Interception of nutrient rich submarine groundwater discharge seepage on European temperate beaches by the acoel flatworm, Symsagittifera roscoffensis

Carvalho, Liliana; Rocha, Carlos; Fleming, Alexandra; Veiga-Pires, C.; Aníbal, J.

doi:10.1016/j.marpolbul.2013.07.045

Cited by 25 publications

(15 citation statements)

References 38 publications

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“…The active uptake of nitrates by S. roscoffensis adults depending on light availability (10 times higher than that of its symbiont alone) (Carvalho et al, 2013 ) is in agreement with primary productivity by coral zooxanthellae which is about an order of magnitude higher than that of free-living phytoplankton on reefs (Muscatine, 1980 ). S. roscoffensis is thought to be involved in the uptake of nutrient rich submarine groundwater discharge seepage, in other words may be a possible nitrate recycler (Carvalho et al, 2013 ).…”

Section: The Biology Of S Roscoffensismentioning

confidence: 61%

The chimerical and multifaceted marine acoel Symsagittifera roscoffensis: from photosymbiosis to brain regeneration

et al. 2014

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A remarkable example of biological engineering is the capability of some marine animals to take advantage of photosynthesis by hosting symbiotic algae. This capacity, referred to as photosymbiosis, is based on structural and functional complexes that involve two distantly unrelated organisms. These stable photosymbiotic associations between metazoans and photosynthetic protists play fundamental roles in marine ecology as exemplified by reef communities and their vulnerability to global changes threats. Here we introduce a photosymbiotic tidal acoel flatworm, Symsagittifera roscoffensis, and its obligatory green algal photosymbiont, Tetraselmis convolutae (Lack of the algal partner invariably results in acoel lethality emphasizing the mandatory nature of the photosymbiotic algae for the animal's survival). Together they form a composite photosymbiotic unit, which can be reared in controlled conditions that provide easy access to key life-cycle events ranging from early embryogenesis through the induction of photosymbiosis in aposymbiotic juveniles to the emergence of a functional “solar-powered” mature stage. Since it is possible to grow both algae and host under precisely controlled culture conditions, it is now possible to design a range of new experimental protocols that address the mechanisms and evolution of photosymbiosis. S. roscoffensis thus represents an emerging model system with experimental advantages that complement those of other photosymbiotic species, in particular corals. The basal taxonomic position of S. roscoffensis (and acoels in general) also makes it a relevant model for evolutionary studies of development, stem cell biology and regeneration. Finally, it's autotrophic lifestyle and lack of calcification make S. roscoffensis a favorable system to study the role of symbiosis in the response of marine organisms to climate change (e.g., ocean warming and acidification). In this article we summarize the state of knowledge of the biology of S. roscoffensis and its algal partner from studies dating back over a century, and provide an overview of ongoing research efforts that take advantage of this unique system.

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Section: The Biology Of S Roscoffensismentioning

confidence: 61%

The chimerical and multifaceted marine acoel Symsagittifera roscoffensis: from photosymbiosis to brain regeneration

et al. 2014

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“…The links are weakly documented by, for example, temple positions, as seen in Bangkok (Burnett et al, 2009) or on Lombok, Indonesia (Tanah Lot temple: Lubis and Bakti, 2013). Other indications of the cultural importance of submarine springs are place names related to water, such as Olhos de Aqua in Portugal (Carvalho et al, 2013) and local legends, such as the crying Tjilbruke spirit in South Australia (Isaacs, 1979). Because submarine springs are not usually the focus of people researching cultural heritage, little effort has been put into following these links in a structured way.…”

Section: Cultural Aspectsmentioning

confidence: 99%

Submarine Groundwater Discharge: Updates on Its Measurement Techniques, Geophysical Drivers, Magnitudes, and Effects

Taniguchi

Dulai

Burnett

et al. 2019

Front. Environ. Sci.

196

143

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The number of studies concerning Submarine Groundwater Discharge (SGD) grew quickly as we entered the twenty-first century. Many hydrological and oceanographic processes that drive and influence SGD were identified and characterized during this period. These processes included tidal effects on SGD, water and solute fluxes, biogeochemical transformations through the subterranean estuary, and material transport via SGD from land to sea. Here we compile and summarize the significant progress in SGD assessment methodologies, considering both the terrestrial and marine driving forces, and local as well as global evaluations of groundwater discharge with an emphasis on investigations published over the past decade. Our treatment presents the state-of-the-art progress of SGD studies from geophysical, geochemical, bio-ecological, economic, and cultural perspectives. We identify and summarize remaining research questions, make recommendations for future research directions, and discuss potential future challenges, including impacts of climate change on SGD and improved estimates of the global magnitude of SGD.

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“…The benthic community at intertidal seepage faces has been identified as capable of significant modulation of dissolved inorganic nitrogen (DIN) loads to the receiving waters (Kroeger and Charette 2008;Rocha et al 2009;Ib anhez et al 2011Ib anhez et al , 2013Carvalho et al 2013). Nevertheless, the expected attenuation of loads to the receiving waters within the seepage face by heterotrophic denitrification may not be presumed certain, as other pathways reducing may take place locally (Bowen et al 2007;Kroeger and Charette 2008;Rocha et al 2009).…”

Section: Implications For Dissolved Inorganic Nitrogen Processing At mentioning

confidence: 99%

Oxygen transport and reactivity within a sandy seepage face in a mesotidal lagoon (Ria Formosa, Southwestern Iberia)

Ibánhez

Rocha

2015

Limnol. Oceanogr.

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Sandy sediments are now recognized as sites of high carbon turnover enhanced by porewater flow. However, it is unclear how coupling between porewater advection and benthic metabolism might permit O2‐saturated areas and suboxic environments to coexist in close proximity. Field sampling campaigns, flow‐through reactor (FTR) experiments and diagenetic modeling were used to study benthic O2 dynamics in surface sediments of a permeable intertidal seepage face (Ria Formosa; Southwestern Iberia). Field results demonstrated that the pressure gradient imposed by tidal oscillation at the seepage face permits seawater infiltration at high tide, and hence resupplies the benthos in O2 and organic matter (OM). Significant aerobic respiration rates (12.1–26.8 nmol cm−3 “bulk sediment” (bs) h−1) were derived from vertical O2 gradients taken from the top 28 cm of the sediment during active seepage. FTR experiments showed a vertical zonation of respiration rates following benthic OM availability (from 8.63 ± 1.88 nmol cm−3 bs h−1 at 12–32 cm depth to 53.55 ± 7.93 nmol cm−3 bs h−1 at 0–2 cm depth). Advection enhances O2 consumption rates, but respiration is ultimately limited by OM availability at high seepage rates. Diagenetic modeling of O2 distribution in the porewater suggests that even within a well‐oxygenated beach aquifer, local respiration is sufficiently high to lower the porewater O2 concentration near the sediment surface during active seepage. Our results indicate that high seepage rates, OM and O2 loading promoted by tidally‐driven seawater infiltration control the O2 consumption at the sediment surface, thus favoring the occurrence of suboxic biogeochemical processes near the sediment surface.

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Interception of nutrient rich submarine groundwater discharge seepage on European temperate beaches by the acoel flatworm, Symsagittifera roscoffensis

Cited by 25 publications

References 38 publications

The chimerical and multifaceted marine acoel Symsagittifera roscoffensis: from photosymbiosis to brain regeneration

The chimerical and multifaceted marine acoel Symsagittifera roscoffensis: from photosymbiosis to brain regeneration

Submarine Groundwater Discharge: Updates on Its Measurement Techniques, Geophysical Drivers, Magnitudes, and Effects

Oxygen transport and reactivity within a sandy seepage face in a mesotidal lagoon (Ria Formosa, Southwestern Iberia)

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