A fully reproductive fighting morph in a soldier clade of gall-inducing thrips (Oncothrips morrisi)

We present the first life history data for Oncothrips morrisi, a species in a clade of haplodiploid, Australian gall-inducing thrips that has a micropteran fighting morph in the first generation of the gall. Micropterans in other species in the clade have lower fecundity than their mother, and these species are considered eusocial. There is no such reproductive skew in O. morrisi, and the species is not eusocial by any definition. The volume of O. morrisi galls is between 4 and 20 times greater in than eusocial species in the clade and the dispersing-brood size varies between 5 and 15 times larger than that of other species. The lack of skew in O. morrisi could be associated with large gall volume, reducing competition between females for space and feeding sites for their offspring. As O. morrisi is in a lineage basal to eusocial Oncothrips, we also discuss selective factors for the evolution of a non-dispersing fighting morph in this clade. The costs involved in dispersal and latency to reproduction may have lowered the selective threshold for the evolution of a non-dispersing morph. Once non-dispersal evolved, selection to defend one's offspring may have promoted the evolution of soldier-like morphology and behaviour.     

Multilevel water,biodiversity and climate adaptation governance: evaluating adaptive management in Lesotho

In many cases in which climate change affects natural resources, impacts are uncertain and adaptation to climate change often involves collective action problems at the local level, which are embedded in multilevel governance regimes. Adaptive management (AM) is an emerging approach to deal with such uncertainty and complexity by promoting multilevel institutions that are robust to change and able to learn. Much of the literature evaluating AM in multilevel governance regimes, however, focuses only on the adherence to certain structural features said to make AM successful, leaving aside the question whether AM actually produces desired outcomes. This paper evaluates AM in multilevel regimes also in terms of the outcomes they produce. To this end, we first apply the Management and Transition Framework (MTF) in order to describe three multilevel regimes in Lesotho. For each regime we then observe whether it adheres to the structure features of AM. Finally, we evaluate the extent to which the outcomes, natural resource management projects, are conducive to Ostrom's (1990) ‘design principles’ for sustainable common-pool resource management. We find that, though no ideal ‘adaptive regime’ is found in Lesotho, the results confirm the AM hypotheses that decentralised decision-making, open information sources, and plurality of user interests lead to improved outcomes. Conversely, elements of the climate regime are found not to be adaptive. Our findings also confirm the appropriateness of AM as a governance approach to climate adaptation.     

From spatial models to spatial evaluation in the analysis of wetland restoration in the Vecht river basin

Water tables are strictly controlled throughout much of the Netherlands. Higher water tables could permit the restoration of wetland ecosystems. Deriving benefits from this requires the spatial matching of physical planning, eco-hydrological processes, and economic activities. This paper reports on a study combining spatial analysis and disciplinary integration to assess management strategies for the Vecht river basin in the Netherlands. The paper addresses two research questions. How can the information generated by spatial models be condensed into performance indicators for the evaluation of strategies? How can spatial information be retained in the evaluation, and does this lead to different rankings and/or insights? Procedures for the construction of performance indicators for three criteria – net present value, environmental quality and spatial equity – are presented. The evaluation concludes that recreation and higher water tables provide a means for restoration, recouping of costs, and stimulating regional incomes. Maintenance of spatial detail led to different insights, and in particular indicated uncertainty about this conclusion.