Tina Heger

Tina Heger
Leibniz-Institute of Freshwater Ecology and Inland Fisheries | IGB · Department of Ecosystem Research

PhD

About

90
Publications
26,202
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
1,529
Citations
Additional affiliations
July 2011 - September 2012
University of California, Davis
Position
  • Visiting Scientist
March 2010 - present
Technische Universität München
Position
  • Research Associate

Publications

Publications (90)
Article
In ecology, a hypothesis is usually not discarded if a few studies reject it, as long as there are other studies supporting it. How to assess the usefulness of ecological hypotheses is therefore not straightforward. Using the enemy release hypothesis as an example, we show how creating a hierarchy of hypotheses (HoH) can help reviewing and evaluati...
Article
Full-text available
Invasion ecology addresses the spread of species outside of their native ranges. A central aim of this field is to find mechanistic explanations for why species are able to establish and spread in an area in which they did not evolve. Usually it remains unclear, however, what exactly is meant by ‘mechanistic explanation’ or ‘mechanism’. The paper a...
Article
Full-text available
In the age of advanced information systems powering fast-paced knowledge economies that face global societal challenges, it is no longer adequate to express scholarly information - an essential resource for modern economies - primarily as article narratives in document form. Despite being a well-established tradition in scholarly communication, PDF...
Article
Full-text available
Information on restoration science and practice is dispersed across large numbers of scientific papers, reports, books, and other resources, and there is a lack of synthetic approaches and of linkages between ecological theory and practice. With recent calls for scaling up ecological restoration, there is an urgent need for improving the effectiven...
Article
The ongoing global biodiversity crisis not only involves biological extinctions, but also the loss of experience and the gradual fading of cultural knowledge and collective memory of species. We refer to this phenomenon as 'societal extinction of species' and apply it to both extinct and extant taxa. We describe the underlying concepts as well as t...
Article
available open access, just click on the DOI above, or go here: https://zenodo.org/communities/zukunftsbilder/?page=1&size=20
Article
Full-text available
available open access, just click on the DOI above, or go here: https://zenodo.org/communities/zukunftsbilder/?page=1&size=20
Article
available open access, just click on the DOI above, or go here: https://zenodo.org/communities/zukunftsbilder/?page=1&size=20
Article
Biodiversity in urban ecosystems has the potential to increase ecosystem functions and support a suite of services valued by society, including services provided by soils. Specifically, the sequestration of carbon in soils has often been advocated as a solution to mitigate the steady increase of CO2 concentration in the atmosphere as a key driver o...
Article
Full-text available
Developing a precise argument is not an easy task. In real-world argumentation scenarios, arguments presented in texts (e.g. scientific publications) often constitute the end result of a long and tedious process. A lot of work on computational argumentation has focused on analyzing and aggregating these products of argumentation processes, i.e. arg...
Article
Full-text available
Research synthesis on simple yet general hypotheses and ideas is challenging in scientific disciplines studying highly context-dependent systems such as medical, social, and biological sciences. This study shows that machine learning, equation-free statistical modeling of artificial intelligence, is a promising synthesis tool for discovering novel...
Preprint
Full-text available
Global change has been predominantly studied from the prism of ‘how much’ rather than ‘how fast’ change occurs. The paradigm underlying the former assumes that a smooth change in an environmental driver can force a regime shift between alternative states (Bifurcation-tipping). This presupposes that environmental conditions change at a rate which al...
Article
Full-text available
Species spreading beyond their native ranges are important study objects in ecology and environmental sciences and research on biological invasions is thriving. Along with an increase in the number of publications, the research field is experiencing an increase in the diversity of methods applied and questions asked. This development has facilitate...
Article
Full-text available
Biological invasions are on the rise, and their global impacts on ecosystems, economies and human health are a major challenge. Invasion science is critical to mitigate invader impacts, yet due to the strong increase of data and information in this area, it has become difficult to acquire and maintain an overview of the field. As a result, existing...
Article
Full-text available
In the current era of Big Data, existing synthesis tools such as formal meta-analyses are critical means to handle the deluge of information. However, there is a need for complementary tools that help to (a) organize evidence, (b) organize theory, and (c) closely connect evidence to theory. We present the hierarchy-of-hypotheses (HoH) approach to a...
Chapter
With a rapidly growing body of knowledge, it becomes more and more difficult to keep track of the state of the art in a research field. A formal representation of the hypotheses in the field, their relations, the studies that support or question them based on which evidence, would greatly ease this task and help direct future research efforts. We p...
Article
Einer der Hauptauslöser des weltweiten dramatischen Verlusts von Biodiversität ist die intensive Landnutzung – Naturschutz und Landwirtschaft scheinen miteinander unvereinbare Gegensätze zu sein. Die Idee, Mensch und Natur als sich entgegenstehend aufzufassen, war lange Zeit dominierend, sowohl in der wissenschaftlichen Ökologie als auch in der Umw...
Preprint
Full-text available
With a rapidly growing body of knowledge, it becomes more and more difficult to keep track of the state of the art in a research field. A formal representation of the hypotheses in the field, their relations, the studies that support or question them based on which evidence, would greatly ease this task and help direct future research efforts. We p...
Article
Full-text available
Viele meinen, wir leben in einer Wissensgesellschaft. Tatsächlich aber entstehen aus den vielen Daten und Informationen, die wir erheben, zu selten echtes Wissen und Verständnis. Ein Grund dafür ist unsere Orientierungslosigkeit in fast allen Disziplinen außer unserer eigenen. Ein möglicher Ausweg ist ein frei zugänglicher interaktiver Wissenschaft...
Article
Full-text available
Anthropogenic changes in climate, land use and disturbance regimes, as well as introductions of non‐native species can lead to the transformation of many ecosystems. The resulting novel ecosystems are usually characterized by species assemblages that have not occurred previously in a given area. Quantifying the ecological novelty of communities (i....
Article
Full-text available
Background and aims: Since its emergence in the mid-20th century, invasion biol- ogy has matured into a productive research field addressing questions of fundamen- tal and applied importance. Not only has the number of empirical studies increased through time, but also has the number of competing, overlapping and, in some cases, contradictory hypot...
Article
Full-text available
Research synthesis on simple yet general hypotheses and ideas is challenging in scientific disciplines studying highly context‐dependent systems such as medical, social, and biological sciences. This study shows that machine learning, equation‐free statistical modeling of artificial intelligence, is a promising synthesis tool for discovering novel...
Article
Full-text available
Urbanization is driving the transformation of natural and rural ecosystems worldwide by affecting both the abiotic environment and the biota. This raises the question whether urban ecosystems are able to provide services in a comparable way to their non-urban counterparts. In urban grasslands, the effects of urbanization-driven ecological novelty a...
Article
Full-text available
Anthropogenic changes in climate, land use, and disturbance regimes, as well as introductions of non-native species can lead to the transformation of many ecosystems. The resulting novel ecosystems are usually characterized by species assemblages that have not occurred previously in a given area. Quantifying the ecological novelty of communities (i...
Preprint
Full-text available
Anthropogenic changes in climate, land use and disturbance regimes, as well as introductions of non-native species can lead to the transformation of many ecosystems. The resulting novel ecosystems are usually characterized by species assemblages that have not occurred previously in a given area. Quantifying the ecological novelty of communities (i....
Article
Full-text available
(1) Environmental conditions experienced in the past may lead to intraspecific differences in ecological and chemical traits of plants, which likely affect future responses to altered or new environments. Whether competition by neighbors is such a trait-shaping factor is not yet well-known. We aimed to understand how the level of ancestral plant co...
Article
Full-text available
Topos 108: 90-93 -- https://www.toposmagazine.com/zeitschriften/topos-108-displacement/ Native species are a common good and must be protected, whereas non-native species are less valued: that is the traditional view of nature conservation. But there are also contradicting opinions: invasive species have benefits, too. Against the background of...
Article
Full-text available
Global change has complex eco-evolutionary consequences for organisms and ecosystems, but related concepts (e.g., novel ecosystems) do not cover their full range. Here we propose an umbrella concept of “ecological novelty” comprising (1) a site-specific and (2) an organismcentered, eco-evolutionary perspective. Under this umbrella, complementary op...
Preprint
In the current era of Big Data, existing synthesis tools (e.g. formal meta-analysis) are useful for handling the deluge of data and information. However, there is a need for complementary tools that help to (i) structure data and information, (ii) closely connect evidence to theory and (iii) further develop theory. We present the hierarchy-of-hypot...
Article
Ecological effects of alien species can be dramatic, but management and prevention of negative impacts are often hindered by crypticity of the species or their ecological functions. Ecological functions can change dramatically over time, or manifest after long periods of an innocuous presence. Such cryptic processes may lead to an underestimation o...
Article
Full-text available
Rapid local adaptation frequently occurs during the spread of invading species. It remains unclear, however, how consistent, and therefore potentially predictable, such patterns of local adaptation are. One approach to this question is to measure patterns of local differentiation in functional traits and plasticity levels in invasive species in mul...
Chapter
Positive interactions among species can be central for community structure and ecosystem functioning. Given the current scenario of species invasions worldwide, the question arises of how non-native species will interact in the new environment. Such reasoning has led to the invasional meltdown hypothesis (IM) which states that non-native species fa...
Technical Report
Full-text available
Nach Artikel 13 Abs. 1 der EU-VO muss jeder Mitgliedstaat bis Anfang 2018 eine Untersuchung und Priorisierung der nicht vorsätzlichen Pfade der Einbringung und Ausbreitung der Arten der Unionsliste für sein Hoheitsgebiet vorlegen. Als Priorisierungskriterien werden in der EU-VO das Artenvolumen oder der potenzielle Schaden vorgeschlagen. In der vor...
Article
Zur Umsetzung der Verordnung (EU) Nr. 1143/2014 ist es notwendig, die wichtigsten Pfade der nicht vorsätzlichen Einbringung und Ausbreitung der Arten auf der so genannten „Unionsliste“ für Deutschland zu identifizieren. Auf Grundlage des standardisierten Pfad-Klassifikationsschemas des Übereinkommens über die biologische Vielfalt (CBD) wurden im vo...
Book
There are many hypotheses describing the interactions involved in biological invasions, but it is largely unknown whether they are backed up by empirical evidence. This book fills that gap by developing a tool for assessing research hypotheses and applying it to twelve invasion hypotheses, using the hierarchyof- hypotheses (HoH) approach, and mappi...
Article
Full-text available
Negative interactions have been suggested as a major barrier for species arriving in a new habitat. More recently, positive interactions drew attention from community assembly theory and invasion science. The invasional meltdown hypothesis (IMH) introduced the idea that positive interactions among non-native species could facilitate one another’s i...
Article
Full-text available
Disturbed areas offer great opportunities for restoring native biodiversity, but they are also prone to invasion by alien plants. Following the limiting similarity hypothesis, we address the question whether or not similarity of plant functional traits helps developing seed mixtures of native communities with higher resistance to invasive species a...
Article
Full-text available
Germination, a crucial phase in the life cycle of a plant, can be significantly influenced by competition and facilitation. The aim of this study was to test whether differences in cover of surrounding vegetation can lead to population differentiation in germination behaviour of an annual grassland species, and if so, whether such a differentiation...
Article
Full-text available
Germination, a crucial phase in the life cycle of a plant, can be significantly influenced by competition and facilitation. The aim of this study was to test whether differences in cover of surrounding vegetation can lead to population differentiation in germination behaviour of an annual grassland species, and if so, whether such a differentiation...
Chapter
This book, containing 18 chapters, combines the hierarchy-of-hypotheses (HoH) approach with hypothesis networks for invasion biology. This book aims to further develop the HoH approach by inviting critical comments (Part I), apply it to 12 major invasion hypotheses (Part II) and explore how it can be expanded to a hierarchically structured hypothes...
Chapter
This book, containing 18 chapters, combines the hierarchy-of-hypotheses (HoH) approach with hypothesis networks for invasion biology. This book aims to further develop the HoH approach by inviting critical comments (Part I), apply it to 12 major invasion hypotheses (Part II) and explore how it can be expanded to a hierarchically structured hypothes...
Chapter
This book, containing 18 chapters, combines the hierarchy-of-hypotheses (HoH) approach with hypothesis networks for invasion biology. This book aims to further develop the HoH approach by inviting critical comments (Part I), apply it to 12 major invasion hypotheses (Part II) and explore how it can be expanded to a hierarchically structured hypothes...
Chapter
This book, containing 18 chapters, combines the hierarchy-of-hypotheses (HoH) approach with hypothesis networks for invasion biology. This book aims to further develop the HoH approach by inviting critical comments (Part I), apply it to 12 major invasion hypotheses (Part II) and explore how it can be expanded to a hierarchically structured hypothes...
Chapter
This book, containing 18 chapters, combines the hierarchy-of-hypotheses (HoH) approach with hypothesis networks for invasion biology. This book aims to further develop the HoH approach by inviting critical comments (Part I), apply it to 12 major invasion hypotheses (Part II) and explore how it can be expanded to a hierarchically structured hypothes...
Article
Full-text available
Beitrag im Tagungsband der internationalen Fachtagung in Göttingen 2017 "Kreuzkräuter und Naturschutz", Nr. 23 der DVL-Schriftenreihe "Landschaft als Lebensraum"
Chapter
Full-text available
You can download the whole book here: http://www.in-tree.org/uploads/images/book/Introduced_tree_species_EN_HighRes.pdf
Chapter
Acknowledging the fact that organisms never evolve in isolation, Zilber-Rosenberg and Rosenberg emphasized the concept of the holobiont, comprising a host organism together with all of its associated microorganisms. Considering the holobiont as being a unit of selection, the hologenome theory of evolution then leads to incorporate Lamarckian aspect...
Article
For plants competing for light, grasslands represent complex environments. Grassland microhabitats vary in the amount of available light and in the spatial distribution of patches with full sunlight, light shade and deep shade. Plant populations have been shown to adapt to specific competitors and shading conditions, but it is an open question how...
Article
Full-text available
Invasion ecology tends to treat taxonomic groups separately. However, given that all invasive species go through the same stages of the invasion process (transport, escape, establishment, spread), it is likely that—across taxa—comparable traits help to success-fully complete this process ("invasion traits"). Perhaps not all invasive species have th...
Conference Paper
Background/Question/Methods Major ecological hypotheses are typically formulated to be broadly applicable, e.g. across taxonomic groups and habitats. This is also true for hypotheses about invasive alien species. For example, the biotic resistance hypothesis (also known as diversity-invasibility hypothesis) posits that ecosystems with high biodiv...
Article
Full-text available
Invasive alien species are a significant element of global change with negative ecological and economic effects. The invasion process is structured in four stages (transport, colonization, establishment, landscape spread) which are determined by geographic, abiotic, biotic and landscape filters. For these stages, we used some recent research to des...
Article
Full-text available
Invasion ecology has much advanced since its early beginnings. Nevertheless, explanation, prediction, and management of biological invasions remain difficult. We argue that progress in invasion research can be accelerated by, first, pointing out difficulties this field is currently facing and, second, looking for measures to overcome them. We see b...
Article
Full-text available
Invasion ecology has made considerable progress in identifying specific mechanisms that potentially determine success and failure of biological invasions. Increasingly, efforts are being made to interrelate or even synthesize the growing number of hypotheses in order to gain a more comprehensive and integrative understanding of invasions. We argue...
Article
Invasion research today integrates active fields like biogeography, nature conservation, ecology, and evolutionary biology, and each of these fields contributes its own conceptual and terminological background. In this essay we advance the view that this is the reason why discussions on terminology keep flaring up time and time again. Our basic arg...
Conference Paper
Background/Question/Methods Despite the large amount of information on plant adaptation to physical stressors in the environment, there is remarkably little information on the role of competition as an agent of selection. Spatial variation in the composition of plant communities likely represents a complex selective mosaic of interactions that ma...
Article
Full-text available
Several major hypotheses have been proposed to explain and predict biological invasions, but the general applicability of these hypotheses is largely unknown, as most of them have not been evaluated using a standard approach across taxonomic groups and habitats. We offer such an evaluation for six selected leading hypotheses. Our global literature...
Chapter
Das Konzept der »Zwischenstadt«, wie Thomas Sieverts die verstädterte Landschaft oder verlandschaftete Stadt genannt hat, wird seit etwa 15 Jahren im deutschsprachigen Raum unter Planern und Architekten sehr kontrovers diskutiert. Vera Vicenzotti unternimmt eine Neuordnung des Fachdiskurses über die Zwischenstadt, die die vorherrschende Oberflächli...
Conference Paper
Background/Question/Methods Biological invasions are processes influenced by many different, often interacting factors. Each case of invasion has its specific history during which specific circumstances lead to the success of the invasive species. In the face of the wealth of interacting factors the question arises whether it is possible to develo...
Technical Report
Full-text available
Revised version of 2006 report on Senecio inaequidens
Article
Full-text available
Fallopia japonica has spread widely in Germany. It grows mainly on the banks of brooks and rivers, but also on ruderal sites. The massive appearance of F. japonica along rivers up to now is concentrated on distinct regions. At these locations it forms extended dense stands, exerting great competitive pressure upon the rest of the vegetation. F. ja...
Article
Full-text available
Since the 1970's, the neophyte Narrow-leafed Ragwort (Senecio inaequidens DC.) has spread rapidly in Central Europe, particularly in Germany. The species grows on roadsides and railway embankments, on urban wasteland, slag heaps, construction sites and other disturbed locations. This study reviews literature on the invasion of S. inaequidens in Cen...
Article
There are various approaches to explain the mechanisms of biological invasions. It is possible (1) to focus on the characteristics of invading species and (2) on those of the ecosystems invaded, (3) to investigate t