Juni Pengamatan foraminifera dilakukan di wilayah sekitar Teluk Jakarta mulai dari pesisir sampai perairan laut terbuka. Hasil penelitian menunjukkan terdapat perbedaan komposisi jenis pada foraminifera yang terdapat di daerah muara, teluk dan laut terbuka, serta munculnya abnormalitas pada morfologi cangkang Ammonia beccarii. Perbedaan komposisi jenis serta kemunculan cangkang abnormal ini merupakan respon foraminifera terhadap pengaruh beberapa faktor lingkungan.
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Adult A. Rapid 3-D emission of pseudopodia from interlocular spaces on both umbilical and spiral sides of adult A. This behaviour is characteristic of phytal species. Thus, it appears that the major difference between A. We believe that these observations could help to solve the long-lasting A. All rights reserved. Keywords: benthic foraminifera; North Atlantic; morphofunction; microhabitat 1.
Introduction ; Walton and Sloan, ; Haynes, ; Buzas et al. Ammonia tan species dwelling in littoral and neritic environ- beccarii s. It has been extensively studied in various ronmental and geological studies because of its great aspects, such as, geographic distribution, ecology, abundance, wide geographic distribution, and long biology, life-cycles, morphology, structure, and en- duration since the Miocene.
Most recently, micro- vironmental applications from all over the world habitat and DNA studies of A. Fax: C33 ; E-mail: Debenay et al.
Over 20 taxa species, subspecies and varieties , with close affinities to A. Schnitker suggested that many of them including Ammonia tepida are ecophenotypes and so junior synonyms of A. Poag , Wang and Lutze , Jorissen , and Walton and Sloan ac- cept this opinion, considering that the occurrence of the morphotypes and their geographical distribution may be related to climate, temperature and salinity Poag, or to food availability, feeding strategy, oxygen concentration and sediment type Jorissen, Haynes suggested that the A.
Location map of studied areas. The most recent DNA analysis, however, suggests A. Previous studies soniana belong to three different species based on a study of six morphotypes Pawlowski et al. Thousands of small tests to an exceptionally wide morphological variation of of Ammonia, poorly ornamented, without definite its test Billman et al.
It is evident that the beading and furrowing on either spiral and umbilical uncertain and inappropriate taxonomic status of the sides were observed. We retained the name of A. These two species In studies of foraminifera from the Atlantic coast were observed in fine sediments collected in areas of France, two Ammonia species have been widely generally devoid of seagrass and of algae, in various reported: A. In this paper, we provide new ob- Favry et al. This might be related Fig.
These are used as the basis for morphofunc- to the temperature requirement of the species for tional arguments to distinguish A. Numerous Pseudoeponides falsobecca- These were also investigated, but no living forami- rii were observed on the shelf of Senegal Debenay nifera were found on them.
About 30 of Since , living A. All these movements. February in the muddy intertidal zone of the Gulf of Morbihan Redois, and in about samples of intertidal sediments collected in the Bay 4. Observations of Bourgneuf during unpublished data. More than 10 tests were observed under a stereomi- 4.
External morphology croscope. These observations were supplemented by SEM investigation and by observations of about 30 We only describe here the most important fea- living specimens with a phase contrast microscope. Gran- on the Yeu Island in the Atlantic ocean, about 20 ules are developed in the umbilical area, and adult km from the Atlantic coast of mainland France. It specimens usually bear umbilical plugs Plate I, 2, provides excellent conditions for investigation of liv- 3. The deeply engraved sutures, edged with promi- ing benthic foraminifera.
It is only 10 m from the nent thickenings on both umbilical and spiral sides, metamorphic rocky shore where various seaweeds result in open interlocular spaces, between radial grow, with interspersed coarse sandy beaches. Tides chamber walls and between successive whorls. These are semi-diurnal with a mean tidal range of about spaces are connected to the chambers in the umbili- 5 m.
In early stages, the external ornamentation Weekly investigation has been carried out for one of A. The thalli were in- interlocular spaces between the last chambers on the vestigated as well as the sediment trapped among spiral side.
However, the sutures are always lim- their bases. Other types of seaweeds predominated in bate and prominent, which allows distinction from A. In September, hundreds of tests were oped on the spiral side. It is smaller than A.
In May, some living 6, 7. Habitat rocky lumps, in the Bay of Bourgneuf. These observations show that A. Ammonia beccarii can move on its umbili- sand or sandy mud of the Bay of Bourgneuf, of the cal side when moving on a 2-dimensional support Gulf of Morbihan and in small estuaries such as Plate I, 1 , but can be suspended in the 3-dimensional the Vie estuary. The living specimens were epipelic framework of the algal thalli.
It can then be considered or shallow endopelic. Ammonia tepida was never as a phytal form, as defined by Kitazato Six in- observed on the seagrass leaves Zostera nor on the dividuals were counted in 10 g of C.
This number increased progressively up areas. It was also never observed on rocky shores to about 40 individuals in July. In August, Gigartina surrounding Yeu Island.
On the same thalli, numerous specimens of 4. Emission of pseudopodia crawling species Rosalina spp. Other phytal forms Elphidium pul- rii s. Free liv- extruded within a few seconds from suture areas ing species Brizalina spp. In Plate I, 8, 9. In Petri dishes, we found that A.
Ammonia beccarii s. The white shell below Ammonia beccarii s. Granules are developed in the umbilical area, but this specimen does not bear an umbilical plug.
The deeply engraved sutures are edged with prominent thickenings. Ammonia tepida, umbilical view, showing the pseudopodia regularly distributed around the test. Ammonia tepida moves on its umbilical face when observed in Petri dishes. Pseudopodia are more regu- 5. Shift in microhabitat larly distributed than those of A. Endopelic species are often very motile and pre- sumably stay at a particular sediment depth when conditions are suitable Linke and Lutze, , but 5.
Some highly coast of France: A. This is in loides may change from epipelic to endopelic habi- contradiction with the general opinion that Ammonia tats in changing environmental conditions Linke and is endopelic review in Murray, Lutze, These opportunist species can even be Living A.
This work shows that A. It has been shown on dances result from a complex interaction between other species that the interlocular spaces serve to pro- numerous parameters including feeding strategy, tect differentiated pseudopodial cytoplasm that con- morphological adaptation, pseudopodial network, tains fragments of polymerized tubulin Hottinger nature and life-span of the substrate. These shifts and Dreher, ; Hottinger, , The pres- indicate that the distribution of the foraminiferal ence of polymerized tubulin fragments allows rapid faunas is a dynamic process and that it is difficult extrusion of pseudopodial network Langer, However, certain foraminiferal species of life on rocky shores is characteristic of phytal e.
Cibicidoides wuellerstorfi and Rupertina sta- forms Kitazato, It may be compared with bilis can be regarded as strictly epibenthic species, the emission of pseudopodia from the numerous fos- colonizing elevated habitats that are strongly affected settes of the epiphytic Elphidium spp. Peneroplis planatus which is a selective mi- tinger, In the study area, 2 Elphidiid species crobial feeder Faber and Lee, has also only were found: E.
These species extruding a 3- habitat preference of A. However, A. Moreover, this species was reported 5. In this case, it is endopelic, habitats depending on the shape and structure of the and the role of interlocular spaces might be different. They might be used to maintain motility during the It is widely accepted that modes of attachment, test retracted stages, which can be an adaptation to life shape and geometric disposition of apertural open- at the sediment-water interface where temporarily ings in benthic foraminifera strongly affect pseu- poisoned microenvironments may be developed, due dopodial deployment, moving behaviour and feeding to the input of decaying organic detritus Hottinger, strategies Langer, The morphotype concept The phytal form of Kitazato carii in the study area.
The examples given by 5. Differences between A. This phytal form corresponds to the morphotype C Observations of A. We consider that the essential difference between SEM photographs were made by M. Lesourd in A. Other species with interlocular Alexander, S.
AMMONIA BECCARII PDF
Views View Edit History. While several different forms exist, many authors consider the genus to consist of a single species, Ammonia beccariiwith many amonia. Ammonia is a genus of marine foraminifers. Nautilus beccarii Linnaeus Based on a comparison between molecular results and morphology, the following species appear to be valid:.
Ammonia tepida (Cushman, 1926)
This clade can be further divided in three subclades. Kiel Fjord Elphidium belong to two of these subclades and were identified morphologically as the subspecies E. Introduction Ammonia and Elphidium are the two most abundant benthic foraminiferal genera worldwide Murray Elphidium species occur from tropical to polar regions and from the intertidal zones to the continental slope Murray
Bruce Hayward and Dr. Magali Schweizer the following reasoning is seen as outdated July Please go to Ammonia Description: test low trochospiral, biconvex, spiral side evolute, umbilical side involute, periphery rounded to carinate, wall calcareous; aperture an interiomarginal extraumbilical arch William R. Walton, and Benjamin J. Sloan, The genus Ammonia Bruennich, its geographic distribution and morphologic variability in The Journal of Foraminiferal Research; April ; v. They argue, that before establishing new species ecophenotypic variations should be considered. All established species such as A.