Geodia barretti

Geodia barretti is a massive deep-sea sponge species found in the boreal waters of the North Atlantic Ocean,[1] and is fairly common on the coasts of Norway and Sweden. It is a dominant species in boreal sponge grounds.[2][3] Supported by morphology and molecular data, this species is classified in the family Geodiidae.[4]

Geodia barretti
Scientific classification
Kingdom: Animalia
Phylum: Porifera
Class: Demospongiae
Order: Tetractinellida
Family: Geodiidae
Genus: Geodia
Species:
G. barretti
Binomial name
Geodia barretti
Bowerbank, 1858
Synonyms
  • Cydonium barretti
  • Geodia simplicissima

Morphology[1]

External morphology
G. barretti section. The depression (= preoscule) is filled with small oscules. The cortex is conspicuous.

Massive sponge, often irregularly lobate, whitish to light yellow color. The inside is light brown. Surface is smooth. Oscules are grouped in more or less shallow depressions (= preoscules) while pores are spread over the whole body. There is a distinct cortex about 0.5 mm thick, it is made of ball-shaped spicules called sterrasters.

Megascleres.
  • Oxeas (1000-5000 µm).
  • Dichotriaenes with rhabdomes up to 5000 µm long (more rarely orthotriaenes).
  • Anatriaenes.
  • Meso/protriaenes (rare).

Microscleres.
  • Microxeas (190-900 µm), sometimes slightly centrotylote.
  • Sterrasters (50-130 µm).
  • Oxyasters I (30-80 µm), microspined branches, only found in some specimens living > 1000 m.
  • Oxyasters II (6-33 µm), microspined branches.
  • Strongylasters (3-11 µm), microspined branches.

Genetics

DNA barcodes

Genomics

One meta-transcriptome was obtained by pyrosequencing from a specimen collected south of Bergen (Norway) in 2007.[6] Double-stranded cDNA was sequenced on a GF FLX sequencer (Roche Applied Sciences/454 Life Sciences, Barnford, CT). rRNA ribo-tags revealed a microsymbiont community, dominated by group SAR202 of Chloroflexi, candidate phylum Poribacteria and Acidobacteria. The most abundant mRNAs coded for key metabolic enzymes of nitrification from ammonia-oxidizing Archaea as well as candidate genes involved in related processes.

Systematics

Etymology

This sponge was named in honor of one of its discoverers, the biologist Lucas Barrett (1837-1862).

Vernacular names

This sponge is called "rutabaga sponge" in Norwegian (kålrabisvamp) and "football sponge" in Swedish (fotbollssvampdjur).

Type material

This sponge was collected by biologists Robert McAndrew and Lucas Barrett in 1855 on the South side of Vikna Island (formerly called Vigten or Vikten Island), North-Trøndelag, Norway, at a depth of 183 meters. It was later described by the British sponge taxonomist James Scott Bowerbank in 1858.

Drawing of the holotype of G. barretti (Bowerbank, 1872a: plate XI).

The holotype is a dry specimen stored at the Natural History Museum in London with the museum number BNHM 1877.5.21.1399. There are also slides of the holotype: BNHM 1877.5.21.1400 (one slide of surface and one spicule preparation) and BNHM 1877.5.21.1401 (slide of a section).

Phylogenetic relationships

According to morphology and molecular data, this species belongs to the family Geodiidae and to the genus Geodia.[4] It also seems to belong to a clade of Geodia species that all have their oscules in depressions (including Geodia megastrella, Geodia hentscheli).[7] This Geodia clade was given a PhyloCode name: Depressiogeodia.[4]

Distribution
G. barretti known distribution in the North Atlantic (as of 2015).

Biogeography

G. barretti is present throughout the boreal waters of the North Atlantic,[1] where water temperature is usually 3-9 degrees Celsius. This species is present on the Swedish west coast[8] and all along the Norwegian coast and Svalbard.[9]

One single specimen was formally recorded from the Mediterranean Sea, in the ‘Canyon des Moines’ (south Corsica), at 167 m (water temperature was 13 °C).[1] Deeper specimens (1100-1700 meter depths) were also recorded off the Atlantic coast of Morocco (Ibero-Moroccan Gulf).[1] Several deep specimens were collected on the mid-Atlantic ridge at 1650 m depth.[10]

Bathymetry

It is found from 30 to 2000 meter depths.[1] Most North-East Atlantic records are from the continental margins, between 200 and 500 m. In the North-West Atlantic (Grand Banks, Flemish Cap, Nova Scotia, and Davis Strait), it has been recorded between 410 and 1852 meter depths. Shallow specimens are common along the Norwegian coast,[11] especially in fjords.

Biology

Reproduction

G. barretti is an oviparous species with separated males and females.[12] The reproductive cycle is annual with one or two events of gamete release per year. The larvae has never been observed. Asexual reproduction has never been formally described.

Predators

The sponge-feeding deep-sea chiton Hanleya nagelfar is often found on G. barretti in the North-East Atlantic.[13] The parasitic foraminiferan Hyrrokkin sarcophaga[14] is more rarely found living on G. barretti.

Associated macrofauna

G. barretti has less associated macrofauna than any of the other boreo-arctic Geodia species: only ten different species of epibionts were recorded vs. 62 for Geodia macandrewii.[15]

Microbiology

G. barretti is a high microbial abundance (HMA) sponge,[16] such that the mesohyl is essentially packed with microbes, and just a few sponge cells. It was calculated that the sponge itself (canals, choanocyte chambers and cells) represents only 5% of its total volume, the rest being microbes.[17]

Estimates of the number of bacteria in G. barretti are between 2.9x1011 [16] and 3.1x1011 [17] microbes/cm3 sponge.

Isolation and study of specific bacteria

Streptomyces sp. GBA 94-10, an actinobacteria, was isolated from a Norwegian G. barretti.[18] It was shown to be a close relative of the terrestrial Streptomyces albus J1074. The genome was fully sequenced (Genbank accession numbers CM002271- plasmid pGBA1 CM002272).

Actinoalloteichus fjordicus, an actinobacteria, was isolated and described in two Norwegian sponges (Antho dichotoma and G. barretti).[19] This actinobacteria genus has been found in terrestrial and marine habitats. This actinobacteria's genome was fully sequenced (Genbank accession numbers CP016077-plasmid CP016078).

Chemistry

The major compound of G. barretti, called barettin, was isolated in 1986 at Uppsala University, Sweden; it had a clear antifouling activity. Since then, two more barettins were discovered, as well as other small molecules (see Table below). More recently, peptides called barrettides were found and published in 2015.

Compounds isolated from Geodia barretti
Compound Type of compound Discovered/described by Biactivities Structure
barettin diketopiperazine (monobrominated) Lidgren, Bohlin and Bergman (1986)[20]
  • antifouling[21]
  • selective 5-HT ligands[22]
  • antioxidant[23]
  • anti-inflammatory[23][24]
  • Inhibitor of electric eel acetylcholinesterase[25]
  • NOT antitumoral[23]
m/z 419,0826 [M+H]+
8,9-dihydrobarettin diketopiperazine (monobrominated) Sjögren, Göransson, Johnson, Dahlström, Andersson, Bergman, Jonsson and Bohlin (2004)[21]
  • antifouling[21]
  • selective 5-HT ligands[22]
  • inhibitor of electric eel acetylcholinesterase[25]
m/z 421,0982 [M+H]+
bromobenzisoxalone barettin diketopiperazine (dibrominated) Hedner, Sjögren, Fröndberg, Johansson, Göransson, Dahlström, Jonsson, Nyberg and Bohlin (2006)[22] antifouling[22]
m/z 648,0200 [M+H]+
geobarettin A diketopiperazine (monobrominated) Di, Rouger, Hardardottir, Freysdottir, Molinski, Tasdemir and Omarsdottir (2018)[26] NO anti-inflammatory activity[26]
m/z 451.0728 [M+H]+
geobarettin B diketopiperazine (monobrominated) Di, Rouger, Hardardottir, Freysdottir, Molinski, Tasdemir and Omarsdottir (2018)[26] anti-inflammatory activity[26]
m/z 417.0675 [M+H]+
geobarettin C indole (monobrominated) Di, Rouger, Hardardottir, Freysdottir, Molinski, Tasdemir and Omarsdottir (2018)[26] anti-inflammatory activity[26]
m/z 295.0440 [M]+
L-6-bromohypaphorine indole (monobrominated) Di, Rouger, Hardardottir, Freysdottir, Molinski, Tasdemir and Omarsdottir (2018)[26] Agonist of Human α7 Nicotinic Acetylcholine Receptor[27]
m/z 325.0550 [M+H]+
6-bromoconicamin indole (monobrominated) Olsen, Hansen, Moodie, Isaksson, Sepcic, Cergolj, Svenson and Andersen (2016)[25] inhibitor of electric eel acetylcholinesterase[25]
m/z 279.0491 [M]+
compound#4

(no formal name yet, it is 6-bromoconicamin with a hydroxyl group)

 indole

(monobrominated)

 Olsen, Hansen, Moodie, Isaksson, Sepcic, Cergolj, Svenson and Andersen (2016)[25] NO inhibition of electric eel acetylcholinesterase[25]
m/z 297.0586 [M]+
3-methylcytidine,

3-methyl-2’-deoxycytidine, 3-methyl-2’-deoxyuridine

 nucleoside Lidgren, Bohlin, and Christophersen (1988)[28] contractile activity

(3-mCyd, 3-mdCyd)[28]
histamine histidine derivative Lidgren, Bohlin, and Christophersen (1988)[28] contractile activity[28]
m/z 112.0869 [M+H]+
barrettides A-B peptides Carstens, Rosengren, Gunasekera, Schempp, Bohlin, Dahlström, Clark and Göransson (2015)[29] antifouling[29]

NOT antibacterial[29]
2-O-acetyl-1-O-hexadecylglycero-3-phosphocholine phosphocholine Olsen, Søderholm, Isaksson, Andersen and Hansen (2016)[30] antitumoral[30]
glycine betain

β-alanine betain

ɣ-aminobutyric acid betain

tetramethylammonium ion

 quaternary ammonium compounds Hougaard, Anthoni, Christophersen, Larsen and Nielsen (1991)[31]
sterols Hougaard, Christophersen, Nielsen, Klitgaard, and Tendal (1991)[32]
fatty acids Thiel, Blumenberg, Hefter, Pape, Pomponi, Reed, Reitner,

Wörheide and Michaelis (2002)[33]
free amino acids Hougaard, Christophersen, Nielsen, Klitgaard, and Tendal (1991)[32]

References
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  2. Klitgaard, A. B.; Tendal, O. S. (2004-04-01). "Distribution and species composition of mass occurrences of large-sized sponges in the northeast Atlantic". Progress in Oceanography. 61 (1): 57–98. Bibcode:2004PrOce..61...57K. doi:10.1016/j.pocean.2004.06.002.
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  33. Thiel, Volker; Blumenberg, Martin; Hefter, Jens; Pape, Thomas; Pomponi, Shirley; Reed, John; Reitner, Joachim; Wörheide, Gert; Michaelis, Walter (2002-02-01). "A chemical view of the most ancient metazoa – biomarker chemotaxonomy of hexactinellid sponges" (PDF). Naturwissenschaften. 89 (2): 60–66. Bibcode:2002NW.....89...60T. doi:10.1007/s00114-001-0284-9. ISSN 0028-1042.
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