Short term processes and patterns in the foraminiferal response to organic flux rates

Altenbach, Alexander V.

doi:10.1016/0377-8398(92)90024-e

Cited by 155 publications

(71 citation statements)

References 12 publications

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“…This underpins the strong relationship of the availability of food, in particular diatoms, and foraminiferal population density (Altenbach, 1992;Schönfeld and Numberger, 2007b).…”

Section: Foraminiferal Population Density and Species Compositionmentioning

confidence: 95%

Foraminiferal response to environmental changes in Kiel Fjord, SW Baltic Sea

Nikulina

Polovodova

Schönfeld

2008

eEarth

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Abstract. The living benthic foraminiferal assemblages in Kiel Fjord (SW Baltic Sea) were investigated in the years 2005 and 2006. The faunal studies were accomplished by geochemical analyses of surface sediments. In general, sediment pollution by copper, zinc, tin and lead is assessed as moderate in comparison with levels reported from other areas of the Baltic Sea. However, the inner Kiel Fjord is still exposed to a high load of metals and organic matter due to enhanced accumulation of fine-grained sediments in conjunction with potential pollution sources as shipyards, harbours and intensive traffic. The results of our survey show that the dominant environmental forcing of benthic foraminifera is nutrients availability coupled with human impact. A comparison with faunal data from the 1960s reveals apparent changes in species composition and population densities. The stress-tolerant species Ammonia beccarii invaded Kiel Fjord. Ammotium cassis had disappeared that reflects apparently the changes in salinity over the last 10 years. These changes in foraminiferal community and a significant increase of test abnormalities indicate an intensified environmental stress since the 1960s.

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“…This underpins the strong relationship of the availability of food, in particular diatoms, and foraminiferal population density (Altenbach, 1992;Schönfeld and Numberger, 2007b).…”

Section: Foraminiferal Population Density and Species Compositionmentioning

confidence: 95%

Foraminiferal response to environmental changes in Kiel Fjord, SW Baltic Sea

Nikulina

Polovodova

Schönfeld

2008

eEarth

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“…In the deep ocean, phytodetritus derived from primary productivity in the euphotic zone provides an important source of fresh organic matter for benthic organisms. Deep-sea foraminifera exhibit rapid physiological and feeding responses when presented with labile food (Linke, 1992;Altenbach et al, 1992;Linke et al, 1995). Field and laboratory studies suggest that some species undergo reproduction and population growth following the deposition of phytodetritus in both bathyal and abyssal settings (e.g.…”

Section: Introductionmentioning

confidence: 99%

Uptake of algal carbon and the likely synthesis of an "essential" fatty acid by Uvigerina ex. gr. semiornata (Foraminifera) within the Pakistan margin oxygen minimum zone: evidence from fatty acid biomarker and 13C tracer experiments

et al. 2014

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Abstract. Foraminifera are an important component of benthic communities in oxygen-depleted settings, where they potentially play a significant role in the processing of organic matter. We tracked the uptake of a 13 C-labelled algal food source into individual fatty acids in the benthic foraminiferal species Uvigerina ex. gr. semiornata from the Arabian Sea oxygen minimum zone (OMZ). The tracer experiments were conducted on the Pakistan margin during the late/post monsoon period (August-October 2003). A monoculture of the diatom Thalassiosira weisflogii was 13 C-labelled and used to simulate a pulse of phytoplankton in two complementary experiments. A lander system was used for in situ incubations at 140 m water depth and for 2.5 days in duration. Shipboard laboratory incubations of cores collected at 140 m incorporated an oxystat system to maintain ambient dissolved oxygen concentrations and were terminated after 5 days. Uptake of diatoms was rapid, with a high incorporation of diatom fatty acids into foraminifera after ∼ 2 days in both experiments. Ingestion of the diatom food source was indicated by the increase over time in the quantity of diatom biomarker fatty acids in the foraminifera and by the high percentage of 13 C in many of the fatty acids present at the endpoint of both in situ and laboratory-based experiments. These results indicate that U . ex. gr. semiornata rapidly ingested the diatom food source and that these foraminifera will play an important role in the short-term cycling of organic matter within this OMZ environment.

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“…Several recent investigations indicate that there are seasonal pulses of sedimented particulate organic matter into the deep sea (Deuser & Ross 1980, Deuser et al 1981, Honjo 1982, Billett et al 1983, Lampitt 1985, Rice et al 1986, Thiel et al 1988, which stimulate the activity of small organisms like microflagellates , foraminifera (Gooday 1988, Altenbach 1992, and bacteria (Turley & Lochte 1990, Meyer-Reil & Koster 1992, Poremba 1994 at the sea floor. The time lag for the microbial response to pulses of nutrient supply seems to be occasionally only 5 1 wk (Graf 1989, Boetius & Lochte 1994.…”

Section: Introductionmentioning

confidence: 99%

Spatial variation of benthic microbial production and hydrolytic enzymatic activity down the continental slope of the Celtic Sea

Poremba¹,

Höppe²

1995

Mar. Ecol. Prog. Ser.

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Microbial activity was determined in the upper 10 cm of sediments and in bottom water of the European continental shelf margin in the Celtic Sea (Goban Spur: 48" to 50' N, 10" to 14' W; 135 to 1680 m deep). Assays used were the measurement of bacterial abundance (determined by epifluorescence microscopy), bacterial production (by thymidine incorporation) and hydrolytic enzymatic activity (by cleavage of fluorogenic model substrates). The highest activity was always measured in the top horizon (upper 1 cm layer) of the sediment, while in the water overlying the sediment about 1 to 5% of the sediment's surface value was found. The highest hydrolytic activity was mostly achieved by protease followed by esterase, chitinase, 0-glucosidase, and a-glucosidase. Most tested activities in the sediment declined with increasing depth down the continental slope, but the steepness of decline was different for the various substrates. While protease and chitinase showed nearly no depth relation, there was a strong response recorded for the 2 glycosidases. This leads to shifting ratios between the activities, indicating that not only microbial growth and general decomposition activity but also the type of reactions involved in the decomposition processes change with depth. Our observations may reflect differences in the microbial population structure as well as availability and biodegradability of specific compounds at the sea floor, as a result of successive losses of easily degradable substances from particulate organic matter on its way from the epipelagic zone to the sediment.

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Short term processes and patterns in the foraminiferal response to organic flux rates

Cited by 155 publications

References 12 publications

Foraminiferal response to environmental changes in Kiel Fjord, SW Baltic Sea

Foraminiferal response to environmental changes in Kiel Fjord, SW Baltic Sea

Uptake of algal carbon and the likely synthesis of an "essential" fatty acid by <i>Uvigerina</i> ex. gr. <i>semiornata</i> (Foraminifera) within the Pakistan margin oxygen minimum zone: evidence from fatty acid biomarker and <sup>13</sup>C tracer experiments

Spatial variation of benthic microbial production and hydrolytic enzymatic activity down the continental slope of the Celtic Sea

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