Relationship between Diversity and Stability of a Karst Plant Community

The relationships among species diversity, functional diversity, functional redundancy, and community stability are central to community and ecosystem ecology. This paper examines plant communities at different stages of vegetation restoration in the Guizhou karst plateau to study the relationship among functional diversity, functional redundancy, and stability of plant communities. The most important results include the following. (1) Species diversity (SD), functional redundancy (FR), and stability (STB) gradually increased with restoration, and there were significant differences among the different stages; functional diversity (FD) increased at first and then decreased, and reached the highest level at the tree irrigation stage. (2) Plant height (PLH) and specific leaf area (SLA) were functional traits that affected the diversity and stability of the plant community, and PLH was positively correlated with plant community diversity and stability, while SLA was negatively correlated with plant community diversity and stability. (3) During the community recovery, FD and FR interacted to maintain stability. In the early and late stages of recovery, the effect of functional redundancy on stability was greater than that of functional diversity, but it was the opposite in the middle stages. (4) The tree irrigation stage is the likely point at which the species diversity of plant communities in karst areas reached saturation, and the growth rate of functional redundancy after species diversity saturation was greater than that before saturation.

Marine bioinvasions: bivalve molluscs introduced in northeast Brazil

ABSTRACT: Invasive alien species are those that, once introduced from other environments, adapt, starting to reproduce and proliferate in places they did not previously inhabit. The introduction of exotic marine species as a result of anthropic activity, whether intentionally or not, is a process that has been remote for centuries, which makes it difficult to assess the impact of these activities, making studies that address the status of knowledge about such organisms always important. Thus, this research aims to gather information about bivalve molluscs introduced into marine ecosystems in northeastern Brazil, in addition to discussing the knowledge of this invasive fauna for the Northeast, Southeast and South regions of Brazil. For that there was a search for bibliography in 5 databases - SciELO, Web of Science, Google Scholar, ScienceResearch.com and I3N Brazil Database of the Horus Institute for Environmental Conservation and Development. Three invasive bivalves for the northeastern region of Brazil were counted. When compared to the South and Southeast regions, the Northeast presents a significant amount of research on the ecology of the species Isognomon bicolor (C. B. Adams, 1845) and Mytilopsis leucophaeata (Conrad, 1831), which is very important, because with these results it is possible to track and understand the pathways that make bioinvasions possible. Regarding Perna Perna (Linnaeus, 1758), although there is a discussion about its supposed introduction in Brazilian waters, the species can be considered invasive in Northeastern Brazil. KEYWORDS: Invasive species, marine ecosystem, ecology.

Filling the Information Gap in Meta-Ecosystem Ecology

Fluxes of matter, energy, and information over space and time contribute to ecosystems’ functioning. The meta-ecosystem framework addresses the dynamics of ecosystems linked by these fluxes, however, to date, meta-ecosystem research focused solely on fluxes of energy and matter, neglecting information. This is problematic due to organisms’ varied responses to information, which influence local ecosystem dynamics and can alter spatial flows of energy and matter. Furthermore, information itself can move between ecosystems. Therefore, information should contribute to meta-ecosystem dynamics, such as stability and productivity. Specific subdisciplines of ecology currently consider different types of information (e.g., social and cultural information, natural and artificial light or sound, body condition, genotype, and phenotype). Yet neither the spatiotemporal distribution of information nor its perception are currently accounted for in general ecological theories. Here, we provide a roadmap to synthesize information and meta-ecosystem ecology. We begin by defining information in a meta-ecological context. We then review and identify challenges to be addressed in developing information meta-ecology. Finally, we present new hypotheses for how information could impact dynamics across scales of spatio-temporal and biological organization.

Modern Durgas Fighting against the Demons of Globalization

The analysis presented here focuses on the way the antithesis between the global and the local is approached from a literary point of view in the contemporary Indian context. Assuming an ecocritical perspective, it reinterprets literature on ecological themes as a tool to negotiate some spaces of autonomy from hegemonic models imposed by globalization on an economic, technological and cultural level. Global plans often collide with local ecosystems, upsetting their pre-existent equilibrium and always more frequently producing antagonism, resistance and overt conflicts. The claim for the management of local resources and the safeguard of traditional lore become a response to the “allegedly value-neutral global market” (Eaton / Lorentzen (eds.) (2003): Ecofeminism and Globalization: Exploring Culture, Context, and Religion. Lanham: Rowman & Littlefield Publishers Inc., 4). Filtering the discussion through an ecofeminist critique, it is possible to find a connection between the abuse of power that underlies human oppression and the exploitation of the environment. Women and nature are, in fact, connected in the dominant masculine discourse by the rhetoric of submission, which is harmful to both of them (Zimmerman, et al. (ed.) (1993): Environmental Philosophy: from Animal Rights to Radical Ecology. Englewood Cliffs, New Jersey: Prentice-Hall.; Warren / Cheney. (1991): “Ecological Feminism and Ecosystem Ecology”. Hypatia 6/1 Ecological Feminism: 179–197.). As an example of resistance strategy to these dynamics and a means to give voice to women through literature, this article proposes a critical reading of the novel Betvā bahtī rahī by Maitreyī Puṣpā (“The Betvā River was flowing”).