Search results for " nest"

BIOLOGY OF THE WREN, TROGLODYTES TROGLODYTES, IN A MEDITERRANEAN INSULAR AGROECOSYSTEM

2009

In the last years many species of birds have exploited urban and suburban habitats, taking opportunistically advantage of human presence for their niche parameters. The Wren is one of them and shows a high variability in the choice of nesting sites in the gardens of the outskirts of Palermo (Sicily). For many years the authors studied the breeding habits of this small bird, and thanks to the video-tape recordings on the nests, they were able to gather new information on its feeding habits and parental care. They could establish the role played by both parents, the different prey types carried to the chicks, and other data, scarcely known in the southern part of distribution of this passerin…

Indagini sulla presenza di apoidei in aree marginali di agroecosistemi in Sicilia occidentale (Insecta Hymenoptera Apoidea)

2002

Passero Passer italiae x hispaniolensis nidificante su barca da pesca in Sicilia

2022

This short note reports the curious breeding, in terms of nest features, of several Sparrows mainly showing the phenotype of the Spanish Sparrow or Passer prope hispaniolensis, though, few males exhibited less barred flanks as for the Passer italiae. This is in agre- ement with the ambiguous taxonomy of Sparrows of Sicily that is emerged over the past 150 years. As matter of fact, the taxonomic classification of the Sicilian sparrow spans from Passer hispaniolen- sis to Passer italiae and includes hybrid species in between. Massa et al (2022) propose to name these populations Passer italiae x hispa- niolensis. Here, for the first time, the curious nesting of Passer prope hispa- niolensis on…

Geostatistical techniques for runoff mapping: an application to Sicily, Italy

2011

The availability of reliable and long time series of runoff data is fundamental for most of the hydrological analyses and for the assessment and the management of water resources even in condition of global climatic change. However, hydrologic data sets are often characterized by a short duration and also suffer from missing data values, mainly due to malfunctioning of gauging stations for a specific period. In order to overcome this problem and obtain long and continuous runoff time series, different models and methods have been previously developed and proposed. While some models, used to extent the streamflow record, are conceptual, empirical, regressive models based on the rainfall inpu…

Modeling accident risk at the road level through zero-inflated negative binomial models: A case study of multiple road networks

2021

Abstract This paper presents a case study carried out in multiple cities of the Valencian Community (Spain) to determine the effect of sociodemographic and road characteristics on traffic accident risk. The analyzes are performed at the road segment level, considering the linear network representing the road structure of each city as a spatial lattice. The number of accidents observed in each road segment from 2010 to 2019 is taken as the response variable, and a zero-inflated modeling approach is considered. Count overdispersion and spatial dependence are also accounted for. Despite the complexity and sparsity of the data, the fitted models performed considerably well, with few exceptions.…

Bayesian analysis of a Gibbs hard-core point pattern model with varying repulsion range

2014

A Bayesian solution is suggested for the modelling of spatial point patterns with inhomogeneous hard-core radius using Gaussian processes in the regularization. The key observation is that a straightforward use of the finite Gibbs hard-core process likelihood together with a log-Gaussian random field prior does not work without penalisation towards high local packing density. Instead, a nearest neighbour Gibbs process likelihood is used. This approach to hard-core inhomogeneity is an alternative to the transformation inhomogeneous hard-core modelling. The computations are based on recent Markovian approximation results for Gaussian fields. As an application, data on the nest locations of Sa…

Par svārstīgiem nestriktiem Hamahera agregācijas operatoriem daudzkritēriju lēmumu pieņemšanai

2015

Bakalaura darbs veltīts dažiem svārstīgo nestrikto Hamahera agregācijas operatoru pielietojumiem daudzkritēriju lēmumu pieņemšanas procesa modelēšanā. Darbā aplūkoti tādi nestriktās matemātikas jēdzieni, kā t-norma, t-konorma, involūcija, svārstīga nestrikta kopa, darbības ar svārstīgiem nestriktiem elementiem, kas nepieciešami, lai definētu svārstīgo nestrikto agregācijas operatoru. Izmantojot svārstīgos nestriktos Hamahera agregācijas operatorus, aprakstīts daudzkritēriju lēmumu pieņemšanas modelis, kas pielietots skaitlisku datu apstrādē. Iegūtie rezultāti analizēti.

Acorn Ants May Create and Use Two Entrances to the Nest Cavity

2021

Many ant species construct large nests that are inhabited by numerous workers, but other species dwell in ready-for-use cavities and live in small colonies. Ants of the genus Temnothorax inhabit small cavities, e.g., in acorns, twigs, and under rocks. Although a preference for nest sites with a narrower entrance is known, recent studies have shown that they also use cavities with wider entrances and may modify the size of such entrances. As good cavities for nest sites are a limited resource, the possibility to modify a potential nest site, including a reduction in the size of the hole, should be a favorable matter for the ants. Through field and laboratory experiments, I studied the acorn …

Geoestadística en regiones heterogéneas con distancia basada en el coste

2012

El germen de la presente tesis consistió en un problema aplicado, de ingeniería, al que pensamos que la Estadística como disciplina puede contribuir de manera significativa. Concretamente, se trata de la elaboración de mapas acústicos en entornos urbanos. Resuelto habitualmente de una manera determinista y aproximada, la valoración de la incertidumbre de los resultados es extremadamente deficiente en la mayoría de los casos reales. Este problema, siendo de naturaleza espacial, se puede ver como un problema de predicción geoestadística, a partir de un conjunto de observaciones de campo. La dificultad radica en que el fenómeno se sitúa en un entorno urbano, que posee una importante heterogene…

Aggregation of fuzzy structures based on equivalence relations

2016

Elektroniskā versija nesatur pielikumus