Effects of growth rate, size, and light availability on tree survival across life stages: a demographic analysis accounting for missing values and small sample sizes.

The data set supporting the results of this article is available in the Dryad repository, http://dx.doi.org/10.5061/dryad.6f4qs. Moustakas, A. and Evans, M. R. (2015) Effects of growth rate, size, and light availability on tree survival across life stages: a demographic analysis accounting for missing values.Plant survival is a key factor in forest dynamics and survival probabilities often vary across life stages. Studies specifically aimed at assessing tree survival are unusual and so data initially designed for other purposes often need to be used; such data are more likely to contain errors than data collected for this specific purpose

An ecological future for weed science to sustain crop production and the environment. A review

Sustainable strategies for managing weeds are critical to meeting agriculture's potential to feed the world's population while conserving the ecosystems and biodiversity on which we depend. The dominant paradigm of weed management in developed countries is currently founded on the two principal tools of herbicides and tillage to remove weeds. However, evidence of negative environmental impacts from both tools is growing, and herbicide resistance is increasingly prevalent. These challenges emerge from a lack of attention to how weeds interact with and are regulated by the agroecosystem as a whole. Novel technological tools proposed for weed control, such as new herbicides, gene editing, and seed destructors, do not address these systemic challenges and thus are unlikely to provide truly sustainable solutions. Combining multiple tools and techniques in an Integrated Weed Management strategy is a step forward, but many integrated strategies still remain overly reliant on too few tools. In contrast, advances in weed ecology are revealing a wealth of options to manage weedsat the agroecosystem levelthat, rather than aiming to eradicate weeds, act to regulate populations to limit their negative impacts while conserving diversity. Here, we review the current state of knowledge in weed ecology and identify how this can be translated into practical weed management. The major points are the following: (1) the diversity and type of crops, management actions and limiting resources can be manipulated to limit weed competitiveness while promoting weed diversity; (2) in contrast to technological tools, ecological approaches to weed management tend to be synergistic with other agroecosystem functions; and (3) there are many existing practices compatible with this approach that could be integrated into current systems, alongside new options to explore. Overall, this review demonstrates that integrating systems-level ecological thinking into agronomic decision-making offers the best route to achieving sustainable weed management

Basic Challenges for Governance in Emergencies

What are emergencies and why do they matter? In this chapter (in its penultimate version), I seek to outline the morally significant features of the concept of emergency, and demonstrate how these features generate corresponding first- and second-order challenges and responsibilities for those in a position to do something about them. In section A, I contend that emergencies are situations in which there is a risk of serious harm and a need to react urgently if that harm is to be averted or minimized. These conceptual features matter morally, since it is precisely to them that those who invoke emergencies to justify otherwise impermissible actions tend to appeal. The basic first-order challenge facing emergency responders is two-fold. It is, first, to identify how these features shape circumstances of action in ways that affect (or do not affect) which reasons for action and which corresponding courses of conduct are justifiably available to them. In situations when emergency responders are compelled to make authoritative determinations due to significant contestability and indeterminacies in the contours or materialization of the said features, their challenge is then also to make these determinations legitimately. In section B, I argue that second-order challenges having to do with the foreseeability of emergencies, the value(s) of exposure to them, and their preventability further compound the predicament of emergency responders. I conclude, in section C, by saying a few words about one last morally salient feature shared by many, though not all, emergencies considered in the chapter — namely, their public dimension