Abstract
AB Aquatic Biology Contact the journal Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections AB 29:1-16 (2020) - DOI: https://doi.org/10.3354/ab00720 Temporal and spatial dynamics of the invasive red king crab and native brachyuran and anomuran larvae in Norwegian waters Helena Kling Michelsen*, Einar Magnus Nilssen, Torstein Pedersen, Camilla Svensen Department of Arctic and Marine Biology, UiT The Arctic University of Norway, 9019 Tromsø, Norway *Corresponding author: helena.k.michelsen@gmail.com ABSTRACT: This study investigates the temporal and spatial patterns of larval stages of the invasive red king crab Paralithodes camtschaticus (RKC) and co-existing native brachyurans and anomurans in a Norwegian fjord. It is one of few field studies describing the larval stage of native and invasive brachyurans and anomurans in the southern Barents Sea. Larvae were collected at 6 to 18 stations at roughly 1 to 2 mo intervals over a 1.5-yr period. To help explain timing in hatch of RKC larvae, the reproductive state of females was determined. The first larval stage of RKC was found in higher abundances in shallow bays, reflecting the spawning migrations of reproducing females. RKC was the first species among anomurans and brachyurans to release their larvae in Norwegian waters, and due to an extended larval release (January-May) their larvae occurred for the longest period of time in the water column. The native boreo-Arctic Pagurus pubescens and Hyas araneus released their larvae early in the year, starting in March. In contrast, larvae of the native boreal Pagurus bernhardus, Hyas coarctatus and Munida sp. were observed later in spring and summer. The combination of protracted hatching, high fecundity and high adult abundance of RKC are likely strong contributing factors to the species’ successful establishment in the southern Barents Sea and could favour the dispersal of RKC south along the Norwegian coast and potentially north into Arctic shelf areas. KEY WORDS: Paralithodes camtschaticus · Zoea · Pagurus · Hyas · Munida · Barents Sea · Biogeography · Invasive species Full text in pdf format Supplementary material NextCite this article as: Michelsen HK, Nilssen EM, Pedersen T, Svensen C (2020) Temporal and spatial dynamics of the invasive red king crab and native brachyuran and anomuran larvae in Norwegian waters. Aquat Biol 29:1-16. https://doi.org/10.3354/ab00720 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in AB Vol. 29. Online publication date: January 16, 2020 Print ISSN: 1864-7782; Online ISSN: 1864-7790 Copyright © 2020 Inter-Research.
Highlights
As is the case of many benthic invertebrates, brachyuran and anomuran decapods have a complex life cycle
The present study describes, for the first time, the temporal and spatial patterns of invasive red king crab Paralithodes camtschaticus (RKC) and co-existing native brachyuran and anomuran zoeae within a north Norwegian fjord
The brachyuran and anomuran zoeae collected in this study belong to native and invasive species residing in the southern Barents Sea (Barnes et al 2007, Zimina et al 2015)
Summary
As is the case of many benthic invertebrates, brachyuran and anomuran decapods have a complex life cycle. A majority of marine benthic brachyurans and anomurans brood their fertilized eggs under their abdominal flap and release pelagic zoeae (larvae) which, in high-latitude regions, spend several months in the water column before settling to the seafloor as juveniles. This early part of the life cycle is vulnerable to predation, starvation, unfavorable temperatures and salinities, and. Many aspects of the temporal and spatial dynamics of the RKC zoeal phase remain unknown, leading to uncertainties as to how well larval release is adapted to the new environment, the role this life phase can have as a bottleneck for recruitment, and its potential trophic role in the pelagic habitat (Anger 2006)
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