On the species-pool hypothesis and on the quasi-neutral concept of plant community diversity

2001 ◽  
Vol 36 (1) ◽  
pp. 3-8 ◽  
Author(s):  
Kristjan Zobel

Oikos ◽  
1993 ◽  
Vol 68 (2) ◽  
pp. 371 ◽  
Author(s):  
Ove Eriksson


PLoS ONE ◽  
2021 ◽  
Vol 16 (1) ◽  
pp. e0244982
Author(s):  
Christina Alba ◽  
Richard Levy ◽  
Rebecca Hufft

In this age of rapid biodiversity loss, we must continue to refine our approaches to describing variation in life on Earth. Combining knowledge and research tools from multiple disciplines is one way to better describe complex natural systems. Understanding plant community diversity requires documenting both pattern and process. We must first know which species exist, and where (i.e., taxonomic and biogeographic patterns), before we can determine why they exist there (i.e., ecological and evolutionary processes). Floristic botanists often use collections-based approaches to elucidate biodiversity patterns, while plant ecologists use hypothesis-driven statistical approaches to describe underlying processes. Because of these different disciplinary histories and research goals, floristic botanists and plant ecologists often remain siloed in their work. Here, using a case study from an urban greenway in Colorado, USA, we illustrate that the collections-based, opportunistic sampling of floristic botanists is highly complementary to the transect- or plot-based sampling of plant ecologists. We found that floristic sampling captured a community species pool four times larger than that captured using ecological transects, with rarefaction and non-parametric species estimation indicating that it would be prohibitive to capture the “true” community species pool if constrained to sampling within transects. We further illustrate that the discrepancy in species pool size between approaches led to a different interpretation of the greenway’s ecological condition in some cases (e.g., transects missed uncommon cultivated species escaping from nearby gardens) but not others (e.g., plant species distributions among functional groups were similar between species pools). Finally, we show that while using transects to estimate plant relative abundances necessarily trades off with a fuller assessment of the species pool, it is an indispensable indicator of ecosystem health, as evidenced by three non-native grasses contributing to 50% of plant cover along the highly modified urban greenway. We suggest that actively fostering collaborations between floristic botanists and ecologists can create new insights into the maintenance of species diversity at the community scale.







2020 ◽  
Vol 117 (9) ◽  
pp. 4464-4470 ◽  
Author(s):  
Susan Harrison ◽  
Marko J. Spasojevic ◽  
Daijiang Li

Climate strongly shapes plant diversity over large spatial scales, with relatively warm and wet (benign, productive) regions supporting greater numbers of species. Unresolved aspects of this relationship include what causes it, whether it permeates to community diversity at smaller spatial scales, whether it is accompanied by patterns in functional and phylogenetic diversity as some hypotheses predict, and whether it is paralleled by climate-driven changes in diversity over time. Here, studies of Californian plants are reviewed and new analyses are conducted to synthesize climate–diversity relationships in space and time. Across spatial scales and organizational levels, plant diversity is maximized in more productive (wetter) climates, and these consistent spatial relationships are mirrored in losses of taxonomic, functional, and phylogenetic diversity over time during a recent climatic drying trend. These results support the tolerance and climatic niche conservatism hypotheses for climate–diversity relationships, and suggest there is some predictability to future changes in diversity in water-limited climates.



2020 ◽  
Vol 11 ◽  
Author(s):  
Angang Ming ◽  
Yujing Yang ◽  
Shirong Liu ◽  
You Nong ◽  
Yi Tao ◽  
...  


Fire Ecology ◽  
2019 ◽  
Vol 15 (1) ◽  
Author(s):  
Eva K. Strand ◽  
Kevin L. Satterberg ◽  
Andrew T. Hudak ◽  
John Byrne ◽  
Azad Henareh Khalyani ◽  
...  


2004 ◽  
Vol 19 (4) ◽  
pp. 277-287 ◽  
Author(s):  
Suzanne W. Simard ◽  
Jean L. Heineman ◽  
Shannon M. Hagerman ◽  
W. Jean Mather ◽  
Donald L. Sachs

Abstract Five-year growth and survival responses of lodgepole pine and hybrid spruce to manual cutting of Sitka alder were studied in two montane vegetation complexes in interior British Columbia. The effects of brushing on plant community diversity and structure also were examined. Alder cover and height were reduced throughout the 5-year posttreatment measurement period, but this had no effect on growth or survival of either 5- to 7-year-old lodgepole pine growing in the Dry Alder complex or 4- to 7-year-old hybrid spruce in the Wet Alder complex. Moderate alder cover, which was characteristic at these sites, did not appear to inhibit diameter growth of lodgepole pine or spruce. This was supported by competition thresholds for conifer diameter of 30 and 37% alder cover in the Dry Alder and Wet Alder complexes, respectively. In neither complex did manual cutting result in any changes in species richness, species diversity, or structural diversity of the vascular plant community. The results of this study suggest that brushing of Sitka alder is unnecessary for release of healthy lodgepole pine growing on mesic sites in the Dry Alder complex and is ineffective at alleviating growth limiting factors to spruce on Wet Alder sites. West. J. Appl. For. 19(4):277–287.



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