Results 21 to 30 of about 242 (137)

Unravelling β‐Diversity and the Role of Small Streams in Shaping Fish Communities Using a National‐Scale eDNA Database

New Zealand Journal of Marine and Freshwater Research, Volume 60, Issue 3, September 2026.
The role of river size on fish communities remains underexplored in freshwater ecology. Small streams, despite accounting for 75% of stream length, are more vulnerable to human impacts and often lack legislative protection. Nevertheless, they can serve as refuges and rearing areas for fish, including rare or threatened species.
Lovisa Genevieve Ekelund, N. C. Boddy, J. Brasington, R. G. Death, I. Barrett   +4 more
wiley   +1 more source

Além das galáxias brilhantes: a descoberta da matéria escura e o papel de Vera Rubin [PDF]

Revista Brasileira de Ensino de Física
Desde a década de 1930 os cientistas enfrentavam dificuldades para calcular a massa de aglomerados de galáxias a partir da luminosidade, pois os efeitos gravitacionais observados não correspondiam à soma das massas visíveis.
Julia Medeiros, Gabriela Kaiana Ferreira
doaj   +1 more source

Galaxia vocálica

Matlit Revista do Programa de Doutoramento em Materialidades da Literatura, 2017
Galaxia vocálica (00:05:27) es una posible interpretación sonora del texto de Pedro Xisto “VOGALAXIA” (Ed. Invenção / San Paulo – 1966) en el que las vocales (elemento de trabajo) están relacionadas entre sí. La oralización de la obra, sigue las sugerencias  del autor, las vocales suenan abiertas o cerradas, nasales, acentuadas, susurradas, aceleradas,
openaire   +2 more sources

Landscape and Hydro‐Climatic Drivers of Fish Communities in Floodplain Wetlands

Freshwater Biology, Volume 71, Issue 8, August 2026.
ABSTRACT Floodplain wetlands are characterised by dynamic hydrological regimes and seasonal patterns of wetting and drying. They support distinct communities of fish, many of which are adapted to dynamic and variable conditions. Seasonal hydrological variation and the degree of water permanence influence physicochemical conditions and local habitat ...
Saúl González‐Murcia, Samuel Lewis, Sally Maxwell, Luke McPhan, Michael Shackleton, Nick Bond   +5 more
wiley   +1 more source

Spawning of threatened barred galaxias, 'Galaxias fuscus' (Teleostei: Galaxiidae)

, 2019
(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
Stoessel, Daniel J, Raadik, Tarmo A, Ayres, Renae M.   +2 more
openaire   +1 more source

Catch Me If You Can: Assessing Sampling Techniques for Threatened Floodplain Wetland Fish

Aquatic Conservation: Marine and Freshwater Ecosystems, Volume 36, Issue 7, July 2026.
ABSTRACT Floodplain wetlands are declining globally in extent and ecological condition. Changing climates, increasing agricultural activity and invasive species are among the key threats contributing to biodiversity loss, with native fish species increasingly in decline and listed as threatened or endangered. Floodplain wetlands present unique sampling
Samuel Lewis, Sally Maxwell, Michael Shackleton, Meaghan L. Rourke, Saúl Gonzalez Murcia, Caitlin Gionfriddo, David Wheeler, Akitomo Kawasaki, Deirdre Hanrahan‐Tan, Dale G. McNeil, Nick R. Bond   +10 more
wiley   +1 more source

Environmental DNA as a Detection and Quantitative Tool for Brown Bullhead Catfish (Ameiurus nebulosus): A Comparison With Conventional Netting

Environmental DNA, Volume 8, Issue 4, July‐August 2026.
Multiple environmental DNA (eDNA) methods were compared with each other and with fyke netting for detecting invasive brown bullhead catfish. eDNA sampling combined with catfish‐specific metabarcoding provides sensitive detection and effectively complements traditional netting for biosecurity.
Nicola Rose Pyper, Shaun Wilkinson, Angela McGaughran   +2 more
wiley   +1 more source

Rayos cósmicos ultra-energéticos y lentes magnéticas

Momento, 2000
I discuss the effects associated to the defiection of ultra- high energy cosmic rays by galactic magnetic fields. These are of particular interest for the study and localization of extragalactic sources, which is one of the primary objectives of the ...
Esteban Roulet
doaj  

Impacts of climate change on temperature and dissolved oxygen in an oligotrophic deep lake

Limnology and Oceanography, Volume 71, Issue 7, July 2026.
Abstract Climate change has significant effects on freshwater ecosystems, including lakes, influencing key water quality indicators such as water temperature and dissolved oxygen concentrations (DO). This study uses a 3D hydrodynamic model (AEM3D) coupled with a simple biogeochemical module (iWQ) alongside observations to examine historical changes in ...
Aidin Jabbari, Piet Verburg, David Plew, Simon D. Stewart, Mat Allan, Christian Zammit   +5 more
wiley   +1 more source

Matéria Escura no Ensino Médio

Revista Brasileira de Ensino de Física, 2023
Apresentamos uma abordagem do conceito de matéria escura, desenvolvida visando o ensino médio. Evidências da existência de matéria escura são estudadas a partir das curvas de rotação de galáxias, utilizando apenas elementos presentes na grade curricular ...
Samuel Jorge Carvalho Ximenes, Carlos Eduardo Aguiar   +1 more
doaj   +1 more source