Results 11 to 20 of about 2,518 (149)
Conservation threats and future prospects for the freshwater fishes of Ecuador: A hotspot of Neotropical fish diversity. [PDF]
J Fish Biol, 2021 ABSTRACT Freshwater fish communities in Ecuador exhibit some of the highest levels of diversity and endemism in the Neotropics. Unfortunately, aquatic ecosystems in the country are under serious threat and conditions are deteriorating. In 2018–19, the government of Ecuador sponsored a series of workshops to examine the conservation status of Ecuador's ...
Aguirre WE +15 more
europepmc +2 more sources
Divergent evolution of male aggressive behaviour: another reproductive isolation barrier in extremophile poeciliid fishes? [PDF]
Int J Evol Biol, 2012 Reproductive isolation among locally adapted populations may arise when immigrants from foreign habitats are selected against via natural or (inter‐)sexual selection (female mate choice). We asked whether also intrasexual selection through male‐male competition could promote reproductive isolation among populations of poeciliid fishes that are locally ...
Bierbach D +6 more
europepmc +2 more sources
Gradient evolution of body colouration in surface- and cave-dwelling Poecilia mexicana and the role of phenotype-assortative female mate choice. [PDF]
Biomed Res Int, 2013 Ecological speciation assumes reproductive isolation to be the product of ecologically based divergent selection. Beside natural selection, sexual selection via phenotype‐assortative mating is thought to promote reproductive isolation. Using the neotropical fish Poecilia mexicana from a system that has been described to undergo incipient ecological ...
Bierbach D +16 more
europepmc +2 more sources
Medicinal Plants from North and Central America and the Caribbean Considered Toxic for Humans: The Other Side of the Coin. [PDF]
Evid Based Complement Alternat Med, 2017 The consumption of medicinal plants has notably increased over the past two decades. People consider herbal products as safe because of their natural origin, without taking into consideration whether these plants contain a toxic principle. This represents a serious health problem.
Alonso-Castro AJ +7 more
europepmc +2 more sources
Potential of Traditional Knowledge of Plants in the Management of Arthropods in Livestock Industry with Focus on (Acari) Ticks. [PDF]
Evid Based Complement Alternat Med, 2017 Antitick plants and related ethnoknowledge/ethnopractices with potential for integrated tick control and management strategies to improve livestock production are reviewed. About 231 plants reviewed showed a variety of bioactive properties, namely, being toxic, repellent, antifeedant, and antiovipositant and ability to immobilize target tick species ...
Wanzala W.
europepmc +2 more sources
Long‐term ecological legacies in western Amazonia
Journal of Ecology, Volume 109, Issue 1, Page 432-446, January 2021., 2021 We documented successional dynamics in a lowland Amazonian forest setting for hundreds of years following the cessation of pre‐Columbian disturbance. We found no evidence of persistent enrichment or depletion of intentionally altered taxa (i.e. direct legacy effects) but did find evidence of indirect legacy effects that have persisted to the modern day.
Christine M. Åkesson +9 more
wiley +1 more source
Carl Djerassi: “In memoriam”. Pionero de la creación del “anticonceptivo oral” y hombre polifacético
Perinatología y Reproducción Humana, 2015 Carl Djerassi nació en Viena en 1923 y emigró a New York en 1939 donde escribió una carta a Eleanor Roosevelt solicitando un apoyo para continuar sus estudios, graduándose en química en 1942 y obteniendo su doctorado en química en la Universidad de ...
A. Zárate +3 more
doaj +1 more source
Folia Amazónica, 2014 El presente estudio tuvo como objetivo determinar el control in vitro e in vivo de garrapatas (Rhipicephalus (Boophilus) microplus) utilizando la raíz pulverizada del barbasco (Lonchocarpus nicou (Aublet) DC.). La raíz fresca se trozó, deshidrató a 50°C y se trituró en un molino Willy hasta 1 mm de partícula.
MEJÍA-AGUIRRE, Yemen +1 more
openaire +5 more sources
Pro Sciences: Revista de Producción, Ciencias e Investigación, 2019 La presente investigación tuvo como objetivo, evaluar el bioplaguicida de origen botánico en el control del caracol (Pomácea canaliculata) en el cultivo del arroz (Oryza sativa) en el cantón Naranjal, provincia del Guayas, se determinó la dosis de rotenona que mejor controló la presencia del caracol y se realizó económicamente la dosis de los ...
Fajardo Vélez, Adriana Elizabeth +5 more
openaire +3 more sources
O timbó: expansão, declínio e novas possibilidades para agricultura orgânica. [PDF]
, 2012 bitstream/item/63606/1/Oriental-Doc195 ...
HOMMA, A. K. O.
core