Transport and distribution of nutrients and chlorophyll-a by mesoscale eddies in the northeastern Mediterranean

Salıhoğlu, I.; Saydam, C.; Baştürk, Özden; Yılmaz, Koray K.; Göçmen, D; Hatipoglu, E.; Yılmaz, Ali Özgür

doi:10.1016/0304-4203(90)90024-7

Cited by 84 publications

(43 citation statements)

References 9 publications

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“…The eastern part of the Mediterranean Sea is a highly oligotrophic, phosphorus limited system with corresponding low phytoplankton biomass and production (Salihoglu et al 1990; Krom et al 1991;Robarts et al 1996). In oligotrophic seas, bacterioplankton biomass often exceeds phytoplankton biomass even in the euphotic zone, and Ͼ50% of the primary production can be channeled through bacterioplankton (Azam et al 1983;Cho and Azam 1990).…”

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confidence: 99%

Horizontal and vertical complexity of attached and free‐living bacteria of the eastern Mediterranean Sea, determined by 16S rDNA and 16S rRNA fingerprints

Moeseneder

Winter

Herndl

2001

Limnology & Oceanography

177

148

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The community structure of attached and free-living bacteria in the Aegean Sea (eastern Mediterranean Sea) was analyzed with use of terminal-restriction fragment length polymorphism (T-RFLP) fingerprinting. Since the Aegean Sea is characterized by rather small temperature fluctuations between surface and deep-water layers, it represents an ideal study site to determine the variations in the community structure of bacteria with depth, since environmental factors other than temperature are likely to determine depth zonation of bacteria. The analysis of 132 T-RFLP electropherograms indicated pronounced differences among the attached and free-living bacterial communities defined as operational taxonomic units (OTUs). Distinct vertical differences of attached and free-living OTUs were found between mesopelagic waters (Ͼ200 m depth) and the upper mixed water column (ϳ10-200 m). Attached and free-living OTUs differed considerably throughout the water column, with only ϳ35% for the South Aegean and ϳ24% for the North Aegean of all OTUs in both free-living and attached OTUs. Approximately 50% of attached and free-living OTUs were present throughout the water column. Fingerprinting analysis using 16S rRNA indicated that only ϳ14% of the attached and ϳ33% of the free-living OTUs were identical to the 16S rDNA fingerprints. The distribution of free-living versus attached bacteria as obtained in this study suggests that even in the absence of temperature as a major selective factor, a distinct deep-water bacterial community exists (particularly in the free-living mode). The deep-water free-living bacterial community appears to be as compositionally complex as the surface water free-living bacterial community.

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confidence: 99%

Horizontal and vertical complexity of attached and free‐living bacteria of the eastern Mediterranean Sea, determined by 16S rDNA and 16S rRNA fingerprints

Moeseneder

Winter

Herndl

2001

Limnology & Oceanography

177

148

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“…Lateral transport of organic material produced in coastal regions into greater depths is of major importance in maintaining diverse assemblages of microbial organisms at the seafloor (Salihoglu et al, 1991;Rabitti et al, 1994). Deep-sea abundance and biodiversity are, therefore, significantly correlated with depth and distance to the nearest coast, with the latter factor being more decisive (Boetius et al, 1996;Krö ncke et al, 2003).…”

Section: Discussionmentioning

confidence: 99%

Analysis of the community structure of abyssal kinetoplastids revealed similar communities at larger spatial scales

et al. 2011

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Knowledge of the spatial scales of diversity is necessary to evaluate the mechanisms driving biodiversity and biogeography in the vast but poorly understood deep sea. The community structure of kinetoplastids, an important group of microbial eukaryotes belonging to the Euglenozoa, from all abyssal plains of the South Atlantic and two areas of the eastern Mediterranean was studied using partial small subunit ribosomal DNA gene clone libraries. A total of 1364 clones from 10 different regions were retrieved. The analysis revealed statistically not distinguishable communities from both the South-East Atlantic (Angola and Guinea Basin) and the South-West Atlantic (Angola and Brazil Basin) at spatial scales of 1000-3000 km, whereas all other communities were significantly differentiated from one another. It seems likely that multiple processes operate at the same time to shape communities of deep-sea kinetoplastids. Nevertheless, constant and homogenous environmental conditions over large spatial scales at abyssal depths, together with high dispersal capabilities of microbial eukaryotes, maintain best the results of statistically indistinguishable communities at larger spatial scales.

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“…Since these eddies can have a structure, chemistry, and biology differing sharply from the surrounding water mass (Chernyakova and Borodkin, 1988), sampling done in the eddy cannot simply be averaged into the water mass values. The presence of such eddies, at the surface and at depth, means that our simple continuity model is no longer sufficient to describe the distribution of oceanic properties; if we wish to understand the transport of organisms and of some chemical entities, we must include these discontinuous regions in our models (Salihoglu et al, 1990).…”

Section: The Continuity Principlementioning

confidence: 99%

Methods of sampling and analysis and our concepts of ocean dynamics

Wangersky¹

2005

Sci. Mar.

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SUMMARY: In the last two decades, the increase in multi-nation, multi-ship projects has underlined the importance of intercalibration and intercomparison studies. At the same time, it is becoming obvious that with our present methods of sampling and analysis we can never hope to distinguish the variability in our sampling and analysis techniques from the variability in the universe sampled. The presence of discontinuities in many of the quantities measured suggests that our sampling grid, as maintained by oceanographic vessels, is too limited both in space and in time. Some variety of self-reporting sampling buoy is the obvious answer for physical and chemical parameters, although as yet we do not have detectors for many of the quantities of interest. Even with such buoys, it would seem unlikely that we could construct a grid of such buoys tight enough to measure the local variability of the oceans without the buoys themselves contributing to this variability. The limit finally selected for such a sampling grid will probably be some compromise between scientific capability and economic reality. -En las dos últi-mas décadas el incremento de los proyectos multi-nacionales, con la utilización de muchos barcos ha subrayado la importancia de inter-calibración y comparación de estudios. Al mismo tiempo es obvio que con los métodos actuales de muestreo

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Transport and distribution of nutrients and chlorophyll-a by mesoscale eddies in the northeastern Mediterranean

Cited by 84 publications

References 9 publications

Horizontal and vertical complexity of attached and free‐living bacteria of the eastern Mediterranean Sea, determined by 16S rDNA and 16S rRNA fingerprints

Horizontal and vertical complexity of attached and free‐living bacteria of the eastern Mediterranean Sea, determined by 16S rDNA and 16S rRNA fingerprints

Analysis of the community structure of abyssal kinetoplastids revealed similar communities at larger spatial scales

Methods of sampling and analysis and our concepts of ocean dynamics

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