Behaviour and taphonomic loss in foraminiferal assemblages of mangrove swamps of French Guiana

Debenay, Jean-Pierre; Guiral, Daniel; Parra, M.

doi:10.1016/j.margeo.2004.04.013

Cited by 53 publications

(28 citation statements)

References 37 publications

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“…4). Thus, the data clearly show that the abundance shifts recorded for those species represent a distinct trend over the habitats sampled and do not result from patchy foraminiferal distribution or postmortem change as seen elsewhere (Debenay, Guiral and Parra 2004;Catia et al, 2005) probably because of the limited extent of the habitats along the Moorea lagoon/land interface. The most obvious trend is the general increase in foraminiferal species diversity from the shore (Hibiscus/Paspalum) towards the lagoon (text- fig.…”

Section: Discussionsupporting

confidence: 64%

Assembly and persistence of foraminifera in introduced mangroves on Moorea, French Polynesia

Langer

Lipps

2006

Micropaleontology

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Foraminifera inhabiting the muddy substrata within the coastal mangrove forests (Rhizophora stylosa Griff.) on Moorea, French Polynesia, are distinct from other near shore foraminiferal assemblages around the island. Yet the mangroves were introduced from New Caledonia only in 1937 at Vaianahe Bay; they have since spread to many other sites around Moorea. They invade and occupy mud substrata below Paspalum marshes, the marshes themselves and mud under overhanging Hibiscus stands. The mangrove foraminifera cluster uniquely among themselves when compared to other lagoonal habitats, including those invaded by the mangroves. Thus, the introduction of mangroves has apparently allowed the development of a new community or assemblage of foraminifera.Mangrove foraminifera include Ammoastuta salsa, Ammotium tepida, Paratrochammina stoeni, Reophax cf. R. bacillaris, Trichohylus aguayoi, Trochammina inflata, and other subsidiary species of Ammonia, Elphidium, Quinqueloculina, Cornuspira, and Rosalina. Arenoparrellla mexicana, a characteristic species in mangroves elsewhere, is absent from Moorea, perhaps because it was never there like the mangroves themselves. The mangrove species cluster midway between those of shallow-water lagoonal mud, salt grass Paspalum marshes, and the muddy habitats below Hibiscus trees, even when they occur at similar elevations above or below sea level.The foraminifera in the unique cluster in the mangroves were not introduced with the initial mangrove trees, as the trees were established from propagules carried to the site by humans. The cluster is also found in other newer stands on the island that were colonized by floating propagules. The foraminiferal mangrove assemblage at Moorea is a more recent amalgamation of taxa recruited from the species pools in the associated salt grass Paspalum, Hibiscus and shallow-water lagoonal mud habitats. This recruitment happened quickly, most likely as soon as the mangroves grew to sufficient size to trap fine sediment and organic material, as these species are constantly transported about the lagoon chiefly by birds, rafts of algae or foam, and turbidity created by winds and storms. Some but not all foraminiferal species from these environments were able to occupy the new mangrove habitat. This indicates that the unique clusters of foraminifera have no biologic unity, but are simply associations of species that tolerate slightly different but similar environments at different elevations and with increased organic content, and with decreased wave action caused by mangrove roots. Previous studies of foraminiferal and other associations also indicate that in many situations marine organisms are not necessarily dependent on other specific species. Even in seemingly structured reef and rocky-shore communities with geologic histories of similar communities over thousands of years, the rapidity with which dispersal of larvae, eggs, or adult organisms takes place, and similar environmental conditions maintain this similarity of community, not principally any biolo...

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Section: Discussionsupporting

confidence: 64%

Assembly and persistence of foraminifera in introduced mangroves on Moorea, French Polynesia

Langer

Lipps

2006

Micropaleontology

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“…Off southern Venezuela, and Guyana as far as the Essequibo River, Drooger & Kaasscheiter (1958) found the reverse pattern, P. atlanticum occurring mostly in shallower water than H. concentrica. Debenay et al (2004) recorded P. atlanticum living on marine-influenced, shallowwater mudflats adjacent to mangrove swamps in French Guyana, but did not find H. concentrica. This suggests that P. atlanticum lives more proximal to rivers than does H. concentrica.…”

Section: Study Areamentioning

confidence: 87%

Trouble in Paradise? A comparison of 1953 and 2005 benthonic foraminiferal seafloor assemblages at the Ibis Field, offshore eastern Trinidad, West Indies

Wilson

2006

J. Micropalaeontol.

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Foraminiferal communities are not static, but change in response to environmental perturbations. Given sufficient time, the change will be recorded in the total (live+dead) seafloor assemblage, from which valuable information regarding environmental trends can be obtained by re-sampling assemblages at the decadal scale.The seafloor assemblage in the 5 km 6 km Ibis Field, off southeast Trinidad, first surveyed in 1953, was re-examined in 2005. The fauna had changed markedly between the surveys. Overall increases in the proportional abundances of Uvigerina subperegrina, Ammonia pauciloculata/Rolhausenia rolhauseni and Pseudononion atlanticum indicate an increase in nutrient supply that apparently killed off Cibicidoides pseudoungerianus and Miliolinella subrotunda, and reduced the relative abundance of Hanzawaia concentrica, but did not affect the relative abundance of Cancris sagrai. As shown by similar 1953 and 2005 planktonic/benthonic foraminiferal ratios, the increased nutrient supply impacted on both surface and bottom waters.Of the six most abundant species in 2005, five showed the same general biogeographical distributions within the field in 1953 and 2005. However, whereas the proportional abundance of Uvigerina subperegrina in 1953 increased southwards, in 2005 it increased northwards.Trinidad cannot be the source for the nutrient enrichment: the island lies down-current from the Ibis Field. Sources must therefore be sought up-current and to the southeast, in the Amazon, Essequibo and Orinoco river basins, or along the South American shoreline. It is speculated that the nutrient enrichment may be a consequence of increased phytoplankton primary production associated with nitrogen-rich run-off from South American sugarcane plantations, or from flushing of organic carbon from poorly regulated sewage systems or shrimp farms in South America. J. Micropalaeontol. 25(2): 157-164,

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“…Likewise, Goldstein and Watkins (1998), in a study of the saltmarsh of St. Catherine's Island, Georgia, found significant differences in the foraminiferal distribution patterns compared to those described by Scott and Medioli (1978, 1980a, 1986, which they explained by differences in geographical setting, including differences in saltmarsh physiography. In the mangrove swamps of French Guiana, elevation was found to have only minor influence on the distribution of foraminiferal assemblages (Debenay et al, 2004).…”

Section: Introductionmentioning

confidence: 88%

Ecological zonation of benthic foraminifera in the lower Guadiana Estuary (southeastern Portugal)

Camacho

Moura

Connor

et al. 2015

Marine Micropaleontology

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The present study analyzes the spatial distribution and seasonal distribution of live benthic foraminiferal communities in the estuary of Guadiana, the fourth largest river on the Iberian Peninsula, and establishes, through statistical analysis, their relationships with a series of environmental parameters. Forty-four superficial sediment samples were collected along distance-to-sea and elevation gradients in the winter and summer of 2010. Fiftythree foraminifera species were identified along the intertidal margins of the estuary. Foraminiferal distribution reflected seasonal variation of environmental factors, whose relative importance varied according to species tolerances. Elevation in relation to mean sea level appeared to be the most important parameter controlling foraminiferal distribution, probably because it combines the effects of a series of other variables (i.e. organic matter, sediment texture, pH and temperature). In the highest marsh areas, where environmental conditions approach survival thresholds, only some agglutinated species are able to survive. In the lower intertidal zone, where subaerial exposure is diminished and environmental conditions are generally less variable, more diverse faunas, mainly composed of calcareous species, prevail. During winter, when fluvial discharge peaks, agglutinated species represent more than 80% of the total individuals. In summer, when marine conditions prevail, calcareous species become more competitive, increase their densities and expand into higher marsh zones and estuarine upper reaches. In the estuary, three different foraminiferal assemblages are distinguished: i) Miliammina fusca assemblage, which dominates in unvegetated areas of the lower marsh and tidal flats of the mid-upper estuary; ii) Jadammina macrescens assemblage, which dominates in the highest marsh areas in the lower estuary; and iii) Ammonia aberdoveyensis assemblage, which dominates the areas of low marsh and tidal flats of the lower estuary.

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Behaviour and taphonomic loss in foraminiferal assemblages of mangrove swamps of French Guiana

Cited by 53 publications

References 37 publications

Assembly and persistence of foraminifera in introduced mangroves on Moorea, French Polynesia

Assembly and persistence of foraminifera in introduced mangroves on Moorea, French Polynesia

Trouble in Paradise? A comparison of 1953 and 2005 benthonic foraminiferal seafloor assemblages at the Ibis Field, offshore eastern Trinidad, West Indies

Ecological zonation of benthic foraminifera in the lower Guadiana Estuary (southeastern Portugal)

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