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Temporal variation on the diet of the South American Tern (Sterna hirundinacea, Charadriiformes: Laridae) on its wintering grounds
ALFARO,MATILDE; MAUCO,LAURA; NORBIS,WALTER; LIMA,MAURICIO;
Revista chilena de historia natural , 2011, DOI: 10.4067/S0716-078X2011000300011
Abstract: the diet of the south american tern (sterna hirundinacea) and its seasonal variation during the 2005 and 2006 non-reproductive seasons in the uruguayan atlantic coast was analyzed. diet was assessed by the analysis of pellets collected in the rocha lagoon sandbar, a major tern roosting area in uruguay, aiming to analyze the hypothesis that terns feed mainly on the argentine anchovy (engraulis anchoita) during the wintering period. a total of 844 pellets were collected, 442 in 2005 and 402 in 2006. diet was composed of fish (88 %), insects (9 %) and crustaceans (3 %). the main fish species consumed was the argentine anchovy (77.7 %), followed by marini's anchovy (anchoa marinii) (7.9 %) and the striped weakfish (cynoscion guatucupa) (3.6 %). insects and crustaceans were the main items in two of the groups of pellets collected during the study period. despite this temporal variation in the diet, the argentine anchovy was the main prey item consumed during both seasons. these results support the hypothesis that south american terns strongly depend on anchovies as trophic resource.
Temporal variation on the diet of the South American Tern (Sterna hirundinacea, Charadriiformes: Laridae) on its wintering grounds Variación temporal en la dieta del Gaviotín Sudamericano (Sterna hirundinacea, Charadriiformes: Laridae) en los sitios de invernada
MATILDE ALFARO,LAURA MAUCO,WALTER NORBIS,MAURICIO LIMA
Revista chilena de historia natural , 2011,
Abstract: The diet of the South American Tern (Sterna hirundinacea) and its seasonal variation during the 2005 and 2006 non-reproductive seasons in the Uruguayan Atlantic coast was analyzed. Diet was assessed by the analysis of pellets collected in the Rocha lagoon sandbar, a major tern roosting area in Uruguay, aiming to analyze the hypothesis that terns feed mainly on the Argentine Anchovy (Engraulis anchoita) during the wintering period. A total of 844 pellets were collected, 442 in 2005 and 402 in 2006. Diet was composed of fish (88 %), insects (9 %) and crustaceans (3 %). The main fish species consumed was the Argentine Anchovy (77.7 %), followed by Marini's Anchovy (Anchoa marinii) (7.9 %) and the Striped Weakfish (Cynoscion guatucupa) (3.6 %). Insects and crustaceans were the main items in two of the groups of pellets collected during the study period. Despite this temporal variation in the diet, the Argentine Anchovy was the main prey item consumed during both seasons. These results support the hypothesis that South American Terns strongly depend on anchovies as trophic resource. En este trabajo se analizó la dieta del Gaviotín Sudamericano (Sterna hirundinacea) y su variación estacional durante las temporadas no reproductivas de 2005 y 2006 en la costa atlántica uruguaya. La dieta fue estudiada por medio del análisis de bolos colectados en la barra de la laguna de Rocha, una importante zona de descanso para la especie en Uruguay, con el propósito de analizar la hipótesis de que el gaviotín se alimenta principalmente de Anchoíta Argentina (Engraulis anchoita) durante el período de invernada. Un total de 844 bolos fueron colectados, 442 en 2005 y 402 en 2006. La dieta estuvo compuesta por peces (88 %), insectos (9 %) y crustáceos (3 %). La principal presa consumida fue la Anchoíta Argentina (77.7 %), seguida de la Anchoa (Anchoa marinii) (7.9 %) y la Pescadilla de Red (Cynoscion guatucupa) (3.6 %). Los insectos y los crustáceos fueron el ítem principal en dos de las muestras (grupos de bolos) colectadas durante el período de estudio. A pesar de esta variación temporal en la dieta la Anchoíta Argentina fue la presa principal durante las dos temporadas de estudio. Este resultado apoya la hipótesis planteada de que la anchoíta es el principal recurso alimenticio del Gaviotín Sudamericano.
Primer registro de reproducción de la Gaviota Cocinera (Larus dominicanus) en la Bahía Samborombón, provincia de Buenos Aires, Argentina
Mauco,Laura; Paterlini,Carla; Isaldo,Diego I.; Quintero Blanco,Sergio A.; Navarro,Maximiliano;
El hornero , 2007,
Abstract: we describe a new kelp gull (larus dominicanus) colony, the most northern one along the argentine atlantic coast, located near punta rasa reserve, samborombón bay. the colony was found on one of several island of the san clemente's tidal creek located near san clemente del tuyú harbour. the first visit to the colony was made during courtship and nest formation in 3 september 2005. the second visit was made during the egg laying period between 24-26 september 2005. a total of 54 nests were found, 50 of them upon pickle weed, 2 upon dense-flowered pampas grass and 2 in the mud near a burrowing crab area. on 15 december 2005 we counted a total of 64 chicks in 54 nests. although this is the first record of kelp gull reproduction in the area, local fishermen recall this colony being there since at least 20 years ago. its location near san clemente harbour suggests that human presence may be frequent and that egg collection could occur frequently.
Gender difference and sex hormone production in rodent renal ischemia reperfusion injury and repair
René Robert, Daniel Ghazali, Frédéric Favreau, Gérard Mauco, Thierry Hauet, Jean-Michel Goujon
Journal of Inflammation , 2011, DOI: 10.1186/1476-9255-8-14
Abstract: Age-matched sexually mature male and female rats were subjected to 60 min of renal unilateral ischemia by pedicle clamping with contralateral nephrectomy and followed for 1 or 5 days after reperfusion. Plasma creatinine, systemic testosterone, progesterone and estradiol levels were determined. Tubular injury, cell proliferation and inflammation, were evaluated as well as proliferating cell nuclear antigen, vimentin and translocator protein (TSPO) expressions by immunohistochemistry.After 1 and 5 days of reperfusion, plasma creatinine was significantly higher in males than in females, supporting the high mortality in this group. After reperfusion, plasma testosterone levels decreased whereas estradiol significantly increased in male rats. Alterations of renal function, associated with tubular injury and inflammation persisted during the 5 days post-ischemia-reperfusion, and a significant improvement was observed in females at 5 days of reperfusion. Proliferating cell nuclear antigen and vimentin expression were upregulated in kidneys from males and attenuated in females, in parallel to injury development. TSPO expression was transiently increased in proximal tubules in male rats.After ischemia, renal function recovery and tissue injury is gender-dependent. These differences are associated with a modulation of sex hormone production and a modification of tissue remodeling and proliferative cell processes.Several lines of evidence suggest that both humoral and cell-mediated immunity are more active in females than in males [1]. Sex steroid hormones could play a pivotal role [2,3] in this process, and act as regulators of inflammatory processes. Indeed, numerous inflammatory cell functions, such as neutrophil chemoattractant generation, phagocytic responses of neutrophils [4], and nitric oxide production by alveolar macrophages [5] show gender differences.Ischemia-reperfusion injury (IRI) is known to exacerbate a pro-inflammatory milieu. The influence of gender on IRI h
Ecología y conservación de aves marinas que utilizan el litoral bonaerense como área de invernada
Silva Rodríguez,María Patricia; Favero,Marco; Berón,María Paula; Mariano-Jelicich,Rocío; Mauco,Laura;
El hornero , 2005,
Abstract: the coasts of buenos aires province, argentina, are used by a large number of seabird and shorebird species as breeding, refueling, and wintering sites. many of these species use both marine and estuarine resources, being the later more stable in space and time and more likely to act as buffers of unpredictable marine resources. in this study we present current and historical information about the diet spectrum and ecology of the species studied during the last decade in eastern and south-eastern buenos aires province. among the birds studied we provide information on four gull species, three terns and a skimmer, as well as the neotropic cormorant, grebes and coots. all the species can be characterized by a diet spectrum with an important presence of fish, crustaceans and insects. generally, close relative species show trophic segregation given by differences in the use of foraging areas, prey sizes and even foraging behavior and daytime activity. even when buenos aires province has many protected areas recognized at local, regional and international levels, habitat degradation is one of the most important conservation issues affecting the coasts and its bird populations.
The number fraction of discs around brown dwarfs in Orion OB1a and the 25 Orionis group
Juan José Downes,Carlos Román-Zú?iga,Javier Ballesteros-Paredes,Cecilia Mateu,César Brice?o,Jesús Hernández,Monika G. Petr-Gotzens,Nuria Calvet,Lee Hartmann,Karina Mauco
Physics , 2015,
Abstract: We present a study of 15 new brown dwarfs belonging to the $\sim7$ Myr old 25 Orionis group and Orion OB1a sub-association with spectral types between M6 and M9 and estimated masses between $\sim0.07$M$_\odot$ and $\sim0.01$ M$_\odot$. By comparing them through a Bayesian method with low mass stars ($0.8\lesssim$ M/M$_\odot\lesssim0.1$) from previous works in the 25 Orionis group, we found statistically significant differences in the number fraction of classical T Tauri stars, weak T Tauri stars, class II, evolved discs and purely photospheric emitters at both sides of the sub-stellar mass limit. Particularly we found a fraction of $3.9^{+2.4}_{-1.6}~\%$ low mass stars classified as CTTS and class II or evolved discs, against a fraction of $33.3^{+10.8}_{-9.8}~\%$ in the sub-stellar mass domain. Our results support the suggested scenario in which the dissipation of discs is less efficient for decreasing mass of the central object.
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