The invasive ctenophore Mnemiopsis leidyi poses no direct threat to Baltic cod eggs and larvae
Since its invasion in to the Baltic Sea in 2006, the ctenophore Mnemiopsis leidyi has been suspected of seriouspredation on the early life stages of Baltic cod (Gadus morhua callarias L.) due to a temporal and spatial overlap inthe most important cod spawning ground, the Bornholm Basin. We conducted...
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ftdtupubl:oai:pure.atira.dk:publications/fd334bd0-4ebb-4935-923a-763af5590140 2023-06-11T04:11:48+02:00 The invasive ctenophore Mnemiopsis leidyi poses no direct threat to Baltic cod eggs and larvae Jaspers, Cornelia Titelman, Josefin Hansson, Lars Johan Haraldsson, Matilda Ditlefsen, Christine Røllike 2011 application/msword https://orbit.dtu.dk/en/publications/fd334bd0-4ebb-4935-923a-763af5590140 https://backend.orbit.dtu.dk/ws/files/5896670/Jaspers_et_al_corrected%20last%20version%20before%20proof.doc https://backend.orbit.dtu.dk/ws/files/5896671/Jaspers%20et%20al_figures.doc eng eng info:eu-repo/semantics/closedAccess Jaspers , C , Titelman , J , Hansson , L J , Haraldsson , M & Ditlefsen , C R 2011 , ' The invasive ctenophore Mnemiopsis leidyi poses no direct threat to Baltic cod eggs and larvae ' , Limnology and Oceanography , vol. 56 , no. 2 , pp. 431-439 . article 2011 ftdtupubl 2023-04-26T22:54:46Z Since its invasion in to the Baltic Sea in 2006, the ctenophore Mnemiopsis leidyi has been suspected of seriouspredation on the early life stages of Baltic cod (Gadus morhua callarias L.) due to a temporal and spatial overlap inthe most important cod spawning ground, the Bornholm Basin. We conducted laboratory incubation experimentsand video observations to quantify feeding rates on Baltic cod eggs and larvae. Ingestion rates increased with codlarvae concentrations up to 8 prey L21, beyond which ingestion remained constant. Neither Mnemiopsis size noregg concentration (1–16 prey L21) affected feeding rates on cod eggs. Observed feeding rates pooled from allexperiments conducted at nonsaturating prey concentrations were low, with the highest volume-specific clearanceon , 4.5-d-old yolk-sac larvae (0.05 6 0.02 L (mL Mnemiopsis)21 h21), and lower rates on 4.5–8-d-old larvae(0.02 6 0.02 L (mL Mnemiopsis)21 h21) and eggs (0.02 6 0.03 L (mL Mnemiopsis)21 h21). When offered Artemiasalina and cod eggs simultaneously, Mnemiopsis passively selected against cod eggs. Video recordings showed thateggs did not trigger the capture response that Mnemiopsis shows toward motile prey, and ingested eggs were oftenejected (88%, n 5 8). Applying our clearance rates to in situ abundances of cod eggs, larvae, and Mnemiopsis forthe peak of the spawning season, we demonstrate that the predation pressure of the invasive ctenophore isnegligible. We conclude that Mnemiopsis constitutes no direct threat to the Baltic cod population Article in Journal/Newspaper Gadus morhua Technical University of Denmark: DTU Orbit |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
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ftdtupubl |
language |
English |
description |
Since its invasion in to the Baltic Sea in 2006, the ctenophore Mnemiopsis leidyi has been suspected of seriouspredation on the early life stages of Baltic cod (Gadus morhua callarias L.) due to a temporal and spatial overlap inthe most important cod spawning ground, the Bornholm Basin. We conducted laboratory incubation experimentsand video observations to quantify feeding rates on Baltic cod eggs and larvae. Ingestion rates increased with codlarvae concentrations up to 8 prey L21, beyond which ingestion remained constant. Neither Mnemiopsis size noregg concentration (1–16 prey L21) affected feeding rates on cod eggs. Observed feeding rates pooled from allexperiments conducted at nonsaturating prey concentrations were low, with the highest volume-specific clearanceon , 4.5-d-old yolk-sac larvae (0.05 6 0.02 L (mL Mnemiopsis)21 h21), and lower rates on 4.5–8-d-old larvae(0.02 6 0.02 L (mL Mnemiopsis)21 h21) and eggs (0.02 6 0.03 L (mL Mnemiopsis)21 h21). When offered Artemiasalina and cod eggs simultaneously, Mnemiopsis passively selected against cod eggs. Video recordings showed thateggs did not trigger the capture response that Mnemiopsis shows toward motile prey, and ingested eggs were oftenejected (88%, n 5 8). Applying our clearance rates to in situ abundances of cod eggs, larvae, and Mnemiopsis forthe peak of the spawning season, we demonstrate that the predation pressure of the invasive ctenophore isnegligible. We conclude that Mnemiopsis constitutes no direct threat to the Baltic cod population |
format |
Article in Journal/Newspaper |
author |
Jaspers, Cornelia Titelman, Josefin Hansson, Lars Johan Haraldsson, Matilda Ditlefsen, Christine Røllike |
spellingShingle |
Jaspers, Cornelia Titelman, Josefin Hansson, Lars Johan Haraldsson, Matilda Ditlefsen, Christine Røllike The invasive ctenophore Mnemiopsis leidyi poses no direct threat to Baltic cod eggs and larvae |
author_facet |
Jaspers, Cornelia Titelman, Josefin Hansson, Lars Johan Haraldsson, Matilda Ditlefsen, Christine Røllike |
author_sort |
Jaspers, Cornelia |
title |
The invasive ctenophore Mnemiopsis leidyi poses no direct threat to Baltic cod eggs and larvae |
title_short |
The invasive ctenophore Mnemiopsis leidyi poses no direct threat to Baltic cod eggs and larvae |
title_full |
The invasive ctenophore Mnemiopsis leidyi poses no direct threat to Baltic cod eggs and larvae |
title_fullStr |
The invasive ctenophore Mnemiopsis leidyi poses no direct threat to Baltic cod eggs and larvae |
title_full_unstemmed |
The invasive ctenophore Mnemiopsis leidyi poses no direct threat to Baltic cod eggs and larvae |
title_sort |
invasive ctenophore mnemiopsis leidyi poses no direct threat to baltic cod eggs and larvae |
publishDate |
2011 |
url |
https://orbit.dtu.dk/en/publications/fd334bd0-4ebb-4935-923a-763af5590140 https://backend.orbit.dtu.dk/ws/files/5896670/Jaspers_et_al_corrected%20last%20version%20before%20proof.doc https://backend.orbit.dtu.dk/ws/files/5896671/Jaspers%20et%20al_figures.doc |
genre |
Gadus morhua |
genre_facet |
Gadus morhua |
op_source |
Jaspers , C , Titelman , J , Hansson , L J , Haraldsson , M & Ditlefsen , C R 2011 , ' The invasive ctenophore Mnemiopsis leidyi poses no direct threat to Baltic cod eggs and larvae ' , Limnology and Oceanography , vol. 56 , no. 2 , pp. 431-439 . |
op_rights |
info:eu-repo/semantics/closedAccess |
_version_ |
1768387118910930944 |