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Impact of extreme climate and bioinvasion on temporal coupling of spring herring (Clupea harengus m.) larvae and their prey
Arula, T.; Ojaveer, H.; Klais, R. (2014). Impact of extreme climate and bioinvasion on temporal coupling of spring herring (Clupea harengus m.) larvae and their prey. Mar. Environ. Res. 102: 102-109.
In: Marine Environmental Research. Applied Science Publishers: Barking. ISSN 0141-1136; e-ISSN 1879-0291, more
Also appears in:
Kennedy, R.; Allcock, L.; Firth, L.; Power, A.M. (Ed.) (2014). Managing Biodiversity in a Changing Ocean. Proceedings of the 48th European Marine Biology Symposium (EMBS), Galway, Ireland, 19-23 August 2013. Marine Environmental Research, 102(Special Issue). Elsevier: Amsterdam. 130 pp., more
Peer reviewed article  

Available in  Authors 

    Clupea harengus Linnaeus, 1758 [WoRMS]; Copepoda [WoRMS]
Author keywords
    Baltic Sea; Coastal zone; Extreme hydro-climate; Copepod nauplii; Non-native predator; Clupea harengus membras larvae

Authors  Top 
  • Arula, T.
  • Ojaveer, H.
  • Klais, R.

    We used weekly observational data from mid-May to end of July in 1958–2012 in Gulf of Riga to investigate temporal coupling between spring herring larvae and their first prey – copepod nauplii, under the extreme hydroclimatic conditions. We focused on a small shallow estuary that is important nursery ground for larvae of the Gulf of Riga (Baltic Sea) herring population. We quantified the effect of extreme values of the winter air temperatures, time of ice retreat and spring water temperatures on the timing of peak abundance of herring larvae and copepod nauplii. We also assessed whether the invasion of the non-native cladoceran Cercopagis pengoi had notable effect on timing and abundance of copepod nauplii during the peak occurrence of herring larvae. In the years of earliest ice retreat the peak abundance of herring larvae was five weeks earlier than in the years of latest ice retreat, while the timing of nauplii remained unchanged. Abundant presence of the C. pengoi affected neither timing nor maximum abundance of copepod nauplii during the herring larvae first feeding period. Thus, we conclude that processes induced by climate variability are superior to invasion of C. pengoi in determining the timing and coupling of larval herring and copepod nauplii.

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