Abstract Primary biodiversity data constitute observations of particular species at given points in time and space. Open‐access electronic databases provide unprecedented access to these data, but their usefulness characterizing distributions patterns depend on how complete inventories are a survey location uniformly distributed locations along dimensions time, space, environment. Our aim was compare completeness coverage among three open‐access representing ten taxonomic groups (amphibians,...

ABSTRACT Understanding which species can persist in human‐modified environments is essential to biodiversity conservation the Anthropocene. In urbanised environments, many stressors limit persistence of imperilled native via impacts on abiotic and biotic environment. Habitat restoration followed by reintroduction may be an effective strategy maintain or even regenerate but few studies have assessed these two strategies concomitantly urban freshwater ecosystems. We short‐term population...

Cities are concentrations of sociopolitical power and prime architects land transformation, while also serving as consumption hubs "hard" water energy infrastructures. These infrastructures extend well outside metropolitan boundaries impact distal river ecosystems. We used a comprehensive model to quantify the roles anthropogenic stressors on hydrologic alteration biodiversity in US streams isolate impacts stemming from hard infrastructure developments cities. Across contiguous United...

Abstract Aim Open‐access databases provide unprecedented access to records of species occurrence, but their utility depends on how complete inventories are at given surveying resolutions and uniformly distributed surveys in space time. Our aims were assess (1) the completeness freshwater fish across spatial scales among habitats (2) survey coverage along temporal gradients. Location Contiguous United States. Methods We compiled occurrence from Global Biodiversity Information Facility,...

Emissions of CO2 and CH4 from freshwater reservoirs constitute a globally significant source atmospheric greenhouse gases (GHGs), but knowledge gaps remain with regard to spatiotemporal drivers emissions. We document the spatial seasonal variation in surface diffusion Douglas Lake, hydropower reservoir Tennessee, USA. Monthly estimates across 13 sites January November 2010 indicated that diffusions ranged 236 18,806 mg·m−2·day−1 for 0 0.95 CH4. Next, we developed statistical models using...

Describing the physical habitat diversity of stream types is important for understanding ecosystem complexity, but also prioritizing management ecosystems, especially those that are rare. We developed a classification system six layers (size, gradient, hydrology, temperature, valley confinement, and substrate) approximately 1 million reaches within Eastern United States in order to conduct an inventory different streams examine diversity. Additionally, we compare patterns anthropogenic...

Abstract Stream fish distributions are commonly linked to environmental disturbances affecting terrestrial landscapes. In Great Plains prairie streams, the independent and interactive effects of watershed impoundments land cover changes remain poorly understood despite their prevalence assumed contribution declining stream diversity. We used structural equation models community samples from third‐order streams in Kansas River Arkansas basins Kansas, USA test simultaneous geographic location,...

Environmental niche modeling is a valuable tool but it often fails to identify causal links between environmental gradients and individual‐ or population‐level performance that drive species' distributions. Correlation the abundances of stream fish species longitudinal position in networks well documented hypothesized occur through differential filtering trophic traits. Still, trophically similar congeners exhibit complementary distributions along size gradients, suggesting other mechanisms...

Abstract Aim Present a hybrid biogeographic and environmentally constrained clustering approach to classify ~853,000 stream reaches in the eastern United States. Examine frequency of typologies landscape relative anthropogenic stressors identify potential conservation needs. Location Eastern Methods Fish communities at 956 least‐disturbed sampling were characterized using taxonomic functional composition native species. Environmental variables summarized within included discharge, channel...

Identifying how close species live to their physiological thermal maxima is essential understand historical warm‐edge elevational limits of montane faunas and forecast upslope shifts caused by future climate change. We used laboratory experiments quantify the tolerance acclimation potential four fishes ( Notropis leuciodus , N. rubricroceus Etheostoma rufilineatum E. chlorobranchium ) that are endemic southern Appalachian Mountains (USA), exhibit different limits, represent two most...

Integrating thermal physiology with environmental temperature is essential to understanding distributions of species and vulnerability climate change. Warming tolerance – the difference between an organism's maximum ( T max ) habitat hab frequently used integrate organismal sensitivity exposure. Traditionally, applications warming define as invariable magnitudes, yet magnitude depends on exposure duration, diel cycles expose organisms a range magnitudes durations. How traditional (i.e....

Abstract Freshwaters account for 0.8% of Earth's surface area, yet support >10% known plant and animal species making them disproportionately biodiverse. Modern molecular techniques have begun to reveal microbial diversity, but application these approaches address global biogeography is relatively unknown in freshwaters. Our aim was identify gaps data coverage along climatic landscape disturbance gradients among terrestrial biomes hydrographic regions all freshwater ecosystems three...

Top–down control exerted by macroconsumers can strongly affect lower trophic levels and ecosystem processes. Studies of effects on primary consumers in streams have been focused algae, bacteria are largely unknown. We manipulated the density an omnivorous, grazing minnow, central stoneroller (Campostoma anomalum), experimental stream mesocosms (treatments with 0, 1, 2, 3, 4, 5, 6, or 7 individuals) to understand consumer algal bacterial abundance (chlorophyll a [Chl a] extraction, cell...

Abstract Rising water temperature under climate change is affecting the physiology, population dynamics and geographic distribution of freshwater taxa. We propose a novel application individual-based bioenergetics modelling (BEM) to assess physiological impacts warming on fishes across broad spatial extents. test this approach using Guadalupe bass (Micropterus treculii), species conservation recreational significance that endemic central TX, USA. projected historical-to-future changes...

Replacement of fish species by their congeners along gradients stream size is common in warm-water streams, but the causative environmental factors driving this turnover are not fully understood. We used laboratory experiments to test for differences temperature-dependent egg hatch success and age-0 food ration three congeneric cyprinids that differ abundance temperature–stream gradients. Headwater (Pimephales promelas Pimephales notatus) had lower thermal optima narrower breadths compared...

To determine if the strategy of spawning in saucer-like depressions is obligate or facultative for longfin dace (Agosia chrysogaster), we collected adults from four sites upper Gila River (southwestern New Mexico), stocked them separate outdoor stream-mesocosms lined with cobble substrate, and made daily observations presence saucer-nests hatched larvae. Larvae were observed three mesocosms emerged at temperatures ranging 19.2–24.0°C. The absence all throughout study indicates that can spawn...