Details zur Publikation |
| Kategorie | Textpublikation |
| Referenztyp | Zeitschriften |
| DOI | 10.1186/s13717-023-00462-9 |
Lizenz  |
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| Titel (primär) | The impact of salps (Salpa thompsoni) on the Antarctic krill population (Euphausia superba): an individual-based modelling study |
| Autor | Pietzsch, B.W.; Schmidt, A.; Groeneveld, J.; Bahlburg, D.; Meyer, B.; Berger, U. |
| Quelle | Ecological Processes |
| Erscheinungsjahr | 2023 |
| Department | OESA |
| Band/Volume | 12 |
| Seite von | art. 50 |
| Sprache | englisch |
| Topic | T5 Future Landscapes |
| Supplements | https://static-content.springer.com/esm/art%3A10.1186%2Fs13717-023-00462-9/MediaObjects/13717_2023_462_MOESM1_ESM.pdf https://static-content.springer.com/esm/art%3A10.1186%2Fs13717-023-00462-9/MediaObjects/13717_2023_462_MOESM2_ESM.pdf |
| Keywords | Euphausia superba; Salpa thompsoni; Individual-based model; Food competition; Population dynamics; DEB theory |
| Abstract | Background Krill (Euphausia superba) and salps (Salpa thompsoni) are key macrozooplankton
grazers in the Southern Ocean ecosystem. However, due to differing habitat
requirements, both species previously exhibited little spatial overlap. With
ongoing climate change-induced seawater temperature increase and regional sea
ice loss, salps can now extend their spatial distribution into historically
krill-dominated areas and increase rapidly due to asexual reproduction when
environmental conditions are favorable. Understanding the potential effects on
krill is crucial, since krill is a species of exceptional trophic significance
in the Southern Ocean food web. Negative impacts on krill could trigger
cascading effects on its predators and prey. To address this question, we
combined two individual-based models on salps and krill, which describe the
whole life cycle of salp individuals and the dynamic energy budget of
individual krill. The resulting new model PEKRIS (PErformance of KRIll vs.
Salps) simulates a krill population for 100 years under varying
chlorophyll-a concentrations in the presence or absence of salps.
Results All of the investigated krill population properties (abundance, mean length, and yearly egg production) were significantly impacted by the presence of salps. On the other hand, salp density was not impacted if krill were present. The medians of krill population properties deviated during variable maximum chlorophyll-a density per year when salps were introduced by − 99.9% (− 234 individuals per 1000 m3) for krill density, − 100% (− 22,062 eggs per 1000 m3) for krill eggs and − 0.9% (− 0.3 mm) for mean length of krill. Conclusions If both species compete for the same food resource in a closed space, salps seem to inhibit krill populations. Further simulation studies should investigate whether this effect prevails if different phytoplankton sizes and consumption preferences of krill are implemented. Furthermore, direct predation of the two species or consumption of krill fecal pellets by salps could change the impact size of the food competition. |
| dauerhafte UFZ-Verlinkung | https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=28033 |
| Pietzsch, B.W., Schmidt, A., Groeneveld, J., Bahlburg, D., Meyer, B., Berger, U. (2023): The impact of salps (Salpa thompsoni) on the Antarctic krill population (Euphausia superba): an individual-based modelling study Ecol. Process. 12 , art. 50 10.1186/s13717-023-00462-9 |
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