Release of dissolved organic carbon (DOC) by the scyphozoan jellyfish Aurelia aurita and its potential influence on the production of planktic bacteria

Hansson, Lars Johan; Norrman, Bo

doi:10.1007/bf00349462

Cited by 88 publications

(75 citation statements)

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“…August 1996 when brief anoxia occurred in the layer below 35 m. It is possible that similar anoxic conditions appear regularly in VJ during periods of the strongest stratification, but because of short duration they can readily be missed. The formation of anoxic conditions is mostly related to bacterial activity and the decomposition of organic compounds (Azam et al, 1983), but presence of large numbers of Aurelia near the anoxic layer (Thuesen and Childress, 1994) could also be a substantial contributing factor (Hansson and Norrman, 1995). It is possible that marine snow also plays an important part in ecological processes of the lakes (Ott and Herndl, 1995).…”

Section: Discussionmentioning

confidence: 99%

Ecological characteristics of the Mljet Islands seawater lakes (South Adriatic Sea) with special reference to their resident populations of medusae

et al. 2000

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SUMMARY: Ecological properties and distribution and abundance of medusae were studied over an 18-month period in the Mljet Island seawater lakes, south-east Croatia. Strong stratification during the summer differentiates these lakes from the oligotrophic South Adriatic ecosystem. The lakes are designated as a moderately eutrophicated ecosystem. Very small numbers of hydromedusae were noted, representing only the Anthomedusae and Leptomedusae. A new species of the genus Tima was found in considerable numbers of individuals. High abundance of the scyphomedusa Aurelia sp. was observed throughout the year. This species differs in terms of genetic divergence from Aurelia aurita found elsewhere in the Mediterranean and could be attributed to the boreal origin.

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Section: Discussionmentioning

confidence: 99%

Ecological characteristics of the Mljet Islands seawater lakes (South Adriatic Sea) with special reference to their resident populations of medusae

et al. 2000

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“…Furthermore, the biomass of jellyfish generates a large amount of carbon-rich colloidal and dissolved organic matter (jelly-DOM) (Hansson and Norrman 1995) that is released into the water and easily available to the bacterioplankton (Carlson et al 2002;Condon and Steinberg 2008), with consequences for bacterial growth and enzymatic activities Titelman et al 2006). The protein-rich decay jellyfish biomass and the mucous excretion of living jellyfish also are readily assimilated by jellyfish-associated and free-living bacteria and can cause rapid shifts in microbiome structure and organization (Tinta et al 2010(Tinta et al , 2012.…”

Section: Introductionmentioning

confidence: 99%

The influence of invasive jellyfish blooms on the aquatic microbiome in a coastal lagoon (Varano, SE Italy) detected by an Illumina-based deep sequencing strategy

et al. 2014

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The rapid expansion of multicellular native and alien species outbreaks in aquatic and terrestrial ecosystems (bioinvasions) may produce significant impacts on bacterial community dynamics and nutrient pathways with major ecological implications. In aquatic ecosystems, bioinvasions may cause adverse effects on the water quality resulting from changes in biological, chemical and physical properties linked to significant transformations of the microbial taxonomic and functional diversity. Here we used an effective and highly sensitive experimental strategy, bypassing the efficiency bottleneck of the traditional bacterial isolation and culturing method, to identify changes of the planktonic microbial community inhabiting a marine coastal lagoon (Varano, Adriatic Sea) under the influence of an outbreakforming alien jellyfish species. Water samples were collected from two areas that differed in their level of confinement inside in the lagoon and jellyfish densities (W, up to 12.4 medusae m -3 ; E, up to 0.03 medusae m -3 ) to conduct a snapshot microbiome analysis by a metagenomic approach. After extraction of the genetic material in the environmental water samples, we deepsequenced metagenomic amplicons of the V5-V6 region of the 16S rRNA bacterial gene by an Illumina MiSeq platform. Experiments were carried out in Caterina Manzari, Bruno Fosso and Marinella Marzano have contributed equally to this work.Stefano Piraino and Graziano Pesole are senior authors.Electronic supplementary material The online version of this article (doi:10.1007/s10530-014-0810-2) contains supplementary material, which is available to authorized users. triplicates, so six libraries of dual indexed amplicons of 420 bp were successfully sequenced on the MiSeq platform using a 2 9 250 bp paired-end sequencing strategy. Approximately 7.5 million paired-end reads (i.e. 15 million total reads) were generated, with an average of 2.5 million reads (1.25 M pairs) per sample replicate. The sequence data, analyzed through a novel bioinformatics pipeline (BioMaS), showed that the structure of the resident bacterial community was significantly affected by the occurrence of jellyfish outbreaks. Clear qualitative and quantitative differences were found between the western and eastern areas (characterized by many or few jellyfish), with 84 families, 153 genera and 324 species in the W samples, and 104 families, 199 genera and 331 species in the E samples. Significant differences between the two sampling areas were particularly detected in the occurrence of 16 families, 22 genera and 61 species of microbial taxa. This is the first time that a NGS platform has been used to screen the impact of jellyfish bioinvasions on the aquatic microbiome, providing a preliminary assessment of jellyfish-driven changes of the functional and structural microbial biodiversity.

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“…Gelatinous zooplankton or jellyWsh (here considered as Phylum Cnidaria, Class Schyphozoa) have been viewed as peripheral and transient components within marine ecosystems, constituting little more than a carbon sink or a trophic dead end (Hansson and Norrman 1995;Arai 2005). This perception now appears outdated and international eVorts are underway to redress this long-standing gap in our knowledge (Mills 2001;Purcell and Arai 2001).…”

Section: Introductionmentioning

confidence: 99%

Preservation methods alter stable isotope values in gelatinous zooplankton: implications for interpreting trophic ecology

et al. 2011

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JellyWsh are increasingly topical within studies of marine food webs. Stable isotope analysis represents a valuable technique to unravel the complex trophic role of these long-overlooked species. In other taxa, sample preservation has been shown to alter the isotopic values of species under consideration, potentially leading to misinterpretation of trophic ecology. To identify potential preservation eVects in jellyWsh, we collected Aurelia aurita from Strangford Lough (54 o 22Ј44.73ЉN, 5 o 32Ј53.44ЉW) during May 2009 and processed them using three diVerent methods prior to isotopic analysis (unpreserved, frozen and preserved in ethanol). A distinct preservation eVect was found on 15 N values: furthermore, preservation also inXuenced the positive allometric relationship between individual size and 15 N values. Conversely, 13 C values remained consistent between the three preservation methods, conXicting with previous Wndings for other invertebrate, Wsh and mammalian species. These Wndings have implications for incorporation of jellyWsh into marine food webs and remote sampling regimes where preservation of samples is unavoidable.

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Release of dissolved organic carbon (DOC) by the scyphozoan jellyfish Aurelia aurita and its potential influence on the production of planktic bacteria

Cited by 88 publications

References 30 publications

Ecological characteristics of the Mljet Islands seawater lakes (South Adriatic Sea) with special reference to their resident populations of medusae

Ecological characteristics of the Mljet Islands seawater lakes (South Adriatic Sea) with special reference to their resident populations of medusae

The influence of invasive jellyfish blooms on the aquatic microbiome in a coastal lagoon (Varano, SE Italy) detected by an Illumina-based deep sequencing strategy

Preservation methods alter stable isotope values in gelatinous zooplankton: implications for interpreting trophic ecology

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