On the Benefits of Including Age-structure in Harvest Control Rules

This paper explores the benefits of including age-structure in the control rule (HCR) when decision makers regard their (age-structured) models as approximations. We find that introducing age structure into the HCR reduces both the volatility of the spawning biomass and the yield. Although at a fairly imprecise level the benefits are lower, there are still major advantages for actual assessment precision of the case study. Moreover, we find that when age-structure is included in the HCR the relative ranking of different policies in terms of variance in biomass and yield does not differ. These results are shown both theoretically and numerically by applying the model to the Southern Hake fishery.

La civilización vasca medieval: vida(s), cotidiana(s), mentalidad(es) y cultura(s)

[ES]A lo largo de las páginas de este trabajo se pasa revista a diversas cuestiones que permiten realizar una aproximación a las diversas formas de vida cotidiana y mentalidad del País Vasco y Navarra durante los siglos bajomedievales. Esas cuestiones aluden al primum vivere, al ciclo vital, al control de la vida privada de los individuos y pública de las comunidades por parte de las autoridades, las fiestas, las supersticiones y distintos aspectos relativos a la cultura, como literatura, historiografía y arte.

Leizarragaren "Kalendrera": ariera eta korapiloak

[ES] De las menos estudiadas de su época y no siempre adecuadamente valorada, la pequeña obra Kalendrera (La Rochelle, 1571) es una de las escasas joyas que nos han legado las iglesias reformadas europeas del siglo XVI. Breve y aparentemente sencillo y sin artificio, esta Kalendrera o calendario calvinista dispuesto por Joanes Leizarraga se dibuja entreverado de datos diversos y de, a su vez,sutiles carencias de información que bien merecen la atención del lector. Al objeto de iniciar un análisis más exhaustivo de sus fuentes y motivaciones, el presente artículo se propone mostrar la problemática que, tanto desde la perspectiva ideológico-religiosa como desde la estrictamente cultural, concentra el trabajo del beskoiztarra. No es preciso añadir que, para ello, se necesita en primer término comenzar por profundizar en el funcionamiento y comprensión de los mecanismos mismos del Kalendrera.

Institutional designs to face the dark side of total allowable catches

Setting total allowable catches (TACs) is an endogenous process in which different agents and institutions, often with conflicting interests and opportunistic behaviour, try to influence policy-makers. Such policy-makers, far from being the benevolent social planners many would wish them to be, may also pursue self-interest when making final decisions. Although restricted knowledge of stock abundance and population dynamics, and weakness in enforcement, have effects, these other factors may explain the reason why TAC management has failed to guarantee sustainable exploitation of fish resources. Rejecting the exogeneity of the TAC and taking advantage of fruitful debate on economic policy (i.e. the rules vs. discretion debate, and that surrounding the independence of central banks), two institutional developments are analysed as potential mechanisms to face up to misconceptions about TACs: long-term harvest control rules, and a central bank of fish.

Molecular Antennas and Photoactive Nanomaterials based on Energy Transfer Processes

110 p.