Alberto Pilati

Alberto Pilati
Universidad Nacional de La Pampa · Department of Natural Resources

Ph. D. Zoology

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21
Publications
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476
Citations

Publications

Publications (21)
Article
La planta de tratamientos de líquidos cloacales de Trenque Lauquen fue creada en 1992 cuando la población era sustancialmente menor. El objetivo fue determinar la eficiencia de retención de la misma ya que sus efluentes podrían causar un fuerte impacto negativo sobre el cuenco receptor. Para evaluar la eficiencia en condiciones extremas de temperat...
Article
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Dinámica de un florecimiento algal otoñal en un lago hipereutrófico urbano de la región pampeana semiárida (Argentina). En este trabajo, se reporta un raro florecimiento fitoplanctónico otoñal en un lago somero de la región semiárida pampeana (Argentina). La biomasa fitoplanctónica presentó un solo pico otoñal, seguido dos meses más tarde por un pi...
Article
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Animals can be important in modulating ecosystem-level nutrient cycling, although their importance varies greatly among species and ecosystems. Nutrient cycling rates of individual animals represent valuable data for testing the predictions of important frameworks such as the Metabolic Theory of Ecology (MTE) and ecological stoichiometry (ES). They...
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Mar Chiquita is the largest salt lake in South America. Because of its rich and diverse biodiversity, it has been designated a world site of the Ramsar Convention on Wetlands. Despite its importance, its limnological characteristics are poorly documented. Here we report a baseline assessment of the seasonal variations of several limnological parame...
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Don Tomás is an urban, turbid and hypereutrophic shallow lake located in the west side of Santa Rosa. As it has an important silverside population (Odontesthes bonariensis) this lake is important for recreational and touristic activities. As many changes in many limnological parameters were observed, including zooplankton composition and abundance...
Article
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Consumers in aquatic food webs can be supported by terrestrial and aquatic primary production. However, we know little about how allochthony, i.e., the proportion of consumer biomass derived from terrestrial organic matter, varies along environmental gradients. Using hydrogen isotopes (deuterium), we quantified allochthony of an ecologically domina...
Article
Prey quality can have large impacts on the survival, growth and behavior of predators. A number of studies have examined how different species of prey vary in quality. However, far less is known about intraspecific variation in the quality of prey for predators and even less about what nutrients are extracted from prey by predators. We examined how...
Article
Agricultural activities increase exports of nutrients and sediments to lakes, with multiple potential impacts on recipient ecosystems. Nutrient inputs enhance phytoplankton and upper trophic levels, and sediment inputs can shade phytoplankton, interfere with feeding of consumers, and degrade benthic habitats. Allochthonous sediments are also a pote...
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Primary production (PPr) is the energy fixed by autotrophic organisms. In aquatic ecosystems, it is mostly produced by photosynthetic processes performed by planktonic or benthic algae and macrophytes. In La Pampa, the ecology of shallow lakes has recently begun to be studied, but there is no reference made to the algal PPr and how it is influenced...
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Don Tomás is a shallow, hypereutrophic lake that received sewage inputs from the city of Santa Rosa until 1987. In 1993, the main body of water was divided into smaller adjacent ponds. One of these ponds, Canotaje pond (with a small surface area and average depth), receives an important urban runoff from the city. Thus, the high load of nutrients a...
Article
Most stoichiometric models do not consider the importance of ontogenetic changes in body nutrient composition and excretion rates. We quantified ontogenetic variation in stoichiometry and diet in gizzard shad, Dorosoma cepedianum, an omnivorous fish with a pronounced ontogenetic diet shift; and zebrafish, Danio rerio, grown in the lab with a consta...
Article
The central provinces of Argentina are characterized by the presence of a high number of shallow lakes, located in endorheic basins, many of which have elevated salinities as well as eutrophic or hypereutrophic condition. The zooplankton of four saline shallow lakes of the province of La Pampa was studied on a monthly basis during a 2-year period t...
Article
1. Vertical transport of nutrients in sedimenting faecal material is greatly reduced by coprophageous organisms. Unfortunately, nearly all work on faecal production, sedimentation and coprophagy has dealt with copepods in marine ecosystems. Here, we report the first evidence of coprophagy in freshwater zooplankton from oligotrophic and eutrophic la...
Article
Length-weight relationships for seven Boeckella species (Copepoda, Calanoida) of Argentina. In this paper we report length-weight relationships for seven Argentinean species of Boeckella using prosome length as an independent variable. The equation for each species can be used for a wide range of sizes, from copepodites to adults. Comparisons betwe...
Article
A variety of interacting physical, chemical, and biological hypotheses have been proposed to explain the formation of deep chlorophyll layers (DCL). We used an experiment to test the importance of zooplankton grazing and nutrient transport as factors maintaining the DCL. In oligotrophic Yellow Belly Lake (Sawtooth Mountains, central Idaho), which h...
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A qualitative and quantitative evaluation of the material foraged by Acromyrmex lobicornis was studied in a shrub-grassland of Lihue Calel National Park, La Pampa, Argentina. Ants foraged primarily on dicotyledons. Maximum and minimum harvest rates of green vegetation occurred in spring (39 gDM.day -1.nest -1) and summer (16 gDM.day -1.nest -1) res...
Article
Many stoichiometric models assume that animals have ontogenetically constant body nutrient composition and excretion rates, but this assumption has not been adequately tested. I quantified ontogenetic variation in stoichiometry and diet in two fish, one with (gizzard shad) and one without (zebrafish) diet shift (Chapter 2). Both species showed cons...

Questions

Question (1)
Question
Buenos dias Dr. Simal.
Podría indicarme si el uso de la segunda derivada para determinaciones de nitratos es útil para aguas salinas (NaCl)? He tenido muchas dificultades para obtener una curva de calibración en aguas salinas. Si la segunda derivada no fuera útil, qué método me aconseja para medir NO3 en este tipo de aguas?
Muchísimas gracias!
Alberto Pilati

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Project (1)
Project
Provide base information on ecology of the saline lakes in South America (particularly Argentina) and provide information and criteria for the their conservation and sustainable use