Results 31 to 40 of about 486 (161)
New Zealand Journal of Marine and Freshwater Research, Volume 60, Issue 1, March 2026.Aotearoa New Zealand faces accelerating loss of freshwater fish biodiversity and growing pressures on culturally significant fisheries. Technical solutions alone have failed because the challenge is not only ecological, but also institutional, cultural, and relational.
Joanne Clapcott +5 more
wiley +1 more source
Virial theorem and gravitational equilibrium with a cosmological constant
Momento, 2001 Starting from the Newtonian limit of Einstein's equations in the presence of a positive cosmological constant, we obtain a new version of the virial theorem and a condition for gravitational equilibrium. Such a condition takes the form ρ > λρvac, where ρ
Marek Nowakowski +2 more
doaj
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 +1 more
doaj +1 more source
Implementing Bayesian network models using expert elicitation for instream barrier assessment
Journal of Applied Ecology, Volume 63, Issue 2, February 2026.We have demonstrated that BN modelling and expert knowledge can be used for assessing the likelihood of fish passage where empirical data are lacking or sparse. The probabilistic framework is consistent with the need to reflect that many structures are partial barriers to fish movement and cannot be represented accurately in a binary pass/fail ...
Paul Franklin +3 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
Fishing‐Induced Regulation of Diadromous Fish Subsidies in Stream Communities
Freshwater Biology, Volume 71, Issue 1, January 2026.ABSTRACT Seasonal migrations of diadromous fish transport marine‐derived nutrients into freshwater ecosystems, enriching communities and restructuring food‐web dynamics. By diminishing these migrations, fishing pressure could disrupt cross‐ecosystem connectivity, thereby altering predator–prey interactions and community size structure.
Ben R. J. Crichton +3 more
wiley +1 more source
Perturbações cosmológicas e a taxa de crescimento das flutuações da matéria
Revista Brasileira de Ensino de FísicaAs estruturas observadas no universo (galáxias, aglomerados e superaglomerados de galáxias) são resultados da instabilidade gravitacional. Esta instabilidade amplifica perturbações, originalmente muito pequenas, até o regime não linear.
R.F. Vom Marttens +2 more
doaj +1 more source
New records of nine monogenean parasites infesting non‐native freshwater fish species in New Zealand
New Zealand Journal of Marine and Freshwater Research, Volume 59, Issue 5, Page 1052-1068, December 2025.ABSTRACT Twenty‐one non‐native freshwater fish species have established populations in New Zealand, yet only two have been reported with monogenean infestations; grass carp, Ctenopharyngodon idella (Valenciennes in Cuvier and Valenciennes, 1844) and western mosquitofish, Gambusia affinis (Baird and Girard, 1853), each with two identified monogenean ...
Ethan D. Renner, Ian C. Duggan
wiley +1 more source
Revista Chilena de Historia Natural, 2020 Galaxias maculatus is an abundant freshwater fish species in Chilean continental waters where it plays important ecological functions, yet few parasitological records of this species exist in Chile and all of them cover a very limited geographic range ...
Mario George-Nascimento +2 more
doaj +1 more source
Brazilian Archives of Biology and Technology, 2006 The present study was conducted to determine if parasite induced mortality existed in a "puyen" population in Moreno Lake, southern Argentina. Data on both parasite abundance and degree of aggregation of parasite frequency distribution showed the absence
Jorge E. Revenga +2 more
doaj +1 more source