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Search Results: 1 - 10 of 220487 matches for " ALEJANDRO PéREZ-MATUS "
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Applying Fishers' Ecological Knowledge to Construct Past and Future Lobster Stocks in the Juan Fernández Archipelago, Chile
Tyler D. Eddy,Jonathan P. A. Gardner,Alejandro Pérez-Matus
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0013670
Abstract: Over-exploited fisheries are a common feature of the modern world and a range of solutions including area closures (marine reserves; MRs), effort reduction, gear changes, ecosystem-based management, incentives and co-management have been suggested as techniques to rebuild over-fished populations. Historic accounts of lobster (Jasus frontalis) on the Chilean Juan Fernández Archipelago indicate a high abundance at all depths (intertidal to approximately 165 m), but presently lobsters are found almost exclusively in deeper regions of their natural distribution. Fishers' ecological knowledge (FEK) tells a story of serial depletion in lobster abundance at fishing grounds located closest to the fishing port with an associated decline in catch per unit effort (CPUE) throughout recent history. We have re-constructed baselines of lobster biomass throughout human history on the archipelago using historic data, the fishery catch record and FEK to permit examination of the potential effects of MRs, effort reduction and co-management (stewardship of catch) to restore stocks. We employed a bioeconomic model using FEK, fishery catch and effort data, underwater survey information, predicted population growth and response to MR protection (no-take) to explore different management strategies and their trade-offs to restore stocks and improve catches. Our findings indicate that increased stewardship of catch coupled with 30% area closure (MR) provides the best option to reconstruct historic baselines. Based on model predictions, continued exploitation under the current management scheme is highly influenced by annual fluctuations and unsustainable. We propose a community-based co-management program to implement a MR in order to rebuild the lobster population while also providing conservation protection for marine species endemic to the Archipelago.
Plasticity in feeding selectivity and trophic structure of kelp forest associated fishes from northern Chile Plasticidad en la selección de alimento y estructura trófica de los peces asociados a bosques de macroalgas pardas del norte de Chile
ALEJANDRO PéREZ-MATUS,SHIRLEY PLEDGER,FRANCISCO J DíAZ,LARA A FERRY
Revista chilena de historia natural , 2012,
Abstract: One of the primary ways in which species interact with their environment is through foraging; thereby directly consuming some fraction of their surrounding habitat. The habitat itself, in turn, may dictate the types of foraging opportunities that are available to the inhabitants. To investigate the relationship between habitat availability and diet composition of habitat-associated fishes, we estimated the relative abundance of the potential sessile and mobile prey items and the diet of the fish species assemblage associated to kelp forest. Specifically, diet and feeding selectivity of the kelp-forest associated fish assemblage were determined by calculating Manly's alpha selectivity index. We determined the diet of kelp forest associated fishes and their foraging behavior by comparing prey availability with those items present in the stomachs of fishes captured by gill net and spear gun. We calculated the degree of dietary overlap among fishes from four locations along the northern coast of Chile. Results indicate that utilization of prey by predators is predominantly affected by potential prey availability. With the exception of the two carnivorous species such as Pinguipes chilensis (Valenciennes, 1883) and Paralabrax humeralis (Cuvier & Valenciennes, 1828), whose diet did not change among sites, all other kelp-associated fishes changed their dietary habitats to consistent with the availability of local resources. Benthic resources changed among the different study sites, which led to differing diets even in the same species from different locations. Eleven of the 12 kelp forest fishes also showed some selectively for benthic prey. We conclude that the ability of fishes to be plastic in their feeding preference and, therefore, partition the benthic resources may set adaptations to co-exist in a dynamic environment such as kelp forest. Una de las principales formas en que las especies interactúan con su medio ambiente es a través de la alimentación, consumiendo directamente una fracción de los componentes del hábitat circundante. El propio hábitat, a su vez, puede determinar la conducta de forrajeo y los tipos de alimentación de sus depredadores. Para investigar la relación entre la disponibilidad de alimento y la composición de la dieta de los peces asociados a hábitat dominados por macroalgas pardas, se estimó la abundancia de las presas potenciales tanto especies sésiles como móviles y se comparó con la dieta de las especies de los peces en cuatro diferentes sitios de la costa del norte de Chile. Se determinó la dieta de los peces y su plasticidad a
Plasticity in feeding selectivity and trophic structure of kelp forest associated fishes from northern Chile
PéREZ-MATUS,ALEJANDRO; PLEDGER,SHIRLEY; DíAZ,FRANCISCO J; FERRY,LARA A; VáSQUEZ,JULIO A;
Revista chilena de historia natural , 2012, DOI: 10.4067/S0716-078X2012000100003
Abstract: one of the primary ways in which species interact with their environment is through foraging; thereby directly consuming some fraction of their surrounding habitat. the habitat itself, in turn, may dictate the types of foraging opportunities that are available to the inhabitants. to investigate the relationship between habitat availability and diet composition of habitat-associated fishes, we estimated the relative abundance of the potential sessile and mobile prey items and the diet of the fish species assemblage associated to kelp forest. specifically, diet and feeding selectivity of the kelp-forest associated fish assemblage were determined by calculating manly's alpha selectivity index. we determined the diet of kelp forest associated fishes and their foraging behavior by comparing prey availability with those items present in the stomachs of fishes captured by gill net and spear gun. we calculated the degree of dietary overlap among fishes from four locations along the northern coast of chile. results indicate that utilization of prey by predators is predominantly affected by potential prey availability. with the exception of the two carnivorous species such as pinguipes chilensis (valenciennes, 1883) and paralabrax humeralis (cuvier & valenciennes, 1828), whose diet did not change among sites, all other kelp-associated fishes changed their dietary habitats to consistent with the availability of local resources. benthic resources changed among the different study sites, which led to differing diets even in the same species from different locations. eleven of the 12 kelp forest fishes also showed some selectively for benthic prey. we conclude that the ability of fishes to be plastic in their feeding preference and, therefore, partition the benthic resources may set adaptations to co-exist in a dynamic environment such as kelp forest.
Conservación arquitectónica prehispánica I: Arquitectura maya
Villalobos Pérez, Alejandro
Informes de la Construccion , 1989,
Abstract: No dispone
LA POLíTICA EN SU ECLIPSE (AVATARES DE LA TEORíA POLíTICA ANGLOSAJONA)
Alejandro Escudero Pérez
Nómadas , 2009,
Abstract:
Rare Decays with Missing Energy at SuperB
Alejandro Pérez
Physics , 2010,
Abstract: The study of rare B-decays at SuperB provides unique opportunities to understand the Standard Model and to constrain new physics. It is discussed the new physics potential of the B -> K\nu\nu and B -> K^*\nu\nu system from the proposed SuperB experiment with 75ab-1 of data (5 nominal years of data taking).
Status, open problems and prospects of the decay B^+ -> l^+ nu_l
Alejandro Pérez
Physics , 2010,
Abstract: The study of rare B-decays at SuperB provides unique opportunities to understand the Standard Model and constrain new physics. We discuss the new physics potential of the leptonic B^+ -> l^+ nu_l decays from the proposed SuperB experiment with 75ab-1 of data (5 nominal years of data taking).
The SuperB factory: Physics Prospects and Project Status
Luis Alejandro Pérez Pérez
Physics , 2012,
Abstract: I will briefly review of some highlights of the SuperB physics programme, the status of the accelerator and detector studies, and the future plans.
Escuela de Medicina Santiago, Chile
Aravena,Alejandro; Pérez,Fernando;
ARQ (Santiago) , 2005, DOI: 10.4067/S0717-69962005005900007
Abstract: at different times the periphery has offered empty space and room to move. the drive to expand, to the colonies of the new world and now to the edges of crowded cities, was associated with an image of the future free from previous existences, very different from the reality of the centers, where the present of things past, things present and things future inescapably shapes the architecture.
Senderos de la evolución humana
Pérez Ochoa Real Alejandro
Indivisa : Boletin de Estudios e Investigación , 2006,
Abstract:
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