Constraints on Energy Intake in Fish: The Link between Diet Composition, Energy Metabolism, and Energy Intake in Rainbow Trout

The hypothesis was tested that fish fed to satiation with iso-energetic diets differing in macronutrient composition will have different digestible energy intakes (DEI) but similar total heat production. Four iso-energetic diets (2×2 factorial design) were formulated having a contrast in i) the ratio of protein to energy (P/E): high (HP/E) vs. low (LP/E) and ii) the type of non-protein energy (NPE) source: fat vs. carbohydrate which were iso-energetically exchanged. Triplicate groups (35 fish/tank) of rainbow trout were hand-fed each diet twice daily to satiation for 6 weeks under non-limiting water oxygen conditions. Feed intake (FI), DEI (kJ kg−0.8 d−1) and growth (g kg−0.8 d−1) of trout were affected by the interaction between P/E ratio and NPE source of the diet (P<0.05). Regardless of dietary P/E ratio, the inclusion of carbohydrate compared to fat as main NPE source reduced DEI and growth of trout by ∼20%. The diet-induced differences in FI and DEI show that trout did not compensate for the dietary differences in digestible energy or digestible protein contents. Further, changes in body fat store and plasma glucose did not seem to exert a homeostatic feedback control on DEI. Independent of the diet composition, heat production of trout did not differ (P>0.05). Our data suggest that the control of DEI in trout might be a function of heat production, which in turn might reflect a physiological limit related with oxidative metabolism

The political cost of public–private partnerships: Theory and evidence from Colombian infrastructure development

Our mixed-methods design explores the notion of failure, and identifies the conditions under which it happens. The first phase of our research employs documentary analysis and semi-structured expert interviews and identifies project cancellation as capturing the most severe occurrences of failure. A second phase statistically analyzes a unique World Bank dataset capturing the provisions of over 4,000 infrastructure PPPs launched between 1990-2015 in 89 countries. We find robust evidence supporting the theoretical claim that PPPs are less likely to be cancelled in countries with more veto points in their political institutions to restrain politicians from intervening in policy implementation

Justice and rule of law failure in Haiti: A view from the Shanties

Since 1995, significant investments have been made in justice reform initiatives in Haiti. The results, however, have been meager. Drawing upon data from a longitudinal study conducted in Cité Soleil between 2008 and 2011, this article illuminates the short‐sightedness of top‐down reforms that fail to meet the demands of the population, leaving them to fend for themselves. In the absence of a viable justice system Cité Soleil residents have resorted to alternative, and at times pathological, measures to exact some level of “justice”. In this article, we contend that an empirically grounded base of knowledge of the demand side of justice and the promotion of trust‐building strategies that engage the active participation of citizens in the country are necessary to enact and sustain justice and rule of law reform. Such an approach will create a venue to channel civil society's demands, build political will and facilitate coordination between stakeholders and Haitian society for self‐sustained rule of law institutions and long‐term peace building in Haiti