Experimental feeding rates of gelatinous predators Aurelia aurita and Mnemiopsis leidyi at low northern Baltic Sea salinity
Artikel i vetenskaplig tidskrift, 2012

The effect of the northern Baltic Sea's low salinity on feeding rates of a native scyphozoan Aurelia aurita and a recent invader to southern Baltic Sea, ctenophore Mnemiopsis was investigated experimentally. Incubations with Acartia spp. prey (4.19-25.16 indiv. l(-1)) were used to estimate clearance rates for both predators. Mnentiopsis leidyi digestion times were measured for several natural prey items. Wet weight (ww):length/diameter relationships as well as clearance rates (0.49 +/- 0.15 1 g(ww)(-1) h(-1) [mean +/- SE] for M. leidyi [mean oral-aboral length +/- SD = 9.6 +/- 1.5 mm]; and 0.18 +/- 0.07 1 g(ww)(-1) h(-1) [mean +/- SE] for A. aurita [mean bell diameter SD = 37.3 +/- 6.9 mm]) and digestion times at salinity 5.7 were within the ranges reported from higher salinities. These preliminary results suggest that the low salinity does not significantly depress the feeding rates or potential predatory impact of these gelatinous predators.

predators

sarsia-tubulosa

ctenophore mnemiopsis

low dissolved-oxygen

pelagic cnidarians

black-sea

clearance rates

common jellyfish

planktonic

narragansett bay

ingestion-rate

Författare

A. Hosia

Lena Granhag

Göteborgs universitet

T. Katajisto

M. Lehtiniemi

Boreal Environment Research

1239-6095 (ISSN)

Vol. 17 6 473-483

Ämneskategorier

Biologiska vetenskaper