Search results for "System effects"

Volcanic CO2 seep geochemistry and use in understanding ocean acidification

2020

AbstractOcean acidification is one of the most dramatic effects of the massive atmospheric release of anthropogenic carbon dioxide (CO2) that has occurred since the Industrial Revolution, although its effects on marine ecosystems are not well understood. Submarine volcanic hydrothermal fields have geochemical conditions that provide opportunities to characterise the effects of elevated levels of seawater CO2 on marine life in the field. Here, we review the geochemical aspects of shallow marine CO2-rich seeps worldwide, focusing on both gas composition and water chemistry. We then describe the geochemical effects of volcanic CO2 seepage on the overlying seawater column. We also present new g…

Deregulation, liberalization and consolidation of the Mexican banking system: Effects on competition

2011

Este articulo analiza la evolucion de la competencia en el sistema bancario Mexicano en el periodo 1993-2005, periodo de desregulacion, liberalizacion y consolidacion del sector. Para ello se utilizan dos medidas de competencia derivadas de la teoria de la Organizacion Industrial: el indice de Lerner y el estadistico H de Panzar y Rosse. La evidencia empirica no permite rechazar la existencia de competencia monopolistica. El indice de Lerner muestra una disminucion en la rivalidad competitiva en el mercado de los depositos y un incremento en el mercado de los prestamos, observandose una estrategia de subsidiacion cruzada entre ambos mercados. Los resultados obtenidos cuestionan la efectivid…

Indirect effects of invasive crayfish on native fish parasites

2013

Interactions between invasive and native species are often modified by parasites. One little-studied scenario is that invasive species affect parasite transmission to native hosts by altering the relative abundance of hosts needed in parasite life cycles, for example by predation on these hosts. Here we show that presence of an invasive crayfish species, Pacifastacus leniusculus, decreases the mean abundance of native parasites transmitted from snails and aquatic isopods to perch, Perca fluviatilis, in two large boreal lakes in Finland. In contrast, parasites transmitted to the fish from planktonic copepods or mussels, hosts not readily preyed on by crayfish, were not affected by crayfish p…

Valproate and GABAergic system effects.

2003