Results 81 to 90 of about 307,223 (237)

The dynamics of natural populations: feedback structures in fluctuating environments La dinámica de las poblaciones naturales: estructuras de retroalimentación en ambientes fluctuantes

open access: yesRevista Chilena de Historia Natural, 2001
The fluctuations exhibited by natural populations have fascinated ecologists for the last eighty years. However, a vigorous debate between different schools of population ecologists has hampered reaching a consensus about the causes of such numerical ...
MAURICIO LIMA
doaj  

Linajes de Trypanosoma cruzi en pacientes con enfermedad de Chagas y coinfección por VIH [PDF]

open access: yes, 2009
Introducción. Las poblaciones naturales de T. cruzi han sido clasificadas en seis linajes filogenéticos o unidades de tipificación discreta: T. cruzi I, IIa, IIb, IIc, IId y IIe, que pueden jugar un rol en el tropismo tisular y patogénesis de la ...
Altcheh, Jaime Marcelo   +11 more
core  

Risks of concealing environmental degradation

open access: yesConservation Biology, EarlyView.
Abstract Current practice seeks to conceal the visual impact of land‐use change (i.e., development). Six percent of development impact assessments in Australia and 14% of the World Bank's assessments recommend visual impact mitigation. This mitigation results in, for example, vegetated buffer strips alongside cleared agricultural areas and earthen ...
Matt W. Hayward   +8 more
wiley   +1 more source

Análisis de la variabilidad en poblaciones naturales de Solanum, secciones Lycopersicon y Basarthrum. [PDF]

open access: yes, 2015
En el Banco de Germoplasma del Instituto de Conservación y Mejora de la Agrodiversidad Valenciana de la Universidad Politécnica de Valencia (COMAV) se mantienen actualmente más de 7000 entradas de especies hortícolas, incluyendo cultivares locales españoles y especies silvestres. Entre estas entradas se incluyen 3500 de la sección Lycopersicon y 144 de
openaire   +3 more sources

Report of the Inter-American Tropical Tuna Commission for the year 1952 [PDF]

open access: yes, 1953
ENGLISH: The Inter-American Tropical Tuna Commission, established by a Convention between the United States and Costa Rica, has as its purpose the collection and interpretation of information which will facilitate maintaining, at levels of maximum ...

core  

Biología y ecología del calamar Dosidicus gigas (Cephalopoda) en aguas chilenas: una revisión [PDF]

open access: yes, 2015
Indexación: Web of Science; Scielo.ABSTRACT. The jumbo squid Dosidicus gigas is the most abundant cephalopod species in the southeastern Pacific Ocean, which supports the biggest cephalopod fishery in the world.
Ibáñez, Christian M.   +4 more
core   +3 more sources

How identity bias affects perceptions of conservation messages on social media

open access: yesConservation Biology, EarlyView.
Abstract Public support is essential for conservation, as public opinion can influence decision‐making and policy. Therefore, understanding whether bias toward conservationists due to their identity (identity bias) affects their perceived credibility and support for their recommendations is important.
Lauren F. Rudd   +4 more
wiley   +1 more source

Poblaciones de peces salvajes: ¿responsables o sufridores de las patologías virales en acuicultura? [PDF]

open access: yes, 2017
El desarrollo de la acuicultura en las últimas décadas ha sido el motor que ha favorecido el avance de la virología de peces. El número de grupos de investigación dedicados a esta disciplina ha ido incrementándose progresivamente, lo que ha implicado un ...
Pereira Dopazo, Carlos
core  

Stunting of the penis in Heleobia parchappii (Mollusca: Cochliopidae) and its relationship with parasitism [PDF]

open access: yes, 2017
Penis anatomy is used to discriminate species of gastropods belonging to the family Cochliopidae; however, this characteristic may be affected by the presence of parasites.
Etchegoin, Jorge Alejandro   +2 more
core   +2 more sources

Institutional lessons from the Nordic management model

open access: yesConservation Biology, EarlyView.
Abstract To improve wildlife management outcomes, in terms of reaching management goals and increasing legitimacy, Nordic countries have developed institutional systems involving stakeholders that aim for a more inclusive and participatory model.
Jens Nilsson   +2 more
wiley   +1 more source

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