Gut Content Analyis of Zooplankton in the Indian Ocean, 2014-2015

• Other Authors: AADC (originator), AU/AADC > Australian Antarctic Data Centre, Australia (resourceProvider)
• Format: Dataset
• Language: unknown
• Published: Australian Ocean Data Network
• Subjects: biota; oceans; ZOOPLANKTON; EARTH SCIENCE; BIOSPHERE; AQUATIC ECOSYSTEMS; PLANKTON; PHYTOPLANKTON; BIOLOGICAL CLASSIFICATION; PROTISTS; FLUORESCENCE MICROSCOPY; R/V UM > R/V UMITAKA MARU; SHIPS; ACE/CRC; AMD/AU; CEOS; AMD; GEOGRAPHIC REGION > POLAR; OCEAN > SOUTHERN OCEAN; INDIAN OCEAN; Indian; Southern Ocean
• Online Access: https://researchdata.edu.au/gut-content-analyis-2014-2015/1702824; https://data.aad.gov.au/metadata/records/AAS_4331_Zooplankton_Gut_Contents; https://data.aad.gov.au/eds/5247/download; https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=AAS_4331; https://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4331_Zooplankton_Gut_Contents

No problems were encountered with the collection of these data. We studied the gut contents of four dominant copepod species (Calanoides acutus, Calanus propinquus, Calanus simillimus and Rhincalanus gigas) during the summer (2014-2015) along a latitudinal gradient (sampled every 5° between 40°S and 65°S) in the Indian sector of the SO. Diatoms were the most abundant food item found in the guts, comprising 24 of the 25 species found, and 15 were common to the four species of copepod studied. Diatoms accounted for the lowest proportion of the diet in the warmer, northern waters while all the large diatoms (e.g. Chaetoceros atlanticus, C. criophilus, C. dichaeta, Corethron spp.) were only found at 65oS. The most frequent species in the guts were the centric diatoms Thalassiosira spp. (4 to 57%) and the pennate diatoms Fragilariopsis kerguelensis (27 to 80%) and Trichoctoxon reinboldii (2 to 50%); proportions varied within a species across locations. These species were found at all sites examined, whereas some diatoms were specific to one copepod species: Asteromphalus spp. (in R. gigas), C. criophilus and C. dichaeta (in C. acutus), Nitzschia lecointei and N. sicula (in C. propinquus). The aim of this study was to understand the diet of key copepod species (Calanoides acutus, Calanus simillimus, Calanus propinquus and Rhincalanus gigas) of the Indian sector of the Southern Ocean across a latitudinal transect (40°S to 65°S) during the summer 2015.