Results 81 to 90 of about 26,040 (298)

A Modification of the Biotic Index of Organic Stream Pollution to Remedy Problems and Permit Its Use Throughout the Year [PDF]

open access: yes, 2018
The biotic index of the arthropod fauna of streams is modified by limiting to ten the number of individuals in each taxon used in its calculation. This reduces detrimental effects on the index of certain fairly tolerant taxa in clean streams, effects of ...
Hilsenhoff, William L
core   +2 more sources

Diversification and evolution of Hawaiian Megalagrion damselflies (Pinapinao, Odonata: Coenagrionidae) Ka Ho‘omāhuahua a me ke Kumu Ho‘omohala o nā Pinapinao Megalagrion o Hawai‘i (Odonata: Coenagrionidae)

open access: yesSystematic Entomology, Volume 51, Issue 1, January‐March 2026.
The ancestor of today's pinapinao, Hawaiian Megalagrion damselflies, diverged from Ischnurinae around 51 MA and likely evolved for over 20 MA before colonizing the Northwestern Hawaiian Islands. An ancestor of Megalagrion colonized the Northwestern Hawaiian Islands and diversified into ecological niches with four new breeding habitats and two new gill ...
Robert K. Hadfield   +10 more
wiley   +1 more source

Mesozoic Coleopteran Faunas fromArgentina: Geological Context, Diversity, Taphonomic Observations, and Comparison with Other Fossil Insect Records [PDF]

open access: yes, 2012
The order Coleoptera is the most diversified group of the Class Insecta and is the largest group of the Animal Kingdom. This contribution reviews the Mesozoic insects and especially the coleopteran records from Argentina, based on bibliographical and ...
Gallego, Oscar Florencio   +2 more
core   +2 more sources

The Pangean journey of ‘south forestflies’ (Insecta: Plecoptera) revealed by their first fossils

open access: yes, 2019
The ‘south forestflies’ (Notonemouridae) are known from the southern hemisphere. However, their successive closest sister-groups all occur in the northern hemisphere, suggesting a north-to-south migration at some stage of their evolution.
Yingying Cui, D. Ren, O. Béthoux
semanticscholar   +1 more source

Unraveling multipredator impacts in salmon‐bearing rivers using quantitative DNA metabarcoding

open access: yesEcological Applications, Volume 35, Issue 8, December 2025.
Abstract Ecological impacts of invasive species are mounting as their numbers and geographic extent continue to increase. Across extensive parts of their range, Pacific salmon (Oncorhynchus spp.) smolts face an expanding gauntlet of nonnative predators during their seaward migration.
John J. Winkowski   +2 more
wiley   +1 more source

Evaluación de los efectos de la urbanización en los arroyos de Tierra del Fuego [PDF]

open access: yes, 2017
We set out to understand how urbanization affects streams in Ushuaia, Tierra del Fuego. Paired ttestsand linear regressions were used to compare physico-chemical stream habitat variables (i.e., temperature,turbidity, conductivity, dissolved oxygen and pH)
Anderson, Christopher Brian   +3 more
core  

Persistence of Urban Stream Syndrome Effects from Point Source and Non-Point Source Pollutants [PDF]

open access: yes, 2017
In a previous study, Sager Creek, a small 1st-3rd order stream in northwest Arkansas was shown to be negatively impacted by urban land usage within the watershed, producing a stream that exhibited several indicators of urban stream syndrome.
Wakefield, T. S.
core   +3 more sources

Estado de conocimiento del orden Plecoptera en la Patagonia Current knowledge of Patagonian Plecoptera

open access: yesRevista de la Sociedad Entomológica Argentina, 2009
El conocimiento de Plecoptera en la Patagonia se debe en gran parte a la labor de J. Illies, llevada a cabo en las décadas del 50 y 60 del siglo pasado.
Pablo Pessacq
doaj  

Biological research of Grabia River - fifty years of activity [PDF]

open access: yes, 2005
Grabia, a small still close to natural conditions lowland river, has been an object of special interest for Łódź hydrobiologists for more than 50 years.
Siciński, Jacek, Tończyk, Grzegorz
core  

Distribution and ecology of the stoneflies (Plecoptera) of Flanders (Belgium) [PDF]

open access: yes, 2008
Based on a literature survey and the identification of all available collection material from Flanders, a checklist is presented, distribution maps are plotted and the relationship between the occurrence of the different species and water characteristics
Goethals, Peter, Lock, Koen
core   +1 more source

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