{"title":"Temporal Changes in Morphological Traits in a Population of Echinacea pallida in the Tall Grass Prairie Preserve, Oklahoma","authors":"J. Arévalo, Adam K. Ryburn, Soni Jaiswal","doi":"10.2174/1874213001104010001","DOIUrl":null,"url":null,"abstract":"We analyzed the structure and spatial temporal changes of a population of Echinacea pallida in the Tall Grass Prairie Preserve of Oklahoma. Plants were classified into different categories based on total leaf length and transition probabilities for three periods (1997-1998, 1998-1999, 1999-2000) and were used to determine temporal changes. The analysis of transition probabilities among different size classes for the three periods allowed us to discriminate the transition probabilities matrices. A univariate spatial analysis of individuals showed significant aggregation for most distances greater than 40 cm; from 0 to 40 cm the spatial distribution of stems did not differ (p>0.05) from a random distribution. Aggregation increased from year 1 to year 4 of the study period, which seems to be related to an increase in density.Although we did not have a control site, results for both years with previous burning strongly suggest the effect of fire in the population dynamic.","PeriodicalId":39335,"journal":{"name":"Open Ecology Journal","volume":"4 1","pages":"1-9"},"PeriodicalIF":0.0000,"publicationDate":"2011-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Open Ecology Journal","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.2174/1874213001104010001","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"Environmental Science","Score":null,"Total":0}
引用次数: 0
Abstract
We analyzed the structure and spatial temporal changes of a population of Echinacea pallida in the Tall Grass Prairie Preserve of Oklahoma. Plants were classified into different categories based on total leaf length and transition probabilities for three periods (1997-1998, 1998-1999, 1999-2000) and were used to determine temporal changes. The analysis of transition probabilities among different size classes for the three periods allowed us to discriminate the transition probabilities matrices. A univariate spatial analysis of individuals showed significant aggregation for most distances greater than 40 cm; from 0 to 40 cm the spatial distribution of stems did not differ (p>0.05) from a random distribution. Aggregation increased from year 1 to year 4 of the study period, which seems to be related to an increase in density.Although we did not have a control site, results for both years with previous burning strongly suggest the effect of fire in the population dynamic.
期刊介绍：
The Open Ecology Journal is an open access online journal which embraces the trans-disciplinary nature of ecology, seeking to publish original research articles, reviews, letters and guest edited single topic issues representing important scientific progress from all areas of ecology and its linkages to other fields. The journal also focuses on the basic principles of the natural environment and its conservation. Contributions may be based on any taxa, natural or artificial environments, biodiversity, spatial scales, temporal scales, and methods that advance this multi-faceted and dynamic science. The Open Ecology Journal also considers empirical and theoretical studies that promote the construction of a broadly applicable conceptual framework or that present rigorous tests or novel applications of ecological theory.
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