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Bitte verwenden Sie diesen Link, wenn Sie dieses Dokument zitieren oder verlinken wollen: https://nbn-resolving.org/urn:nbn:de:gbv:9-opus-75389

On the Predation of Doliolids (Tunicata, Thaliacea) on calanoid Copepods

  • The main goal of this contribution was to determine the effect of predation of the often abundant to dominant doliolid Dolioletta gegenbauri (Tunicata, Thaliacea) on the abundance of co-occurring planktonic copepods by feeding on their eggs. Previous oceanographic investigations revealed that doliolids had ingested eggs of small calanoid copepods. The ecological significance of such feeding could not be quantified completely because the environmental abundance of such eggs was not known. In this study, the eggs and nauplii of the neritic calanoid Paracalanus quasimodo (Crustacea, Copepoda) were offered to gonozooids and phorozooids of D. gegenbauri with a 6–6.5 mm length together with three species of phytoplankton; i.e., simulating diet conditions on the shelf. We hypothesized that copepod eggs of a similar size as food particles would be readily ingested whereas small nauplii, which could escape, would hardly be eaten by the doliolids. Our results revealed that doliolids have the potential to control small calanoids by ingesting their eggs at high rates but not their nauplii or later stages. Late copepodid stages and adults of co-occurring calanoid species could cause less mortality because they prey less on such eggs than doliolids of a similar weight. However, certain abundant omnivorous calanoid species with pronounced perception and/or capture abilities can prey successfully on the nauplii of small calanoids.

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Metadaten
Author: Marion Köster, Gustav-Adolf Paffenhöfer
URN:urn:nbn:de:gbv:9-opus-75389
DOI:https://doi.org/10.3390/jmse10091293
ISSN:2077-1312
Parent Title (English):Journal of Marine Science and Engineering
Publisher:MDPI
Place of publication:Basel
Editor: Francesco Tiralongo
Document Type:Article
Language:English
Date of first Publication:2022/09/13
Release Date:2022/11/14
Tag:calanoid copepods; copepod eggs; doliolids; nauplii
GND Keyword:-
Volume:10
Issue:9
Article Number:1293
Page Number:11
Faculties:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Mikrobiologie - Abteilung für Genetik & Biochemie
Licence (German):License LogoCreative Commons - Namensnennung