Benthonic ostracods and deep watermasses: A qualitative comparison of Southwest Pacific, Southern and Atlantic Oceans

Ayress, Michael; Neil, Helen L; Passlow, V.; Swanson, Kerry

doi:10.1016/s0031-0182(97)00007-2

Cited by 58 publications

(26 citation statements)

References 20 publications

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“…The bathymetric distribution of selected ostracod species from the Kerguelen Plateau found in the present material was reported previously (Ayress et al, 1997). That paper indicated that there may be a correlation of the ostracod distributions & Gordon (1996) who concurred that the northern portion of the Polar Front is located near Kerguelen.…”

Section: Introductionsupporting

confidence: 83%

A taxonomic and distributional survey of marine benthonic Ostracoda off Kerguelen and Heard Islands, South Indian Ocean

Ayress¹,

Deckker

Coles³

2004

J. Micropalaeontol.

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-From an examination of 34 grab and dredge samples ranging from 110 m to 3584 m water depth, collected during Eltanin cruise 47 across the Kerguelen Plateau, 26 shallow-water and 35 deep-sea benthonic ostracod species have been identified. Systematic notes and illustrations of the common and some of the rare species are presented. Two new species are described: Philoneptunus cassidyi n. sp. and Taracythere abyssora n. sp. Comparisons made with the Atlantic and SW Pacific Oceans and circumAntarctic regions indicate that the fauna comprises dominantly cosmopolitan deep-sea species while most of the other species have close affinities with the SW Pacific. In the Kerguelen material, seven distinct depth assemblages appear to correspond well with differing watermasses and there is evidence that the relatively shallow position of Antarctic Intermediate Water permits elevation of the upper depth limits of some deep-sea species. Some species have developed ornament of fine reticulation, features not previously seen in those species outside the Kerguelen region.

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Section: Introductionsupporting

confidence: 83%

A taxonomic and distributional survey of marine benthonic Ostracoda off Kerguelen and Heard Islands, South Indian Ocean

Ayress¹,

Deckker

Coles³

2004

J. Micropalaeontol.

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“…Wherever possible we included splits of samples used by Weaver et al (1997) and Ayress et al (1997) in their studies of Recent planktic foraminifera and ostracods, respectively. We also included six seafloor short-core samples taken in a transect across the Chatham Rise as part of a detailed study of productivity and flux (Nodder et al 1999).…”

Section: Samplesmentioning

confidence: 99%

Depth distribution of Recent deep‐sea benthic foraminifera east of New Zealand, and their potential for improving paleobathymetric assessments of Neogene microfaunas

Hayward

Carter

Grenfell

et al. 2001

New Zealand Journal of Geology and Geophysics

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Paleobathymetric assessments of fossil foraminiferal faunas play a significant role in the analysis of the paleogeographic, sedimentary, and tectonic histories of New Zealand's Neogene marine sedimentary basins. At depths >100 m, these assessments often have large uncertainties. This study, aimed at improving the precision of paleodepth assessments, documents the present-day distribution of deep-sea foraminifera (>63 μm) in 66 samples of seafloor sediment at 90-4700 m water depth (outer shelf to mid-abyssal), east of New Zealand. One hundred and thirty-nine of the 465 recorded species of benthic foraminifera are new records for the New Zealand region.Characters of the foraminiferal faunas which appear to provide the most useful information for estimating paleobathymetry are, in decreasing order of reliability: relative abundance of common benthic species; benthic species associations; upper depth limits of key benthic species; and relative abundance of planktic foraminifera. Rmode cluster analysis on the quantitative census data of the 58 most abundant species of benthic foraminifera produced six species associations within three higher level clusters: (1) calcareous species most abundant at mid-bathyal to outer shelf depths (<1000 m); (2) calcareous species most abundant at mid-bathyal and greater depths (>600 m); (3) agglutinated species mostly occurring at deep abyssal depths (>3000 m). A detrended correspondence analysis ordination plot exhibits a strong relationship between these species associations and bathymetry. This is manifest in the bathymetric ranges of the relative abundance peaks of many of the common benthic species (e.g., Abditodentrix pseudothalmanni 500-2800 m, Bolivina robusta 200-650 m, Bulimina marginata f. marginata 20-600 m, B. marginata f. aculeata 400-3000 m, Cassidulina norvangi 1000-4500 m, Epistominella exigua 1000-4700 m, and Trifarina angulosa 10-650 m), which should prove useful in paleobathymetric estimates. G00057 Received 15 September 2000; accepted 27 July 2001The upper depth limits of 28 benthic foraminiferal species (e.g., Fursenkoina complanata 200 m, Bulimina truncana 450 m, Melonis affinis 550 m, Eggerella bradyi 750 m, and Cassidulina norvangi 1000 m) have potential to improve the precision of paleobathymetric estimates based initially on the total faunal composition. The planktic percentage of foraminiferal tests increases from outer shelf to upper abyssal depths followed by a rapid decline within the foraminiferal lysocline (below c. 3600 m). A planktic percentage <50% is suggestive of shelf depths, and >50% is suggestive of bathyal or abyssal depths above the CCD.In the abyssal zone there is dramatic taphonomic loss of most agglutinated tests (except some textulariids) at burial depths of 0.1-0.2 m, which negates the potential usefulness of these taxa in paleobathymetric assessments.

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“…In the last 10 years, there have been several studies of other plankton or microbenthic groups in bathyal to abyssal sediments in our study region, including planktic foraminifera (Weaver et al 1997;Barrows et al 2000), benthic foraminifera (Hayward et al 2002), ostracods (Ayress et al 1997), and dinoflagellate cysts . Transfer function or modern analogue techniques (MAT) have been applied to planktic foraminiferal assemblages to generate paleo-temperature estimates from fossil assemblages in several Quaternary sediment cores in the vicinity of the STF (Weaver et al 1998;Barrows et al 2000;Sikes et al 2002;Sabaa et al 2004).…”

Section: Oceanographic Setting and Related Studiesmentioning

confidence: 96%

Sedimentary record of radiolarian biogeography, offshore eastern New Zealand

Hollis¹,

Neil

2005

New Zealand Journal of Marine and Freshwater Research

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Examination of 38 surface sediment samples from offshore eastern New Zealand, between 33°S and 54°S, yielded 100 radiolarian taxa, which are common to abundant in sediments deposited at > 1000 m water depth but rare at shallower depths. In general, radiolarians are most abundant, most diverse, and best preserved in assemblages north of the Subtropical Front (STF). Multivariate analysis of census data for 29 radiolarian-rich samples identifies six sample groups and eight species groups. The STF forms a major biogeographic barrier, separating three transitional zone (TR) and three subantarctic zone (SA) sample groups. The three primary sample groups (TR1, TR2, SA1) record a southward latitudinal trend of decreasing abundance of subtropical-tropical or warm-water taxa (species group 4) and increasing abundance of subantarcticAntarctic or cool-water taxa (species groups 7 and 8). Two secondary sample groups (TR3 and SA2) may record the influence of shallow-water processes or strong surface currents on either side of the STF. low abundance and diversity, records relatively shallow, stratified, and silica-limited conditions of the central Campbell Plateau.

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Benthonic ostracods and deep watermasses: A qualitative comparison of Southwest Pacific, Southern and Atlantic Oceans

Cited by 58 publications

References 20 publications

A taxonomic and distributional survey of marine benthonic Ostracoda off Kerguelen and Heard Islands, South Indian Ocean

A taxonomic and distributional survey of marine benthonic Ostracoda off Kerguelen and Heard Islands, South Indian Ocean

Depth distribution of Recent deep‐sea benthic foraminifera east of New Zealand, and their potential for improving paleobathymetric assessments of Neogene microfaunas

Sedimentary record of radiolarian biogeography, offshore eastern New Zealand

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