AquaNISInformation system on aquatic non-indigenous and cryptogenic species |
Species | Penilia avirostris | |
Date of the first record (?) | 1997 References (not structured): www.frammandearter.se Hansson 2009. MARINA SYD-- SKANDINAVISKA ’EVERTEBRATER’’ -- etttt natturhiisttoriisktt urvall -- PRELIMINÄR (OILLUSTRERAD) UTGÅVA Sven Lovén centrum för marina vetenskaper, Tjärnö Web-upplaga 1 Nov. 2009 -: http://www.tmbl.gu.se/staff/HansGHanssonP.html |
Recipient region (?) | Country: Sweden LME: 22. North Sea |
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Source region (?) | Not entered |
Pathway / Vector (?) | Unknown References (not structured): www.frammandearter.se Comments: Unclear if spread by ballastwater or spread by natural expansion of habitat with warmer climat |
Habitat type (?) | Not entered | |
Wave exposure (?) | Not entered | |
Salinity range (?) | Not entered | |
Temperature range (?) | Not entered |
Zonation / Substratum (?) | Not entered | |
Reproductive duration (?) | Not entered | |
Reproductive seasonality (?) | Not entered | |
Migration pattern (?) | Not entered |
Population status (?) | Common (Moderate level of certainty) | |
Species status (?) | Cryptogenic References (not structured): Native according to dyntaxa.se Non-indenegous accordning to NOBANIS database Comments: In sweden first discovered in Koster in Skagerrak 1997, therafter a massoccurence in 2005 and 2006 in Kattegat. Unclear if spread by vessels or a natural expansion of their range. Kattegat; In the autumn 2001 a new cladoceran species Penilia avirostris was observed in plankton samples from Århus Bight and Kattegat (Ærtebjerg et al. 2002). This species has its main distribution in tropical and subtropical seas, where it at times dominates the mesozooplankton biomass. It feeds mostly on nanoplankton (2-20 µm) (Turner et al. 1988) and thus plays a different role in the pelagic food web than the other marine cladoceran species. Due to this P. avirostris may be an important link between bacterioplankton and higher consumers because of its predation on bacterivorous flagellates. P. avirostris was reported in the North Sea as early as 1948 and since 1999 it has been a steady component of the zooplankton community in the southern and eastern parts of the North Sea, typically in September/October. Since the first record in the North Sea it has spread progressively northward. For example it was found around Helgoland (Germany) in the early 1990s and was recorded in Koster Fjorden (Sweden) in 1997. In 2001 P. avirostris was observed in relatively low abundances of about 100 individuals m-3 in the Kattegat region, but in August-September 2002 it was among the dominating mesozoopankton species in the Sound with abundances up to 4000 individuals m-3 (Per Juel Hansen, pers comm). P. avirostris has the capacity to quickly build dense populations and significantly influence the food web structure and the fate of the primary production. Therefore it is important to follow closely the occurrence and development of this new, invasive species which is probably well established in Danish waters. |
Created by | Sergej Olenin |
Last update by | Ann-Britt Florin, 2015-11-10 |