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

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 high-permeability 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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Responses of the mussel Brachidontes rodriguezii to aerial exposure: implications on growth and physiological condition

Canadian Journal of Zoology ◽

10.1139/cjz-2018-0173 ◽

2019 ◽

Vol 97 (7) ◽

pp. 612-618 ◽

Cited By ~ 2

Author(s):

María Eugenia Torroglosa ◽

Juliana Giménez

Keyword(s):

Shell Length ◽

Intertidal Zone ◽

Physiological Condition ◽

Physiological Stress ◽

High Tide ◽

Aerial Exposure ◽

Intertidal Zones ◽

The North ◽

Calcein Am ◽

High Intertidal Zone

The length of aerial exposure (i.e., environmental conditions) of an organism, due to daily tides, induces physiological responses. A mark–recapture field experiment was conducted in two intertidal zones (low tide and high tide) using the stain calcein AM to determine growth, as measured by shell length, of the mussel Brachidontes rodriguezii (d’Orbigny, 1842) along its vertical distribution off the north Argentinean coast. In the high intertidal zone, B. rodriguezii exhibited slower growth in shell length because of the physiological stress resulting from aerial exposure during low tides. In the low intertidal zone and during spring, B. rodriguezii exhibited faster growth in shell length. It is suggested that growth of B. rodriguezii relies on several environmental factors (temperature, photoperiod, and aerial exposure) that fluctuate according to tidal height.

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Quantitative analyses of decapod crustaceans at a rocky intertidal shore in the Gulf of Oman, Iran: diversity, zonation and monsoonal fluctuations

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315418000310 ◽

2018 ◽

Vol 99 (2) ◽

pp. 445-459

Author(s):

Saeed Ebrahimnezhad ◽

Reza Naderloo

Keyword(s):

Vertical Distribution ◽

Intertidal Zone ◽

New Records ◽

Decapod Crustaceans ◽

Intertidal Zones ◽

Gulf Of Oman ◽

South West ◽

South West Monsoon ◽

Significant Difference ◽

High Intertidal Zone

This paper provides data on diversity, zonation and seasonal fluctuations of decapod crustaceans at the northern Gulf of Oman coast, based on quantitative and qualitative samplings. A total of 75 species belonging to four infraorders, 27 families and 48 genera were identified. These species include 20 new records for the entire Gulf of Oman and 13 new records for its Iranian coast. The mid-intertidal zone showed a higher mean diversity and abundance than high- and low-intertidal zones. The mean diversity and abundance in the high-intertidal zone showed significant differences with the mid- and low-intertidal zones. The indices of species richness (Margalef), diversity (Shannon) and evenness (Pielou) showed significant differences among the intertidal zones. Most of the identified species (>60%) that had high values in their frequency of occurrence and relative abundance showed an overlapping vertical distribution, and were present in all three or just in two of the three defined zones. Other species were found only in one of the three zones (non-overlapping vertical distribution). The decapod community in the mid-intertidal zone showed a higher dissimilarity with the high-intertidal zone than with the low-intertidal. Both abundance and diversity were found to be lowest and highest during south-west and north-east monsoons, respectively. During south-west monsoon, the abundance of decapods declined dramatically, but species diversity and ecological indices did not show any statistically significant difference among the sampling periods.

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Littoral Stratification in Growth form and Fecundity of the Rock Barnacle, Semibalanus Balanoides

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315400028733 ◽

1988 ◽

Vol 68 (4) ◽

pp. 591-599 ◽

Cited By ~ 2

Author(s):

R. W. Rangeley ◽

M. L. H. Thomas

Keyword(s):

Intertidal Zone ◽

Growth Form ◽

Base Length ◽

Nucella Lapillus ◽

Semibalanus Balanoides ◽

Factors Affecting ◽

Intertidal Zones ◽

Density Dependent ◽

Low Incidence ◽

High Intertidal Zone

The population dynamics of rock barnacles, Semibalanus balanoides (L.), residing in low and high intertidal zones are affected by conspicuously different factors. The barnacle population in the high intertidal zone tends to show longterm stability due to a low incidence of both predation and interspecific competition. Wave exposure, desiccation and intraspecific competition are more important factors affecting abundance and size distribution in this zone (Menge, 1976). In the low intertidal zone, barnacle predation by the dogwhelk, Nucella lapillus (L.) is intense (Menge, 1976) and both the adults and larvae are smaller than in the high intertidal zone (Barnes, 1953). The growth form of S. balanoides is density dependent with taller, more columnar individuals predominating at high densities and short conical barnacles at low densities. Lower fecundity of conical individuals may be due to lower internal shell volume compared with columnar forms (Wethey, 1984). Fecundity increases both with increasing age and base length (Arnold, 1977) and is positively density dependent (Wethey, 1984).

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Diversity and first record of heterobranch gastropods (opisthobranchs) from the Saurashtra coast of Kathiawar Peninsula, India

Marine Biodiversity Records ◽

10.1017/s1755267215000585 ◽

2015 ◽

Vol 8 ◽

Cited By ~ 3

Author(s):

Paresh Poriya ◽

Bhavik Vakani ◽

Bhavendra Chaudhari ◽

Pradip Kachhiya ◽

Rahul Kundu

Keyword(s):

West Coast ◽

Intertidal Zone ◽

Arabian Sea ◽

New Records ◽

First Record ◽

The South ◽

Field Surveys ◽

Intertidal Zones ◽

West Coast Of India ◽

Saurashtra Coast

This paper reports seven species of opisthobranchs from the intertidal zone of the south Saurashtra coastline off the Arabian Sea, Kathiawar Peninsula, west coast of India. Field surveys were undertaken along the intertidal zones of south Saurashtra coast during 2012–2014. In this study, seven species belonging to six families were recorded, of whichHaminoea ovalis, Flabellina bicolor, Phidiana militaris, Baeolidia palythoaeandSakuraeolis gujaraticaare new records from this coastline.

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A new genus and species of polyclad flatworm found in the mantle cavities of gastropod molluscs in the high-intertidal zone of the Pacific coast of Central America

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315407055245 ◽

2007 ◽

Vol 87 (2) ◽

pp. 429-434 ◽

Cited By ~ 6

Author(s):

Anno Faubel ◽

Ronald Sluys ◽

David G. Reid

Keyword(s):

Central America ◽

Intertidal Zone ◽

New Genus ◽

Pacific Coast ◽

New Genus And Species ◽

Diagnostic Characters ◽

The Pacific ◽

Upper Eulittoral ◽

High Intertidal Zone ◽

Commensal Relationship

A commensal relationship is described between the polyclad flatworm Paraprostatum echinolittorinae Faubel & Sluys gen. et sp. nov. and gastropod molluscs living on the Pacific coast of central America. Although the worms are relatively large in comparison with their hosts, the latter sustained no apparent damage. Considering the fact that the molluscs live in the upper eulittoral zone and littoral fringe of the shore, it is unlikely that the polyclads could survive for long outside the hosts. Diagnostic characters for the new genus and species are a long penial stylet joined to the proximal vesicle and absence of Lang's vesicle. It is pointed out that Aprostatum clippertoni Bock, 1913 and A. longipenis (Kato, 1943) have been incorrectly transferred to the genus Euplana Girard, 1893 and that Discoplana malagensis Doignon, Artois & Deheyn, 2003 should be transferred to the genus Ilyella Faubel, 1983.

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Study of Bamboo Bandalling Structures in the Tidal River for River Bank Erosion

Lecture Notes in Civil Engineering - Proceedings of the Fourth International Conference in Ocean Engineering (ICOE2018) ◽

10.1007/978-981-13-3134-3_5 ◽

2018 ◽

pp. 49-57

Author(s):

Md. Lutfor Rahman

Keyword(s):

Bank Erosion ◽

Tidal River ◽

River Bank ◽

River Bank Erosion

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Geographical distribution and abundance of Ctenocheilocaris galvarini (Crustacea: Mystacocarida) along the coast of Chile

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315414000435 ◽

2014 ◽

Vol 94 (5) ◽

pp. 975-979

Author(s):

Matthew R. Lee ◽

Marcela Riveros

Keyword(s):

Geographical Distribution ◽

Water Table ◽

Intertidal Zone ◽

New Records ◽

Fine Sand ◽

Sandy Beaches ◽

Southern Chile ◽

Intertidal Sand ◽

Dry Sand

The mystacocarid Ctenocheilocaris galvarini is a member of the intertidal meiofauna in exposed sandy beaches along the coast of Chile. Originally described by Dahl (1952) from sub-tidal sediment off Isla Guafo, the only other published record is from semi-fine intertidal sand in Las Cruces. This paper presents a variety of new records of C. galvarini based on both quantitative and qualitative sampling of the coast of Chile between 18°S and 54°S. Ctenocheilocaris galvarini is found primarily in southern Chile, south of 32°, in the intertidal zone of intermediate beaches, in fine sand (Wentworth scale) most likely distributed between the level of the water-table and the surface, but avoiding dry sand.

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Seasonal occurrence of Japanese pygmy octopus Octopus parvus in the intertidal zone

10.1101/2021.03.14.435358 ◽

2021 ◽

Author(s):

Yuta Yamate ◽

Takumi Ohya ◽

Toshifumi Wada ◽

Takeshi Takegaki

Keyword(s):

Intertidal Zone ◽

Feeding Habits ◽

Gonadal Development ◽

Hermit Crabs ◽

Seasonal Occurrence ◽

Subtidal Zone ◽

Intertidal Zones ◽

Body Sizes ◽

Similar Body ◽

Traditional Fishing

AbstractThe Japanese pygmy octopus Octopus parvus is a small octopus that occurs commonly along the coast of southern Japan, and is caught using traditional fishing methods. To date, however, there have been no studies on the ecology of this species. In this study, we investigated the annual seasonal occurrence of O. parvus in the intertidal zone of Fukue Island, Nagasaki, Japan, and examined the growth, maturation, and feeding habits of this octopus. We accordingly found that the octopus inhabits the intertidal zone of the study site from August to January, during which time it appears to move from the high to low intertidal zone, and subsequently migrates to the subtidal zone. During low tide at night in the intertidal zone, we observed that the octopuses actively captured and fed on prey, such as fish, crabs, hermit crabs, shrimp, snails, and bivalves. Both males and females were found to be characterized by similar body sizes and growth, although gonadal development occurs relatively earlier in males. However, any mating or brooding behaviors were not observed during the course of the study. Our observations thus indicate that O. parvus uses intertidal zones as feeding grounds for rapid growth and maturation, and may thereafter move to the subtidal zone for spawning.

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Recharge of River Water to Karst Aquifer Determined by Hydrogeochemistry and Stable Isotopes

Water ◽

10.3390/w11030479 ◽

2019 ◽

Vol 11 (3) ◽

pp. 479 ◽

Cited By ~ 2

Author(s):

Yi Guo ◽

Dajun Qin ◽

Jie Sun ◽

Lu Li ◽

Fulin Li ◽

...

Keyword(s):

River Water ◽

Preferential Flow ◽

Karst Aquifer ◽

Water Type ◽

Karst Groundwater ◽

River Bank ◽

Field Investigations ◽

Groundwater Samples ◽

Spring System ◽

Preferential Flow Path

The Jinan Karst Spring System in Shandong province, China, has suffered to maintain groundwater level and spring flowing for decades. Recharge of river water to karst aquifer in Jinan is important for the outflowing of four large karst springs in the city center. Field investigations were conducted for two times in May and October, 2015, respectively and water samples were collected for hydrogeochemical and isotopic measurements. Results showed that (a) the water type was predominantly Ca-HCO3-SO4 for karst groundwater, and Ca-Mg-SO4 for river water; (b) the concentration of HCO3− and NO3− in karst groundwater were higher than that in river water, in contrast, the concentration of SO42− and K+ in karst groundwater were lower than that in river water; (c) the δ2H and δ18O values with average of −51.2‰ and −6.6‰ for river water is more enriched than the values in groundwater samples (−59.1‰ and −8.3‰), in that river experienced evaporation in the upstream reservoir; (d) Based on the distribution pattern of δ18O, groundwater near river bank was found to be recharged from river water and found a preferential flow path in karst aquifer situated from Dongkema to Manzizhuang near the river bank. This study provides useful information for understanding of the hydraulic connection between river water and karst aquifer, and benefit the protection and management of water resources.

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