How much can the occurrence and coverage of charophytes in an estuarine lagoon (Curonian Lagoon) be explained by environmental factors?

Bučas, Martynas; Sinkevičienė, Zofija; Kataržytė, Marija; Vaičiūtė, Diana; Petkuvienė, Jolita; Stragauskaitė, Vaiva; Ilginė, Raimonda

doi:10.1016/j.ecss.2018.01.017

Cited by 17 publications

(27 citation statements)

References 45 publications

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“…Deposition occurred during occasional flooding by baffling and sediment entrapment (Nyman et al, 1993;Dashtgard & Gingras, 2005). Rare charophytes in F3 may be suggestive of brackish water, possibly similar to coastal settings with charophytes in the Baltic Sea (Steinhardt et al, 2009;Bu cas et al, 2019). Lime mudstone with desiccation cracks (F9) likely records upper intertidal flat deposition along channel margins adjacent to marsh systems.…”

Section: Discussionmentioning

confidence: 98%

Mixed carbonate–siliciclastic tidal sedimentation in the Miocene to Pliocene Bouse Formation, palaeo‐Gulf of California

et al. 2021

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Mixed carbonate-siliciclastic deposits provide unique insights into hydrodynamic processes that control sedimentation in tidal systems. This study presents sedimentological and ichnological data from the upper Miocene to lower Pliocene Bouse Formation, which accumulated during regional transgression at the margin of a tidal strait near the north end of the ancestral Gulf of California. The basal carbonate member of the Bouse Formation records deposition in a tide-influenced, compositionally mixed carbonate-siliciclastic system dominated by salt marsh, tidal flat and channel environments. The basal carbonate member is an overall deepening up succession of facies associations comprising: Facies Association 1siliciclastic-rich heterolithic facies, lime mudstone with desiccation cracks, and plant debris rich carbonate silt interpreted as siliciclastic-rich tidal flats; Facies Association 2well-sorted gravels, siliciclastic-rich sandy strata, lime mudstone with desiccation cracks, and sandy microbial micrite interpreted as tidal-channel deposits; Facies Association 3carbonate-rich heterolithic lime mudstone to well-sorted, cross-bedded bioclastic grainstone interpreted as intertidal to shallow subtidal deposits; and Facies Association 4lime mudstone interpreted as shallow to deep subtidal low-energy deposits that record the end of tidal conditions in the basin. Trace fossils include marine forms Gyrolithes, Teichichnus and Thalassinoides, and non-diagnostic forms Arenicolites, Cochlichnus, Conichnus, Lockeia, Planolites, Skolithos and Treptichnus (known from marine, brackish and freshwater environments). The diminutive size of trace fossils reflects brackish conditions created by mixing of freshwater and seawater. This study provides evidence for a late Miocene to early Pliocene humid climate in southwestern North America, in stark contrast to the modern hyperarid climate. Factors that controlled the relative percentage of mixed carbonate and siliciclastic sediment include siliciclastic input from local rivers, in situ carbonate production, current energy, degree of tidal mixing and relative sea level. Pronounced facies variability at bedform, outcrop and basin scale documented in this study appears to be an important characteristic of mixed carbonate-siliciclastic deposits in tidal depositional systems.

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Section: Discussionmentioning

confidence: 98%

Mixed carbonate–siliciclastic tidal sedimentation in the Miocene to Pliocene Bouse Formation, palaeo‐Gulf of California

et al. 2021

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“…The complex interbedding of alluvial‐fan facies and intertidal flat deposits provides evidence for deposition at the toes of alluvial fans adjacent to a tidally influenced marine embayment. Although charophytes are widely attributed to freshwater environments, they are also well‐documented in modern coastal waters and brackish saline lagoons of the Baltic Sea, Adriatic Sea and coastal Scotland (Blindow, 2000; Martin et al ., 2002; Zeneli & Kashta, 2016, Bučas et al ., 2019). The presence of laterally discontinuous layers of charophytes along some bedding plane surfaces in carbonate‐dominant facies composed of marine skeletal fragments, with diminutive Thalassinoides as indicators of a stressed environment, suggests a brackish water environment consistent with freshwater input from alluvial feeder systems to a carbonate‐rich marginal marine environment (Dalrymple & Choi, 2007; O’Connell et al ., 2020).…”

Section: Facies Associationsmentioning

confidence: 99%

Mixed carbonate–siliciclastic sedimentation at the margin of a late Miocene tidal strait, lower Colorado River Valley, south‐western USA

Gardner

Dorsey

2021

Sedimentology

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The processes and deposits of tide-dominated river deltas and estuaries are well-understood, but the sedimentary dynamics of tide-dominated straits and seaways are relatively little studied. Although recent depositional models have started to fill this gap, many aspects of tidal strait sedimentation such as interaction with strait-margin alluvial fans and marginal marine systems remain poorly understood. This paper presents a study of the late Miocene basal carbonate member of the Bouse Formation exposed along the lower Colorado River, where prior studies have suggested a tidal influence on deposition. This study explores the applicability of tidal strait models in a continental oblique-rift setting, and tests hypotheses for depositional processes and environments through detailed analysis of sedimentary facies, cross-bedding architecture and palaeocurrent data. Mixed carbonate-siliciclastic facies on the west margin of the southern Blythe Basin record sedimentation in alluvial fans and fan-fringing tidal flats at the retreating margin of a transgressive tidal strait. Pre-Bouse normal faults established a narrow, tectonically confined basin architecture that led to amplification of tidal currents. Basin-margin deposits pass laterally and up-section into high-energy cross-bedded grainstone facies that record southward migration of compound dunes in the dune-bedded strait zone of a shallow (ca 25 m) tidal strait. These findings provide the basis for recognition of strait-margin facies in other settings where complex facies associations result from along-strike variations in palaeobathymetry and current velocity. The results support a tidal origin for the southern Bouse Formation and provide new evidence for post-Miocene uplift of the lower Colorado River Valley and adjacent areas.

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“…ex Steud., cattail Typha spp., or lakeshore bulrush Schoenoplectus lacustris (L.). Scattered patches of submerged vegetation which is resistant to wave action occur up to the depth of approximately 1.5-2.0 m and consist mainly of the perfoliate pondweed Potamogeton perfoliatus L. and sago pondweed Stuckenia pectinata (L.) Börner (Gasiunaite et al 2008;Kornijów 2018;Bucas et al 2019;Pawlikowski and Komijów 2019). The climate in the south-eastern part of the Baltic Sea, where CL and VL are located, is transitional, from moderate marine to moderate continental.…”

Section: Study Areamentioning

confidence: 99%

Feeding by two closely related species of Chironomus (Diptera: Chironomidae) in south Baltic lagoons, with implications for competitive interactions and resource partitioning

2019

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Four major categories of food items were determined in the gut content of chironomid larvae collected in the Curonian and Vistula Lagoons in the spring-summer period of 2009-2011. These were detritus (range from 88 to 92% of the gut content, by volume), matter of plant (2-7%) and animal origin (0.2-0.5%), and mineral particles (3-7%). Plant matter comprised pine pollen, conidia of fungi, cyanobacteria, green algae and diatoms. Matter of animal origin consisted of remnants of oligochaetes and rotifers. Food content was more diverse in the larvae inhabiting the Curonian Lagoon. The size of mineral particles in gut contents was significantly higher in C. balatonicus, although the distance between the bases of the maxillas, as a predictor of the size of the particles being eaten, was larger in C. plumosus. The gut content analysis suggested lack of clear food selectivity which potentially may lead to interspecific competition for food. However, the strength of interaction can be substantially weakened by several factors: (1) exceptionally favourable food conditions for benthic chironomids in both highly eutrophic lagoons, (2) the ability to occupy areas differing in salinity, (3) different feeding behaviour and (4) the ability to swallow particles of different size spectra.

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How much can the occurrence and coverage of charophytes in an estuarine lagoon (Curonian Lagoon) be explained by environmental factors?

Cited by 17 publications

References 45 publications

Mixed carbonate–siliciclastic tidal sedimentation in the Miocene to Pliocene Bouse Formation, palaeo‐Gulf of California

Mixed carbonate–siliciclastic tidal sedimentation in the Miocene to Pliocene Bouse Formation, palaeo‐Gulf of California

Mixed carbonate–siliciclastic sedimentation at the margin of a late Miocene tidal strait, lower Colorado River Valley, south‐western USA

Feeding by two closely related species of Chironomus (Diptera: Chironomidae) in south Baltic lagoons, with implications for competitive interactions and resource partitioning

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