Appendicularia (Tunicata) in an Antarctic Glacial Fjord–Chaotic Fjordic Structure Community or Good Indicators of Oceanic Water Masses?

• Published in: Diversity
• Main Authors: Anna Panasiuk, Marcin Kalarus
• Format: Article in Journal/Newspaper
• Language: English
• Published: MDPI AG 2021
• Subjects: larvaceans; Antarctica (Admiralty Bay); species diversity and abundance; environmental conditions; Biology (General); QH301-705.5; Antarctic; King George Island; Admiralty Bay; Antarc*; Antarctica
• Online Access: https://doi.org/10.3390/d13120675; https://doaj.org/article/ffd5b459826642f9bb3bb615fc29b951

Appendicularians are important but remain poorly studied groups of zooplankton in polar regions. The present research is based on samples collected in Admiralty Bay (King George Island) during a year-long period. Six larvacean species were noted, among which Fritillaria borealis and Oikopleura gaussica were found to be the most numerous, while the other species were relatively rare. Fritillaria borealis was a dominant part of the late summer (warm water) community, while O. gaussica had the highest presence in the winter (cold water) community. The abundance of appendicularians recorded in the bay was less numerous than that described by other authors. The most important factors influencing annual changes in the larvaceans in the bay was season, but only in the case of the two species. These facts were probably linked to the very dynamic changes in the abiotic conditions in the fjord, and the influx of specific masses of water.