A review of the shelf-slope circulation along Australia’s southern shelves: Cape Leeuwin to Portland

Middleton, John; Bye, John A. T.

doi:10.1016/j.pocean.2007.07.001

Cited by 200 publications

(232 citation statements)

References 55 publications

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“…The extent and influence of currents and water masses vary seasonally and inter-annually in Bass Strait [11]. In accordance with previous oceanographic works at this region, our areas of influence highlighted eastward influence during autumn and winter, whereas areas of influences grow westward during summer [17,39]. This spatio-temporal variability is integrated in our dynamic scale by constructing areas of influence on a monthly basis.…”

Section: Discussionsupporting

confidence: 89%

A novel spatio-temporal scale based on ocean currents unravels environmental drivers of reproductive timing in a marine predator

et al. 2015

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Life-history strategies have evolved in response to predictable patterns of environmental features. In practice, linking life-history strategies and changes in environmental conditions requires comparable space–time scales between both processes, a difficult match in most marine system studies. We propose a novel spatio-temporal and dynamic scale to explore marine productivity patterns probably driving reproductive timing in the inshore little penguin ( Eudyptula minor ), based on monthly data on ocean circulation in the Southern Ocean, Australia. In contrast to what occurred when considering any other fixed scales, little penguin's highly variable laying date always occurred within the annual peak of ocean productivity that emerged from our newly defined dynamic scale. Additionally, local sea surface temperature seems to have triggered the onset of reproduction, acting as an environmental cue informing on marine productivity patterns at our dynamic scale. Chlorophyll- a patterns extracted from this scale revealed that environment factors in marine ecosystems affecting breeding decisions are related to a much wider region than foraging areas that are commonly used in current studies investigating the link between animals' life history and their environment. We suggest that marine productivity patterns may be more predictable than previously thought when environmental and biological data are examined at appropriate scales.

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Section: Discussionsupporting

confidence: 89%

A novel spatio-temporal scale based on ocean currents unravels environmental drivers of reproductive timing in a marine predator

et al. 2015

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Section: Resale or Republication Not Permitted Without Written Consenmentioning

confidence: 99%

“…Inter-annual variability in Bass Strait water temperature and productivity may be influenced by broad-scale events, including the ENSO in the western Pacific Ocean (Kidson & Renwick 2002, Middleton & Bye 2007. ENSO cycles influence the relative strength of the Leeuwin Current, causing variability in ocean productivity and species' movements (Pearce & Phillips 1988, Wilson et al 2001.…”

Section: Resale or Republication Not Permitted Without Written Consenmentioning

confidence: 99%

“…Water bodies that may enter the strait are the Subantarctic Surface Water (SASW) from the south, South Australian Current (SAC) from the northwest and East Australian Current (EAC) from the northeast (Newell 1961). Most current flow is eastward and enhanced by the predominantly westerly winds across southern Australia (Blackman et al 1987, Middleton & Bye 2007.Inter-annual variability in Bass Strait water temperature and productivity may be influenced by broad-scale events, including the ENSO in the western Pacific Ocean (Kidson & Renwick 2002, Middleton & Bye 2007. ENSO cycles influence the relative strength of the Leeuwin Current, causing variability in ocean productivity and species' movements (Pearce & Phillips 1988, Wilson et al 2001.…”

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confidence: 99%

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Sea temperature variations mediate annual changes in the diet of Australian fur seals in Bass Strait

Kirkwood¹,

Hume²,

Hindell³

2008

Mar. Ecol. Prog. Ser.

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Using a 9-yr data set, we investigated annual fluctuations in the diet of an apex predator, the Australian fur seal Arctocephalus pusillus doriferus. At Seal Rocks (northern Bass Strait), home to 25% of the entire species population, we assessed diet through collections (1997 to 2006) of scat and regurgitate samples. We identified prey remains of 42 fish taxa and 7 cephalopod taxa. Only crustaceans that were fish parasites or fish prey (amphipods and isopods) were found; no birds were identified in the samples. Six species represented 80% (as frequency of occurrence) of the fish prey, and the arrow squid Nototodarus gouldi represented 70% of cephalopod prey. There was significant annual variability in the diet. Principal component analysis indicated this was variability due to the presence of redbait Emmelichthys nitidus in some years, and its near absence and replacement in other years by increased proportions of barracouta Thyrsites atun, red cod Pseudophycis bachus and leatherjackets (Family Triglidae). Generalised Linear Models indicated the annual variation was related to mean sea surface temperatures in western Bass Strait where the seals foraged. Redbait proliferated in cooler years and were less abundant in warmer years. No corresponding annual correlation was evident between the prey assemblages and either annual fisheries catch-per-unit-effort or the annual mean Southern Oscillation Index. The propensity for diet regimes to persist for several years, then change suggests that oceanographic fluctuations probably influence previously unrecognised multi-year cyclic fluctuations of prey and of Bass Strait ecosystems. KEY WORDS: Arctocephalus · Fur seal diet · Sea temperature · Bass strait · Emmelicthys nitidus Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 369: [297][298][299][300][301][302][303][304][305][306][307][308][309] 2008 Arnould & Kirkwood 2008). Like other fur seals, such as the New Zealand fur seal A. forsteri (Harcourt et al. 2002), Australian fur seals are generalist predators and consume a range of benthic and pelagic prey; they exhibit some spatial and temporal variations in diet. During the 1920s and 1940s, their diet at breeding colonies in northern Bass Strait was determined by inspection of stomach contents in several shot animals, and comprised mainly barracouta (also known as snoek Thyrsites atun), cephalopods, and southern rock lobster Jasus novaehollandiae (Lewis 1930, McNally & Lynch 1954. In the 1980s and 1990s, the diet, determined from prey hard parts in scats and regurgitates at sites in southern Bass Strait and south of Tasmania, comprised mainly redbait Emmelichthys nitidus, jack mackerel Trachurus declivis, leatherjackets (Family Monocanthidae) and arrow squid Nototodarus gouldi (Gales et al. 1993, Gales & Pemberton 1994, Hume et al. 2004. Between 1997 and 2001 in northeastern Bass Strait, the same prey, plus red cod Pseudophycis bachus were the key species (Littnan 2003, Littnan et al. 2007; during 2001/2002 in ...

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“…In the austral summer the locations of two westward flows rather than one off the southern coast, i.e., a coastal current and the Flinders Current, have been depicted in Fig. 2 of Middleton and Bye (2007). Middleton and Cirano (2002) have shown that a positive wind stress curl on the southern coast can generate the westward Flinders Current, which has been observed to lie off the continental slope as a subsurface current which can reach the surface.…”

Section: Wind Forcing Over a Flat Bottommentioning

confidence: 99%

Process-oriented modeling studies of the 5500-km-long boundary flow off western and southern Australia

Batteen

Miller

2009

Continental Shelf Research

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A review of the shelf-slope circulation along Australia’s southern shelves: Cape Leeuwin to Portland

Cited by 200 publications

References 55 publications

A novel spatio-temporal scale based on ocean currents unravels environmental drivers of reproductive timing in a marine predator

A novel spatio-temporal scale based on ocean currents unravels environmental drivers of reproductive timing in a marine predator

Sea temperature variations mediate annual changes in the diet of Australian fur seals in Bass Strait

Process-oriented modeling studies of the 5500-km-long boundary flow off western and southern Australia

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