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Dead foraminiferal abundance (%) of seven foraminiferal species and foraminiferal populations of the mangroves of Kaledupa Transect B. The elevation, tidal levels (mean high high water (MHHW), mean low high water (MLHW) and mean high low water (MHLW) and mean low low water (MLLW) and floral zonation are indicated.
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We collected modern foraminiferal samples to characterize the foraminiferal environments and investigate the role that temporal
and spatial variability may play in controlling the nature and significance of foraminiferal assemblages of the mangroves
of Kaledupa, Wakatobi Marine National Park, Southeast Sulawesi, Indonesia. The study of foraminifera...
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Context 1
... A2, A1 and B) are likely to have come from the same two underlying populations and thus assess temporal and spatial influences. Values in bold exceed the p 0.05 significance value (2.09) and in- dicate rejection of the null hypothesis that the A1 and A2, and A1 and B are equal. ble among the original (A1), temporal (A2) (Fig. 6) and spatial (B) (Fig. 7) transects. The total number of dead fo- raminifera is also relatively constant; 3712 on A1, 3708 on A2 and 3955 specimens on B. Statistical analyses do not show any significant differences although there are note- worthy differences at individual stations (Table 1). For ex- ample, the relative contribution of A. mexicana fluctuates ...
Citations
... The authors reported dominance of taxa including Ammonia spp., Ammotium salsum, Entzia macrescens, Quinqueloculina sp. Horton et al. (2005) studied the intertidal vegetated and mudflat regions in Kaledupa mangroves of Indonesia and observed high abundance of taxa representing Trochammina inflata, Ammonia tepida, Elphidium advenum and Quinqueloculina spp. Eichler et al. (2007) studied modern foraminiferal assemblages in a subtropical estuarine channel of Bertioga, São Paulo in Brazil and showed that one of the facies include Ammonia beccarii, Elphidium excavatum, Trochammina inflata and Trochammina sp., and other one constitutes of Bolivina sp., Ammoastuta salsa, and Trochammina sp., all of which are typical signatures of mangrove fringes. ...
Benthic foraminifera assemblages, nutrient dynamics of surface and porewater from 10 intertidal sites spanning over two years (2019-2020) covering two major estuaries in Sundarbans mangrove were evaluated to understand role of seasonal precipitation and primary production (driven by eddy nutrients) with a focus on standing crop. Benthic foraminifera abundance ranged between 280 individuals/10 cc in pre-monsoon (2019), 415 individuals/10 cc in post-monsoon 2019 and 630 individuals/10 cc in post-monsoon (2020). Standing crop was highest in post-monsoon coinciding with eddy nutrients driven stoichiometry and increase in abundance of large diatom cells. Calcareous and agglutinated foraminifer taxa Ammonia sp.1, Quinqueloculina seminulum, Entzia macrescens and Textularia sp. respectively were frequent. Entzia macrescens was found in dense mangrove vegetation sites; exhibited strong relationship with sediment texture and pore water total organic carbon. One of the major findings is mangroves with pneumatophores improves oxygen availability in sediment and leads to an increase in standing crop.
... Eichler et al., 2008;Hromic, 2009;HROMIC et al., 2006) but also live in intertidal and brackish coastal environments (e.g. Eichler et al., 1995;Horton et al., 2005;Pascual et al., 2019). They are epibenthic species that tend to live on a wide range of firm substrates rather than in the interstices of the sediments (Alexander and Delaca, 1987;Abu-Zied et al., 2016). ...
The present study aims to analyze the composition and distribution of the intertidal foraminiferal assemblages of the Mar Chiquita Coastal Lagoon (southeast coast of Buenos Aires Province). For this purpose, the abundance and diversity of the living and dead fauna were determined; the taphonomic features of the tests were analyzed; and physico-chemical measurements were taken at 10 sites of the lagoon. The assemblages were constituted mainly by autochthonous fauna. The sediment grain size and salinity are the main variables that determine the distribution of species and discerned three assemblages, associated with three sub-environments. The first sub-environment of coarse sediment and mesohaline waters corresponds to non-vegetated plains in the mouth of the lagoon. It contains Buccella peruviana, Elphidium discoidale, and Quinqueloculina patagonica. The second sub-environment of fine sediment and mesohaline waters corresponds to non-vegetated plains in the inlet of the lagoon. It includes Elphidium gunteri, B. peruviana, Ammonia parkinsoniana, Ammonia tepida, Miliolinella subrotunda, Rosalina williamsoni, Pyrgo ringens, Discorbis peruvianus, and Q. patagonica. The third sub-environment of coarse sediment - waters ranging from polyhaline to mixoeuhaline and fine sediment - oligohaline waters corresponds to vegetated and non-vegetated plains and floodplains far from the mouth of the lagoon. It contains Ammonia spp, and E. gunteri.
... The present study only lists the benthic foraminifera sampled from mangrove environment, excluding the one from the lagoon or brackish habitats. Indeed, worldwide mangrove locations with available benthic foraminiferal data (Table S3) were then selected for comparison (i.e., Debenay and Para 2004;Hayward et al. 2004;Horton et al. 2005;Kawagata et al. 2005;Debenay and Luan 2006;Langer and Lipps 2006;Perry et al. 2008;Wilson et al. 2008;Berkeley et al. 2009;Semensatto-Jr. et al. 2009;Rajeshwara Rao et al. 2012;Gómez and Bernal 2013;Mooraki et al. 2013;Ghosh et al. 2014;Vidya and Patil 2014;Debenay et al. 2015;Sen et al. 2015;Jeyabal et al. 2016;Langer et al. 2016;Sen et al. 2018;Tripathi et al. 2018). ...
Mangroves are one of the most productive ecosystems worldwide and provide numerous ecosystem services. This biome hosts nursery habitats and supports a diverse range of organisms including microfauna such as benthic foraminifera. This study integrates all the available information on benthic foraminifera from Malaysian mangroves, with special reference to Penang Island mangrove forests to evaluate the overall diversity and compare with the worldwide mangrove’s records. This new compilation reveals 223 benthic foraminiferal species representing 116 genera, 57 families, and nine orders, of which only 48 species have been identified in Malaysian mangroves. These values are relatively higher than the previous records of benthic foraminifera from worldwide mangrove areas, however, are comparatively lower than other both shallow and deep-water environments. The results provide new insight into benthic foraminiferal diversity in mangroves and can be used as baseline data for monitoring and implementing conservation and restoration plans.
... 0.393 0.683 -and present only in uppermost centimeter. This pattern has already been observed for calcareous foraminifera and associated with the postmortem dissolution of the test (Culver and Horton, 2005;Horton et al., 2005;Horton and Murray, 2006). Also, laboratory experiments have demonstrated that A. tepida is negatively geotaxis, i.e., it does not use gravity to orientate (Seuront and Bouchet, 2015), and that its locomotion speed is related to the presence of organic matter (Jauffrais et al., 2016). ...
Sampling strategies and methodological procedures are a theme of discussion in all areas of Science, considering their potential impacts on results, interpretations, and conclusions. In the case of ecological studies based on recent foraminifera, most of papers vary on collecting single samples or replicates, on counting living and/or dead assemblages, and on the depth of the sediment layer collected. In this study we discussed the implications of the following questions, especially in the intertidal zone of a tropical estuary: (i) Do collecting a single sample or replicates affect results and interpretations? (ii) Are there differences in results and interpretations generated from counting living (stained) or dead assemblages?; and (iii) Do varying the sampling depth of sediment layers influence the results and interpretations? We defined three collection points along the mangrove margins associated to the Itapanhaú River (Bertioga, State of São Paulo, Brazil). In each point, we drilled three microcores with the depth of 20 cm, laterally distant 30 cm from each other. In each microcore sediment samples (3 mL) were extracted in the layer intervals of 0–1, 4–5, 9–10, 14–15, and 19–20 cm. Foraminifera from all the samples were compared regarding absolute abundances, species composition, diversity, evenness and, communities similarities. We observed that replicates produce better results than single samples, both for the living and dead assemblages. Pseudoreplication simulation produced divergent results. Replicates make possible the application of more accurate inferential statistical analysis because the spatial variations of the species are captured. There were significant differences in ecological indicators and respective interpretations between analyzes based on counting living and dead assemblages so that they should not be considered directly comparable to each other. Counting living foraminifera requires higher effort for collecting and picking tests to reach the statistical minimum recommended. Regarding sampling depth, the first centimeter seems to be sufficient to find the vast majority of living foraminifera, mainly to estimate species richness. However, thicker sediments result in a longer time interval integrated into the sample, so the time-scale and variables that control foraminifera may change for interpretation. Our findings are consistent with previous studies carried out in subtropical estuaries, also expanding methodological recommendations to tropical estuaries. Future studies should explore the best distances among replicates.
... They are frequent species in Portuguese estuarine saltmarshes, where they tolerate extreme adverse conditions at the limit of their environmental tolerance . Entzia macrescens, for instance, is a good indicator for middle and high marshes where this species can dominate foraminiferal assemblages (de Rijk and Troelstra, 1997;Horton et al., 2005;Armynot du Châtelet et al., 2009, since it is one of the most tolerant species to subaerial exposure Medioli, 1978, 1980). Trochamminita irregularis is common at transitional environemnts from the lower to the upper saltmarsh where it can dominate the living assemblage of foraminifera (up to 97%; Lübbers and Schönfeld 2018). ...
This work is based on a compilation of benthic foraminiferal data collected in the Aveiro Lagoon and in the adjacent continental shelf and upper slope (center of Portugal). It intends to provide an overall analysis from transitional to the outer continental shelf of the occurrence and distribution of species in living and to present updated taxonomic data and illustrations of most of the species found in the in the Aveiro Lagoon and in the adjacent continental shelf including in total assemblages. Correspondence analysis (CA) and Principal Components Analysis (PCA) interpreted as depth functions allow us to identify the main species in different ecoenvironments and sectors of the study area. The most unusual living assemblage was documented in the lagoon inlet under very strong tidal currents activity, composed mostly by the following species (both in living and total assemblages): Rotaliammina concava, Lepidodeuterammina ochracea, Quinqueloculina seminula, Gavelinopsis praegeri, Paratrochammina haynesi, Remaneica helgolandica and Remaneicella gonzalezi. The distribution patterns of some Trochamminidae and Remaneicidae species whose ecology and distribution pattern are poorly known, have proved to be a marker of more or less hydrodynamic and stable/unstable environments in coastal and transitional marine environments.
... Foraminiferal assemblage from Australian mangroves was investigated by Horton et al. (2003) and they observed the species diversity to be similar to temporal marsh environments with similar zonation. Horton et al. (2005) noted similar trends while documenting the foraminiferal assemblage from Wakatobi Marine National Park, South East Sulawesi mangroves in Indonesia. Murray (2006) has summarized this global trend by stating "In general species diversity is low in extreme environments (brackish, hypersaline marshes, lagoons and estuaries) but ranges a little higher in normal marine lagoons". ...
... In the present investigation the abundance of live foraminiferal tests was extremely low (0-2 %) and was represented by the calcareous taxon Ammonia and agglutinated Trochammina sp. and Entzia macrescens. Previous investigations of foraminiferal diversity from mangrove environments have also found them to be characterized by a low diversity assemblage dominated mostly by agglutinated forms (Culver et al. 1990;Horton et al. 2003;Horton et al. 2005;Langer and Lipps 2006). Culver et al. (1990) studied the Puerto Rican Mangrove-Lagoon systems near La Parguera and Playa Salinas and observed the foraminiferal assemblage to be dominated by agglutinated forms such as Trochammina sp., Ammobaculites dilatatus, Cribrostomoides salsus, Glomospira gordialis, Gaudryina exilis and Trochammina globigeriformis. ...
Modern benthic foraminiferal assemblages are instrumental in providing information regarding changes in relative sea level as well as prevailing environmental conditions in marine environments. Marginal marine environments are coastal environments that are in most cases characterized by high influx of terrestrially originated nutrients. Inventorizing of modern benthic foraminiferal assemblages from such habitats can act as biotic indicators of water quality variations along with any changes in relative sea level. The present study documents the modern benthic foraminiferal assemblage from three
major marginal marine habitats located along the North West coast of Bay of Bengal, in the Indian Ocean. Sediment samples for the purpose were thus collected from the Indian Sundarbans Delta, Chilika lagoon and the Gautami Godavari estuarine zone which encompasses the Kakinada bay. A total of 32 species of benthic foraminifera were documented during the study. The present observations were compared with previous reports of benthic foraminiferal diversity from these habitats and exhibited variability.
... The distribution of intertidal foraminifera is relatively well known, with at least two foraminiferal zones typically described: an upper part (middle/high marsh or mangrove) colonized exclusively by agglutinated assemblages, and a lower part (low marsh/ mangrove/mudflats) characterized by mixed calcareous/agglutinated assemblages (Horton, 1999;Horton et al., 2005;Berkeley et al., 2008;Semensatto-Jr. et al., 2009;Hawkes et al., 2010;Camacho et al., 2015;Shaw et al., 2016;Avnaim-Katav et al., 2017). ...
... Notwithstanding, only a few papers have thus far reported on the foraminiferal distribution with altitudinal control in tropical environments (e.g. Debenay et al., 2002;Barbosa et al., 2005;Horton et al., 2005;Woodroffe, 2005;Semensatto-Jr. et al., 2009). ...
... Taken into account that our results may be used to calibrate transfer functions for sea-level reconstructions, for each sample we counted at least 100 tests from total fauna (living and dead), which may represent an adequate modern analogue for sea-level reconstructions and paleoenvironmental interpretations (Debenay et al., 2002;Horton et al., 2005;Woodroffe, 2009;Shaw et al., 2016;Avnaim-Katav et al., 2017). Moreover, dead assemblages may be more accurate for comparisons with fossil microfaunas, especially considering the taphonomic effects observed in Brazilian mangroves (Barbosa et al., 2005). ...
... However, the majority of studies to date have been con- ducted from near-or intermediate-field sites where the gla- cio-isostatic effect is more pronounced than in far-field sites in tropical regions ( Horton et al., 2005;Woodroffe, 2009). Although a few studies have attempted to consider tropical intertidal foraminifera (e.g., collected from mangrove areas, etc.) as sea-level indicators ( Horton et al., 2003;), the limited preservation potential of shells has been a major constraint (Wang & Chappell, 2001;Wilson et al., 2008). ...
... Regions far away from major glaciation centres that are tectonically stable can provide the best estimates of sea-level change ( Horton et al., 2005), and thus Malaysia could be considered as one of the ideal locations for sea-level studies in Asia (Tjia, 1996). However, studies pertinent to past sea- level in the country are still limited ). ...
... The studies on temperate salt-marsh foraminifera have identified land elevation as a direct function of foraminiferal zonation (Scott & Medioli, 1986;Horton et al., 1999). How- ever, the distribution of foraminifera in tropical intertidal areas is not only influenced by elevation ( Debenay et al., 2002;Woodroffe, 2009;Culver et al., 2013), but also by other major (controlling) factors such as taphonomic loss and type of vegetation ( Horton et al., 2005;Culver et al., 2013). Culver et al. (2013) suggests that the reconstruction of sea-level based on mangrove foraminifera is possible, but with the limitation that samples must be collected from higher mangrove swamp area where taphonomic processes and infaunal enrichment are less significant. ...
Far-field regions are locations away from major glaciation centres and can provide the best possible estimates on eustatic sea-level changes. As a far-field region of stable Sundaland, Malaysia is an ideal location for studying and predicting Holocene sea-level changes. However, modern analogues for such investigations are limited for many far-fields, including Malaysia. We examined the ecological distributions of modern subtidal benthic foraminifera on the east coast of Johor, Peninsular Malaysia. The faunal composition of surface sediment samples (279 species) was dominated by calcareous-hyaline taxa (74.4±10.2%), followed by agglutinated (13.5±7.6%) and calcareous-porcelaneous (12.1±5.2%) taxa, with the co-dominance of Asterorotalia pulchella (synonym: Asterorotalia tripinosa), Discorbinella bertheloti, Pseudorotalia indopacifica, Ammonia sp.1 and Cavarotalia annectens. Canonical Correspondence Analysis indicated that both water depth and sediment texture influenced the distributions of subtidal benthic foraminifera. Agglutinated species such as Textularia pseudosolita, T. agglutinans, Bigenerina nodosaria and T. foliacea were found in middle-shelf environments (depth >20 m), while calcareous genera such as Elphidium, Pararotalia and Ammonia were found in the inner-shelf (depth <20 m). Although the Weighted Averaging regression transfer function based on depth revealed modest performance of foraminifera (r2jack=0.40) (for which the other factors such as salinity and wave transport could be responsible), the distributions of subtidal foraminifera are clearly associated with water depth. At Johor, currently observed shifts in subtidal foraminiferal species with depth, which are linked to existing sediment types, can serve as base-line data for sea-level reconstruction on the east coast of Peninsular Malaysia.
... The analysis was based on the total foraminiferal assemblage (dead + live) found in sediment closest to the Posidonia oceanica meadows, in order to obtain data useful for (paleo)environmental reconstructions. The total assemblages represent, in fact, the subsurface assemblages, which better approximate the average environmental conditions , and do not show the spatial and temporal fluctuations of living assemblages (Horton et al. 2005). Nevertheless, according to Murray (2000) , the total foraminiferal assemblage does not reflect the biocenosis and the ecological conditions of a certain period, but it represents the addition of material from a succession of previous living assemblages modified by taphonomic processes. ...
Thirteen samples were collected from three coastal bays of northeastern Sardinia (Gallura). Bays are areas of mixed siliciclastic-carbonate sedimentation. Seagrasses and algae, widely distributed in the shallow-water environments, contribute to the carbonate factory. Near-shore benthic foraminifers (111 species, 50 genera), occurring in the shallower water areas of Posidonia oceanica, were taxonomically identified and the assemblages were investigated by statistical analysis to determine if any groups of samples or species correlate with a specific sub-environment. Dominant taxa are phytophilous and three main assemblages were identified: the Lobatula lobatula/Elphidium crispum assemblage and Lobatula lobatula/Peneroplis pertusus assemblage are linked to the distribution of P. oceanica, whereas the Peneroplis/Quinqueloculina assemblage reflects oligotrophic conditions and a mixed algal/Posidonia substrate. Taxonomic abundance and diversity appear to be mainly controlled by the type of phytal substrate.
... Towards this end, on 6 September 2011, the Protocol on Conservation of the Royal Bengal Tiger of the Sundarban was jointly signed by India and Bangladesh to undertake bilateral scientific and research projects to promote the understanding and knowledge of the Sundarbans Royal Bengal tiger and its habitat. For studying changes in sea level, accurate sea level indicators such as foraminifera have proved to be very useful (Horton et al. 2005). Many researchers have used benthic foraminiferal assemblages as indicators of sea level changes across tropical or subtropical marsh and mangrove environments (e.g., Horton et al. 2003 Horton et al. , 2005 Gehrels and Newman 2004; Woodroffe et al. 2005; Allen 2010). ...
... For studying changes in sea level, accurate sea level indicators such as foraminifera have proved to be very useful (Horton et al. 2005). Many researchers have used benthic foraminiferal assemblages as indicators of sea level changes across tropical or subtropical marsh and mangrove environments (e.g., Horton et al. 2003 Horton et al. , 2005 Gehrels and Newman 2004; Woodroffe et al. 2005; Allen 2010). Such environments in the Indian Ocean region, however, remain largely understudied (Murray 2006). ...
... rs have used benthic foraminiferal assemblages as indicators of sea level changes across tropical or subtropical marsh and mangrove environments (e.g., Horton et al. 2003 Horton et al. , 2005 Gehrels and Newman 2004; Woodroffe et al. 2005; Allen 2010). Such environments in the Indian Ocean region, however, remain largely understudied (Murray 2006). Horton et al. (2005) investigated modern foraminiferal assemblages from the surface sediments of Sulawesi mangroves in Indonesia and found significant relationships between dead and live assemblages and sea level. Few studies have reported on modern benthic foraminiferal assemblage patterns and taxonomic diversity in the Sundarbans, mainly due to the remote ...
The Sundarbans is the world’s largest contiguous mangrove ecosystem. Recent changes in the region have been reported due to a rise in relative sea level along with increased salinity intrusion. Intertidal benthic foraminifera are widely used as indicators of relative sea level change. The taxonomic diversity of foraminifera in the Sundarbans remains relatively understudied due to the remoteness of this ecoregion. The present study documented modern intertidal benthic foraminiferal assemblages across eight sites from previously unexplored eastern parts of the Indian Sundarbans. We also analyzed sediment texture from the study sites, which is essential for sea level reconstructions. Our study recorded an assemblage dominated by agglutinated genera that are characteristic of mangroves globally. However, we also recorded calcareous genera characteristic of higher-salinity zones, indicating saline intrusion further upstream in the region. In total, we recorded 15 species, representing ten different foraminiferal families. Total organic carbon (TOC) content and sediment composition showed variation across the studied sites. Canonical correspondence analysis (CCA) of the biological and environmental data confirmed its usefulness for understanding shifts in hydrological conditions across this region.
