistical analyses were then interpreted from a syntaxonomic standpoint. Associations were ordinated (non-metric multidimensional scaling) on the basis of taxa frequencies in order to visualise their floristic and chorological relationships. Based on the results, associations were grouped within four alliances: Scorzonerion villosae, Chrysopogono-Saturejion subspicatae, Saturejion subspicatae and Centaureion dichroanthae were assigned to two new suborders, the meso-xerophytic Scorzonerenalia villosae and the xerophytic Koelerienalia splendentis, classified within the Scorzoneretalia villosae of the Festuco-Brometea. The order covers the western part of the Balkan Peninsula and, in the northern part of its range, the southeastern portion of the pre-Alpine sectors. Floristic similarities between the Scorzonerenalia villosae and other eastern meso-xerophytic syntaxa of the class have been highlighted. I review the nomenclature for the order, describing or validating two suborders and four associations for the first time, and lectotypifying three syntaxa.

Indicator Species Analysis of Forest Communities along a Disturbance Gradient in Guangzhou, China

2012 ◽  
Vol 195-196 ◽  
pp. 1275-1282
Author(s):  
Chun Zhu ◽  
Yong Mei Xiong ◽  
Xu Dong Ma ◽  
Xian Dong Ke ◽  
Zhi Yao Su
Keyword(s):  
Species Composition ◽  
Indicator Species ◽  
Urban Forest ◽  
Diversity Index ◽  
Indicator Species Analysis ◽  
Forest Communities ◽  
Disturbance Gradient ◽  
Tree Layer ◽  
Species Analysis ◽  
Significant Difference

In order to reveal the effect of disturbance on species composition and detect indicator species for disturbance gradients, we conducted an investigation of urban forest communities along a disturbance gradient in Guangzhou, China. Species richness in the tree layer and understory had no significant difference among disturbance gradients, but Simpson index, Shannon-Weiner index and Evenness index varied significantly.species diversity index decreased with disturbance gradient. Multi-Response Permutation Procedures (MRPP) revealed high significance in species composition of both tree and understory layer among different disturbance gradients. Twelve species from the tree layer and 25 from the understory were detected to characterize the forest communities with a certain disturbance regime by Indicator Species Analysis (ISA). Indicator species help enhance our understanding of species-environment relationship, and the ecological response of indicator species to disturbance can be used for monitoring forest environmental change.

The influence of altitude, hydrographic network and season on brown trout parasites in Corsica using indicator species analysis

2009 ◽  
Vol 84 (1) ◽  
pp. 13-19 ◽  
Author(s):  
Y. Quilchini ◽  
J. Foata ◽  
D. Mouillot ◽  
J. Mattei ◽  
B. Marchand
Keyword(s):  
Species Composition ◽  
Brown Trout ◽  
Indicator Species ◽  
Salmo Trutta ◽  
Parasite Species ◽  
Randomization Test ◽  
Indicator Species Analysis ◽  
Indicator Value ◽  
Species Analysis ◽  
Hydrographic Network

AbstractThe parasites of 484 brown trout,Salmo trutta, were studied between 2004 and 2007. An indicator value (IndVal) method was used for analysis, which combines measures of fidelity and specificity. Because of its resilience to detect changes in abundance, IndVal is an effective ecological bio-indicator. The IndVal method demonstrated that altitude, hydrographic network and season could influence the occurrence of parasite species in brown trout. A randomization test identified three parasite species as having a significant indicator value for altitude (the trematodeNicolla wisniewskii, and the nematodesSpinitectus gordoniandRhabdochona gnedini); five parasite species for hydrographic network (the trematodesNicolla testiobliquum,N. wisniewskii,Plagioporus stefanskii, and the nematodesS. gordoniandR. gnedini) and two parasite species for season (the nematodesS. gordoni, andR. gnedini). Data for species composition and infection levels should help to improve the monitoring and management of parasitism in salmonid populations.

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 Floristic composition and phytodiversity status of Sitakunda Ecopark, Chittagong, Bangladesh

2016 ◽  
Vol 5 (1) ◽  
pp. 29-45 ◽  
Author(s):  
Md Anwarul Islam ◽  
Mohammad Mahfuzur Rahman ◽  
Gazi Mosharof Hossain
Keyword(s):  
Species Composition ◽  
Plant Species ◽  
Monsoon Season ◽  
Vascular Plant ◽  
Floristic Composition ◽  
Diversity Indices ◽  
Vascular Plant Species ◽  
Plant Groups ◽  
Plant Families

The present study dealt with the exploration and documentation of the floristic composition and phyto-diversity of Sitakunda Eco-park, Chittagong, Bangladesh. A total of 412 vascular plant species under 315 genera belonging to 94 plant families have been recorded from the study area during February, 2013 to April, 2015. Out of these recorded taxa, 330 were dicotyledons, 62 were monocotyledons, 5 were gymnosperms and 15 were pteridophytes. Among those, the maximum 144 species belonged to herbs followed by 138, 75 and 55 species as trees, shrubs and climbers, respectively. The species composition among the plant families varied in plant groups. In dicotyledonous group, Euphorbiaceae appeared to be the largest family with 35 species, whereas Poaceae showed the largest family containing 30 species among monocotyledonous group. The highest values of both Shannon-Weiner and Simpson diversity indices have been observed as 3.82 and 0.98, respectively to site D during monsoon season, whereas the lowest values 3.19 and 0.95, respectively of these indices were recorded in site A during summer season.Jahangirnagar University J. Biol. Sci. 5(1): 29-45, 2016 (June)

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.

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