Mesoscale circulation features of the great barrier reef region inferred from NOAA satellite imagery

Burrage, Derek; Steinberg, Craig; Skirving, William; Kleypast, Joan A.

doi:10.1016/0034-4257(95)00226-x

Cited by 45 publications

(36 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The first is environmental changes in water temperature associated with post-Pleistocene climate variation. The geographical range disjunction between the two Cryptasterina species in Australia is about 375 km and approximately coincides with the location where colder eastern Pacific waters mix with warmer tropical waters transported by the East Australian Current (EAC) [58]. Our estimate of 6000 ypb for the speciation event is much more recent than the last glacial maximum (LGM), but it coincides with other significant Holocene oceanographic events.…”

Section: Discussionsupporting

confidence: 53%

“…We hypothesize that a small number of C. pentagona individuals or larvae were able to colonize the presentday range of C. hystera, and that this habitat [58] provided a divergent selective regime that led to the loss of planktonic development and other associated life-history changes, with reproductive isolation and speciation as a consequence. The speed of this speciation event suggests that it occurred via selection upon preexisting genetic variation on an ecological time scale, because it is unlikely that a complex suite of derived life-history characters including hermaphroditism, selfing and live-bearing could so quickly evolve via drift-and mutation-driven processes [9,63,64].…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Extraordinarily rapid life-history divergence between Cryptasterina sea star species

et al. 2012

View full text Add to dashboard Cite

Life history plays a critical role in governing microevolutionary processes such as gene flow and adaptation, as well as macroevolutionary processes such speciation. Here, we use multilocus phylogeographic analyses to examine a speciation event involving spectacular life-history differences between sister species of sea stars. Cryptasterina hystera has evolved a suite of derived life-history traits (including internal self-fertilization and brood protection) that differ from its sister species Cryptasterina pentagona, a gonochoric broadcast spawner. We show that these species have only been reproductively isolated for approximately 6000 years (95% highest posterior density of 905-22 628), and that this life-history change may be responsible for dramatic genetic consequences, including low nucleotide diversity, zero heterozygosity and no gene flow. The rapid divergence of these species rules out some mechanisms of isolation such as adaptation to microhabitats in sympatry, or slow divergence by genetic drift during prolonged isolation. We hypothesize that the large phenotypic differences between species relative to the short divergence time suggests that the lifehistory differences observed may be direct responses to disruptive selection between populations. We speculate that local environmental or demographic differences at the southern range margin are possible mechanisms of selection driving one of the fastest known marine speciation events.

show abstract

Section: Discussionsupporting

confidence: 53%

Section: Discussionmentioning

confidence: 99%

Extraordinarily rapid life-history divergence between Cryptasterina sea star species

et al. 2012

View full text Add to dashboard Cite

show abstract

“…Even in dense reef areas of the GBR (i.e., areas with a large ratio of reef area to the area between the reefs), such as the Swains reefs, an inflow from the adjacent Coral Sea can be traced. In this paper we have only presented two examples of extensive intrusion in the GBR but such intrusions had already been reported in the literature [Burrage et al, 1996;Brinkman et al, 2002]. More work is needed using satellite imagery to analyze the frequency of these intrusions, however the data presented here support the proposition that, on occasions, very large water exchange events occur.…”

Section: Description Of the Drifter Trajectories In The Gbrsupporting

confidence: 50%

“…In the southern GBR, evidence of oceanic waters intruding inside the lagoon can be seen on the Chl-a images but associated with colder waters. These have been attributed to upwelling events taking place along the Capricorn Bunker shelf and in the mouth of the Capricorn Channel [Kleypas and Burrage, 1994;Burrage et al, 1996]. Even in dense reef areas of the GBR (i.e., areas with a large ratio of reef area to the area between the reefs), such as the Swains reefs, an inflow from the adjacent Coral Sea can be traced.…”

Section: Description Of the Drifter Trajectories In The Gbrmentioning

confidence: 99%

On the surface circulation in the western Coral Sea and residence times in the Great Barrier Reef

Choukroun¹,

Ridd²,

Brinkman³

et al. 2010

J. Geophys. Res.

View full text Add to dashboard Cite

[1] Surface velocity observations from satellite tracked drifters made between 1987 and 2008 were used to resolve the surface circulation of the western Coral Sea, west of 158°E, and the Great Barrier Reef (GBR). The mean surface current map depicts well the major circulation patterns of the region, such as the position of the north Vanuatu and north Caledonia jets (NVJ and NCJ) and the western boundary currents. The North Queensland Current (NQC) and the East Australian Current (EAC) are well defined, flowing at speeds greater than 50 cm s −1 to the north, south of 15°S and 19°S, respectively. The NQC/EAC is mainly formed by the NVJ/NCJ flows, respectively. The presence of the Queensland Plateau greatly affects the westward flow, causing a zone of weak and highly variable currents that extends from 15°S to 18°S between the Queensland Plateau and the GBR shelf. Of the 235 drifters that crossed the western Coral Sea, 75 entered the GBR. Analysis of the drifter trajectories inside the GBR reveals the presence of a northwestward circulation at speeds of 22 cm s −1 north of 18°S and 0.5 cm s −1 south of 18°S. Drifter travel times used to evaluate the water residence times within the GBR indicate residence times of a few weeks for most of the lagoon.

show abstract

“…The formation of a stable cyclonic eddy in the lee of the shelf bathymetry was later postulated as contributing toward north-westward flow in the Capricorn Channel region (Griffin et al 1987). Subsequent oceanographic deployments and satellite sea surface temperature studies have shown these cyclonic features to trigger upwelling along the continental shelf (Kleypas and Burrage 1994;Middleton et al 1994;Burrage et al 1996).…”

Section: The Capricorn Eddymentioning

confidence: 99%

The Capricorn Eddy: a prominent driver of the ecology and future of the southern Great Barrier Reef

et al. 2010

View full text Add to dashboard Cite

This study focuses on a mesoscale eddy feature, the 'Capricorn Eddy', that typically forms within an indentation of the continental shelf in the southern GBR system. Satellite data at moderate resolution (1 km) are used to examine relevant mesoscale and sub-mesoscale sea surface dynamics. Available in situ measurements and model data are used to validate the satellite observations and to specify the nature of the processes occurring within the water column itself. The characteristic features are identified and physical theory employed to develop an understanding of associated processes. In particular, the effect of the eddy in raising cooler, nutrient-enriched oceanic subsurface water and transporting it to the reef zone, and eventually into the lagoon, is shown. This study demonstrates that the linkages between large-scale oceanography and the meso-and sub-mesoscale patterns are crucial to determining biologic responses on the scale of reef communities and may be key to understanding climate change impacts at the relevant spatial scales.

show abstract

Mesoscale circulation features of the great barrier reef region inferred from NOAA satellite imagery

Cited by 45 publications

References 48 publications

Extraordinarily rapid life-history divergence between Cryptasterina sea star species

Extraordinarily rapid life-history divergence between Cryptasterina sea star species

On the surface circulation in the western Coral Sea and residence times in the Great Barrier Reef

The Capricorn Eddy: a prominent driver of the ecology and future of the southern Great Barrier Reef

Contact Info

Product

Resources

About