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.

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

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 The Induction of Larval Resource Preference in Heterogeneous Habitats

2018 ◽  
Author(s):  
Vrinda Ravi Kumar ◽  
Swastika Issar ◽  
Deepa Agashe
Keyword(s):  
Habitat Heterogeneity ◽  
Food Sources ◽  
Mobile Species ◽  
Heterogeneous Habitats ◽  
Flour Beetles ◽  
Resource Preference ◽  
Induction Of Preference ◽  
Resource Patches ◽  
The Impact ◽  
Alternative Resource

ABSTRACTAnimals often have to evaluate and choose between multiple food sources in their habitat, and these potentially complex decisions can have a large impact on their fitness. Among other factors, previous experience with an alternative resource can significantly increase subsequent preference for the resource ("induction of preference"). Such induction of resource preference is particularly relevant in spatially or temporally heterogeneous habitats. Although most mobile species – especially generalists – probably frequently encounter habitat heterogeneity, the impact of preference induction on individual behaviour and fitness in heterogeneous habitats is poorly understood. We analysed larval preference induction in wheat-adapted generalist red flour beetles (Tribolium castaneum) under three types of habitat heterogeneity. We first analysed the induction of larval preference for novel resources (other cereal flours) under temporal heterogeneity, exposing larvae to new resources during development. We found that larvae preferred a new resource if they experienced it recently, but that the magnitude of induction varied across resources. Interestingly, we also observed specific induction for a homogenous mix of wheat and a novel resource, with larvae preferring the mix over either pure resource. To analyse induction under spatial heterogeneity, we placed beetle eggs in one of two alternative resource patches and tested the preference of emerged larvae. Unexpectedly, hatching into a novel resource did not always induce preference. Finally, we found that induction of preference for new resources could be maladaptive for larval development. Together, our work demonstrates that experience-based plasticity of larval resource choice may strongly impact larval preference and fitness in heterogeneous habitats.

scholarly journals Altitudinal patterns in breeding bird species richness and density in relation to climate, habitat heterogeneity, and migration influence in South Korea

2018 ◽  
Author(s):  
Jin-Yong Kim ◽  
Sanghun Lee ◽  
Man-Seok Shin ◽  
Chang-Hoon Lee ◽  
Changwan Seo ◽  
...  
Keyword(s):  
Species Richness ◽  
South Korea ◽  
Habitat Heterogeneity ◽  
Bird Species ◽  
Bird Diversity ◽  
Spring Temperature ◽  
Breeding Bird ◽  
Bird Species Richness ◽  
Main Driver ◽  
And Migration

Altitudinal patterns in the population ecology of mountain bird species are useful for predicting species occurrence and behavior. Numerous hypotheses about the complex interactions among environmental factors have been proposed; however, these remain controversial. This study investigated the causes of altitudinal patterns in breeding bird species richness and density in relation to climate, habitat heterogeneity, and migration influence in Jirisan National Park, South Korea. We conducted a field survey of 142 plots at altitudes between 200 and 1400 m above mean sea level in the breeding season. A total of 2771 individuals from 53 breeding bird species were recorded. Altitudinal patterns of species richness and density showed a hump-shaped pattern, indicating that the highest richness and density could be observed at moderate altitudes. Models constructed with 16 combinations of six variables demonstrated that species richness was positively correlated with vertical and horizontal habitat heterogeneity, and that density was positively correlated with vertical, but not horizontal, habitat heterogeneity, and negatively correlated with migrant rate. No significant relationships were found between spring temperature and species richness or density. Therefore, the observed patterns in species richness support the hypothesis that habitat heterogeneity, rather than climate, is the main driver of species richness. And neither habitat heterogeneity nor climate hypotheses fully explains the observed patterns in density. However, vertical habitat heterogeneity does likely help explain observed patterns in density. The heterospecific attraction hypothesis did not apply to the distribution of birds along the altitudinal gradient. Appropriate management of vertical habitat heterogeneity, such as vegetation cover, should be maintained for the conservation of bird diversity in this area.

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.

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