Drifting algal mats as an alternative habitat for benthic invertebrates:

Norkko, Joanna; Bonsdorff, Erik; Norkko, Alf

doi:10.1016/s0022-0981(00)00155-6

Cited by 201 publications

(146 citation statements)

References 56 publications

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“…In the absence of macroalgal blooms and anoxic conditions, these species could grow to adult size, as seen for Hediste diversicolor. This species is also tolerant to hypoxia, anoxia and is commonly found under algal mats (Pearson and Rosenberg, 1978;Norkko and Bonsdorff, 1996), but unlike C. capitata, seems able to take advantage of less stressful conditions (Cardoso et al, 2004b), possibly because of its better competitive ability and its capacity to feed as an omnivore, predator, suspension feeder and deposit feeder (Norkko et al, 2000). In contrast to previous studies (e.g.…”

Section: Polychaetesmentioning

confidence: 74%

Polychaete assemblages as indicators of habitat recovery in a temperate estuary under eutrophication

Cardoso

Bankovic

Raffaelli

et al. 2007

Estuarine, Coastal and Shelf Science

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From 1980 to 2000, the Mondego estuary (Portugal) suffered dramatic changes due to eutrophication, leading to a decline in seagrass beds and changes in community structure, namely a decline in species richness and replacement of herbivores by detritivores. Because the conservation status of the estuary was being compromised, a restoration project was implemented in 1998 in order to restore the original natural seagrass habitat. This project included several restoration/management measures, including the protection of the remaining seagrass patches and improvement of the hydraulic conditions through modifying sluice opening regimes, thereby reducing the nutrient loading in the southern arm of the estuary. In addition, several stakeholder forums were convened to inform local people of the ecological and economic importance of the area. In this paper we evaluate the success of this management plan as judged by changes in the polychaete assemblages.In the year following implementation of the restoration measures, the total biomass of polychaetes increased markedly, a pattern also seen in the overall macrobenthic community. Biomass recovery was faster and more pronounced compared to density recovery, probably because many larger species were able to attain adult body size (e.g. Hediste diversicolor). The polychaetes Alkmaria romijni and Capitella capitata, considered as indicators of nutrient enrichment and pollution of estuarine systems, gradually declined over time. A general increase in species diversity was observed after the application of the restoration/management measures.These changes indicate that the restoration project has been successful and that polychaetes can be considered representative indicators of the wider macrobenthic community, with considerable savings in time and effort for monitoring programmes.

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Section: Polychaetesmentioning

confidence: 74%

Polychaete assemblages as indicators of habitat recovery in a temperate estuary under eutrophication

Cardoso

Bankovic

Raffaelli

et al. 2007

Estuarine, Coastal and Shelf Science

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“…Like many other estuaries worldwide (McMahon and Walker, 1998;Beukema et al, 1999;Norkko and Bonsdorff, 2000;Sfriso et al, 2001), the Mondego estuary has been under environmental stress by eutrophication processes. As a consequence, the seagrass (Zostera noltii) bed has almost disappeared, reducing in extent from 15 ha in the early 1980's to 0.02 ha in the mid-1990's (e.g.…”

Section: Introductionmentioning

confidence: 99%

Management of a shallow temperate estuary to control eutrophication: The effect of hydrodynamics on the system’s nutrient loading

Lillebø

Neto

Martins

et al. 2005

Estuarine, Coastal and Shelf Science

114

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The Mondego estuary, a shallow warm-temperate intertidal system located on the west coast of Portugal, has for some decades been under severe ecological stress, mainly caused by eutrophication. Water circulation in this system was, until 1998, mainly dependent on tides and on the freshwater input of a small tributary artificially controlled by a sluice. After 1998, the sluice opening was effectively minimised to reduce the nutrient loading, and the system hydrodynamics improved due to engineering work in the upstream areas. The objective of the present study was to evaluate the effect of the mitigation measures implemented in 1998. Changes to the hydrodynamics of the system were assessed using precipitation and salinity data in relation to the concentrations of dissolved inorganic nutrients, as well as the linkage between dissolved N:P ratios and the biological parameters (phytoplankton chlorophyll a concentrations, green macroalgal biomass and seagrass biomass). Two distinctive periods were compared, over a ten year period: from January 1993 to January 1997 and from January 1999 until January 2003. The effective reduction in the dissolved N:P atomic ratio from 37.7 to 13.2 after 1998 is a result of lowered ammonia, but not the oxidised forms of nitrogen (nitrate plus nitrite), or increased concentrations of dissolved inorganic phosphorus. Results suggest that the phytoplankton is not nutrient limited, yet maximum and mean biomass of green macroalgae was reduced by one order of magnitude after the mitigation measures. This suggests that besides lowering the water residence time of the system, macroalgal growth became nitrogen limited. In parallel to these changes the seagrass-covered area and biomass of Zostera noltii showed signs of recovery.

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“…Macroalgal mats have been acknowledged as a factor inducing widespread mortality in organisms of limited mobility, such as infaunal bivalve species (Petersen et al 1994, Norkko et al 2000, Marsden & Bressington 2009. The most destructive factor connected to algal mats is hypoxia or anoxia, often accompanied by the release of sulfide from sediments (Lavery & McComb 1991, Krause-Jensen et al 1999, Lauringson & Kotta 2006.…”

Section: Discussionmentioning

confidence: 99%

“…Drifting algal mats in temperate coastal waters are becoming an increasingly common phenomenon along the world s shorelines as a result of coastal eutrophication (Fletcher 1996, Valiela et al 1997, Norkko et al 2000, Marsden & Bressington 2009, Ye et al 2011, Gubelit 2015. For instance, the coastline of the Yellow Sea experienced the world s largest green tide in 2008 that comprised more than 1 million tons of algal biomass (Ulva prolifera Mueller) and covered an area of 13,000-30,000 km 2 (Leliaert et al 2008, Sun et al 2008, Liu et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Temperature-dependent adverse effects of drifting macroalgae on the survival of Manila clams in a eutrophic coastal lagoon

Miyamoto¹,

Yamada

Hatakeyama³

et al. 2017

Plankton Benthos Res

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Abstract:The proliferation of drifting macroalgae and the accompanying occurrence of the impoverishment of zoobenthic species has become a major problem worldwide. We examined the temperature dependency of the effects of macroalgae on the survival of Manila clams in Nakaumi Lagoon in western Japan. We conducted (i) semi-monthly field surveys to clarify seasonal changes in macroalgal abundance and clam density and (ii) 7-day macroalgal enclosing and excluding experiments in two temperature settings (mean water temperatures: 19 and 29°C) to test temperature-induced differences in algal effects on bottom-water redox conditions and clam survival. Clam density decreased during summer (July-September), when increased coverage and thickness of drifting macroalgae was observed. In contrast, clam density increased from autumn to spring as macroalgal abundance decreased. Further, reducing conditions (Eh<0) were only detected in bottom waters in the presence of macroalgae during summer (water temperature >29°C), suggesting that drifting macroalgae induced hypoxia under summer temperatures and consequently led to clam mortality. The 7-day algal enclosure experiment resulted in reducing bottom water conditions when mean water temperature was 29°C. Further, clam survival decreased in the algal enclosure at 29°C, whereas no such changes were detected at 19°C. These results indicate that the effects of drifting macroalgae on the geochemical environment and clam survival are temperature dependent; therefore, global warming may enhance the likelihood of macroalgae-induced hypoxia with its associated adverse consequences in marine life.

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Drifting algal mats as an alternative habitat for benthic invertebrates:

Cited by 201 publications

References 56 publications

Polychaete assemblages as indicators of habitat recovery in a temperate estuary under eutrophication

Polychaete assemblages as indicators of habitat recovery in a temperate estuary under eutrophication

Management of a shallow temperate estuary to control eutrophication: The effect of hydrodynamics on the system’s nutrient loading

Temperature-dependent adverse effects of drifting macroalgae on the survival of Manila clams in a eutrophic coastal lagoon

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