Hyperiid amphipods (Crustacea : Peracarida) from a warm-core eddy in the Tasman Sea

Young, JW

doi:10.1071/mf9870711

Cited by 9 publications

(10 citation statements)

References 21 publications

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“…The seven most numerous species in the southern gyre comprised 50% of total hyperiid numbers; in the northern gyre, the first two species comprised 48.8% of total specimens, and the first three, 55.2%. In addition, the six leading species of the northern gyre made up 68.2% of specimens, but in the Tasman Sea (Young and Anderson 1987) fauna diversity was even lower, the first seven~spe -cies constituting 86.8% of total numbers. Furthermore, in the southern gyre 35 species represented 90% of specimens, but in the northern gyre this proportion was occu-G.M.…”

Section: Discussionmentioning

confidence: 98%

“…In the rich collection from the Tasman Sea adjacent to the southwestern boundary of the gyre (24 000 specimens; Young and Anderson 1987), 38 hyperiid species were represented. The most abundant of these were Phrosina semilunata, Brachyscelus cruseulum, Primno johnsoni (= latreillei) and Streetsia challengeri (although Phronima atlantica and P. solitaria were among the first seven).…”

Section: Discussionmentioning

confidence: 99%

“…has made it possible to acquire representative material even in the poorest oligotrophic regions. Therefore, we recently obtained rather complete evidence of the hyperiid fauna in various, previously almost uninvestigated regions of the Pacific Ocean: the North Pacific central gyre (Shulenberger 1977), the Gulf of California (Siegel-Causey 1982), the Tasman Sea (Young and Anderson 1987), and central regions of the southern subtropical and the subantarctic zones (Barkhatov and Vinogradov 1988). The hyperiid collections from each of these regions include thousands of specimens (from 15 000 to 45 000) comprised of dozens of species (from 38 to 111).…”

Section: Introductionmentioning

confidence: 98%

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Hyperiid amphipods in the eastern part of the South Pacific gyre

Vinogradov

1991

Mar. Biol.

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Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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Hyperiid amphipods in the eastern part of the South Pacific gyre

Vinogradov

1991

Mar. Biol.

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“…Dotted line represents external fertilisation graeff 1981). Young (1989) also found high concentrations of salps on the outside and on the edge of a warm-core eddy (centred at 33°30' S, 153°30' E) in September and October 1979. Recent studies have identified the possibility to predict patches of salps based on meteorological and oceanographic data (Deibel & Paffenhofer 2009).…”

Section: Introductionmentioning

confidence: 99%

Distribution of life-history stages of the salp Thalia democratica in shelf waters during a spring bloom

Henschke¹,

Everett²,

Baird³

et al. 2011

Mar. Ecol. Prog. Ser.

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Swarms of the salp Thalia democratica periodically occur off southeast Australia following the austral spring bloom of phytoplankton. The present study aimed to determine the abundance and size/stage distribution of T. democratica and their relationship with copepods in 3 water types of the western Tasman Sea. Samples were taken from vertical net hauls along 4 cross-shelf transects spaced along 200 km of the New South Wales coast, from the East Australian Current (EAC) separation zone, around 32.5°S, to off Sydney (34°S). Temperature-salinity signatures grouped stations into 3 distinct water types: inner shelf water, EAC and upwelled water. Although common across all stations, T. democratica was significantly more abundant in inner shelf waters compared to both EAC and upwelled water. Analysis of population structure (aggregate buds, aggregate females, aggregate males, immature solitaries and mature solitaries) also identified higher proportions of reproductive aggregates and their offspring in inner shelf water. This salp population structure was significantly different in the EAC regions, characterised by a paucity of the solitary stages, higher temperatures and lower chlorophyll a concentrations. A weak negative correlation was identified between T. democratica and copepod abundance. In the present study, the maximum abundance of T. democratica was twice the highest globally recorded abundance and 10-fold greater than maximum abundances sampled from the continental shelf and slope waters off southeast Australia during the period from 1938 to 1942. KEY WORDS: Thalia democratica · Salps · Life cycle · Zooplankton · Water types · Population structure · East Australian CurrentResale or republication not permitted without written consent of the publisher Mediterranean (Licandro et al. 2006) and South Africa (Gibbons 1997). Occasional swarms of gelatinous species, including salps, are well known historically, but recent reports indicate that these are increasing in frequency and magnitude as a result of human-induced stresses such as eutrophication and climate change (Hay 2006).Salp swarms are possible as a result of their life cycle involving the obligatory alternation between aggregated sexual and solitary asexual generations (Fig. 1), allowing Thalia democratica populations to grow exponentially while maintaining genetic variability (Godeaux et al. 1998). The aggregate stage begins life as a chain of genetically identical individuals ('buds' or A1) and reproduces sexually. Born female, aggregates separate and are externally fertilised immediately after release from their parent, and an embryo grows internally (A2). Once the embryo is born, female aggregates develop testes and function as a male (A3). These males (A3) then fertilise the recently released buds (A1) before dying shortly thereafter. The embryo is the start of the solitary generation (S1) that asexually produces up to 3 chains, each with between 20 and 80 individual aggregates (A1). Once mature (S2), solitaries release each chain separatel...

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“…Despite the trophic role of hyperiids in oceanic regions and their potential as indicators of circulation, there are no studies addressing the relationship between hyperiid diversity and hydrographic features in the CC. In the southwest Pacific, species composition has been investigated in warm-core eddies from the Coral Sea, as has the role of these eddies in the transportation of tropical hyperiids into the Tasman Sea (Young & Anderson 1987). Bradford & Chapman (1988) studied another warm-core eddy generated east of New Zealand, which aggregated diverse zooplankton species.…”

Section: Introductionmentioning

confidence: 99%

Seasonal variation in hyperiid amphipod abundance and diversity and influence of mesoscale structures off Baja California

Lavaniegos

Hereu²

2009

Mar. Ecol. Prog. Ser.

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Hyperiid amphipods collected during 4 IMECOCAL (Spanish acronym for Mexican Investigations of the California Current) cruises in January, April, July, and October 2005 were analyzed for seasonal variation in abundance and diversity and to determine the influence of surface circulation. The number of species was high in all seasons (between 79 and 92), but abundances showed remarkable differences. The total number of amphipods was lowest in January and highest in October (geometric means were 82 and 606 ind. 1000 m -3 respectively). Multivariate analysis based on similarity indices demonstrated a tight coupling between species composition and mesoscale structures. The largest cluster joined 67 stations, with 40% of similarity being explained by 4 species (Vibilia armata, Lestrigonus schizogeneios, Eupronoe minuta, and Primno brevidens). The geographic position of these stations coincided with the main California Current (CC) flow from spring to autumn. Subgroups were defined by minor seasonal differences. In contrast, the CC flow during winter was reduced to a meander off north Baja California, and was surrounded by oligotrophic water as indicated by the presence of the hyperiids Anchylomera blossevillei and Phrosina semilunata plus 3 of the dominant species (V. armata, E. minuta, and P. brevidens). To the south of this front, other clusters with high oceanic influence were formed. In 2005, 3 eddies were detected in the area: one anticyclonic eddy in April and 2 cyclonic eddies in July. The anticyclonic eddy located in the southwest had its own faunal cluster that had high diversity but low population density. The main species in the anticyclonic eddy was Platyscelus ovoides. Only one of the cyclonic eddies had a unique faunal identity, being strongly dominated by Vibilia armata; this was located in the north between the CC flow and the coast. The other eddy was large and situated in the middle of the area, with a faunal array analogous to that in the CC flow. Correlation between hyperiid and salp species abundances suggested that the increase in salps (Salpa fusiformis, Thalia orientalis, Cyclosalpa bakeri) in spring could be relevant, as many hyperiid species showed a strong increase at this time. However, the most correlated salp was Cyclosalpa danae, which occurred only in October. Chains of C. danae aggregates were firmly attached in the samples. This would promote the aggregation and survival of amphipod hosts, particularly small species such as Lestrigonus schizogenios and L. bengalensis.

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Hyperiid amphipods (Crustacea : Peracarida) from a warm-core eddy in the Tasman Sea

Cited by 9 publications

References 21 publications

Hyperiid amphipods in the eastern part of the South Pacific gyre

Hyperiid amphipods in the eastern part of the South Pacific gyre

Distribution of life-history stages of the salp Thalia democratica in shelf waters during a spring bloom

Seasonal variation in hyperiid amphipod abundance and diversity and influence of mesoscale structures off Baja California

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