NDLI: Taxonomy, biogeography and ecology of quaternary Benthic Ostracoda (Crustacea) from circumpolar deep water of the Emerald Basin (Southern Ocean) and the S Tasman Rise (Tasman Sea)

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Taxonomy, biogeography and ecology of quaternary Benthic Ostracoda (Crustacea) from circumpolar deep water of the Emerald Basin (Southern Ocean) and the S Tasman Rise (Tasman Sea)

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Taxonomy, biogeography and ecology of quaternary Benthic Ostracoda (Crustacea) from circumpolar deep water of the Emerald Basin (Southern Ocean) and the S Tasman Rise (Tasman Sea)

Content Provider	Springer Nature Link
Author	Mazzini, Ilaria
Copyright Year	2005
Abstract	Benthic Ostracoda were recovered from 19 box core samples collected during the cruise SO 136 of the German R/VSONNE in the Tasman Sea and Southern Ocean (SW Pacific sector). The detailed taxonomic study of more than 10.000 specimens recovered from eleven box-corer samples from circumpolar deep water of the Emerald Basin (Southern Ocean) and the S Tasman Rise (Tasman Sea) led to the recognition of 34 genera and 63 species, of which 9 new to science. Additionally, ten key cosmopolitan and endemic taxa were re-studied and re-illustrated from type material from the Natural History Museum (London), the Utrecht Micropaleontological Collection, the Senckenberg Museum (Frankfurt) and the University of Canterbury (New Zealand).Oxygen and carbon isotopic values were measured on specimens from 17 samples from the Campbell Plateau and the S Tasman Rise. In particular, four podocopid ostracod genera were analysed: the in-faunalKrithe and die epifaunalFallacihowella, Poseidonamicus andBradleya. The stable isotopes proxies provided useful indications about the microhabitats, the diets and the temperature sensitivity of each tax-on. Additionally, different calcification rates and different microhabitats were claimed to explain the different isotopic signature of adults and juveniles ofKrithe.Statistical analyses were performed on the relative abundance in percentages of 73 species identified in 19 sediment samples. Both species (R-mode) and samples (Q-mode) were grouped by cluster analyses and detrended correspondence analyses (DCA) using the software package PAST (ver. 0.94).Q-mode cluster analyses partially supported the observations made by previous authors that the ostracod specific thresholds are controlled by the water mass characteristics. Q- and R-mode detrended correspondence analyses, on the contrary, indicated that distribution patterns must be driven by factors other than the water mass characteristics. Seven assemblages are recognised and the characteristic or most abundant species are discussed for their ecological demands. Bottom topography, sediment type, CaC0$_{3}$ content, and flux of organic carbon interplay with the water mass characteristics creating a complex network of ecological gradients. Within each of the identified assemblages the species specific thresholds are not identical and often the range of the ecological gradients of the most abundant species do not include that of the characteristic species. Most likely, dynamics of co-occurring species take place which could involve Ostracoda and other benthic animals belonging to the same trophic groupings.
Starting Page	1
Ending Page	119
Page Count	119
File Format	PDF
ISSN	0080889X
Journal	Marine Biodiversity
Volume Number	35
Issue Number	1
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-01-01
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	Quaternary Ostracoda Systematics Isotope Analyses Statistics Ecology Pacific Ocean Biodiversity Freshwater & Marine Ecology Plant Systematics/Taxonomy/Biogeography Animal Systematics/Taxonomy/Biogeography
Content Type	Text
Resource Type	Article
Subject	Aquatic Science Oceanography

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