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Trophic planktonic dynamics in a tropical estuary, Gulf of Nicoya, Pacific coast of Costa Rica during El Ni?o 1997 event
Brugnoli-Olivera,Ernesto; Morales-Ramírez,Alvaro;
Revista de biología marina y oceanografía , 2008, DOI: 10.4067/S0718-19572008000100008
Abstract: the trophic dynamics of the plankton from the gulf of nicoya, a tropical estuary in the pacific coast of costa rica, was conducted during dry and rainy seasons of 1997. water temperature, oxygen and salinity were measured at two different light penetration depths. inorganic nutrients, total and nannophytoplanktonic chlorophyll a were determined at each depth and additional samples were taken for phytoplankton taxonomic work. oblique zooplankton hauls were done and abundance, composition and dry weight of zooplankton were determined. indirect grazing rate estimate was calculated using the pigment budget. the study period coincided with an el ni?o event detected in the punta morales zone and reflected by a change in the physico-chemical water characteristics. some nutrient concentrations were correlated to the salinity, and significant differences were observed between the transition and rainy seasons in the phytoplankton biomass of the two fractions. a total of 43 phytoplankton taxa were identified and flagellates, centric and pennate diatoms represented 90% of the total phytoplankton abundance. in the zooplanktonic samples, copepods were the most abundant group and acartia lilljeborgii, pseudodiaptomus sp. and paracalanus parvus were the dominant herbivores; dry weight mean values of herbivorous copepods were between 0.6 and 50 mg m-3. grazing rate showed a mean of 0.67 ± 0.83 d-1. this study showed a seasonal behavior with changes in nutrient concentrations, availability of phytoplankton and rising temperatures through el ni?o. predation and grazing pressure produced changes in the structure of plankton (phyto and zooplankton) populations in the internal zone of gulf of nicoya
Composition of the zooplankton community,with emphasis in copepods, in Punta Morales,Golfo de Nicoya,Costa Rica
Brugnoli-Olivera,Ernesto; Díaz-Ferguson,Edgardo; Delfino-Machin,Mariana; Morales- Ramírez,Alvaro; Dominici Arosemena,Arturo;
Revista de Biología Tropical , 2004,
Abstract: the composition of the mesozooplanktonic community was studied in the punta morales estuary, gulf of nicoya,pacific coast of costa rica,during 1997.oblique plankton hauls were performed during high and low tide using a 280 μm mesh screen net equipped with a flowmeter.the community was characterized by holoplanktonic and meroplanktonic organisms.for the holoplanktonic community,the main groups were copepods (80%)and chaetognaths (16%).the most abundant species were the copepods acartia lilljeborgii and paracalanus parvus.a.lilljeborgii is a typical estuarine species that maintains high populations in estuarine systems.meroplankton was represented mainly by crustacean larvae (66%),and icthyoplankton (18%).the dominance of crustacean larvae and icthyoplankton is an evidence of the ecological importance of the punta morales zone.rev.biol.trop.52(4):897-902.epub 2005 jun 24.
Ictioplancton en la zona portuaria de Limón, Costa Rica
Arturo Dominici-Arosemena,Ernesto Brugnoli-Olivera,Sylvia Solano-Ulate,Helena Molina-Ure?a
Revista de Biología Tropical , 2000,
Abstract: Four sampling stations were set 200-500m off Limon Port, Costa Rica, at an average depth of 20 m. From October 1996 to May 1997 horizontal subsuperficial trawls were done for 12 minutes at a speed of 1.853 Km/h, with a 1 000 μm net were surveyed with. A total of 28 samples were processed and 104 physical-chemistry parameter measurements were taken. Average salinity was 30.1 + 3.7 and dissolved oxygen 6.9 + 0.6 mg l-1 reflecting good aeration throughout the sampling period. This suggests good mixture and a highly dynamic hydrography. Temperature showed no drastic variations (28.0 + 1.7 °C), possibly because of the constant mixing with shallow water. The highest larval counts were for November and early January and include families from reefs and estuaries (Balistidae, Lutjanidae) and from coastal areas (Centropomidae, Gerreidae, Haemulidae, Carangidae, Engraulidae, Hemirramphidae, and representative Pleuronectiformes) existing in a common area.
Composition of the zooplankton community,with emphasis in copepods, in Punta Morales,Golfo de Nicoya,Costa Rica
Ernesto Brugnoli-Olivera,Edgardo Díaz-Ferguson,Mariana Delfino-Machin,Alvaro Morales- Ramírez
Revista de Biología Tropical , 2004,
Abstract: The composition of the mesozooplanktonic community was studied in the Punta Morales estuary, Gulf of Nicoya,Pacific coast of Costa Rica,during 1997.Oblique plankton hauls were performed during high and low tide using a 280 μm mesh screen net equipped with a flowmeter.The community was characterized by holoplanktonic and meroplanktonic organisms.For the holoplanktonic community,the main groups were copepods (80%)and chaetognaths (16%).The most abundant species were the copepods Acartia lilljeborgii and Paracalanus parvus.A.lilljeborgii is a typical estuarine species that maintains high populations in estuarine systems.Meroplankton was represented mainly by crustacean larvae (66%),and icthyoplankton (18%).The dominance of crustacean larvae and icthyoplankton is an evidence of the ecological importance of the Punta Morales zone.Rev.Biol.Trop.52(4):897-902.Epub 2005 Jun 24. Se estudió la composición de la comunidad mezoplanctónica en Punta Morales,Golfo de Nicoya, Pacífico de Costa Rica,en 1997,arrastrando oblicuamente una red de plancton (280 μm,con flujómetro)durante marea alta y baja.La comunidad estuvo caracterizada por la presencia de organismos holo y meroplanctónicos.Los principales grupos holoplanctónicos fueron copépodos (80%)y quetognatos (16%).Las especies más abundantes fueron los copépodos Acartia lilljeborgii y Paracalanus parvus;A. lilljeborgii es una especie estuarina típica que mantiene altas poblaciones en sistemas estuarinos.El meroplancton estuvo representado principalmente por larvas de crustáceos (66%),e ictioplancton (18%).La dominancia de larvas de crustáceos e ictioplancton evidencian la importancia ecológica de la zona de Punta Morales.
Ictioplancton en la zona portuaria de Limón, Costa Rica
Dominici-Arosemena,Arturo; Brugnoli-Olivera,Ernesto; Solano-Ulate,Sylvia; Molina-Ure?a,Helena; Ramírez Coghi,Ana Rosa;
Revista de Biología Tropical , 2000,
Abstract: four sampling stations were set 200-500m off limon port, costa rica, at an average depth of 20 m. from october 1996 to may 1997 horizontal subsuperficial trawls were done for 12 minutes at a speed of 1.853 km/h, with a 1 000 μm net were surveyed with. a total of 28 samples were processed and 104 physical-chemistry parameter measurements were taken. average salinity was 30.1 + 3.7 and dissolved oxygen 6.9 + 0.6 mg l-1 reflecting good aeration throughout the sampling period. this suggests good mixture and a highly dynamic hydrography. temperature showed no drastic variations (28.0 + 1.7 °c), possibly because of the constant mixing with shallow water. the highest larval counts were for november and early january and include families from reefs and estuaries (balistidae, lutjanidae) and from coastal areas (centropomidae, gerreidae, haemulidae, carangidae, engraulidae, hemirramphidae, and representative pleuronectiformes) existing in a common area.
Forest as Capercaillie's habitat: applied research efforts and new management experiences
Brugnoli A,Brugnoli R
Forest@ , 2006,
Abstract:
Climate change and mountain Grouse: recent evidences from alpine habitats
Brugnoli A
Forest@ , 2013, DOI: 10.3832/efor0938-010
Abstract: Current climate change, referring as well to the observed rain and temperature patterns as to the increased frequency and intensity of extreme weather conditions, has a deep influence on biotic communities and, in particular, on mountain Grouse. These species show great adaptation to coldness, are highly sedentary and have quite “strict” ecological requirements, when it deals with habitat selection. Moreover, their alpine ranges are dangerously marginal to the main distribution areas, which increases the risk of dramatic changes in occurrence, demography and ecology. However, not all the species will predictably be exposed in the same way to the menace of climate change over the next 50-100 years. This article gives a brief review of the main data acquired in the alpine environment in this matter. It also underlines the utmost need to proceed with research and monitoring activities, in order to effectively adapt and manage conservation strategies on mid-long terms.
Recapture of lynx individual B132 in the Trentino province, Italy
Brugnoli A
Forest@ , 2010, DOI: 10.3832/efor0635-007
Abstract: In February 2010, B132 - a male lynx born in 2006 in north-eastern Switzerland - was recaptured in a box trap set above Molveno Lake, in Brenta Massif eastern slopes, and fit with a new GPS/GSM radiocollar by staff members of the Forest and Wildlife Service of the Autonomous Province of Trento. His 2008 dispersal into the Adamello-Brenta Natural Park area in the Trentino province was the furthest one ever documented outside of Scandinavia for a Eurasian lynx. The complete recovery of the lynx in the entire Alpine arc, after 40 years since the first reintroduction, will be a long-term task, and documentation of B132’s dispersal and spatial behaviour is of crucial interest in this respect.
Insediamento, territorio e formule notarili: una verifica (Verona, IX-XII secolo) Settlement, territory and notarial formulas: a verification (Verona, IX-XII century)
Andrea Brugnoli
Reti Medievali Rivista , 2011, DOI: 10.6092/1593-2214/310
Abstract: L’organizzazione del territorio rurale nel medioevo e la sua conoscibilità attraverso le tecniche ubicatorie utilizzate dai notai costitiscono un tema classico nella storiografia italiana della seconda metà del Novecento. La documentazione prodotta nel territorio veronese ben si presta per una verifica delle ipotesi e la formulazione di alcune linee guida per l’interpretazione delle formule notarili per quanto attiene all’insediamento e alla territorialità di villaggio. Il numero di documenti prodotti e conservati nel Veronese per i secoli IX-XII, e la loro omogeneità quanto a istituzioni che ce li hanno conservati e tramandati, permette di affrontare una complessa analisi che deve considerare diverse variabili. Sul piano documentario si tratta di possibili varietà, al limite dell’individualità, di formulari e di usi notarili; a queste si uniscono differenze geografiche, di assetti proprietari, dello sviluppo di presenze signorili e di pratiche agrarie, oltre che di popolamento che caratterizzano questo territorio. In particolare la varietà del quadro geografico, equamente suddiviso tra una fascia collinare di non disprezzabile estensione, una fascia di pianura asciutta e irrigua e una di bassa pianura soggetta a esondazioni si prospettava come un elemento positivo per identificare i diversi fattori attivi nella costruzione dell’insediamento rurale, la sua organizzazione e rappresentazione. Il presupposto di partenza è che le formule ubicatorie siano articolate in schemi frutto di una dialettica tra cultura notarile da un lato e percezione dell’organizzazione dello spazio dall’altro; quest’ultima a sua volta risultato del rapporto che si instaura tra le comunità umane e il territorio in cui le stesse vengono ad agire. L’intento è quello di evidenziare i molteplici fattori che sono stati ritenuti alla base della formazione dei territori di villaggio. è questo il livello più sfuggente e meno preso in considerazione da una storiografia italiana che ha tradizionalmente privilegiato il piano giurisdizionale (sia signorile che ecclesiastico) o fiscale e dunque il rapporto tra potere e territorio. La lettura comparata delle prassi ubicatorie come sistema di relazioni tra i termini, condotta a livello topografico sia in senso diacronico che sincronico, permette invece di evidenziarne i nessi con le diverse pratiche sul territorio: non solo le presenze fondiarie o signorili, ma anche le strutture dell’habitat, le forme di solidarietà e l’accesso alle risorse comuni. The organization of rural areas in early Middle Ages and its observability through techniques of l
Planning habitat improvement for Black Grouse in Valsugana, Trentino, Italy
Brugnoli A,Gianesini M
Forest@ , 2007,
Abstract: This technical note describes the conceiving and planning phase, the licence and EU funding procedure and the first results of a demanding habitat improvement program for Black Grouse (Tetrao tetrix), carried out in the territories of ‘Telve - Telve di sopra - Carzano’ hunting communal Reserve, in eastern Trentino. Through the years 2006-2007, activities will affect a surface of about 25.5 ha of underutilized pastures, by now invaded by shrubs and arboreal species regeneration, for a total amount of 64.250 €, whose funding will be provided thanks to the 2000-2006 Rural Development Plan by the Autonomous Province of Trento. Plan’s 9.2.3 c) provision sets in fact “activities aimed at preserving and enhancing biodiversity of an area, including what wildlife regards...” within investments eligible for public contribution. Central Valsugana Forest Association - constituted in 2005 by Telve, Carzano and Telve di sopra and other villages - thus submitted the adherence application to the Plan for the year 2005, giving a program of the investments relevant to the 9.2.3 c) provision, for a total amount of 93.300 €. Seven are the Reserve’s areas object of the established habitat improvement activities, which have already been carried out in 3 of these in the period July, 31st - October 30th 2006. Activities involved shrub mulching in shrub invaded areas: these were performed with an excavator Euromach 6500 equipped with a Seppi M. BMS-L head - and a rotor with swinging hammer - on its dipper arm. In the end, perspectives consistent with coordinating actions of habitat improvement activities and test of their actual effectiveness are described. Without doubt, in the last years the specific Rural Development Plan’s 9.2.3 c) provision has made it possible - also in other situations of the Provincial territory - to realize important habitat improvement activities devoted particularly to wildlife.
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