The presence of unsupervised dogs in urban areas close to sites of high natural value can have negative effects on wildlife. On the Patagonian coast, where cities are often surrounded by natural environments, this problem may affect seabird colonies. Two islands with Magellanic Penguin (Spheniscus magellanicus) colonies belonging to a protected area neighboring Puerto Deseado, Santa Cruz, suffered attacks by unsupervised dogs. In 2016 and 2022, several dogs reached these islands during low tides and attacked penguins. At Isla Quiroga, 421 penguins died in 2016, causing a decrease of 21.4% in its population. At Isla Quinta, 30 individuals died in 2016 and 32 in 2022, representing in both cases almost 100% of the colony. These are the first records of attacks since we are monitoring these colonies (>30 years). The growth of coastal cities is constant and these events could become more frequent and affect more species of seabirds. The control of unsupervised dogs in natural areas near coastal developments is a challenge that government entities should respond to in the short term.
Phone/Fax : +54 0297 4854888Abstron: I n evolutionary algorithms based on genetics, the crossover operation creates individuals by exchange of genes. Seleclion mechanisms propitiate reproduction of better individuals imposing P direction on the search process: copier of better individuals replace worst ones. Consequently, part of the genetic material contained in these worst individuals vanisher forever. This loss of divemi@ can lead to B premature convergence. To prevent an early convergence to a local optimum under the same selection mechanism then, either a larger population sue or adequate genetic operators m e needed. Multirecombination daws multiple crossover operations on two or more parents each time a new individual is created.I n this work we show the influence on genetic diversity, quality of ICEUIS and required computational effort, when applying different crossover methods to a set of hard instances, selected as a test case, ofthe weighted tardiness scheduling problem in Single machine environments under multire-combined approaches. A description of the multirecombination variant used, experiments and preliminary results me reported. 0-7803-85 15-2/04/$20.00 0 2 0 0 4 IEEE
Bajo ciertas circunstancias los carnívoros pueden matar muchas más presas de las que pueden consumir, este comportamiento se denomina “matanza excedente”. En verano de 2018 se encontraron grandes bandadas de Choiques (Rhea pennata pennata) pastoreando en campos linderos a Puerto Deseado, en la Reserva Provincial Ría Deseado, e incluso ingresando a la localidad. Al mismo tiempo se registraron altas densidades de Perros (Canis lupus familiaris) no supervisados en la ciudad. Como resultado de este solapamiento ocurrió una matanza de 68 Choiques por esas jaurías. Este es el primer registro de matanza excedente de choiques por pe- rros en Argentina. Considerar la influencia de perros no supervisados es fundamental para diseñar estrategias de conservación de las especies silvestres, en particular en la periferia de ambientes urbanos.
El crecimiento poblacional y la aparición de nuevas tecnologías (que han mejorado el bienestar humano) (Índice de desarrollo humano, s.f) han producido una mayor demanda energética. Igualmente se ha observado una actitud de “derroche energético” como se los puede observar en el siguiente enlace (Derroche energético: ¿cuál es la situación actual?, s.f). Se estudiará los hábitos energéticos en una casa-tipo (consumo y demanda) con el objetivo de cuantificar la energía necesaria (demanda) y parte de ella obtenerla con recursos no convencionales renovables. Se procederá a realizar una breve descripción de las fuentes renovables a utilizar (solar, eólica y biomasa) y a través del estudio, que se ha realizado, ver los equipos posibles a instalar en esta casa-tipo. Al mismo tiempo, comprenderemos el porqué del uso de este tipo de tecnologías en locaciones un tanto apartadas de los medios convencionales de energías.
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