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Invasive Species Details

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System : Marine
Kingdom Phylum Class Order Family Genus and species
Chromista Foraminifera Globothalamea Rotaliida Amphisteginidae Amphistegina lobifera Larsen, 1976
Common Name:

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Synonym:

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Summary:

The most abundant of the alien foraminifera species in the Mediterranean Sea is Amphistegina lobifera Larsen. It shows a wide distribution range in the Indo-Pacific and Atlantic Oceans (Langer and Hottinger 2000), and is also frequently recorded in the Eastern Mediterranean Basin, Israel (Langer and Hottinger 2000, Hyams et al. 2002, Gruber et al. 2007), Lebanon (Moncharmont Zei 1968), Greece (Cherif 1970) and Turkey (Avsar 1997, Meric et al. 2002, 2004). In Israel Amphistegina lobifera is the most abundant foraminifera species found in hard substrates, reaching densities of almost 180 specimens/g dry sediment and up to 700 specimens /g dry algae (Hyams et al. 2002, Gruber et al. 2007). It was recorded almost everywhere on the Aegean and Mediterranean coasts of Turkey, and even in the Sea of Marmara (Meric et al. 2005). It forms extensive, dense populations along the coasts of Antalya (SW Turkey) (Meric et al. 2002).

Type Description

A. lobifera is an oligotrophic largeforaminifer that bears diatom symbionts worldwide (REISS & HOTTINGER, 1984;HALLOCK, 1988; LANGER & HOTTINGER, 2000). 

Habitat

Amphistegina lobifera is continuously present from cm 0 -1 below the sea floor (bsf) to cm 14-15 bsf, with a characteristic decreasing abundance trend going back in time (Fig. 1). It is highly abundant (from 3.95 to 1.11 N g ) in the upper part of the core down to cm 6-7 bsf, and then it abruptly decreases in abundance down to cm 14 -15 bsf, where its lowest occurrence is recorded (0.28 N g ).

Reproductive Information

The reproduction period is short and is restricted to July and August, as evident by the high percentages of juveniles Light intensity and water temperature seems to regulate its reproduction cycle in the eastern Mediterranean. 

Lifecycle

Its numbers vary considerably indicating patchy distribution with somewhat higher numbers in late summer/early fall and late winter/early spring (650 specimens/g dry algae) and low numbers during summer (100 specimens/g dry algae). The reproduction period is short and is restricted to July and August, as evident by the high percentages of juveniles. Light intensity and water temperature seems to regulate its reproduction cycle in the eastern Mediterranean. Daily juvenile growth rate during summer is 2.2%, slowing during winter, at adult stage, to 0.3%. Full-sized specimens (up to 1.5mg) were recorded during fall and winter. A. lobifera is a major carbonate producing foraminifera, with a contribution of about 200 g CaCO3 m−2 yr−1on rocky coasts of Israel. In some samples it is the largest single contributor to carbonate production.

Nutrition Information

General Impact Information

The most abundant species is the hya-line A. lobifera Larsen, which is the dominantforaminifer on the coasts at the southern andcentral Aegean sites. According to Fig. 2b,the highest relative abundances were ob-served at the sampling sites of Kalamos andVravron where it composed 71.2% and 55.5%of the foraminiferal assemblages respectively.In the northern sites the species show a dra-matic abundance decline with very low fre-quencies (0.3% of the foraminiferal assem-blages at the sampling site of N. Kallikratia)or totally absent (Avdira and Katerini).

General Management Information

General Pathway Information

Suez Canal

Notes

References

"https://www.marinespecies.org/aphia.php?p=taxdetails&id=490083 TRIANTAPHYLLOU, M.V., KOUKOUSIOURA, O. and DIMIZA, M.D. (2009) ‘The presence of the Indo-Pacific symbiont-bearing Foraminifer Amphistegina lobifera in Greek coastal ecosystems (Aegean Sea, Eastern Mediterranean)’, Mediterranean Marine Science, 10(2), p. 73. doi:10.12681/mms.111. Gruber, Limor & Almogi-Labin, Ahuva & Herut, Barak. (2007). The life cycle of the symbiont-bearing larger foraminifera Amphistegina lobifera, a new arrival on the Israeli shelf. Rapports et procès-verbaux des réunions - Commission Internationale pour l'exploration scientifique de la Mer Méditerranée. 38. "

Yokes, M.B. et al. (2014) ‘The expanded population of Amphistegina lobifera at üç adalar and Beş Adalar (Antalya, Turkey)’, Marine Biodiversity Records, 7. doi:10.1017/s175526721400044x.

LOCATIONS

Seas or cities with distribution records for -

Name Description #
1 Üçadalar Detail

IMPACT INFORMATION

En yaygın tür, hyaline (saydam) A. lobifera Larsen'dir, ki bu tür Güney ve Orta Ege kıyılarındaki baskın foraminiferdir. Şekil 2b'ye göre, en yüksek göreceli yoğunluklar Kalamos ve Vravron örnekleme sitelerinde sırasıyla foraminifer topluluklarının %71.2'sini ve %55.5'ini oluşturduğu gözlemlenmiştir. Kuzey sitelerinde ise tür, çok düşük frekansta (N. Kallikratia örnekleme sitesinde foraminifer topluluklarının %0.3'ü) veya tamamen yok (Avdira ve Katerini) şeklinde dramatik bir yoğunluk azalması gösterir.

LOCATIONS

Üçadalar
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MANAGEMENT INFORMATION

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