Effects of crab burrows on pore water flows in salt marshes

Xin, Pei; Jin, Guangqiu; Li, Ling; Barry, David Andrew

doi:10.1016/j.advwatres.2008.12.008

Cited by 147 publications

(177 citation statements)

References 32 publications

(1 reference statement)

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“…A 3 m deep bore dug in the intertidal area revealed a homogenous muddy sediment column with groundwater flow clearly dominated by crab burrows. Crabs are often seen as mangrove ecosystem engineers (Kristensen 2008) and a number of modeling studies have demonstrated that crab burrows act as preferential groundwater pathways in other mangrove systems (Ridd 1996;Mazda and Ikeda 2006;Xin et al 2009). …”

Section: Discussionmentioning

confidence: 99%

Groundwater‐derived dissolved inorganic and organic carbon exports from a mangrove tidal creek: The missing mangrove carbon sink?

Maher

Santos

Golsby-Smith

et al. 2013

Limnology & Oceanography

302

241

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A majority of the global net primary production of mangroves is unaccounted for by current carbon budgets. It has been hypothesized that this ''missing carbon'' is exported as dissolved inorganic carbon (DIC) from subsurface respiration and groundwater (or pore-water) exchange driven by tidal pumping. We tested this hypothesis by measuring concentrations and d 13 C values of DIC, dissolved organic carbon (DOC), and particulate organic carbon (POC), along with radon ( 222 Rn, a natural submarine groundwater discharge tracer), in a tidal creek in Moreton Bay, Australia. Concentrations and d 13 C values displayed consistent tidal variations, and mirrored the trend in 222 Rn in summer and winter. DIC and DOC were exported from, and POC was imported to, the mangroves during all tidal cycles. The exported DOC had a similar d 13 C value in summer and winter (, 230%). The exported d 13 C-DIC showed no difference between summer and winter and had a d 13 C value slightly more enriched (, 222.5%) than the exported DOC. The imported POC had differing values in summer (, 216%) and winter (, 222%), reflecting a combination of seagrass and estuarine particulate organic matter (POM) in summer and most likely a dominance of estuarine POM in winter. A coupled 222 Rn and carbon model showed that 93-99% of the DIC and 89-92% of the DOC exports were driven by groundwater advection. DIC export averaged 3 g C m 22 d 21 and was an order of magnitude higher than DOC export, and similar to global estimates of the mangrove missing carbon (i.e., , 1.9-2.7 g C m 22 d 21 ).

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Section: Discussionmentioning

confidence: 99%

Groundwater‐derived dissolved inorganic and organic carbon exports from a mangrove tidal creek: The missing mangrove carbon sink?

Maher

Santos

Golsby-Smith

et al. 2013

Limnology & Oceanography

302

241

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“…The presence of crab burrows affects soil aeration, soil organic matter decomposition rates and material exchange between marshes and coastal waters (Minkoff et al 2006, Daleo et al 2007, Xin et al 2009). With the invasion of Spartina alterniflora more crabs and more burrows will possibly lead to changes in sediment dynamics of the Yangtze River estuarine marshes.…”

Section: Discussionmentioning

confidence: 99%

Effects of invasive cordgrass on crab distributions and diets in a Chinese salt marsh

Qin¹,

Chu²,

Wang³

et al. 2010

Mar. Ecol. Prog. Ser.

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The effects of invasive cordgrass Spartina alterniflora on burrowing crab communities in the salt marshes of the Yangtze River Estuary, China, were studied. Crab abundance, distribution and diets were compared in native Phragmites australis and invasive S. alterniflora stands. Spartinainvaded stands had 42% higher crab density than did native P. australis stands, largely because 2 dominant grapsoid crabs, Helice tientsinensis and Chiromantes dehaani, thrived in S. alterniflora stands. Sediment grain size, water content and vegetation stem height were the main factors correlated with crab distributions. Crab diet analyses revealed that crab stomach fullness was similar in stands of different plant species, indicating that in Spartina-invaded stands crabs can find compatible food quantity as in native plant stands. Both H. tientsinensis and C. dehaani from S. alterniflora stands had significantly higher δ 13 C values than those from P. australis stands, suggesting that the crabs consumed S. alterniflora in the invasive marshes. This non-selective feeding may be driving the success of H. tientsinensis and C. dehaani in invasive Spartina stands.

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“…Harvey et al, 1987;Hughes et al, 1998;Gardner and Porter, 2001;Xin et al, 2009). Gardner and Porter (2001) reported that marsh mud commonly overlies a sand layer in the southeastern United States.…”

Section: Y Q Xia and H L Li: A Combined Field And Modeling Studymentioning

confidence: 99%

A combined field and modeling study of groundwater flow in a tidal marsh

Xia

2012

Hydrol. Earth Syst. Sci.

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Abstract. Bald mud beaches were found among the mangrove marshes in Dongzhaigang National Nature Reserve, Hainan, China. To investigate the possible reasons for this phenomenon, the intertidal zones of a mangrove transect and a bald beach transect with similar topography and tidal actions were selected for comparison study. Along both transects, observed water table variations were significant in the high and low intertidal zones and negligible in the middle intertidal zones. Despite the same tidal actions and above-mentioned similarities, observed groundwater salinity was significantly smaller along the mangrove transect (average 23.0 ppt) than along the bald beach transect (average 28.5 ppt). These observations invite one hypothesis: the hydraulic structure of tidal marsh and freshwater availability may be the main hydrogeological factors critical to mangrove development. Two-dimensional numerical simulations corroborated the speculation and gave results in line with the observed water table. The two transects investigated were found to have a mud-sand two-layered structure: a surface zone of low-permeability mud and an underlying highpermeability zone that outcrops at the high and low tide lines. The freshwater recharge from inland is considerable along the mangrove transect but negligible along the bald beach transect. The high-permeability zone may provide opportunity for the plants in the mangrove marsh to uptake freshwater and oxygen through their roots extending downward into the high-permeability zone, which may help limit the buildup of salt in the root zone caused by evapotranspiration and enhance salt removal, which may further increase the production of marsh grasses and influence their spatial distribution. The bald beach is most probably due to the lack of enough freshwater for generating a brackish beach soil condition essential to mangrove growth. It is also indicated that seawater infiltrated the high-permeability zone through its outcrop near the high intertidal zone, and discharged from the tidal river bank in the vicinity of the low tide line. These processes thereby formed a tide-induced seawater-groundwater circulation, which likely provided considerable contribution to the total submarine groundwater discharge (SGD). Finally, implications and uncertainties behind this study were summarized for future examinations.

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Effects of crab burrows on pore water flows in salt marshes

Cited by 147 publications

References 32 publications

Groundwater‐derived dissolved inorganic and organic carbon exports from a mangrove tidal creek: The missing mangrove carbon sink?

Groundwater‐derived dissolved inorganic and organic carbon exports from a mangrove tidal creek: The missing mangrove carbon sink?

Effects of invasive cordgrass on crab distributions and diets in a Chinese salt marsh

A combined field and modeling study of groundwater flow in a tidal marsh

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