Benthic response to sedimentation of a spring phytoplankton bloom: Process and budget

Graf, Gerhard; Bengtsson, W.; Diesner, U.; Schulz, Rüdiger; Theede, H.

doi:10.1007/bf00401286

Cited by 271 publications

(124 citation statements)

References 19 publications

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“…In the beginning of the 1980s, scientists from Kiel delivered significant contributions to the understanding of the role of phytodetritus as food for the benthic system (Graf et al, 1982;Smetacek, 1984). They showed that in the shallow waters off Kiel, the benthic response to a settling phytoplankton bloom occurred within less than one week.…”

Section: Benthic-pelagic Couplingmentioning

confidence: 99%

Marine benthic faunal successional stages and related sedimentary activity

Rosenberg¹

2001

Sci. Mar.

187

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SUMMARY: This paper is a brief review of successional stages and activity of benthic soft-bottom communities. Benthic communities was first described by Petersen in the 1910s and further developed by Molander, Thorson and Margalef. Successional stages of benthic communities chance in a predictable way in relation to environmental disturbance and food availability. Food supply to the bottom can occur as a vertical flux, but transport through lateral advection is more important in some areas. While at the bottom, the infauna processes the food in many different ways, and the feeding modes can be categorised into more than 20 functional groups, but fewer are present in brackish water. This categorisation is based on animal mobility and where and how they ingest the food. Animal activity in the sediment, bioturbation, has a significant effect on redox conditions and diagenetic processes. Structures in the sediment due to infaunal presence and activity can be observed in situ by sediment profile imaging, and the biogenic structures and redox conditions can be parameterised and have been shown to correlate to benthic community successional stages. The largest threat to benthic faunal biodiversity is the spread of near-bottom oxygen deficiency in many enclosed are stratified coastal areas.

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Section: Benthic-pelagic Couplingmentioning

confidence: 99%

Marine benthic faunal successional stages and related sedimentary activity

Rosenberg¹

2001

Sci. Mar.

187

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“…Availability of organic material is one of the key factors controlling structure and activity of microbial communities in anoxic freshwater lake sediment (Graf et al 1982;Sander and Kalff 1993). Therefore, input of organic material into the sediment associated with annual algae blooms results in a response of the microbial community within the sediment (Goedkoop et al 1997;Tornblom and Rydin 1998), for example, in the microbial production of CH 4 (Schulz and Conrad 1995).…”

mentioning

confidence: 99%

Response of the methanogenic microbial community of a profundal lake sediment (Lake Kinneret, Israel) to algal deposition

Schwarz

Eckert

Conrad

2008

Limnology & Oceanography

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An algal bloom of Peridinium gatunenese generally precedes the annual maximum of methane release from the profundal sediment of Lake Kinneret. Therefore, we investigated the response of the sediment methanogenic microbial community to simulated algal deposition. Addition of algal biomass on top of sediment cores resulted in increased CH 4 production rates and concentrations of the fermentation products acetate and propionate in the upper 4-cm layers with maximum values at 1-cm depth. Addition of algae to sediment slurries also resulted in increased CH 4 production rates and a transient increase of H 2 , propionate, and acetate concentrations within the first 10 d after addition. The composition of the active microbial community was determined by analysis of terminal restriction fragment polymorphism (T-RFLP) targeting ribosomal RNA and cloning and sequencing of reverse-transcribed 16S rRNA. Analysis of the sediment in the presence and absence of algae indicated that among the Bacteria, members of Deltaproteobacteria and Clostridiales responded by synthesis of ribosomes after 1 d of incubation and those of Bacteroidetes after 6 d. Among the Archaea, ribosomal RNA of the Methanosaetaceae (i.e., acetate-utilizing methanogens) slightly increased after 6 d. Algal deposition apparently stimulated ribosomal synthesis in these sediment microorganisms, thus resulting in increased activity. We conclude that these microorganisms were involved in degradation of the algal biomass resulting in transient release of acetate and other fermentation products and increased production of CH 4 .

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“…biomass and metabolism (Graf et al, 1982). Energy produced during annual production 53 cycles propagates through the food web, with increasing lag and attenuation as it passes to 54 larger animals with slower turnover times (Pope et al, 1994).…”

mentioning

confidence: 99%

Nematode community dynamics over an annual production cycle in the central North Sea

Schratzberger¹,

Forster²,

Goodsir³

2008

Marine Environmental Research

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Nematode species composition, trophic structure and body size distributions were followed over an annual production cycle in the central North Sea; to test responses to temporally changing food quality and quantity in the sediment. Changes in the phytoplankton concentration in the water column were quantitatively reflected in the concentration of chlorophyll a and breakdown products in the sediment, with higher concentrations in spring and autumn following blooms, and lower concentrations in summer and winter. The taxonomic and trophic structure of nematode communities differed significantly among stations over relatively short distances, potentially masking some of the temporal dynamics. Spatio-temporal differences in nematode species composition were linked to changes in the quality and quantity of organic material reaching the seabed, reflecting a species-specific response to the nutritional quality of sedimenting organic material and the biochemical changes in the sediment associated with its decomposition. The size distributions of selected nematode species indicated that most species bred continuously throughout the sampling period, although one species, the epigrowth feeder Spilophorella paradoxa, had periods of increased growth following the deposition of the spring phytoplankton bloom. There was no consistent temporal relationship between the trophic composition of nematode communities and spring chlorophyll a or carbon sedimentation, most likely a result of the trophic plasticity of most feeding types and the capacity of the community to use both freshly sedimented material as well as the subsequent breakdown products and refractory organic matter. Community metrics implied that there were small responses to the seasonal production cycle, but these belied strong responses of a few species with life histories that allowed them to track the availability of suitable food resources

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Benthic response to sedimentation of a spring phytoplankton bloom: Process and budget

Cited by 271 publications

References 19 publications

Marine benthic faunal successional stages and related sedimentary activity

Marine benthic faunal successional stages and related sedimentary activity

Response of the methanogenic microbial community of a profundal lake sediment (Lake Kinneret, Israel) to algal deposition

Nematode community dynamics over an annual production cycle in the central North Sea

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