The stabilisation and transportation of dissolved iron from high temperature hydrothermal vent systems

Iron (Fe) binding phases in two hydrothermal plumes in the Southern Ocean were studied using a novel voltammetric technique. This approach, reverse titration–competitive ligand exchange–adsorptive cathodic stripping voltammetry, showed that on average 30±21% of dissolved Fe in the hydrothermal plumes was stabilised by chemically labile binding to ligands. The conditional stability constant (log K′FeL) of the observed complexes was 20.61±0.54 (mean±1 SD) for the two vent sites, intermediate between previous measurements of deep ocean ligands (21.4–23; Kondo et al., 2012) and dissolved weak estuarine ligands (<20; Gerringa et al., 2007). Our results indicate that approximately 7.5% of all hydrothermal Fe was stabilised by complexation with ligands. Furthermore, 47±26% of the dissolved Fe in the plume existed in the colloidal size range (0.02–0.2 µm). Our data suggests that a portion (∼7.5%) of hydrothermal Fe is sufficiently stabilised in the dissolved size fraction (<0.2 µm) to make an important impact on deep ocean Fe distributions. Lateral deep ocean currents transport this hydrothermal Fe as lenses of enhanced Fe concentrations away from mid ocean ridge spreading centres and back arc basins

Dancing amidst the flames: Imagination and self-organization in a minor key

Drawing from Deleuze and Guattari's (1986) formulation of the concept of a 'minor literature' and Nick Thoburn's extension of this into a 'minor politics' (2003a) this paper examines the relation between the workings of the imagination and forms of self-organization found within anticapitalist organizing of the Industrial Workers of the World and related movements. This paper explores the modulations of the social imaginary found within these particular examples as indicative of a more general process of minor composition. Rather than affirming an already existing and known subjective position (of the people, the workers), it will be argued that rather such campaigns have playfully and strategically redirected and appropriated the social energies found within pop culture to articulate their demands. Copyright © 2008 SAGE Publications

Ecoacoustics: the Ecological Investigation and Interpretation of Environmental Sound

none2sìThe sounds produced by animals have been a topic of research into animal behaviour for a very long time. If acoustic signals are undoubtedly a vehicle for exchanging information between individuals, environmental sounds embed as well a significant level of data related to the ecology of populations, communities and landscapes. The consideration of environmental sounds for ecological investigations opens up a field of research that we define with the term ecoacoustics. In this paper, we draw the contours of ecoacoustics by detailing: the main theories, concepts and methods used in ecoacoustic research, and the numerous outcomes that can be expected from the ecological approach to sound. Ecoacoustics has several theoretical and practical challenges, but we firmly believe that this new approach to investigating ecological processes will generate abundant and exciting research programsrestrictedSueur, Jérôme; Farina, AlmoSueur, Jérôme; Farina, Alm