Benthic macrofauna under extremes DOI Open Access
Zhengquan Zhou

Published: Aug. 25, 2023

Extreme weather events are increasing in intensity, duration, and frequency, threatening tidal flat ecosystems due to global climate change. Benthic macrofauna plays essential roles biogeomorphic feedback as ecosystem engineers, yet they prone extreme environmental fluctuations storms drying regimes. Moreover, modern globalization has accelerated the invasion of introduced species, which compete with native species for natural resources. Therefore, studying how benthic responds climate-change-induced may convey an message on short-term equilibrium long-term development ecosystems. A mesocosm system was designed customized lab mimic heatwaves contrasting magnitudes durations flats. Simulated were imposed model bioturbator Cerastoderma edule living different micro-topographies sediment types, study response bioturbation activities under thermal stress (Chapters 2 & 3). Besides individual-level response, in-situ experiment applied effects repeated storm community structure, using a raking treatment storm-induced disturbance (Chapter 4). compound shift studied by imposing salinity settings heatwave profiles C. bivalve Ruditapes philippinarum 5). Macrobenthos' individual level is categorized into “fight, flight, or freeze” framework. Bioturbators increase metabolic rates “fight” against maintain optimal physiological conditions 2); burrowed deeper during low tide escape from (“flight”) stress, thereby causing more mixings 3); reduce activity metabolism (“freeze”) basic functions acute intermediate On level, internal can select specific biological traits, while unfitting traits decrease abundance create “disturbance-driven establishing windows” that benefit overtake

Language: Английский

Marine heatwaves amplify benthic community metabolism and solute flux in a seafloor heating experiment DOI Creative Commons
Norman Göbeler, L. Kauppi, Alf Norkko

et al.

Functional Ecology, Journal Year: 2025, Volume and Issue: unknown

Published: March 25, 2025

Abstract The magnitude and frequency of marine heatwaves are increasing predicted to intensify, but our ability understand the real‐world effects on vital benthic ecosystems is lagging behind. Prior insights into impacts often derived from observational or laboratory studies. Observational studies may not fully disentangle complexities potential compound events typically focus severe, lethal heatwaves. Laboratory studies, contrary, while valuable for understanding specific mechanisms, use artificial setups can introduce unnatural disturbances that do reflect scenarios. To investigate sublethal temperature in a natural habitat, we developed novel approach inducing elevated water temperatures situ over several days. system utilizes domestic underfloor heating technology combined with custom‐made chambers. We placed 10 chambers 15 days bare‐sediment habitat at 2.5 m depth heated five 5°C above ambient summer 6 days, followed by period 7 temperatures. Incubations during day night were performed experiment assess changes ecosystem functioning (solute fluxes) sediment cores collected end realistic heatwave community structure. results indicate structure remained similar between treatments, except size shift Marenzelleria spp. towards smaller individuals treatment, caused significant increase respiration amplified either efflux influx nutrients (NH 4 + ‐N, PO 3− ‐P Si). Primary production daytime incubations mostly unaffected contributing concept heterotrophy being more influenced increased than autotrophy. This study confirms suitability examining impact habitats demonstrates its investigation complex communities, which essential ecosystem‐level climate change. Read free Plain Language Summary this article Journal blog.

Language: Английский

Citations

1
Changes in macrofauna bioturbation during repeated heatwaves mediate changes in biogeochemical cycling of nutrients DOI Creative Commons
L. Kauppi, Norman Göbeler, Joanna Norkko

et al.

Frontiers in Marine Science, Journal Year: 2023, Volume and Issue: 9

Published: Jan. 16, 2023

The increasing frequency and intensity of marine heatwaves (MHWs) observed worldwide entails changes in the structure functioning ecological communities. While severe extreme often have more destructive effects, subtle effects moderate strong may nevertheless affect ecosystem through complex, context-dependent linkages between different processes. Here we conducted a laboratory experiment to study repeated short-term, MHWs on macrofauna bioturbation associated solute fluxes as measure using natural soft-sediment communities from Baltic Sea. Our results showed both biogeochemical cycling nutrients following heatwaves, which seemed contribute an enhanced degradation organic matter seafloor exchange solutes across sediment-water interface well increased sediment oxygen consumption. Following these processes, relative contribution environmental context was altered. highlight potential even shorter-term, having system-wide impacts due mechanistic process underpinning nutrients. This also highlights need wide range variables for comprehensive understanding under disturbances, such MHWs.

Language: Английский

Citations

8
Seafloor warm water temperature anomalies impact benthic macrofauna communities of a high-Arctic cold-water fjord DOI Creative Commons
Èric Jordà-Molina, Paul E. Renaud, Marc J. Silberberger

et al.

Marine Environmental Research, Journal Year: 2023, Volume and Issue: 189, P. 106046 - 106046

Published: June 5, 2023

Amid the alarming atmospheric and oceanic warming rates taking place in Arctic, western fjords around Svalbard archipelago are experiencing an increased frequency of warm water intrusions recent decades, causing ecological shifts their ecosystems. However, hardly anything is known about potential impacts on until recently considered stable colder northern fjords. We analyzed macrobenthic fauna from four locations Rijpfjorden (a high-Arctic fjord north Svalbard) along its axis, sampled intermittently years 2003, 2007, 2010, 2013 2017. After a strong seafloor temperature anomaly (SfWWTA) 2006, abundance individuals species richness dropped significantly across entire together with diversity declines at outer parts (reflected Shannon index drops) increases beta between inner fjord. period three temperatures higher sea-ice cover, communities recovered through recolonization processes by leading to homogenization community composition less diversity. For last two periods (2010-2013 2013-2017), gradually again, both sites started re-assemble different directions. A few taxa began dominate 2010 onwards parts, translating into evenness drops. The basin, however, although abundances, was partially protected fjordic sill these anomalies remained comparatively more regarding after disturbance event. Our results indicate that abundances were behind important spatio-temporal fluctuations, variations also driven occurrence-based macrofauna data, suggesting role rare taxa. This first multidecadal time series soft-bottom for fjord, indicating periodic marine heatwaves might drive structure, either direct effects thermal stress or changes environmental regimes led fluctuations (i.e. sea ice cover glacial runoff, which could lead primary production food supply benthos). Although be resilient some extent, sustained permanent cold-water benthic systems.

Language: Английский

Citations

6
Marine heatwaves of differing intensities lead to distinct patterns in seafloor functioning DOI Creative Commons
L. Kauppi, Anna Villnäs

Proceedings of the Royal Society B Biological Sciences, Journal Year: 2022, Volume and Issue: 289(1986)

Published: Nov. 9, 2022

Marine heatwaves (MHWs) are increasing in frequency and intensity due to climate change. Several well-documented effects of on community structure exist, but examples their effect functioning species, communities or ecosystems remain scarce. We tested the short-term, moderate strong MHWs macrofauna bioturbation associated solute fluxes as ecosystem functioning. also measured macrofaunal excretion rates assess temperature metabolism. For this experiment, we used unmanipulated sediment cores with natural animal collected from a muddy location at 32 m depth northern Baltic Sea. Despite mechanistic remaining unchanged between treatments, there were significant differences oxygen consumption, excretion. Biogeochemical biological processes boosted by heatwave, whereas biogeochemical cycling seemed decrease under heatwave. A prolonged, heatwave could possibly lead resource depletion if primary production cannot meet demands benthic consumption. By contrast, decreased degradation activities build-up organic material potentially hypoxia. The variability complexity response highlight context dependency these complicating future predictions.

Language: Английский

Citations

9
Potential advantage of invasive estuarine worms over native species under exposure to relevant concentrations of graphene oxide: behavioral and biochemical insights DOI Creative Commons

Maria João Figueiredo,

Cátia Venâncio, Paulo Cardoso

et al.

Marine Environmental Research, Journal Year: 2024, Volume and Issue: 202, P. 106821 - 106821

Published: Oct. 30, 2024

Language: Английский

Citations

1
Assessing the Impact of Arsenic on Benthic Estuarine Fauna Behavior: Implications for Ecosystem Sustainability DOI Open Access
Cátia Venâncio,

Letizia Degara,

Adília Pires

et al.

Sustainability, Journal Year: 2024, Volume and Issue: 16(22), P. 9728 - 9728

Published: Nov. 8, 2024

Estuaries are dynamic ecosystems exposed to a wide range of stressors, including metal (loid) contamination. The assessment the behavioral characteristics species inhabiting these may provide new point view on chemical contamination since behaviors generally regulate population dynamics and ecosystem stability. Therefore, this study aimed investigate changes in patterns three estuarine benthonic (the native polychaete Hediste diversicolor, non-native Arenicola marina, clam Scrobicularia plana) when different concentrations metalloid arsenic (0, 0.5, 1.5, 4.5, 13.5, 40.5 mg/kg sediment). Behavioral included bioturbation activity (measured by fluorescent particle remobilization) determination maximum penetration depth each species, both after 1 21 days exposure. After exposure, ability burrow was evaluated. Results showed that S. plana immediately reduced exposure As (day 1) but disappeared with time 21), whereas A. marina significantly increased from day 21, expressing their highest values sediments mg As/kg 21. For H. no were observed within or between times. burrowing assay nearly doubled its time, as well double at ≥1.5 sediment. These results suggest can be quite resilient over time. However, greater remobilization cause displacement fauna, disrupting natural mutualism created environments, possibly decreasing estuary functionality biodiversity. assessments under improve establishment more feasible protection goals for sustainable estuaries.

Language: Английский

Citations

0
Benthic macrofauna under extremes DOI Open Access
Zhengquan Zhou

Published: Aug. 25, 2023

Extreme weather events are increasing in intensity, duration, and frequency, threatening tidal flat ecosystems due to global climate change. Benthic macrofauna plays essential roles biogeomorphic feedback as ecosystem engineers, yet they prone extreme environmental fluctuations storms drying regimes. Moreover, modern globalization has accelerated the invasion of introduced species, which compete with native species for natural resources. Therefore, studying how benthic responds climate-change-induced may convey an message on short-term equilibrium long-term development ecosystems. A mesocosm system was designed customized lab mimic heatwaves contrasting magnitudes durations flats. Simulated were imposed model bioturbator Cerastoderma edule living different micro-topographies sediment types, study response bioturbation activities under thermal stress (Chapters 2 & 3). Besides individual-level response, in-situ experiment applied effects repeated storm community structure, using a raking treatment storm-induced disturbance (Chapter 4). compound shift studied by imposing salinity settings heatwave profiles C. bivalve Ruditapes philippinarum 5). Macrobenthos' individual level is categorized into “fight, flight, or freeze” framework. Bioturbators increase metabolic rates “fight” against maintain optimal physiological conditions 2); burrowed deeper during low tide escape from (“flight”) stress, thereby causing more mixings 3); reduce activity metabolism (“freeze”) basic functions acute intermediate On level, internal can select specific biological traits, while unfitting traits decrease abundance create “disturbance-driven establishing windows” that benefit overtake

Language: Английский

Citations

0