Results 71 to 80 of about 16,183 (209)

Morphological and hematological studies of Trypanosoma spp. infecting ornamental armored catfish from Guamá River-PA, Brazil

open access: yesAnais da Academia Brasileira de Ciências, 2013
A total of 281 specimens of freshwater armored ornamental fish species (Leporacanthicus galaxias, Lasiancistrus saetiger, Cochliodon sp., Hypostomus sp., Pseudacanthicus spinosus, Ancistrus sp. and Rineloricaria cf.
Rodrigo Y. Fujimoto   +7 more
doaj   +1 more source

Phenotypically Induced Intraspecific Variation in the Morphological Development of Wetland and Stream Galaxias gollumoides McDowall and Chadderton

open access: yesDiversity, 2020
The hypothesis that contrasting hydrology induces divergent intraspecific phenotypic plastic responses in non-migratory freshwater fish was investigated. Morphologies of wetland and stream Galaxias gollumoides from South Island, New Zealand, at different
Nicholas R. Dunn   +2 more
doaj   +1 more source

Distribution of freshwater fish in the south-western corner of Australia [PDF]

open access: yes, 1996
This study investigates the distribution of freshwater fishes in the Busselton to Walpole Region. A total of 311 sites in 19 major catchments along the south-west coast from Capel to Walpole, were sampled using a variety of methods.
Gill, H.S., Morgan, D.L., Potter, I.C.
core   +1 more source

Buracos Negros: sementes ou cemitérios de galáxias?

open access: yesCaderno Brasileiro de Ensino de Física, 2010
É apresentada uma breve história da ideia de buraco negro, desde a formulação da Teoria da Relatividade Geral até observações recentes. Durante o século XX, a ideia passou de mera especulação teórica até exercer um papel central para explicar os objetos
João E. Steiner
doaj   +1 more source

Historical Impacts of Invasive Species May Not Always Be What They Seem: A Genetic Perspective From an Endangered Native Species

open access: yesDiversity and Distributions, Volume 31, Issue 11, November 2025.
ABSTRACT Aim Invasive species can affect native species detrimentally, causing localised population declines, range contractions and extinctions. Given the costs and difficulties of controlling invasive species, sound knowledge of the potential benefits to native species is essential.
Charlotte Jense   +3 more
wiley   +1 more source

La Evolución de la Forma y Estructura de las Galaxias: ¿Cómo eran hace 6 mil millones de años?

open access: yesPrisma Tecnológico, 2010
Las galaxias son objetos complejos que contienen algunas decenas de billones de estrellas y puede ser clasificadas por su forma y estructura siguiendo al secuencia de Hubble.
Rodney Delgado
doaj  

A matéria escura no universo - uma sequência didática para o ensino médio

open access: yesRevista Brasileira de Ensino de Física
Nós apresentamos uma proposta pedagógica para introduzir o tema da matéria escura no universo para alunos do ensino médio. O apelo intrínseco deste tema é usado para discutir aplicações de movimento de sistemas planetários e estrelas em galáxias e as ...
Thiago de C. Gusmão   +2 more
doaj   +1 more source

Overlooked and underestimated: reframing restoration to include inconspicuous native invaders

open access: yesRestoration Ecology, Volume 33, Issue 8, November 2025.
Anthropogenic changes cause some native species to increase in abundance or distribution. These hyperabundant natives, native invaders, follow the same ecological ‘rules’ as exotic invasives and can have comparable impacts. However, their management is a relatively new challenge in restoration ecology, with most frameworks operating within a native ...
Saskia K. Brown   +3 more
wiley   +1 more source

Ecological and physical characteristics of the Te Awa O Katapaki Stream, Flagstaff, Waikato [PDF]

open access: yes, 2001
1. The fish, macroinvertebrates, aquatic vegetation, and water quality indicate that the Te Awa O Katapaki Stream is an unpolluted, pastureland stream that is typical of the Waikato region. 2.
Hicks, Brendan J.   +3 more
core   +1 more source

Retorno à praia de Itaipu ou ao Monte Meru

open access: yesEnsaios de Geografia, 2021
Poema que utiliza termos e conceitos de uso em antropologia ("Monte Meru", centro do mundo) geografia (crosta oceânica de basalto), astronomia (aglomerados de galáxias, matéria escura), buscando estabelecer uma comunicação, ainda que velada pelos signos ...
Sammis Reachers Critence Silva
doaj  

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