Expanding towards contraction: the alternation of floods and droughts as a fundamental component in river ecology

Biogeochemistry, Год журнала: 2025, Номер 168(1)

Опубликована: Янв. 3, 2025

Abstract Climate warming is causing more extreme weather conditions, with both larger and intense precipitation events as well extended periods of drought in many regions the world. The consequence an alteration hydrological regime streams rivers, increase probability conditions. Mediterranean-climate usually experience on a seasonal basis thus, freshwater Mediterranean ecosystems can be used natural laboratories for better understanding how climate will impact ecosystem structure functioning elsewhere. In this paper, we revisited contextualized historical new datasets collected at Fuirosos, well-studied intermittent stream naturally experiencing events, to illustrate alternation floods droughts influence hydrology, microbial assemblages, water chemistry, potential biogeochemical processing. Moreover, revised some most influential conceptual quantitative frameworks river ecology assess what extent they incorporate occurrence events. Based exercise, identified knowledge gaps challenges guide future research under intensification cycle. Ultimately, aimed share lessons learned from which help understand warming-induced impacts transport cycling matter fluvial ecosystems.

Язык: Английский

---

Are the Seasonal Dynamics of Zooplankton Different Between Contrasting Climatic Zones in Brazil? A Comparison Between Tropical and Subtropical Rivers

River Research and Applications, Год журнала: 2025, Номер unknown

Опубликована: Янв. 9, 2025

ABSTRACT The unique environmental characteristics of the tropics and subtropics, including precipitation patterns, photoperiods temperatures, can influence riverine zooplankton communities in contrasting ways. Therefore, we aimed to investigate seasonal dynamics tropical subtropical rivers compare structure response distinct climatic conditions. To this end, collected samples from located two different zones Brazil (tropical subtropical) during winter, spring, summer autumn. Our results showed that testate amoebae rotifers play a crucial role both zones, emerging as predominant groups regarding density, species richness diversity. In rivers, variations are strongly influenced by temperature flooding events, which affect total suspended solids, turbidity pH. closely linked fluctuations dissolved oxygen. We identified 142 taxa, with zone comprising 125 taxa 97 taxa. also revealed had greater diversity than rivers. This disparity was primarily attributed higher nutrient concentrations lower thermal amplitudes waters compared those waters. Thus, it is evident conditions have varying influences on dynamics, highlighting need consider regional management conservation aquatic ecosystems.

Язык: Английский

---

Anthropogenic nutrient inputs cause excessive algal growth for nearly half the world’s population

Nature Communications, Год журнала: 2025, Номер 16(1)

Опубликована: Фев. 20, 2025

Reference conditions pertain to without anthropogenic influence and serve gauge the degree of river pollution identify best attainable water quality. Here we show estimates global human footprint nitrogen phosphorus concentrations potential for related nuisance or harmful algal growth in rivers. We use statistical models based on 1.2 million stream nutrient measurements (from 2005 2013) find enrichment total is 35% 14% respectively. The greatest Europe (86 30% respectively) least Oceania (9 2% respectively). levels translated into an almost doubling catchment areas with rivers predicted have anthropogenically elevated potentially algae, affecting ~40% world's population. Focusing management difference between current reference can help protect good quality while avoiding unrealistic goals where are naturally high.

Язык: Английский

---

Ephemeral Wetland Macroinvertebrate Communities Across Climate Regions Share Similar Functional Trait Composition Despite Near‐Total Taxa Replacement

Freshwater Biology, Год журнала: 2025, Номер 70(4)

Опубликована: Апрель 1, 2025

ABSTRACT Community assembly in aquatic habitats is heavily influenced by hydrology, but understanding the influence of other habitat conditions also critical. Most studies focus on comparisons geographically close communities that exist under diverse hydrological regimes, this framework limits our ability to understand how than hydrology shape ephemeral wetland communities. Here, we investigated macroinvertebrate vary with local, landscape, and climate variables wetlands across a large geographic range few barriers. We sampled North Dakota, New Mexico, Texas (USA) 2021 Dakota Mexico 2022. used an array hydrographic, climate, spatial relate taxonomic functional community composition diversity conditions. Taxonomic was overwhelmingly different among states between years: landscape‐scale refuge availability explained variation composition, local climate‐scale only within context variables. Trait similar most sampling groups, distinct trait assemblages occurred No predictor variable matrix alone, arrangement predicted when considering overlapping Taxa indices were associated increased at landscape scale. Our results show consistent structure geographical scale hydrologically wetlands, despite almost complete turnover regions. Patterns imply incorporating multiple scales critical composition. Despite regimes potential for connectivity via dispersal, taxa replacement high regions single grassland macrosystem. overall change provided suite structuring Further, cases, elicits response

Язык: Английский

---

Spatiotemporal assessment of benthic macroinvertebrate communities in the Bermejo River Basin in the Ecuadorian Amazonia

Limnology and Oceanography Letters, Год журнала: 2025, Номер unknown

Опубликована: Апрель 26, 2025

Abstract The Cofán communities rely on the Bermejo Ecological Reserve for their survival and cultural practices. Due to rugged inaccessible topography of reserve in Northern Ecuadorian Amazon region, limited biomonitoring ecological characterization studies ecosystem health have been conducted. We investigated community composition functional structure benthic macroinvertebrates River basin by identifying bioindicators measuring physicochemical variables. Our results indicated that predators were consistently dominant taxa all sampled sites, taxonomic abundance was positively correlated with richness collector taxa. also observed positive relations between pH abundance, water temperature biological monitoring working party metric. Primary associations found feeding guilds, pollution‐sensitive taxa, indices. This work provided a first macroinvertebrate parameters basin.

Язык: Английский

---