The invasive ctenophore Mnemiopsis leidyi poses no direct threat to Baltic cod eggs and larva
Since its invasion in to the Baltic Sea in 2006, the ctenophore Mnemiopsis leidyi has been suspected of serious predation on the early life stages of Baltic cod ( Gadus morhua callarias L.) due to a temporal and spatial overlap in the most important cod spawning ground, the Bornholm Basin. We conduc...
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crwiley:10.4319/lo.2011.56.2.0431 2024-04-21T08:02:19+00:00 The invasive ctenophore Mnemiopsis leidyi poses no direct threat to Baltic cod eggs and larva Jaspers, Cornelia Titelman, Josefin Hansson, Lars Johan Haraldsson, Matilda Ditlefsen, Christine Røllike 2011 http://dx.doi.org/10.4319/lo.2011.56.2.0431 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2011.56.2.0431 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2011.56.2.0431 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Limnology and Oceanography volume 56, issue 2, page 431-439 ISSN 0024-3590 1939-5590 Aquatic Science Oceanography journal-article 2011 crwiley https://doi.org/10.4319/lo.2011.56.2.0431 2024-03-26T09:19:05Z Since its invasion in to the Baltic Sea in 2006, the ctenophore Mnemiopsis leidyi has been suspected of serious predation on the early life stages of Baltic cod ( Gadus morhua callarias L.) due to a temporal and spatial overlap in the most important cod spawning ground, the Bornholm Basin. We conducted laboratory incubation experiments and video observations to quantify feeding rates on Baltic cod eggs and larvae. Ingestion rates increased with cod larvae concentrations up to 8 prey L −1 , beyond which ingestion remained constant. Neither Mnemiopsis size nor egg concentration (1–16 prey L −1 ) affected feeding rates on cod eggs. Observed feeding rates pooled from all experiments conducted at nonsaturating prey concentrations were low, with the highest volume‐specific clearance on < 4.5‐d‐old yolk‐sac larvae (0.05 ± 0.02 L (mL Mnemiopsis ) −1 h −1 ), and lower rates on 4.5‐8‐d‐old larvae (0.02 ± 0.02 L (mL Mnemiopsis ) −1 h −1 ) and eggs (0.02 ± 0.03 L (mL Mnemiopsis ) −1 h −1 ). When offered Artemia salina and cod eggs simultaneously, Mnemiopsis passively selected against cod eggs. Video recordings showed that eggs did not trigger the capture response that Mnemiopsis shows toward motile prey, and ingested eggs were often ejected (88%, n = 8). Applying our clearance rates to in situ abundances of cod eggs, larvae, and Mnemiopsis for the peak of the spawning season, we demonstrate that the predation pressure of the invasive ctenophore is negligible. We conclude that Mnemiopsis constitutes no direct threat to the Baltic cod population. Article in Journal/Newspaper Gadus morhua Wiley Online Library Limnology and Oceanography 56 2 431 439 |
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English |
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Aquatic Science Oceanography |
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Aquatic Science Oceanography 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 larva |
topic_facet |
Aquatic Science Oceanography |
description |
Since its invasion in to the Baltic Sea in 2006, the ctenophore Mnemiopsis leidyi has been suspected of serious predation on the early life stages of Baltic cod ( Gadus morhua callarias L.) due to a temporal and spatial overlap in the most important cod spawning ground, the Bornholm Basin. We conducted laboratory incubation experiments and video observations to quantify feeding rates on Baltic cod eggs and larvae. Ingestion rates increased with cod larvae concentrations up to 8 prey L −1 , beyond which ingestion remained constant. Neither Mnemiopsis size nor egg concentration (1–16 prey L −1 ) affected feeding rates on cod eggs. Observed feeding rates pooled from all experiments conducted at nonsaturating prey concentrations were low, with the highest volume‐specific clearance on < 4.5‐d‐old yolk‐sac larvae (0.05 ± 0.02 L (mL Mnemiopsis ) −1 h −1 ), and lower rates on 4.5‐8‐d‐old larvae (0.02 ± 0.02 L (mL Mnemiopsis ) −1 h −1 ) and eggs (0.02 ± 0.03 L (mL Mnemiopsis ) −1 h −1 ). When offered Artemia salina and cod eggs simultaneously, Mnemiopsis passively selected against cod eggs. Video recordings showed that eggs did not trigger the capture response that Mnemiopsis shows toward motile prey, and ingested eggs were often ejected (88%, n = 8). Applying our clearance rates to in situ abundances of cod eggs, larvae, and Mnemiopsis for the peak of the spawning season, we demonstrate that the predation pressure of the invasive ctenophore is negligible. 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 |
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 larva |
title_short |
The invasive ctenophore Mnemiopsis leidyi poses no direct threat to Baltic cod eggs and larva |
title_full |
The invasive ctenophore Mnemiopsis leidyi poses no direct threat to Baltic cod eggs and larva |
title_fullStr |
The invasive ctenophore Mnemiopsis leidyi poses no direct threat to Baltic cod eggs and larva |
title_full_unstemmed |
The invasive ctenophore Mnemiopsis leidyi poses no direct threat to Baltic cod eggs and larva |
title_sort |
invasive ctenophore mnemiopsis leidyi poses no direct threat to baltic cod eggs and larva |
publisher |
Wiley |
publishDate |
2011 |
url |
http://dx.doi.org/10.4319/lo.2011.56.2.0431 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2011.56.2.0431 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2011.56.2.0431 |
genre |
Gadus morhua |
genre_facet |
Gadus morhua |
op_source |
Limnology and Oceanography volume 56, issue 2, page 431-439 ISSN 0024-3590 1939-5590 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.4319/lo.2011.56.2.0431 |
container_title |
Limnology and Oceanography |
container_volume |
56 |
container_issue |
2 |
container_start_page |
431 |
op_container_end_page |
439 |
_version_ |
1796942530157215744 |