Temporal and spatial variation of limnological variables and biomass of different macrophyte species in a Neotropical reservoir (São Paulo - Brazil)

Aim: This study reports an investigation of limnological characteristics and aquatic macrophyte occurrence in a neotropical reservoir in order to assess the spatio-temporal variation of water and sediment variables and their influence on plant distribution. Methods: Macrophytes, water and sediment samples were collected from a Brazilian reservoir in different seasons from four main arms of the reservoir. In total sixteen water-sediment variables were analyzed including N:P ratio and Trophic State Index. The plants were collected using a quadrat sampling procedure and the dry weight per sample was measured. MANOVA was performed to evaluate spatial and temporal variation of environmental variables as well as seasonal biomass differences. To assess the relationship among environmental variables and macrophytes an ordination analysis (using Canonical Correspondence Analysis: CCA) was carried out. Results: The spatial and temporal variation of limnological variables generated a heterogeneous system which supports the presence of different species of macrophyte. pH, dissolved oxygen and sediment composition were important predictors of Polygonum lapathifolium occurrence while nutrients were associated with Eichhornia crassipes and Pistia stratiotes. Inorganic substances were related to biomass variation of Eichhornia azurea and Myriophyllum aquaticum. Conclusions: The spatial variation of the environmental variables has caused heterogeneity in the reservoir and it may support the occurrence of different species of macrophyte. Limnological variables highlighted in CCA are important to predict the species occurrence and their control in the study area

Within and Between Group Variation of Individual Strategies in Common Pool Resources: Evidence from Field Experiments

With data from framed common pool resource experiments conducted with artisanal fishing communities in Colombia, we estimate a hierarchical linear model to investigate within-group and between-group variation in individual harvest strategies across several institutions. Our results suggest that communication serves to effectively coordinate individual strategies within groups, but that these coordinated strategies vary considerably across groups. In contrast, weakly enforced regulatory restrictions on individual harvests (as well as unregulated open access) produce significant variation in the individual strategies within groups, but these strategies are roughly replicated across groups so that there is little between-group variation.common pool resources, field experiments, communication, regulation, hierarchical linear models

What Motivates Common Pool Resource Users? Experimental Evidence from the Field

This paper develops and tests several models of pure Nash strategies of individuals who extract from a common pool resource when they are motivated by a combination of self-interest and other motivations such as altruism, reciprocity, inequity aversion and conformism. We test whether an econometric summary of subjects’ strategies is consistent with one of these motivations using data from a series of common pool resource experiments conducted in three regions of Colombia. As expected, average extraction levels are less than that predicted by a model of pure self-interest, but are nevertheless sub-optimal. Moreover, we find that a model of conformism with monotonically increasing best response functions best describes average strategies. Our empirical results are inconsistent with models of altruism, reciprocity and inequity aversion.common pool resources, experiments, altruism, reciprocity, conformism

Centralized and Decentralized Management of Local Common Pool Resources in the Developing World: Experimental Evidence from Fishing Communities in Colombia

This paper uses experimental data to test for a complementary relationship between formal regulations imposed on a community to conserve a local natural resource and nonbinding verbal agreements to do the same. Our experiments were conducted in the field in three regions of Colombia. Each group of five subjects played 10 rounds of an open access common pool resource game, and 10 additional rounds under one of five institutions— communication alone, two external regulations that differed by the level of enforcement, and communication combined with each of the two regulations. Our results suggest that the hypothesis of a complementary relationship between communication and external regulation is supported for some combinations of regions and regulations, but cannot be supported in general. We therefore conclude that the determination of whether formal regulations and informal communication are complementary must be made on a community-by-community basis.common pool resources, experiments, institutions, communication, regulation

Relationship between Discontinuation of Anti-depressant Medication During Pregnancy and Development of Postpartum Depression

Postpartum depression (PPD) is a serious and potentially debilitating disorder that frequently goes undetected due to stigma and a lack of understanding about its course and etiology. The factor of particular interest to this study concerns the relationship between discontinuation of anti-depressant medication in pregnancy and the development of PPD. The study examined how the variables of pregnancy mood, child care stress, emotional support, instrumental support, marital satisfaction, history of depression, baby temperament, birth experience, and medication status affect symptoms of postpartum depression (PPD) in a sample of 202 patients at the six-week postpartum check-up. In addition to a demographic and mood questionnaire, the Postpartum Depression Screening Scale (PDSS) was used to measure symptoms of postpartum depression. Prenatal depression, child care stress, history of depression, baby temperament, and birth experience correlated significantly with PPD. Significant inverse correlations were found between PPD and emotional support, instrumental support, marital satisfaction, and medication status. Hierarchical multiple regression indicated that pregnancy mood, child care stress, emotional support, and marital satisfaction predicted a significant amount of the variance in postpartum depression scores

The Introduction of Smart Meters in Ireland: Privacy Implications and the Role of Privacy by Design

Abstract included in text

Data retention in the aftermath of Digital Rights Ireland and Seitlinger

In a high profile decision delivered in April 2014, the Grand Chamber of the Court of Justice of the European Union (CJEU) found the Data Retention Directive1 to be in breach of the EU Charter of Fundamental Rights (EU Charter).2 This article examines the impact of the ruling in Digital Rights Ireland across the EU and considers how the Irish legislature should respond to this decision in a manner that maintains the appropriate balance between the investigatory aims of the government and the protection of fundamental rights