Table 1 - uploaded by Bruce W Hayward
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Samples from intertidal Zostera pool at Kawerua used in ostracod studies.
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... sample of Corallina turf (sample A) and three of sediment (samples B-D) taken from the upper 2 cm covering the bottom of the pool (Table 1) were collected in January 1979. The samples were preserved in 10% ethanol and on return to the laboratory were thoroughly washed over a 200 mesh sieve and dried. ...
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... The dominant representative phytal genera such as Hemicytherura, Paradoxostoma, and Xestoleberis are inadequate to estimate the paleo-water depth based on their autecological information because their valves are easily transported from their habitats (on seaweeds or seagrasses) to the seafloor after their death. Semicytherura costellata lives on the Corallina turf in the intertidal pools (Hayward, 1981), which is also not a useful species. Moreover, the autecology of Nealocythere antarctica remains uncertain. ...
Four sediment samples were collected from an outcrop of the Holocene-raised beach in Skarvsnes (Ltzow-Holm Bay, East Antarctica) at an elevation of 010 m through a geomorphological survey conducted during the 46th Japanese Antarctic Research Expedition (JARE 46). These samples were used for grain size, CNS (carbon, nitrogen, and sulfur) elemental, and ostracod analyses. The 14C dating of an annelid tube collected from the same outcrop was also conducted using an accelerator mass spectrometry. The resultant age was estimated at approximately 5,800 cal. year BP. A total of 16 ostracod species belonging to 10 genera were identified for the first time from all study samples near Lake Suribachi-Ike, LtzowHolm Bay, East Antarctica. The phytal species were found to be the most dominant, suggesting rich seagrass and/or seaweeds at that time. Autecological methods and modern analog technique of ostracod assemblages were used to estimate the paleoenvironment. The result from the modern analog technique suggested that the paleo-water depth of approximately 30 m at that time is the most probable estimation, implying the glacial-isostatic uplift of approximately 3040 m (5.16.8 mm/year) until sample date.
... We consider that this is a result of the greater diversity present in the warm Aupourian Province compared with cooler provinces further south around New Zealand and the greater diversity of habitat (sheltered fine sediment to current-swept gravel, proximity to rocks, brown seaweed forest and sea grass meadows) around the Cavalli Islands compared with other studied areas (e.g. Swanson 1979a, b;Hayward 1981Hayward , 1982bEagar 1995Eagar , 1999Morley et al. 2006;Morley and Hayward 2007, 2010, 2012. ...
One hundred and twelve species of marine ostracod are recorded from 0-29 m depth around the
Cavalli Islands, northeast Northland – the most diverse ostracod fauna from a relatively small
area (10 km2) documented so far from New Zealand. Thirty of these species are additions to the
known Recent (living) ostracod fauna of this country, although only ten have been identified to
named species – the Recent Australian species Callistocythere dorsotuberculata paucicostata,
Callistocythere keiji, Callistocythere ventroalata, Lankacythere coralloides, Neohornibrookella
lactea, Papillatabairdia elongata, Tasmanocypris dietmarkeyseri, Xestoleberis posidonicola,
Yassinicythere bassiounii and the fossil (early Miocene) New Zealand species Hemicythere
tarakohensis. This brings the total marine ostracod fauna in the New Zealand EEZ to 496 species,
of which 229 (46%) are recorded from shelf depths (0-200 m) in the Aupourian Province, east of
northern New Zealand.
Cluster analysis of 113 quantitative ostracod samples from inner-mid shelf depths east of
Northland and Auckland resulted in the recognition of 14 subassociations in 4 associations. The
majority of the Cavalli faunas cluster together in three subassociations with the most diverse faunas
and lowest species dominance, characterised by common Loxoconcha punctata. Subdominant
in the shallowest subassociation is Xestoleberis olivacea, whereas Neonesidea amygdaloides,
Quadracythere biruga and Ambostracon pumilum are subdominant in the other two subassociations
in coarser sediment in the current-swept Cavalli Passage. One distinctly different unclustered
Cavalli Islands ostracod fauna occurs in strong current-swept, shell gravel between rocky islets
at 9 m depth and is strongly dominated (48%) by Xestoleberis chilensis austrocontinentalis with
subdominant Polycope sp. and Parapolycope cf. loscobanosi.
... The dominant ostracod throughout both cores is Callistocythere neoplana, which in the interval of foraminiferal subgroup 1a is accompanied by small numbers of in situ Keija demissa, Loxoconcha punctata, and Procythereis densuireticulata. C. neoplana is common and widespread around New Zealand in normal salinity to slightly brackish exposed and sheltered environments from low tide to depths of 30 m (Swanson 1979;Hayward 1981; Morley unpublished observation). K. demissa is a common species in eastern Australia in current-swept intertidal and subtidal channels of estuaries and coastal lagoons (Yassini and Jones 1995) and also occurs in similar locations around northern New Zealand, where its greatest recorded abundance today is further down the Waitemata Harbor near the center of Auckland city (Morley unpublished observation). ...
Two short cores of late Holocene, low tidal, estuarine sediment from the sheltered fringes of the Auckland's Waitemata Harbor,
New Zealand, record the following changes through time since human colonization: an abrupt decline and disappearance of marine
molluscs, a major decline and virtual disappearance of ostracods, an abrupt decline in calcareous foraminifera (mostlyAmmonia spp.), a rapid increase, in abundance of agglutinated foraminifera, large diatoms, and freshwater thecamoebians, and an increase
in sedimentation rate, but no consistent trend in change of grain size. The up-core foraminiferal changes mimic their present
day up-estuary zonation, which correlates strongly with decreasing salinity and pH. In both localities the faunal changes
can be correlated with the documented local land-use history and increased freshwater runoff over time. At the head of the
Waitemata Harbor, in Lucas Creek estuary, three phases of foraminiferal faunal change occurred: minor changes during initial
Polynesian forest clearance (1500–1800 AD), a major change in early European times (1840–1870 AD) with clearance of most of
the remaining native forest, and another small change in very, recent times (∼1990s) with urbanization in the Lucas Creek
catchment. On the eastern, seaward fringes of the Waitemata Harbor, in the smaller Tamaki Estuary, no faunal changes occurred
in association with complete forest clearance and establishment of pastoral farming in Polynesian and early European times
(before 1950s). Major foraminiferal and other faunal changes occurred in the late European period (1960s–1970s) coincident
with the onset of major urbanization spreading throughout the Tamaki catchment. Our results suggest increased freshwater runoff
is the major culprit for many of the observed biotic changes in the urbanized estuaries of New Zealand.
... Studies on marine ostracod faunas around New Zealand are few. The only previous quantitative faunal study in the north was at Kawerua on the west coast of Northland (Hayward 1981b). Here two faunas were recognised -an in situ tide pool fauna dominated by Loxoconcha punctata with subdominant Xestoleberis olivacea, Hemicythere sp. and Ambostracon pumila and a displaced, exposed inner shelf fauna dominated by Kotoracythere sp. and Waiparacythereis joanae. ...
One hundred and twenty-nine species of foraminifera and forty-five species of ostracoda were found in five samples of nearshore sediment (clean medium sand, shelly medium sand, shelly very coarse sand) taken from 4-10 m depth off the south-western corner of Little Barrier Island, east coast of Northland. The foraminiferal faunas are dominated by Pileolina zealandica, Discorbis dimidiatus, Quinqueloculina seminula, Elphidium charlottensis, Textularia sp. and Rosalina irregularis. These Little Barrier faunas are notable however, for the low abundance of Cibicides marlboroughensis, C. corticatus, Elphidium novozealandicum, Notorotalia olsoni and Gaudryina convexa, which elsewhere in northern New Zealand are codominant with the species above in similar shallow water, clean sand or shelly sand in exposed or current-swept environments. The ostracod faunas are dominated by Callistocythere obtusa, Waiparacythereis joanae, Loxoconcha punctata, Aglaiocypris sp. and Xestoleberis olivacea, and in taxonomic composition are quite distinct from shallow water faunas previously described from the west coast of Northland. Three forminifera (Hauerina pacifica, Entomorphinoides cf. karenae, Spirillina denticulogranulata) and two ostracoda (Polycopsis cf. loscobanosi, Ponticocythereis militaris) are recorded from New Zealand for the first time.
This paper provides the fi rst account of the ecological distribution of Ostracoda from a New Zealand harbour. Fifty-eight species are recorded in 23 subtidal (0–30 m) and intertidal sand and mud samples from the Waitemata Harbour, Auckland. Five associations are recognised using cluster analysis on the percentage abundance counts of total valves (live plus dead specimens). The main harbour channel from Hobsonville to Rangitoto, together with some of the subtidal fl ats in the outer part of the harbour, is dominated by Keijia demissa, with subdominant Munseyella aequa and M. brevis below the harbour bridge (association A) and Callistocythere neoplana and Quadracythere mediaruga above the bridge (association B). Shallow subtidal mud fl ats in the inner harbour (Herne Bay to Pollen Island) are dominated by Munseyella tumida and Microcytherura ?hornibrooki (association C). Intertidal mud fl ats and mangrove forest at Pollen Island and in the upper harbour have an ostracod fauna strongly dominated by Callistocythere neoplana (association D), in some places with associated Procythereis aff. lyttletonensis and Leptocythere lacustris (association E).
Among the 116 species of ostracods recognized within the Waitemata Basin (Otaian stage, Lower Miocene,Northland, New Zealand), especially from the beds of Waiheke Island, Hobson Bay and Manukau Harbour, 28 species and 1 genus (Swansonites) are new: Cytherella ballancei, Cytherella bissoni, Cytherella chapmani, Neonesidea waitematanensis, Bairdoppilata kerryi, Keijia ? homibrooki, Swansonites intermedia, Callistocythere mansari, Bythoceratina robusta, Oculocytheropteron grantmackiei, Oculocytheropteron ferrierei, Microcytherura haywardi, Sagmatocythere carboneli, Neobuntonia oneroaensis, Hermanites rectidorsa, Hermanites spinosa, Quadracythere dorsipunctata, Ambostracon elongata, Ambostracon ? fredbrooki, “Trachyleberis” denticulata, Ponticocythereis ? praemilitaris, Alataleberis paranuda, Triginglymus ? hobsonensis, Krithe swansoni, Parakrithella lethiersi, “Cytherois” parallela, Paracytheroma convexa and Xestoleberis waihekeensis. One new subspecies Trachyleberis thomsoni ayressi is formaly described. Five other species are described but let in open nomenclature; Healdia ? sp., Leptocythere ? sp., Loxoconcha ? sp., Trachyleberis ? sp. and Sarsiella sp.
