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  • Eklöf, JohanStockholms universitet,Institutionen för ekologi, miljö och botanik (author)

Size matters : relationships between body size and body mass of common coastal, aquatic invertebrates in the Baltic Sea

  • Article/chapterEnglish2017

Publisher, publication year, extent ...

  • 2017-01-25
  • PeerJ,2017
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:su-141388
  • https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-141388URI
  • https://doi.org/10.7717/peerj.2906DOI
  • https://res.slu.se/id/publ/80509URI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • Background. Organism biomass is one of the most important variables in ecological studies, making biomass estimations one of the most common laboratory tasks. Biomass of small macroinvertebrates is usually estimated as dry mass or ash-free dry mass (hereafter `DM' vs. 'AFDM') per sample; a laborious and time consuming process, that often can be speeded up using easily measured and reliable proxy variables like body size or wet (fresh) mass. Another common way of estimating AFDM (one of the most accurate but also time-consuming estimates of biologically active tissue mass) is the use of AFDM/DM ratios as conversion factors. So far, however, these ratios typically ignore the possibility that the relative mass of biologically active vs. non-active support tissue (e.g., protective exoskeleton or shell)-and therefore, also AFDM/DM ratios-may change with body size, as previously shown for taxa like spiders, vertebrates and trees.Methods. We collected aquatic, epibenthic macroinvertebrates (>1 mm) in 32 shallow bays along a 360 km stretch of the Swedish coast along the Baltic Sea; one of the largest brackish water bodies on Earth. We then estimated statistical relationships between the body size (length or height in mm), body dry mass and ash-free dry mass for 14 of the most common taxa; five gastropods, three bivalves, three crustaceans and three insect larvae. Finally, we statistically estimated the potential influence of body size on the AFDM/DM ratio per taxon.Results. For most taxa, non-linear regression models describing the power relationship between body size and (i)DM and (ii) AFDM fit the data well (as indicated by low SE and high R-2). Moreover, for more than half of the taxa studied (including the vast majority of the shelled molluscs), body size had a negative influence on organism AFDM/DM ratios.Discussion. The good fit of the modelled power relationships suggests that the constants reported here can be used to quickly estimate organism dry-and ash-free dry mass based on body size, thereby freeing up considerable work resources. However, the considerable differences in constants between taxa emphasize the need for tax on specific relationships, and the potential dangers associated with ignoring body size. The negative influence of body size on the AFDM/DM ratio found in a majority of the molluscs could be caused by increasingly thicker shells with organism age, and/or spawning-induced loss of biologically active tissue in adults. Consequently, future studies utilizing AFDM/DM (and presumably also AFDM/wet mass) ratios should carefully assess the potential influence of body size to ensure more reliable estimates of organism body mass.

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  • Austin, Åsa N.Stockholms universitet,Institutionen för ekologi, miljö och botanik(Swepub:su)asni7959 (author)
  • Bergström, UlfSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för akvatiska resurser,Department of Aquatic Resources(Swepub:slu)50486 (author)
  • Donadi, SerenaStockholms universitet,Institutionen för ekologi, miljö och botanik,Stockholms universitets Östersjöcentrum,Stockholm University(Swepub:su)sdona (author)
  • Eriksson, Britas D. H. K. (author)
  • Hansen, JoakimStockholms universitet,Stockholms universitets Östersjöcentrum(Swepub:su)joha0876 (author)
  • Sundblad, GöranAquaBiota Water Research (author)
  • Stockholms universitetInstitutionen för ekologi, miljö och botanik (creator_code:org_t)
  • Sveriges lantbruksuniversitet

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