Article: Size and density of upside-down jellyfish, Cassiopea sp., and their impact on benthic fluxes in a Caribbean lagoon
Marine environmental research. 2020 Feb., v. 154
2020
Abstract: Anthropogenic disturbances may be increasing jellyfish populations globally. Epibenthic jellyfish are ideal organisms for studying this phenomenon due to their sessile lifestyle, broad geographic distribution, and prevalence in near-shore coastal ... ...
| Abstract | Anthropogenic disturbances may be increasing jellyfish populations globally. Epibenthic jellyfish are ideal organisms for studying this phenomenon due to their sessile lifestyle, broad geographic distribution, and prevalence in near-shore coastal environments. There are few studies, however, that have documented epibenthic jellyfish abundance and measured their impact on ecological processes in tropical ecosystems. In this study, the density and size of the upside-down jellyfish (Cassiopea spp.) were measured in Codrington Lagoon, Barbuda. A sediment core incubation study, with and without Cassiopea, also was performed to determine their impact on benthic oxygen and nutrient fluxes. Densities of Cassiopea were 24–168 m−2, among the highest reported values in the literature. Under illuminated conditions, Cassiopea increased oxygen production >300% compared to sediment alone, and they changed sediments from net heterotrophy to net autotrophy. Cassiopea increased benthic ammonium uptake, but reduced nitrate uptake, suggesting they can significantly alter nitrogen cycling. Future studies should quantify the abundance of Cassiopea and measure their impacts on ecosystem processes, in order to further determine how anthropogenic-related changes may be altering the function of tropical coastal ecosystems. |
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| Keywords | ammonium ; anthropogenic activities ; autotrophs ; coastal ecosystems ; environmental impact ; geographical distribution ; lifestyle ; nitrates ; nitrogen cycle ; oxygen ; oxygen production ; Scyphozoa ; sediments ; Antigua and Barbuda ; Caribbean |
| Language | English |
| Dates of publication | 2020-02 |
| Publishing place | Elsevier Ltd |
| Document type | Article |
| ZDB-ID | 1502505-6 |
| ISSN | 1879-0291 ; 0141-1136 |
| ISSN (online) | 1879-0291 |
| ISSN | 0141-1136 |
| DOI | 10.1016/j.marenvres.2019.104845 |
| Database | NAL-Catalogue (AGRICOLA) |
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