Freshwater springs on intertidal sand flats cause a switch in dominance among polychaete worms

Zipperle, Andreas M.; Reise, Karsten

doi:10.1016/j.seares.2005.01.003

Cited by 55 publications

(52 citation statements)

References 32 publications

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“…3). Zipperle & Reise (2005) found elevated amounts of clay particles near fresh groundwater springs in the intertidal zone, probably transported vertically from a deeper clay layer. In our study, seepage sediments in Seokmo Island exhibited a lower mud content compared to dry sediments (Fig.…”

Section: Sediment Propertiesmentioning

confidence: 91%

“…Due to changes in the hydraulic gradient at low tide, groundwater can form seepage areas in the intertidal zone that are often visually and geochemically distinct. The existence of these seepage areas has been described for several regions worldwide, such as the Perth region along the west coast of Australia, the German Wadden Sea, and beaches along the US East coast (Johannes 1980, Miller & Ullman 2004, Zipperle & Reise 2005, Santos et al 2009). We investigated 2 intertidal zones on the Korean western coast: first, one station on Seokmo Island, northwest of Seoul (Fig.…”

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confidence: 99%

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Differences in microphytobenthos and macrofaunal abundances associated with groundwater discharge in the intertidal zone

Waska¹,

Kim²

2010

Mar. Ecol. Prog. Ser.

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We investigated the impact of intertidal groundwater seepage on benthic microalgae and macrofauna in 4 study sites located in 2 large tidal flat ecosystems along the western coast of Korea by comparing the chemical, physical, and biological characteristics of 'glossy' seepage sites with those of nearby areas without visually distinct groundwater discharge (dry sediment surface). At 3 of the 4 sites, sediment properties as well as pore water chemistry were similar in groundwater seepage and dry areas. At the 4th study site, the groundwater seepage areas were more coarsegrained compared to the dry areas. Here, the groundwater seepage also had lower salinity and higher nutrient concentrations than the pore water of the dry area and the seawater in a nearby tide pool. Although diatoms were the dominant algal class in seepage and dry areas alike, the seepage areas in 3 of the sites had elevated contributions of other marker pigments such as chlorophyll (chl) b compared to the dry areas. Chl a concentrations were higher in all seepage areas compared to dry areas, and all dry areas had high pheophytin a:chl a ratios, indicating a substantial amount of degraded algal material. In the seepage areas of 3 of the sites, we found large numbers of the snail Batillaria cumingi, while crab burrows of Scopimera sp. were only present in the neighboring dry areas. Correlations of sediment chl a concentrations with physicochemical properties of the ambient pore water indicated that microphytobenthos responded specifically to groundwater seepage, which may provide shelter from desiccation and salt stress during emersion of the tidal flat. Our results suggest that globally common groundwater seepage significantly impacts the ecosystem structures and microphytobenthos production of the tidal flats.KEY WORDS: Groundwater · Seepage · Microphytobenthos · Macrofauna · Intertidal · Pigments · Tidal flat Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 407: [159][160][161][162][163][164][165][166][167][168][169][170][171][172] 2010 Intertidal microphytobenthos, i.e. the assemblage of bottom-living microalgae such as diatoms, is an important contributor to the benthic food chain (MacIntyre et al. 1996, Kang et al. 2003. Through resuspension, microphytobenthos can be transferred to pelagic systems as well (De Jonge & van Beusekom 1992). Furthermore, microphytobenthos can regulate diffusive nutrient fluxes between sediment and the overlying water column (Sundbäck et al. 1991). The relationship between microphytobenthos and ambient nutrient concentrations is often unclear. Generally, benthic microalgae, particularly from muddy sediments, are not nutrient limited (Underwood & Kromkamp 1999), and nutrient enrichment via the water column does not seem to have any effect on microphytobenthos biomass (Hillebrand & Kahlert 2002). On the other hand, microphytobenthos cultures can be maintained well with natural porewater (Admiraal et al. 1982), and microphytobenthos mats in the sandy sediment...

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Section: Sediment Propertiesmentioning

confidence: 91%

mentioning

confidence: 99%

Differences in microphytobenthos and macrofaunal abundances associated with groundwater discharge in the intertidal zone

Waska¹,

Kim²

2010

Mar. Ecol. Prog. Ser.

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“…Arenicola marina was found to have signiWcant positive eVects on the abundance of several other meio-and macrobenthic species around the burrow (Reise and Ax 1979;Lackschewitz and Reise 1998), while sedentary species near the surface were negatively aVected (Flach and de Bruin 1993;Zipperle and Reise 2005). Negative eVects of this bioturbator on tube-building species were mainly attributed to unstable conditions in the presence of lugworm feeding activity (Brey 1991;Flach 1992).…”

Section: Lugworms Inhibit Tube-building Polychaetesmentioning

confidence: 98%

Sediment destabilizing and stabilizing bio-engineers on tidal flats: cascading effects of experimental exclusion

2008

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Bioturbating lugworms (Arenicola marina)were excluded from 400 m² plots of intertidal sand which initiated sequences of direct and indirect changes in the structure of the benthic community. The sessile, tube-building species Polydora cornuta and Lanice conchilega took advantage of the absence of lugworms and settled preferentially on lugworm exclusion plots. The protruding tubes provided attachment for an ephemeral development of algal tufts (Berkeleya colonies and Enteromorpha thalli) which in turn enhanced settlement of the juvenile drifting clams Mya arenaria and Macoma balthica. This causal chain of enhanced bivalve settlement in the presence of aboveground structures, like animal tubes and algae, on lugworm exclusion plots occurred in 2 years at diVerent tidal zones with diVerent tube builders, algae and juvenile clams. A signiWcant response of L. conchilega in a year with relatively low lugworm abundances at the entire site suggests that not only the actual absence of large bioturbators was responsible for the establishment of tube-dwelling species, but also a cumulative change of the sediment in exclusion plots since the onset of the experiment. While the sediment on lugworm plots remained permeable, Wne particles and organic matter accumulated at exclusion plots. It is suggested that these diVerences in sediment characteristics were the product of divergent benthic engineering by sediment destabilizing lugworms on control plots and sediment stabilizing species on exclusion plots. Cumulative changes of the sedimentary habitat and cascading eVects in the benthic community may explain the persistence of patches that are dominated by either sediment stabilizing or destabilizing species in the assemblage mosaic of intertidal sediments.

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“…Gabriel et al 2003) or near the island of Sylt (cf. Zipperle and Reise 2005). At the site near Sahlenburg (Fig.…”

Section: Study Areasmentioning

confidence: 99%

228Ra, 226Ra, 224Ra and 223Ra in potential sources and sinks of land-derived material in the German Bight of the North Sea: implications for the use of radium as a tracer

et al. 2011

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Freshwater springs on intertidal sand flats cause a switch in dominance among polychaete worms

Cited by 55 publications

References 32 publications

Differences in microphytobenthos and macrofaunal abundances associated with groundwater discharge in the intertidal zone

Differences in microphytobenthos and macrofaunal abundances associated with groundwater discharge in the intertidal zone

Sediment destabilizing and stabilizing bio-engineers on tidal flats: cascading effects of experimental exclusion

228Ra, 226Ra, 224Ra and 223Ra in potential sources and sinks of land-derived material in the German Bight of the North Sea: implications for the use of radium as a tracer

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