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An Entzia-dominated marsh-type agglutinated foraminiferal assemblage from a salt marsh in Tubli Bay, Bahrain

100%

Kaminski M. A. , Amao A. O. , Garrison T. F. , Fiorini F. , Magliveras S. , Tawabini B. S. , Waśkowska A.

Geology, Geophysics and Environment

2020

tom Vol. 46, no. 3

189--204

A salt-marsh assemblage of agglutinated foraminifera was recovered from a salt marsh on the east side of Tubli Bay in eastern Bahrain. This locality is one of the last remaining patches of salt marsh on the east coast of Tubli Bay. The salt marsh is covered by a single marsh plant species, Arthrocnemum macrostachyum. Samples were collected from beneath the Arthrocnemum canopy in two transects beginning at the maximum landward extent of halophytic plants in the high marsh and extending to a tidal channel at the seaward side of the low marsh. A distinct elevation-related zonation in foraminifera is observed from the high marsh to the low marsh. The trochamminids Entzia macrescens and Trochammina inflata are characteristic of the high marsh, whereas Ammonia, Elphidium, Peneroplis and smaller miliolids become common in the middle part of the marsh transect. The tidal channel at the lower limit of the marsh contains an assemblage dominated by Ammonia, Elphidium, adult specimens of Peneroplis, and smaller miliolids, with Clavulina and Agglutinella as the only agglutinated taxa. Living specimens of Entzia and Trochammina were observed during the winter 2019–2020 sampling season, whereas samples collected in Autumn 2019 contained only dead specimens. One new species, ?Sigmoilina canisdementis sp. nov., is described herein. This is the first report of a live Entzia-dominated salt marsh assemblage in the Arabian Gulf region.

Testate amoebae as sea-level indicators in Northwestern Norway: developments in sample preparation and analysis

63%

Barnett R. L. , Charman D. J. , Gehrels W. R. , Saher M. H. , Marshall W. A.

nr 3

Relationships between vegetation zonation and edaphic factors in a salt-marsh community [Black Sea Coast]

63%

Apaydin Z. , Kutbay H. G. , Ozbucak T. , Yalcin E. , Bilgin A.

nr 1

99-112

The effects of pH, electrical conductivity (EC), soluble cations (Na⁺, K⁺, Ca²⁺, Mg²⁺), and soluble anions (HCO₃⁻, Cl⁻, SO₄²⁻) on vegetation zonation in a salt-marsh community (Black Sea coast) were investigated on two localities at Black Sea Coast differing as to the altitude, community composition and zonation. Three zones (25–80 m wide) – lower, middle and upper were distinguished in each locality along 150 m transect and according to the vegetation types which were analysed with Braun-Blanquet method. The dominant species were following: Juncus acutus L., Salicornia prostrata Pall., Spergularia marina (L.) Gris, Hordeum geniculatum All., Plantago coronopus L. subsp. coronopus, Carex capitellata Boiss. and Bal, Artemisia santonicum L. and Juncus littoralis C. A. Mey. Soil samples were taken down to 50 cm. The results of soil analysis were evaluated by using Canonical Correspondence Analysis (CCA) from winter 1999 to autumn 2000. HCO₃⁻ concentration and inundation depth (2.22–21.44 cm) are the environmental variables that correlate the best with axis 1, whereas K⁺ concentration and inundation depth (2.22–21.44 cm) correlate the best with axis 2 during the study period. During winter 1999, HCO₃⁻ concentration showed the highest correlation with the canonical axis 1 and associated zone was H. geniculatum. In spring, summer and autumn 2000, inundation depth (3.44–19.11 cm) was the most prominent factor correlated with the first and second axes, respectively, with associated zone of C. capitellata. EC, Na⁺ and Cl⁻ concentrations were decreased during autumn in all vegetation zones except for C. capitellata and Artemisia santonicum zones in which Na⁺ and Cl⁻ concentrations and EC, respectively were increased during autumn. The C. capitellata (Cyperaceae) zone was located on the positive site of axis 1 during autumn 2000 and followed the gradient of inundation depth. S. prostrata, S. marina, H. geniculatum and P. coronopus subsp. coronopus seems to be adapted to the most saline soils, whereas C.capitellata indicates the wettest soils in the studied salt marsh. The Juncus littoralis zone followed the gradient of maximum salinity during autumn of the year 2000, but the zone was not related to the measured increase in soil salinity during winter, summer and spring. In both localities EC, Na⁺ and Cl⁻ concentrations were tended to decrease at upper zones. Inundation regime, K⁺ concentration, and HCO₃⁻ concentration are key factors affecting vegetation zonation in studied salt marshes.

Life strategies in salt marsh communities of the East Frisian North Sea Coast [North-Western Germany]

63%

Hensen I.

Fragmenta Floristica et Geobotanica

1998

tom 43

nr 2