Results 51 to 60 of about 660,321 (207)

Análisis comparativo de las mediciones de material particulado PM10

Revista Facultad de Ingeniería Universidad de Antioquia, 2011
En este estudio se determinaron las concentraciones de PM10 en la zona urbana del municipio de Riohacha, Colombia y se compararon dos métodos de muestreo de manera simultánea.
Roberto Rojano Alvarado, Jhonny Pérez Montiel, Jorge Deluque   +2 more
doaj  

Nocturnal Gardeners: Dispersal of Large Seeds by Tent‐Roosting Bats in the Lacandon Rainforest, Mexico

Biotropica, Volume 58, Issue 2, March 2026.
Tent‐roosting bats in the Lacandon Forest, Mexico, play a previously undocumented role in dispersing large seeds (> 5 mm) from mature forest species with important ecological and human uses. Sampling 21 feeding tents across two protected areas yielded 2137 seeds from 54 species, with seed deposition rates significantly higher under bat tents than in ...
Francisco Perera Rieder, Marina Rivero, Rodrigo A. Medellín   +2 more
wiley   +1 more source

Length-frequency estimation for yellowfin tuna (Thunnus albacares) caught by commercial fishing gear in the Eastern Pacific Ocean [PDF]

, 1992
ENGLISH: Methods of collecting samples for the purpose of estimating the numbers and weights of fish caught, by length interval, are described. Several models for two-stage sampling are described, and the equations for the estimators and their variances ...
Calkins, Thomas P., Tomlinson, Patrick K., Tsuji, Sachiko   +2 more
core  

Beyond species means – the intraspecific contribution to global wood density variation

New Phytologist, Volume 249, Issue 6, Page 2630-2651, March 2026.
Summary Wood density is central for estimating vegetation carbon storage and a plant functional trait of great ecological and evolutionary importance. However, the global extent of wood density variation is unclear, especially at the intraspecific level. We assembled the most comprehensive wood density collection to date, including 109 626 records from
Fabian Jörg Fischer, Jérôme Chave, Amy Zanne, Tommaso Jucker, Alex Fajardo, Adeline Fayolle, Renato Augusto Ferreira de Lima, Ghislain Vieilledent, Hans Beeckman, Wannes Hubau, Tom De Mil, Daniel Wallenus, Ana María Aldana, Esteban Alvarez‐Dávila, Luciana F. Alves, Deborah M. G. Apgaua, Fátima Arcanjo, Jean‐François Bastin, Andrii Bilous, Philippe Birnbaum, Volodymyr Blyshchyk, Joli Borah, Vanessa Boukili, J. Julio Camarero, Luisa Casas, Roberto Cazzolla Gatti, Jeffrey Q. Chambers, Ezequiel Chimbioputo Fabiano, Brendan Choat, Georgina Conti, Will Cornwell, Javid Ahmad Dar, Ashesh Kumar Das, Magnus Dobler, Dao Dougabka, David P. Edwards, Robert Evans, Daniel Falster, Philip Fearnside, Olivier Flores, Nikolaos Fyllas, Jean Gérard, Rosa C. Goodman, Daniel Guibal, L. Francisco Henao‐Diaz, Vincent Hervé, Peter Hietz, Jürgen Homeier, Thomas Ibanez, Jugo Ilic, Steven Jansen, Rinku Moni Kalita, Tanaka Kenzo, Liana Kindermann, Subashree Kothandaraman, Martyna Kotowska, Yasuhiro Kubota, Patrick Langbour, James Lawson, André Luiz Alves de Lima, Roman Mathias Link, Anja Linstädter, Rosana López, Cate Macinnis‐Ng, Luiz Fernando S. Magnago, Adam R. Martin, Ashley M. Matheny, James K. McCarthy, Regis B. Miller, Arun Jyoti Nath, Bruce Walker Nelson, Marco Njana, Euler Melo Nogueira, Alexandre Oliveira, Rafael Oliveira, Mark Olson, Yusuke Onoda, Keryn Paul, Daniel Piotto, Phil Radtke, Onja Razafindratsima, Tahiana Ramananantoandro, Jennifer Read, Sarah Richardson, Enrique G. de la Riva, Oris Rodríguez‐Reyes, Samir G. Rolim, Victor Rolo, Julieta A. Rosell, Roberto Salguero‐Gómez, Nadia S. Santini, Bernhard Schuldt, Luitgard Schwendenmann, Arne Sellin, Timothy Staples, Pablo R. Stevenson, Somaiah Sundarapandian, Masha T. van der Sande, Bernard Thibaut, David Yue Phin Tng, José Marcelo Domingues Torezan, Boris Villanueva, Aaron Weiskittel, Jessie Wells, S. Joseph Wright, Kasia Zieminska   +105 more
wiley   +1 more source

Potencialidades de Google Maps en la investigación social aplicada

Arxius de Ciències Socials
En los últimos años, Google ha dedicado recursos para construir un mapa completo del mundo. Escanean constantemente el territorio, recopilando una gran cantidad de datos que proporcionan una información geográfica actualizada y completa.
Yaiza Pérez Alonso, Eric Gielen, Raquel Pérez, Jèssica Pérez   +3 more
doaj   +1 more source

¿Cómo mejorar el muestreo en estudios de porte medio usando diseños con métodos mixtos? Aportes desde el campo de estudio de elites

EMPIRIA: Revista de Metodología de Ciencias Sociales, 2019
El objetivo del trabajo es abordar algunas problemáticas recurrentes y alternativas para el diseño muestral de poblaciones de porte medio en el campo de estudio de elites.
Miguel Serna
doaj   +1 more source

Razonamiento estadístico en situaciones de muestreo y simulación [PDF]

, 2012
Este taller propone una trayectoria de enseñanza que busca promover el razonamiento estadístico, de estudiantes universitarios, alrededor de situaciones de muestreo apoyadas en actividades de simulación. La postura conceptual y metodológica se fundamenta
Arboleda, Luis Carlos, Fernández, Felipe, Urbina, Germán   +2 more
core  

Long‐term comparison shows protected and non‐protected forests differ in harvesting, but not in wildfires or drought‐driven dieback

Journal of Applied Ecology, Volume 63, Issue 2, February 2026.
Lower forest harvesting in Natura 2000 sites may align with socio‐economic barriers often claimed by local communities, but protection does not influence vulnerability to other disturbances. In a general scenario of reduced forest harvesting in the region, we argue that differences in harvesting due to protection are statistically significant but ...
Josep Maria Espelta, Alba Viana‐Soto, Roberto Molowny‐Horas, Miquel de Caceres, Miriam Selwyn, Mireia Banqué, Lluís Brotons, Francisco Lloret, Jordi Martínez‐Vilalta, Miriam Piqué, Cornelius Senf   +10 more
wiley   +1 more source

Diversity and composition of understory vegetation in the tropical seasonal rain forest of Xishuangbanna, SW China

Revista de Biología Tropical, 2011
Tropical forests vegetation and community research have tended to focus on the tree component, and limited attention has been paid to understory vegetation.
Lü Xiao-Tao, Yin Jiang-Xia, Tang Jian-Wei   +2 more
doaj  

Muestreo de "Dryomia lichtensteini" (F. Lw.) (Diptera: Cecidomyiidae) en alcornoque [PDF]

, 2002
Para valorar las poblaciones insectos es preciso el desarrollo de un método de muestreo que tenga una precisión suficiente y permita, a la vez, su aplicación práctica en el campo.
Jiménez, Antonio, Ocete Rubio, María Elvira, Soria Iglesias, Francisco Javier, Villagrán Pinteño, Miguel   +3 more
core