Quantitative molecular detection of larval Atlantic herring (Clupea harengus) in stomach contents of Atlantic mackerel (Scomber scombrus) marks regions of predation pressure
| Autor: | Olav Sigurd Kjesbu, Richard D.M. Nash, Maik Tiedemann, Jessica Louise Ray, Frode Bendiksen Vikebø, Martina H. Stiasny, Erling Kåre Stenevik, Valeriya Komyakova, Arild Folkvord, Katrine Sandnes Skaar, Bridie J. M. Allan |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
Food Chain Molecular biology Science Oceans and Seas Population Dynamics Mackerel Zoology 010603 evolutionary biology 01 natural sciences Polymerase Chain Reaction Article Predation Herring Atlantic mackerel Animals Biomass Predator Scomber Marine biology Atlantic herring Multidisciplinary biology Norway 010604 marine biology & hydrobiology Clupea biology.organism_classification Gastrointestinal Contents Perciformes Larva Predatory Behavior Medicine Animal Migration Seasons |
| Zdroj: | Scientific Reports Scientific Reports, Vol 11, Iss 1, Pp 1-11 (2021) |
| Popis: | Mortality rates in the early life-history stages of fishes are generally high yet identifying the causes remain unclear. Faltering recruitment rates of Atlantic herring (Clupea harengus) in the Norwegian Sea indicate a need to identify which mortality factors influence larval herring survival. Previous research suggests that increased predation pressure by Atlantic mackerel (Scomber scombrus) may contribute to the disconnect between spawning stock biomass and recruitment. To quantify the contribution of predation pressure by Atlantic mackerel to herring larval mortality, two research cruises were conducted within a probable “hot spot” (67–72° N) for intensified mackerel predation based on particle drift simulations. Mackerel stomach contents were analysed for herring larvae content using droplet digital polymerase chain reaction (ddPCR) with a quantitative molecular detection assay specific for herring. The ddPCR results demonstrate clear predation by mackerel on herring larvae and also suggest that the alternative use of visual examination may give misleading results. Our results show that mackerel should be considered a potentially important predator on herring larvae. The quantitative molecular assay presented here shows great promise as an efficient and specific tool to correctly identify and quantify predation pressure on early life-history stages of fishes. |
| Databáze: | OpenAIRE |
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