The unpredictability of scyphozoan jellyfish blooms

Frontiers in Marine Science, Journal Year: 2024, Volume and Issue: 11

Published: Feb. 2, 2024

The study of jellyfish blooms has gained attention in the recent decades because importance forecasting and anticipating them avoiding their interference with human activities. However, after thirty years scientific effort (monitoring systems, empirical laboratory field studies, modeling, etc.), occurrence remains unpredictable, consequences unavoidable. Climate change, eutrophication, overfishing, coastal construction, species translocation have been suggested as stressors that increase them, but robust evidence to support these claims is limited. widespread belief are “increasing number” challenged years. Among gelatinous zooplankton, bloom forming concentrated class Scyphozoa, number at least one recorded increased during last decade. analyses long-term time series show seasonality dynamic each blooming population, vary intensity there an unexplained absence jellyfish. In this review, we focus on current state knowledge, uncertainties gaps critical points can strongly influence or even lead medusa population. These include ephyrae, planulae scyphistoma natural, predatory fishing mortality, molecular pathway strobilation, benthic population dynamics, planula settlement ephyra transition success. Some account for certain under controlled conditions, difficult be studied field, different sources non-typically variability need addressed improve our understanding dynamics.

Language: Английский

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The protection of coastal lagoons as a nature-based solution to mitigate coastal floods

Current Opinion in Environmental Science & Health, Journal Year: 2023, Volume and Issue: 34, P. 100491 - 100491

Published: June 19, 2023

Language: Английский

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Effect of river damming on nutrient transport and transformation and its countermeasures

Frontiers in Marine Science, Journal Year: 2022, Volume and Issue: 9

Published: Nov. 21, 2022

In recent decades, damming has become one of the most important anthropogenic activities for river regulation, and reservoirs have hotspots biogeochemical cycling. The construction dams changes riverine hydrological conditions alters physical, chemical, biological characteristics rivers, eventually leading to significant variations in nutrient This review mainly explores effects on transport transformation, including i) (N, P, Si, C) retention reservoirs, ii) greenhouse gas (GHG) emissions, iii) interactions between stoichiometry ratio health reservoir ecosystem. drivers such as connectivity, hydraulic residence time, hydropower development mode, microbial community variation, pollution, also been discussed. addition, strategies recover from negative aquatic ecosystems are summarized analyzed. To provide theoretical scientific support ecological environmental preservation river-reservoir systems, future studies should focus accumulation GHG emissions cascade reservoirs.

Language: Английский

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Temporal drivers of abundance and community structure of scyphozoan jellyfish in tropical coastal waters

PeerJ, Journal Year: 2025, Volume and Issue: 13, P. e18483 - e18483

Published: Jan. 16, 2025

Population blooms of scyphozoan jellyfish in tropical shallow water regions can fuel localized fisheries but also negatively impact human welfare. However, there is a lack baseline ecological data regarding the scyphozoans region, which could be used to manage fast-growing fishery and mitigate potential impacts. Thus, this study aims investigate temporal factors driving distribution community along environmental gradients under different monsoon seasons, rainfall periods, moon phases, diel-tidal conditions Klang Strait located central region west coast Peninsular Malaysia, where bloom events are increasing. Scyphozoan samples were collected using commercial bag nets during 19-month survey. Temporal variations species abundance composition evident related local parameters (salinity, dissolved oxygen, temperature, turbidity, pH) that varied with regional events, although these effects appeared species-specific. Phyllorhiza punctata, Acromitus flagellatus, Lychnorhiza malayensis, Rhopilema esculentum more abundant wetter northeast (NEM) while Chrysaora chinensis Lobonemoides robustus increased drier southwest (SWM). During wet period NEM, was generally higher daytime than night-time. The regime hydrological account for nearshore area concurrent threats coastal tourism power plants, as well benefits especially NEM.

Language: Английский

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Spatial and Temporal Scales of Variability of Mollusks in a Strongly Threatened Mediterranean Coastal Lagoon (Mar Menor, Murcia, Spain)

Water, Journal Year: 2025, Volume and Issue: 17(5), P. 657 - 657

Published: Feb. 24, 2025

Coastal lagoons are dynamic and highly productive systems that offer a remarkable number of ecological services benefits for humans. However, our understanding them is still far from adequate. The Mar Menor lagoon an ecosystem subject to anthropogenic pressures have worsened in recent years. These include coastal works, such as dredging sand dumping, well changes agricultural regimes induced process eutrophication set off alarms after the eutrophic crisis occurred 2016. Benthic organisms, particular mollusks, very sensitive environmental variations, often serving indicators these changes. This work analyzes malacofauna 1981 2019 context it during Eighty-six species been recorded throughout study period, richness, abundances, local assemblage structures, along with main parameters water column (salinity, temperature, chlorophyll concentration) used explain composition communities habitats detect their spatial temporal variations. With information provided, complete inventory mollusks reported has updated 126 species. results indicate that, almost 40 years, total remained relatively constant, but high percentage occasional rare species, rate change one another over time, accompanied by variations abundance dominance some compared others depending on conditions undergone. heterogeneity detected determined restricted connectivity open sea, diversity environments habitats, due human actions.

Language: Английский

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Adsorptive removal of organics and nutrients from septic tank effluent using oak wood chip biochar: Kinetic analysis and numerical modeling

Cleaner Water, Journal Year: 2025, Volume and Issue: unknown, P. 100073 - 100073

Published: Feb. 1, 2025

Language: Английский

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Stable benthic assemblages in highly dynamic ecosystems: a six-year survey in coastal lagoons of Uruguay, South America

Hydrobiologia, Journal Year: 2025, Volume and Issue: unknown

Published: March 3, 2025

Language: Английский

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Coupling SWAT+ and GOTM-WET models to assess agricultural management practices for mitigating harmful algal blooms in Mar Menor, Spain

Journal of Environmental Management, Journal Year: 2025, Volume and Issue: 380, P. 125033 - 125033

Published: March 23, 2025

We analysed the effectiveness of agricultural best management practices (BMPs) for mitigating harmful algal blooms (HABs) in Mar Menor lagoon, Spain, by coupling SWAT + catchment and GOTM-WET lake models. compared different BMP scenarios, including "vegetative filter strips", "contour farming", "fertilizer reduction", "crop rotation", their combination reducing high chlorophyll a (Chl-a) events over period 2003-2022. All BMPs significantly reduced nutrient inputs entering which limited formation HABs. The scenario that combined all was most effective controlling HABs, decreasing numbers days with HABs 81 %, Chl-a 50 % during periods This mainly explained crop rotation, fertilizer reduction vegetative strips differentially (e.g. rotation nitrogen 47.4 phosphorus 31.8 %). Contour farming least inputs, thus (1.6 5.8 HAB). results suggest dynamics are controlled interactive effects forms, where orthophosphate plays key role initiating is then maintained concentrations. research underscores relevance effectively driven eutrophication coastal vulnerable aquatic ecosystems like Menor. Coupling SWAT+ models, moved beyond solely simulations allowed incorporation lagoon responses to HAB prevention.

Language: Английский

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Changes in macrozoobenthic assemblages of a coastal lagoon in the context of long-term human pressures and a eutrophication process

Marine Environmental Research, Journal Year: 2025, Volume and Issue: 208, P. 107145 - 107145

Published: April 12, 2025

Coastal lagoons have long been perceived as simple, uniform and naturally stressed habitats, but recent research reveals that these ecosystems may be more complex, heterogeneous, structured than anticipated, with an unexpected homeostatic resilience capacity to respond anthropogenic pressures. In addition, they are considered among the highest biological productivity most valuable in terms of socioeconomic importance. However, face numerous challenges almost general lack planning hinders effective protection against pressures like agriculture, fishing, aquaculture, mining, tourism, coastal works, industrial pollution or eutrophication. This study represents a long-term analysis changes composition structure macrozoobenthic assemblages main habitats Mar Menor lagoon, their response severe eutrophic break episode, framed eutrophication process human lagoon has suffering for last 40 years. Four time periods studied, since 1980s, established reference quality benthic communities. 99 taxa (3 Phyla, 1 Class 95 Families) identified. The environmental characteristics assemblage descriptors seven representative hard soft bottom served discuss change undergoing spatiotemporal variability. dynamics communities is result multiple processes interact impacts. mechanisms permitted maintaining ecosystem integrity two decades nutrient input mainly based on channelling primary production towards communities, export excess production. During high less abrupt increases nutrients, responds by increasing populations some species trophic strategies sequence filter-feeders, herbivorous deposit feeders. All this complex scenario spatial temporal heterogeneity conditions assemblages, replacement framework restricted connectivity random colonization from open sea.

Language: Английский

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Phytoplankton dynamics in the Mar Menor, a Mediterranean coastal lagoon strongly impacted by eutrophication

Marine Pollution Bulletin, Journal Year: 2023, Volume and Issue: 192, P. 115074 - 115074

Published: May 24, 2023

The Mar Menor hypersaline coastal lagoon has suffered serious degradation in the last three decades attributable to nutrient pollution. In 2015, experienced an intensive bloom of cyanobacteria that triggered a drastic change its ecosystem. Our analyses indicate phytoplankton 2016-2021 did not present seasonal variability pattern; community was mainly dominated by diatoms and punctually reached abundance peaks above 107 cell L-1 along with chlorophyll concentrations exceeding 20 μg L-1. predominant diatom genera during these blooms were different as well conditions under which they produced. These high abundances are unprecedented lagoon; fact, our data taxonomic composition, time variation patterns differ notably comparison published before 2015. Consequently, results support finding trophic status changed profoundly.

Language: Английский

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