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    Population structure, growth and production of a recent brachiopod from the Chilean fjord region

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    Type
    Article
    Authors
    Baumgarten, Sebastian cc
    Laudien, Jürgen
    Jantzen, Carin
    Häussermann, Verena
    Försterra, Günter
    KAUST Department
    Red Sea Research Center (RSRC)
    Marine Science Program
    Date
    2013-12-04
    Online Publication Date
    2013-12-04
    Print Publication Date
    2014-12
    Permanent link to this record
    http://hdl.handle.net/10754/563142
    
    Metadata
    Show full item record
    Abstract
    Magellania venosa, the largest recent brachiopod, occurs in clusters and banks in population densities of up to 416 ind m-2 in Comau Fjord, Northern Chilean fjord region. Below 15 m, it co-occurs with the mytilid Aulacomya atra and it dominates the benthic community below 20 m. To determine the question of why M. venosa is a successful competitor, the in situ growth rate of the brachiopod was studied and its overall growth performance compared with that of other brachiopods and mussels. The growth in length was measured between February 2011 and March 2012 after mechanical tagging and calcein staining. Settlement and juvenile growth were determined from recruitment tiles installed in 2009 and from subsequent photocensus. Growth of M. venosa is best described by the general von Bertalanffy growth function, with a maximum shell length (L∞) of 71.53 mm and a Brody growth constant (K) of 0.336 year-1. The overall growth performance (OGP index = 5.1) is the highest recorded for a rynchonelliform brachiopod and in the range of that for Mytilus chilensis (4.8-5.27), but lower than that of A. atra (5.74). The maximal individual production (PInd) is 0.29 g AFDM ind-1 year-1 at 42 mm shell length and annual production ranges from 1.28 to 89.25 g AFDM year-1 m-2 (1-57% of that of A. atra in the respective fjords). The high shell growth rate of M. venosa, together with its high overall growth performance may explain the locally high population density of this brachiopod in Comau Fjord. However, the production per biomass of the population (P/B--ratio) is low (0.535) and M. venosa may play only a minor role in the food chain. Settling dynamics indicates that M. venosa is a pioneer species with low juvenile mortality. The coexistence of the brachiopod and bivalve suggests that brachiopod survival is affected by neither the presence of potential brachiopod predators nor that of space competitors (i.e. mytilids).
    Citation
    Baumgarten, S., Laudien, J., Jantzen, C., Häussermann, V., & Försterra, G. (2013). Population structure, growth and production of a recent brachiopod from the Chilean fjord region. Marine Ecology, 35(4), 401–413. doi:10.1111/maec.12097
    Publisher
    Wiley
    Journal
    Marine Ecology
    DOI
    10.1111/maec.12097
    Relations
    Is Supplemented By:
    • [Dataset]
      Baumgarten, S., Laudien, J., Jantzen, C., Häussermann, V., & Försterra, G. (2015). Growth increments of the recent brachiopod Magellania venosa mechanically marked in Paso Comau and Comau Fjord, Chile, 2011/2012, supplement to: Baumgarten, Sebastian; Laudien, Jürgen; Jantzen, Carin; Häussermann, Verena; Försterra, Günter (2013): Population structure, growth and production of a recent brachiopod from the Chilean fjord region. Marine Ecology, 35(4), 401-413. PANGAEA - Data Publisher for Earth & Environmental Science. https://doi.org/10.1594/pangaea.845997. DOI: 10.1594/PANGAEA.845997 HANDLE: 10754/624120
    ae974a485f413a2113503eed53cd6c53
    10.1111/maec.12097
    Scopus Count
    Collections
    Articles; Red Sea Research Center (RSRC); Marine Science Program

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