Author
Nicole Hagenah
Other affiliations: University of Groningen, University of KwaZulu-Natal, Wageningen University and Research Centre ...read more
Bio: Nicole Hagenah is an academic researcher from Mammal Research Institute. The author has contributed to research in topics: Species richness & Nutrient. The author has an hindex of 25, co-authored 47 publications receiving 2749 citations. Previous affiliations of Nicole Hagenah include University of Groningen & University of KwaZulu-Natal.
Topics: Species richness, Nutrient, Ecosystem, Biodiversity, Herbivore
Papers
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Commonwealth Scientific and Industrial Research Organisation1, Cooperative Institute for Research in Environmental Sciences2, University of Minnesota3, Queensland University of Technology4, Utah State University5, University of Washington6, University of California, San Diego7, United States Geological Survey8, University of KwaZulu-Natal9, University of Oxford10, Iowa State University11, University of Nebraska–Lincoln12, University of California, Berkeley13, University of Guelph14, University of Kentucky15, University of North Carolina at Chapel Hill16, Swiss Federal Institute for Forest, Snow and Landscape Research17, Lancaster University18
TL;DR: In this paper, the authors compared the diversity of plant, bacterial, archaeal and fungal communities in one hundred and forty-five 1 m 2 plots across 25 temperate grassland sites from four continents.
Abstract: Aboveground–belowground interactions exert critical controls on the composition and function of terrestrial ecosystems, yet the fundamental relationships between plant diversity and soil microbial diversity remain elusive. Theory predicts predominantly positive associations but tests within single sites have shown variable relationships, and associations between plant and microbial diversity across broad spatial scales remain largely unexplored. We compared the diversity of plant, bacterial, archaeal and fungal communities in one hundred and forty-five 1 m 2 plots across 25 temperate grassland sites from four continents. Across sites, the plant alpha diversity patterns were poorly related to those observed for any soil microbial group. However, plant beta diversity (compositional dissimilarity between sites) was significantly correlated with the beta diversity of bacterial and fungal communities, even after controlling for environmental factors. Thus, across a global range of temperate grasslands, plant diversity can predict patterns in the composition of soil microbial communities, but not patterns in alpha diversity.
526 citations
Utah State University1, University of Minnesota2, University of Oldenburg3, University of Zurich4, Iowa State University5, Oregon State University6, United States Geological Survey7, Wake Forest University8, University of Washington9, Colorado State University10, University of Queensland11, University of New Mexico12, Lanzhou University13, University of California, San Diego14, Dartmouth College15, Imperial College London16, University of Wisconsin-Madison17, University of Colorado Boulder18, United States Department of Agriculture19, Queensland University of Technology20, University of Maryland, College Park21, University of KwaZulu-Natal22, Yale University23, Agricultural Research Service24, University of St. Thomas (Minnesota)25, University of Nebraska–Lincoln26, University of Guelph27, University of Kentucky28, University of North Carolina at Chapel Hill29, University of Melbourne30, La Trobe University31, Commonwealth Scientific and Industrial Research Organisation32, Swiss Federal Institute for Forest, Snow and Landscape Research33, Lancaster University34, Open University35, Duke University36, University of California, Davis37
TL;DR: This article conducted a standardized sampling in 48 herbaceous-dominated plant communities on five continents and found no clear relationship between productivity and fine-scale (meters−2) richness within sites, within regions, or across the globe.
Abstract: For more than 30 years, the relationship between net primary productivity and species richness has generated intense debate in ecology about the processes regulating local diversity. The original view, which is still widely accepted, holds that the relationship is hump-shaped, with richness first rising and then declining with increasing productivity. Although recent meta-analyses questioned the generality of hump-shaped patterns, these syntheses have been criticized for failing to account for methodological differences among studies. We addressed such concerns by conducting standardized sampling in 48 herbaceous-dominated plant communities on five continents. We found no clear relationship between productivity and fine-scale (meters−2) richness within sites, within regions, or across the globe. Ecologists should focus on fresh, mechanistic approaches to understanding the multivariate links between productivity and richness.
509 citations
Agricultural Research Service1, Commonwealth Scientific and Industrial Research Organisation2, University of Nebraska–Lincoln3, University of Washington4, University of Minnesota5, University of Guelph6, Utah State University7, Trinity College, Dublin8, Lanzhou University9, University of California, Los Angeles10, University of New Mexico11, University of Colorado Boulder12, University of Illinois at Urbana–Champaign13, Queensland University of Technology14, University of Maryland, College Park15, University of KwaZulu-Natal16, Utrecht University17, University of North Carolina at Chapel Hill18, Colorado State University19, Chinese Academy of Sciences20, University of Kentucky21, Monash University22, La Trobe University23, Swiss Federal Institute for Forest, Snow and Landscape Research24, Lancaster University25, University of California, Davis26
TL;DR: It is suggested that multiple-nutrient constraints must be considered when assessing the ecosystem-scale consequences of nutrient enrichment, and significant variations in the type and degree of nutrient limitation are pointed to.
Abstract: Terrestrial ecosystem productivity is widely accepted to be nutrient limited(1). Although nitrogen (N) is deemed a key determinant of aboveground net primary production (ANPP) 2,3, the prevalence of co-limitation by N and phosphorus (P) is increasingly recognized(4-8). However, the extent to which terrestrial productivity is co-limited by nutrients other than N and P has remained unclear. Here, we report results from a standardized factorial nutrient addition experiment, in which we added N, P and potassium (K) combined with a selection of micronutrients (K+mu), alone or in concert, to 42 grassland sites spanning five continents, and monitored ANPP. Nutrient availability limited productivity at 31 of the 42 grassland sites. And pairwise combinations of N, P, and K+mu co-limited ANPP at 29 of the sites. Nitrogen limitation peaked in cool, high latitude sites. Our findings highlight the importance of less studied nutrients, such as K and micronutrients, for grassland productivity, and point to significant variations in the type and degree of nutrient limitation. We suggest that multiple-nutrient constraints must be considered when assessing the ecosystem-scale consequences of nutrient enrichment.
383 citations
Helmholtz Centre for Environmental Research - UFZ1, Martin Luther University of Halle-Wittenberg2, University of Minnesota3, Queensland University of Technology4, Utah State University5, Utrecht University6, University of Oldenburg7, University of Guelph8, Iowa State University9, University of Washington10, University of Toronto11, University of Buenos Aires12, Sun Yat-sen University13, University of California, San Diego14, University of California, Santa Barbara15, University of Colorado Boulder16, University of KwaZulu-Natal17, University of California, Berkeley18, University of Kentucky19, Monash University20, La Trobe University21, Commonwealth Scientific and Industrial Research Organisation22, Lancaster University23, Yale University24
TL;DR: In this paper, the authors show that plant species diversity decreased when a greater number of limiting nutrients were added across 45 grassland sites from a multi-continent experimental network, even after controlling for effects of plant biomass, and even where biomass production was not nutrient-limited.
Abstract: Niche dimensionality provides a general theoretical explanation for biodiversity-more niches, defined by more limiting factors, allow for more ways that species can coexist. Because plant species compete for the same set of limiting resources, theory predicts that addition of a limiting resource eliminates potential trade-offs, reducing the number of species that can coexist. Multiple nutrient limitation of plant production is common and therefore fertilization may reduce diversity by reducing the number or dimensionality of belowground limiting factors. At the same time, nutrient addition, by increasing biomass, should ultimately shift competition from belowground nutrients towards a one-dimensional competitive trade-off for light. Here we show that plant species diversity decreased when a greater number of limiting nutrients were added across 45 grassland sites from a multi-continent experimental network. The number of added nutrients predicted diversity loss, even after controlling for effects of plant biomass, and even where biomass production was not nutrient-limited. We found that elevated resource supply reduced niche dimensionality and diversity and increased both productivity and compositional turnover. Our results point to the importance of understanding dimensionality in ecological systems that are undergoing diversity loss in response to multiple global change factors.
330 citations
Utrecht University1, University of Minnesota2, Martin Luther University of Halle-Wittenberg3, University of Guelph4, Lancaster University5, Utah State University6, National Scientific and Technical Research Council7, University of Washington8, Michigan State University9, Trinity College, Dublin10, University of Toronto11, University of Lisbon12, University of Buenos Aires13, Sun Yat-sen University14, University of Sydney15, Commonwealth Scientific and Industrial Research Organisation16, University of Queensland17, University of Oulu18, Agricultural Research Service19, Queensland University of Technology20, University of KwaZulu-Natal21, University of Oldenburg22, University of Nebraska–Lincoln23, Smithsonian Institution24, University of Kentucky25, La Trobe University26, University of Tartu27, Charles Sturt University28, Swiss Federal Institute for Forest, Snow and Landscape Research29, University of Leeds30, Tata Institute of Fundamental Research31, Murdoch University32, University of Oxford33
TL;DR: Analysis of 65 grasslands worldwide from the Nutrient Network experiment reveals that plant communities with higher α- and β-diversity have higher levels of ecosystem multifunctionality, and that this effect is amplified across scales.
Abstract: Biodiversity is declining in many local communities while also becoming increasingly homogenized across space. Experiments show that local plant species loss reduces ecosystem functioning and services, but the role of spatial homogenization of community composition and the potential interaction between diversity at different scales in maintaining ecosystem functioning remains unclear, especially when many functions are considered (ecosystem multifunctionality). We present an analysis of eight ecosystem functions measured in 65 grasslands worldwide. We find that more diverse grasslands—those with both species-rich local communities (α-diversity) and large compositional differences among localities (β-diversity)—had higher levels of multifunctionality. Moreover, α- and β-diversity synergistically affected multifunctionality, with higher levels of diversity at one scale amplifying the contribution to ecological functions at the other scale. The identity of species influencing ecosystem functioning differed among functions and across local communities, explaining why more diverse grasslands maintained greater functionality when more functions and localities were considered. These results were robust to variation in environmental drivers. Our findings reveal that plant diversity, at both local and landscape scales, contributes to the maintenance of multiple ecosystem services provided by grasslands. Preserving ecosystem functioning therefore requires conservation of biodiversity both within and among ecological communities.
158 citations
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TL;DR: Fungi typically live in highly diverse communities composed of multiple ecological guilds, and FUNGuild is a tool that can be used to taxonomically parse fungal OTUs by ecological guild independent of sequencing platform or analysis pipeline.
2,290 citations
Proceedings Article•
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TL;DR: The main focus in MUCKE is on cleaning large scale Web image corpora and on proposing image representations which are closer to the human interpretation of images.
Abstract: MUCKE aims to mine a large volume of images, to structure them conceptually and to use this conceptual structuring in order to improve large-scale image retrieval. The last decade witnessed important progress concerning low-level image representations. However, there are a number problems which need to be solved in order to unleash the full potential of image mining in applications. The central problem with low-level representations is the mismatch between them and the human interpretation of image content. This problem can be instantiated, for instance, by the incapability of existing descriptors to capture spatial relationships between the concepts represented or by their incapability to convey an explanation of why two images are similar in a content-based image retrieval framework. We start by assessing existing local descriptors for image classification and by proposing to use co-occurrence matrices to better capture spatial relationships in images. The main focus in MUCKE is on cleaning large scale Web image corpora and on proposing image representations which are closer to the human interpretation of images. Consequently, we introduce methods which tackle these two problems and compare results to state of the art methods. Note: some aspects of this deliverable are withheld at this time as they are pending review. Please contact the authors for a preview.
2,134 citations
TL;DR: Although most soil microorganisms remain undescribed, the field is now poised to identify how to manipulate and manage the soil microbiome to increase soil fertility, improve crop production and improve the understanding of how terrestrial ecosystems will respond to environmental change.
Abstract: Soil microorganisms are clearly a key component of both natural and managed ecosystems. Despite the challenges of surviving in soil, a gram of soil can contain thousands of individual microbial taxa, including viruses and members of all three domains of life. Recent advances in marker gene, genomic and metagenomic analyses have greatly expanded our ability to characterize the soil microbiome and identify the factors that shape soil microbial communities across space and time. However, although most soil microorganisms remain undescribed, we can begin to categorize soil microorganisms on the basis of their ecological strategies. This is an approach that should prove fruitful for leveraging genomic information to predict the functional attributes of individual taxa. The field is now poised to identify how we can manipulate and manage the soil microbiome to increase soil fertility, improve crop production and improve our understanding of how terrestrial ecosystems will respond to environmental change.
1,720 citations
TL;DR: Elton's "The Ecology of Invasions by Animals and Plants" as mentioned in this paper is one of the most cited books on invasion biology, and it provides an accessible, engaging introduction to the most important environmental crises of our time.
Abstract: Much as Rachel Carson's \"Silent Spring\" was a call to action against the pesticides that were devastating bird populations, Charles S. Elton's classic \"The Ecology of Invasions by Animals and Plants\" sounded an early warning about an environmental catastrophe that has become all too familiar today-the invasion of nonnative species. From kudzu to zebra mussels to Asian long-horned beetles, nonnative species are colonizing new habitats around the world at an alarming rate thanks to accidental and intentional human intervention. One of the leading causes of extinctions of native animals and plants, invasive species also wreak severe economic havoc, causing $79 billion worth of damage in the United States alone. Elton explains the devastating effects that invasive species can have on local ecosystems in clear, concise language and with numerous examples. The first book on invasion biology, and still the most cited, Elton's masterpiece provides an accessible, engaging introduction to one of the most important environmental crises of our time. Charles S. Elton was one of the founders of ecology, who also established and led Oxford University's Bureau of Animal Population. His work has influenced generations of ecologists and zoologists, and his publications remain central to the literature in modern biology. \"History has caught up with Charles Elton's foresight, and \"The Ecology of Invasions\" can now be seen as one of the central scientific books of our century.\"-David Quammen, from the Foreword to \"Killer Algae: The True Tale of a Biological Invasion\
1,321 citations