Coupling between macroalgal inputs and nutrients outcrop in exposed sandy beaches

Barreiro, Francisco; Gómez, Marina; López, J.; Lastra, Mariano; Huz, R. de la

doi:10.1007/s10750-012-1220-z

Cited by 29 publications

(20 citation statements)

References 64 publications

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“…, Barreiro et al. , Lavery et al. ), and increased nutrient availability due to wrack trapping by fringe mangroves could favor the growth of fringe mangroves (Feller et al.…”

Section: Discussionmentioning

confidence: 99%

Coastal regime shifts: rapid responses of coastal wetlands to changes in mangrove cover

Guo

Weaver

Charles

et al. 2017

Ecology

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Global changes are causing broad-scale shifts in vegetation communities worldwide, including coastal habitats where the borders between mangroves and salt marsh are in flux. Coastal habitats provide numerous ecosystem services of high economic value, but the consequences of variation in mangrove cover are poorly known. We experimentally manipulated mangrove cover in large plots to test a set of linked hypotheses regarding the effects of changes in mangrove cover. We found that changes in mangrove cover had strong effects on microclimate, plant community, sediment accretion, soil organic content, and bird abundance within 2 yr. At higher mangrove cover, wind speed declined and light interception by vegetation increased. Air and soil temperatures had hump-shaped relationships with mangrove cover. The cover of salt marsh plants decreased at higher mangrove cover. Wrack cover, the distance that wrack was distributed from the water's edge, and sediment accretion decreased at higher mangrove cover. Soil organic content increased with mangrove cover. Wading bird abundance decreased at higher mangrove cover. Many of these relationships were non-linear, with the greatest effects when mangrove cover varied from zero to intermediate values, and lesser effects when mangrove cover varied from intermediate to high values. Temporal and spatial variation in measured variables often peaked at intermediate mangrove cover, with ecological consequences that are largely unexplored. Because different processes varied in different ways with mangrove cover, the "optimum" cover of mangroves from a societal point of view will depend on which ecosystem services are most desired.

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“…, Barreiro et al. , Lavery et al. ), and increased nutrient availability due to wrack trapping by fringe mangroves could favor the growth of fringe mangroves (Feller et al.…”

Section: Discussionmentioning

confidence: 99%

Coastal regime shifts: rapid responses of coastal wetlands to changes in mangrove cover

Guo

Weaver

Charles

et al. 2017

Ecology

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“…Besides temperature, the decaying stage of the algal patches determined the biogeochemical fate of the wrack biomass, meaning that aged algae delivered larger decomposition outputs, compared with those from fresh algal patches. The transformation of organic matter into inorganic nutrient that fertilize the coastal waters is considered an important ecosystem service of exposed sandy beaches (Schlacher et al., , ); wrack processing implements a substantial feedback that connects high productive macrophyte‐based environments, such as rocky shores, with the low productive neighbouring sandy shores (Barreiro et al., ). The degradative pathway for mineralizing organic matter and the consequent nutrient release to the interstitial environment was enhanced in the OTC sites.…”

Section: Discussionmentioning

confidence: 99%

“…The sediment samples (10 g approx.) were shaken in the dark for 2 hr in 25 ml, 0.01 mol/L KCl solution for inorganic N extraction; the solution was then centrifuged at 4645 g 10 min and the filtered extract (quantitative filter paper of 2–4 μm) was stored at −20°C until processing (Barreiro, Gómez, López, Lastra, & de la Huz, ). Nutrients were quantified by continuous flow analysis in a Bran Luebbe Nutrient Analyzer AA3.…”

Section: Methodsmentioning

confidence: 99%

“…To allow for comparison with studies where nutrient concentration were measured in pore water, data on μ m /g of dry sand were transformed to μ m , following Brooks et al. (), assuming 40% of saturation volume (Barreiro et al., ; Charbonnier, Anschutz, Poirier, Bujan, & Lecroart, ) and a dilution factor of 1.77 (25 ml) accountable to the extraction method.…”

Section: Methodsmentioning

confidence: 99%

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Warming intensify CO₂ flux and nutrient release from algal wrack subsidies on sandy beaches

Lastra

López

Rodil

2018

Global Change Biology

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Algal wrack subsidies underpin most of the food web structure of exposed sandy beaches and are responsible of important biogeochemical processes that link marine and terrestrial ecosystems. The response in decomposition of algal wrack deposits to global warming has not been studied in ocean-exposed sandy beaches to date. With this aim, passive open top chambers (OTCs) were used to increase soil temperature within the range predicted by the IPCC for western Europe (between 0.5 and 1.5°C), following the hypothesis that the biogeochemical processing of macroalgal wrack subsidies would accelerate in response to temperature increase. The effect of temperature manipulation on three target substrates: fresh and aged macroalgae, and bare sand, was tested. Results indicated that a small warming (<0.5°C) affected the wrack decomposition process through traceable increases in soil respiration through CO flux, inorganic nutrients within the interstitial environment (N and P), sediment organic contents measured through the amount of proteins and microbial pool through the total soil DNA. The different responses of soil variables in the studied substrates indicated that the decomposition stage of stranded macroalgae influences the biogeochemical processing of organic matter in sandy beaches. Thus, CO fluxes, releases of organic and inorganic nutrients and microbial activity intensify in aged wrack deposits. Our results predict that expected global warming will increase the release of inorganic nutrients to the coastal ocean by 30% for the N (21 Gg/year) and 5.9% for P (14 Gg/year); that increase for the flow of C to the atmosphere as CO was estimated in 8.2% (523 Gg/year). This study confirms the key role of sandy beaches in recycling ocean-derived organic matter, highlighting their sensitivity to a changing scenario of global warming that predicts significant increases in temperature over the next few decades.

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“…Moreover, this disturbance could have a cascade effect on coastal food webs (Spiller et al 2010). The removal of wrack and their associated fauna could result in a loss of recycled nutrients and detrital material, which form the basis for primary production and food chains of nearshore waters (Dugan et al 2011;Barreiro et al 2013). Moreover, the effect of wrack removal can change locally due to variation in the density of sandhoppers, which is determined by both beach morphodynamic state and wrack features (biomass and composition).…”

Section: Communicated By Judy Grasslementioning

confidence: 99%

Wrack Removal as Short-Term Disturbance for Talitrus Saltator Density in the Supratidal Zone of Sandy Beaches: an Experimental Approach

Ruiz-Delgado

Vieira

Reyes-Martínez

et al. 2015

Estuaries and Coasts

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A distinctive feature of sandy beaches is the stranded wrack, which represents a key element in the maintenance of their biodiversity and ecosystem function. However, these materials are commonly removed from beaches worldwide. In October-November 2012, a field experiment following an M-BACI design was conducted to assess the effect of wrack removal on sandhopper populations on two sandy beaches on the Atlantic southwest coast of Spain. The beaches, Levante (36°33′N, 6°13′W) and Cortadura (36°28′N, 6°15′ W) differed in their morphodynamics (dissipative and intermediate, respectively) and in the dominant wrack sources (seagrasses vs. macroalgae). Wrack removal diminished the density of the sandhopper, Talitrus saltator, a dominant species in the supratidal zone especially under wrack, but the difference between impacted and control plots was shortlived (several days). Juvenile sandhoppers appeared more sensitive to this disturbance than adults, although this was found only at Levante. This study highlights the adaptability of this sandhopper to a single wrack removal event and shows that the magnitude of the effect is likely dependent on the particular characteristics of individual beaches. The consequences of frequent wrack removal from these beaches on sandhopper populations remain to be determined.

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Coupling between macroalgal inputs and nutrients outcrop in exposed sandy beaches

Cited by 29 publications

References 64 publications

Coastal regime shifts: rapid responses of coastal wetlands to changes in mangrove cover

Coastal regime shifts: rapid responses of coastal wetlands to changes in mangrove cover

Warming intensify CO₂ flux and nutrient release from algal wrack subsidies on sandy beaches

Wrack Removal as Short-Term Disturbance for Talitrus Saltator Density in the Supratidal Zone of Sandy Beaches: an Experimental Approach

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Coupling between macroalgal inputs and nutrients outcrop in exposed sandy beaches

Cited by 29 publications

References 64 publications

Coastal regime shifts: rapid responses of coastal wetlands to changes in mangrove cover

Coastal regime shifts: rapid responses of coastal wetlands to changes in mangrove cover

Warming intensify CO2 flux and nutrient release from algal wrack subsidies on sandy beaches

Wrack Removal as Short-Term Disturbance for Talitrus Saltator Density in the Supratidal Zone of Sandy Beaches: an Experimental Approach

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Warming intensify CO₂ flux and nutrient release from algal wrack subsidies on sandy beaches