FORAMINIFEROS BENTONICOS DEL TALUD CONTINENTAL DESDE CONCEPCION A LAS ISLAS GUAITECAS (36º- 44° S), CHILE (FORAMINIFERA: . Article: FORAMINIFEROS BENTONICOS ROTALINIDOS DEL CENTRO SUR DE CHILE (36°S – 44°S). Add this to your Mendeley library Report an error. Abstract. PATARROYO-CAMARGO, Germán David and MARTINEZ-RODRIGUEZ , José Ignacio. DEEP SEA BENTHIC FORAMINIFERA OF THE PANAMA.
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December 12, Manuscript accepted: Genus Pseudocyclammina Yabe and Hanzawa, Wall very thin, perforate calcareous porcelanaceous.
Finally, both density number of individuals per gram and diversity number of species of each sample were calculated. Foraminifera are usually included between the most promising palaeo- environmental bioindicators in recent and Holocene coastal areas e. The upper part is a wackestone of pellets and bioclasts without voraminiferos, underlying the Morelos Formation.
Report of geological reconnaissance in Department of Tuxtla, Mezcalapa and Pichucalco: Michaud studied the inoceramids of the Ocuilapa and Ocozocoautla sections and recorded some planktic foraminifera from washed foraminiferso of these foraminifero.
Present Environment and Sustainable Development, 4, Identification of genera was based on the classification proposed by Loeblich and Tappanand that of suprageneric categories on the classification of Loeblich and Tappan The genus Pseudouvigerina has been considered a homeomorph of the modern Trifarina, which typically inhabits a region ranging from the outer shelf to upper continental slope.
The geological evolution and depositional framework of this region is considered to be closely related to the opening of the Atlantic Ocean and the Gulf of Mexico in the Middle Jurassic.
Comparison with Caribbean Tethyan species abstract: Late Cretaceous planktic foraminifera generally have been assigned to the boreal and austral provinces, intermediate and equatorial Tethyan realm Sliter, ,; Huber, ; Koutsoukos, Nutrient contents increase slightly near the Nador treatment station Table 1a: Above these lies light brown bioclast packstone containing red algae, echinoids and some radists in living position; this limestone is interbedded with shale 75 m.
Some genera are highly tolerant to eutrophication e.
Foraminíferos bentónicos actuales (Marginopora vertebralis… | Flickr
I am grateful to Drs. A comparison of these results with those obtained by Ruiz et al. The lower part m contains the foraminiferal assemblage described in this paper. Glomospira urgoniana Arnaud Vanneau, Deep sea bottom currents; Panama basin; ecology; recent benthic foraminifera.
In each sample, g dry weight were slowly passed through a 63 Lm sieve. In the Nador lagoon, the most extreme of them was observed in highly polluted sediments by heavy metals collected near an old iron mine Table 1c: In Africa it has been recorded from Ethiopia Bosellini et al. Several anthropogenic inputs cause important environmental changes: In addition, several proxy taxa of the intensity of deep foraminifegos currents were detected in the analyzed assemblages.
Journal of Foraminiferal Research, 30, This lagoon is subjected to an increasing anthropogenic pressure owing to the economic activities in the adjacent areas: Test characterized by megalospheric embryonic apparatus in central position consisting of a large embryonic chamber covered by a layer of small chamberlets.
A small increase in nutrients can be beneficial for foraminifera, although a high nutrification may have negative effects on them Osawa et al. This dating shows its spread from east to west by Tethyan transoceanic currents, and may be related to the meroplanktonic stage of the megalospheric embryos, bentonicoa a subsequent phase as epiphytic organisms.
V,Cretaceous paleoceanography; Evidence from planktonic foraminiferal evolution, in Barrera, E. According to Michaud and Fourcadethe Jurassic sedimentation is interpreted within the rift model.
Diversity is clearly foraminifsros near the artificial jetties of Nador lagoon four speciesa very unstable area owing to the dredging of the foraminiferod sediments and the permanent traffic of fishing boats in relation to the quieter artificial inlet of El Melah lagoon Table 1c: Test planispiral, wall coarsely agglutinated, with subepidermal network.
The terrigenous rocks located in the environs of the town of Ocozocoautla were first documented when Sapper made a geological reconnaissance of the Chiapas region. Molina Universidad de Zaragoza for reviewing the manuscript and for useful comments which improved the paper.
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Estuarine, Coastal and Shelf Science, 61, The studied section is located in the state of Chiapas in southeastern Mexico Figure 1.
We are grateful to Salvador Morales Soto who provided the material and locality information for this study. Ostracoda as environmental tracers: This association is documented here for the first time in the study area and Melathrokerion valserinensis for the first time in Mexico. A postrift phase occurred during the Kimeridgian, with the development of a carbonate platform Scott, ; Salvador, The eastern borders of both lagoons samples N4 and E4 present foraminiferal assemblages similar to those observed in subtidal sediments e.
High levels of trace metals cause the disappearance of ostracods and the exclusive presence of tolerant species of foraminifera, a response observed in other areas subjected to acid mine drainage processes and recent bentpnicos pollution Ruiz et al.