117,787 research outputs found
Centris (Wagenknechtia) moldenkei Toro & Chiappa 1989
No full textCentris (Wagenknechtia) moldenkei Toro & Chiappa, 1989 (Figures 9 −12, 31, 32 and 41) Centris moldenkei Toro & Chiappa, 1989. 15: 246, 247 (Original description). Toro et al., 1993. 18: 23, 27 (Floral record, distribution). Toro, 2002: 268, 270 (Floral record, bionomics). Montalva & Ruz, 2010. 35: 45 (List, distribution). Centris (Wagenknechtia) moldenkei; Vivallo et al., 2003: 82 (Descriptive note). Comments. Toro & Chiappa (1989) made a relatively complete description of this species, making its separation from other species of the subgenus easy. Some additional morphological characters of both sexes can be found in Vivallo et al. (2002). Diagnosis. Head and mesosoma blackish with light brown legs (Figs. 9−12). Metasoma dark brown with translucent light brown distal margins of terga and sterna (Figs. 10 and 12). Pilosity yellow, darker on legs. Female: fore and hind elaiospathes vestigial, with the combs formed by separate hairs (Figs. 31 and 32). Male: mandible long and slender, with the second tooth closer to the apical tooth than to the third tooth (Fig. 11). Type material. Holotype male (AMNH / Toro Collection, not examined). Type locality. Chile: I Tarapacá Region: La Tirana. Floral records. See table 1. Distribution. This species occurs exclusively in northern Chile, from XV Arica y Parinacota Region (Quebrada Vitor) to II Antofagasta Region (San Pedro de Atacama). CHILE: (Montalva & Ruz, 2010). II ANTOFAGASTA: San Pedro de Atacama (Vivallo et al., 2002). *Quillagua. XI ARICA Y PARINACOTA: La Tirana (Toro et al., 1993; Vivallo et al., 2002), Pica (Toro & Chiappa, 1989). *Guatacondo, *Quebrada de Tarapacá, *Quebrada Tana, *Quebrada Vítor. Material examined. CHILE: II ANTOFAGASTA: 1 male: Quillagua 10 / 1969 Montenegro, col\ Coll. Cerda/ MNHN Chile (MNHN). XV ARICA Y PARINACOTA: 1 female: Quebrada Vítor 21 / 10 / 1969 Montenegro, col\ Coll. Cerda/ MNHN Chile (MNHN). 52 males and 21 females: Tarapacá Qda. Tana 10 / 1969 \ col. L. Ruz, Chile (PUCV). 52 males and 23 females: Tarapacá Qda. Tana 10 / 1969 \ col. Montenegro, Chile (PUCV). 27 males and 16 females: Tarapacá Qda. Tana 101969 \ col. Dazarola, Chile (PUCV). 64 males and 27 females: Tarapacá, Qda. Tana 10 / 1969 \ col. Toro, Chile (PUCV). 1 female: Tarapacá Qda. Tana 10 / 1969 (PUCV). 1 male and 1 female: Tarapacá Qda. Tana 10 / 1969 /col. F. Ramírez, Chile (PUCV). 1 male: Tarapacá Qda. Tana 10 / 1969 \ col. De la Hoz, Chile (PUCV). 1 male: I Región La Tirana 29 /09/ 1983 \ B. Dyer, col. Chile \ PARATYPE (PUCV). 1 male: I Región La Tirana 29 / 09/ 1983 \ C. Massad col. Chile (PUCV). 4 females and 20 males: Guatacondo 19 /09/ 1971 Montenegro, col (PUCV). 8 males: Guatacondo 19 /09/ 1971 Pizarro, col (PUCV). 5 females and 25 males: Guatacondo 19 /09/ 1971 Toro, col (PUCV). 9 males and 2 fermales: Guatacondo 19 /09/ 1971 L. Ruz, col\ en Medicago sativa (PUCV). 1 male: Km. 1680 04/ 10 / 1997 H. Toro, col\ en Prosopis tamarugo (PUCV). 1 male: Guatacondo 19 /09/ 1971 Zúñiga, col (PUCV). 1 male: Quebrada de Tarapacá 20 / 11 / 1968 Sugaeta, col (MNHN). 1 female: Guatacondo 19 / 11 / 1971 L. Ruz, col (PUCV).Published as part of Vivallo, Felipe, 2013, Revision of the bee subgenus Centris (Wagenknechtia) Moure, 1950 (Hymenoptera: Apidae: Centridini), pp. 501-537 in Zootaxa 3683 (5) on pages 511-512, DOI: 10.11646/zootaxa.3683.5.1, http://zenodo.org/record/24841
Suplemento 46. Mente, cultura y evolución . 96 (2008) febrero. Diario de Campo. Boletín Interno de los investigadores del área de Antropología
No full text- Presentaclón por José Luis Vera Cortés. - Homo sapiens-demens: Complejidad, Evolución y Comportamiento por Xabier Lizarraga Cruchaga. - Evolución, cultura y complejidad por Florence Rosemberg Seifer. - Un primate con apetito epistémico. Pensando la evolución humana con Hume y Boltvinik por Aura L. Ponce de León. - Mente y cultura: ¡Emergencia! Por José Luis Vera Cortés. - La mente originadora de fenotipos por Pilar Chiappa. - Genes, Memes y Evolución Humana por Raíl Gutiérrez Lombardo. -Seiler, Peirce y el origen del lenguaje por Mercedes tapia Berrón
A motivation-based segmentation of Italian Airbnb users: an exploratory mixed method approach
No full textExisting studies applying a motivation-based segmentation of Airbnb users are still limited and mainly concentrated in the US; even less are studies applied in the European context. This paper applies an exploratory mixed method approach in Italy, where no study has been published around this research area so far. A qualitative study based on 26 in-depth interviews was carried out to verify if Italians are driven by the same motivations that have been identified by existing literature. Qualitative findings were then used to inform, complemented with a review of the existing literature, to design a survey instrument to collect data. Hence, a factor-cluster analysis was run to profile a sample of 247 Italians based on their motivations to use Airbnb, and a series of chi-square tests was run to investigate whether significant differences exist among clusters based on socio-demographic characteristics (gender, age, marital status, level of education, employment status, and annual income). Three clusters were identified ("Enthusiastic Airbnb lovers", "Pragmatic Airbnb users" e "Pragmatic authenticity seekers") with significant differences only based on marital status, level of education and employment status. Contributions to the body of knowledge and managerial implications are discussed and suggestions for further research are given
Can the name Mugil cephalus (Pisces: Mugilidae) be used for the species occurring in the north western Atlantic?
No full textPacheco-Almanzar, Eloísa, Simons, James, Espinosa-Pérez, Héctor, Carrara, Xavier Chiappa-, Ibáñez, Ana L. (2016): Can the name Mugil cephalus (Pisces: Mugilidae) be used for the species occurring in the north western Atlantic? Zootaxa 4109 (3): 381-390, DOI: 10.11646/zootaxa.4109.3.
Residents’ Engagement and Local Tourism Governance in Maturing Beach Destinations: Evidence from an Italian Case Study
No full textIn academia as well as in practice there is increasing interest in governing the complex relationships
within destinations. Nevertheless, a gap persists in knowledge on how to engage the local community
in the tourism development process. This paper analyzes residents’ perceptions, attitudes, and
involvement related to tourism development in a mature Italian ‘‘Sun, Sea and Sand’’ tourism
destination. Exploratory factor analysis followed by cluster analysis revealed four groups of residents
representing different levels of interest towards tourism ranging from euphoria to apathy. The findings
and conclusions are useful for tourism policymakers in Italy and elsewhere where there is a critical
need for stakeholder management and other strategic management approaches in the public real
Fairness in Machine Learning
No full textMachine learning based systems are reaching society at large and in many aspects of everyday life. This phenomenon has been accompanied by concerns about the ethical issues that may arise from the adoption of these technologies. ML fairness is a recently established area of machine learning that studies how to ensure that biases in the data and model inaccuracies do not lead to models that treat individuals unfavorably on the basis of characteristics such as e.g. race, gender, disabilities, and sexual or political orientation. In this manuscript, we discuss some of the limitations present in the current reasoning about fairness and in methods that deal with it, and describe some work done by the authors to address them. More specifically, we show how causal Bayesian networks can play an important role to reason about and deal with fairness, especially in complex unfairness scenarios. We describe how optimal transport theory can be leveraged to develop methods that impose constraints on the full shapes of distributions corresponding to different sensitive attributes, overcoming the limitation of most approaches that approximate fairness desiderata by imposing constraints on the lower order moments or other functions of those distributions. We present a unified framework that encompasses methods that can deal with different settings and fairness criteria, and that enjoys strong theoretical guarantees. We introduce an approach to learn fair representations that can generalize to unseen tasks. Finally, we describe a technique that accounts for legal restrictions about the use of sensitive attributes
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