scholarly journals Correction to ‘Blue Carbon stocks of Great Barrier Reef deep-water seagrasses’

2020 ◽  
Vol 16 (1) ◽  
pp. 20190784
Author(s):  
Paul H. York ◽  
Peter I. Macreadie ◽  
Michael A. Rasheed
Keyword(s):  
Great Barrier Reef ◽  
Deep Water ◽  
Carbon Stocks ◽  
Blue Carbon ◽  
Barrier Reef

scholarly journals Blue Carbon stocks of Great Barrier Reef deep-water seagrasses

2018 ◽  
Vol 14 (12) ◽  
pp. 20180529 ◽  
Author(s):  
Paul H. York ◽  
Peter I. Macreadie ◽  
Michael A. Rasheed
Keyword(s):  
Great Barrier Reef ◽  
Shallow Water ◽  
Deep Water ◽  
Inorganic Carbon ◽  
Blue Carbon ◽  
Barrier Reef ◽  
Lizard Island ◽  
Sink Capacity ◽  
Shallow Water Species ◽  
Water Species

Shallow-water seagrasses capture and store globally significant quantities of organic carbon (OC), often referred to as ‘Blue Carbon’; however, data are lacking on the importance of deep-water (greater than 15 m) seagrasses as Blue Carbon sinks. We compared OC stocks from deep-, mid- and shallow-water seagrasses at Lizard Island within the Great Barrier Reef (GBR) lagoon. We found deep-water seagrass ( Halophila species) contained similar levels of OC to shallow-water species (e.g. Halodule uninervis ) (0.64 ± 0.08% and 0.9 ± 0.1 mg C cm −3 , 0.87 ± 0.19% and 1.3 ± 0.3 mg C cm −3 , respectively), despite being much sparser and smaller in stature. Deep-water seagrass sediments contained significantly higher levels (approx. ninefold) of OC than surrounding bare areas. Inorganic carbon (CaCO 3 ) levels were relatively high in deep-water seagrass sediments (8.2 ± 0.4%) and, if precipitated from epiphytes within the meadow, could offset the potential CO 2 -sink capacity of these meadows. The δ 13 C signatures of sediment samples varied among depths and habitats (−10.9 and −17.0), reflecting contributions from autochthonous and allochthonous sources. If the OC stocks reported in this study are similar to deep-water Halophila meadows elsewhere within the GBR lagoon (total area 31 000 km 2 ), then OC bound within this system is roughly estimated at 27.4 million tonnes.

scholarly journals A unique taphonomic profile for Lower Carboniferous crinoids of western Canada and possible Recent analogs

1992 ◽  
Vol 6 ◽  
pp. 288-288
Author(s):  
Richard E. Terry ◽  
David L. Meyer
Keyword(s):  
Great Barrier Reef ◽  
Shallow Water ◽  
Deep Water ◽  
High Abundance ◽  
Predatory Fish ◽  
Western Canada ◽  
Barrier Reef ◽  
Visceral Mass ◽  
Lower Carboniferous ◽  
Lizard Island

During diving studies of comatulid crinoids at Lizard Island, Great Barrier Reef, detatched but intact crinoid arms and arm groups were sometimes encountered on the substratum. These arms are thought to originate through autotomy or breakage during attacks of predatory fish that remove the calyx and visceral mass but leave the arms intact. Detached arms remain in a vital condition for several days but soon lose pinnules and fragment as decay ensues.Occurrence of intact, isolated arms and arm groups in the Banff Formation of western Alberta requires a catastrophic disturbance (not necessarily predation) followed closely, if not coincidently, with burial. The loose arms are preserved mostly as short, straight, distal arm segments (1–2 cm long) or sometimes as long, curved arm segments (2–4.5 cm). The arm groups range from complete arm rays to partial arm rays. If originally present, pinnules are still articulated to the arms and cover plates are preserved on most pinnules. Biserial arms with pinnules, uniserial arms and uniserial arms with pinnules occur in a 2:1 ratio to crinoids having that type of arm structure whereas cuneiform arms with pinnules have a 3:1 ratio of preserved loose arms and arm groups to calyces. Loose, single arms and arm groups account for 33% and 11%, respectively, of the identifiable crinoid remains for the western, deep-water Banff Formation crinoid fauna. Overall, this fauna shows an equitable range from complete articulated crinoid crowns with attached stems to loose isolated plates. The preservation of this fauna has both a time-averaged, accumulation component as well as an instantaneous storm deposited component as represented by both completely articulated crinoids and the high abundance (44%) of loose arms and arm groups. The comparatively anomalous abundance of loose arms and arm groups probably originated through breakage or autotomy coincident with the burial event.In comparison, the Gilmore City crinoid fauna of Iowa represents an obrution deposit with over 75% of the crinoid specimens preserved as complete articulated crowns with attached stems whereas the eastern Banff Formation crinoid fauna is preserved as a shallow-water, time-averaged accumulation of mainly isolated crinoid calyx plates (54%) and partial calyces (20%). However, both of these faunas have few preserved loose arms or arm groups (<4% for either fauna).

Settlement and recruitment of Acanthatser planci on the Great Barrier Reef: questions of process and scale

1992 ◽  
Vol 43 (3) ◽  
pp. 611 ◽  
Author(s):  
C Johnson
Keyword(s):  
Spatial Distribution ◽  
Great Barrier Reef ◽  
Deep Water ◽  
Large Scale ◽  
Coral Cover ◽  
Larval Settlement ◽  
Future Research ◽  
Small Scale ◽  
Barrier Reef ◽  
Coral Rubble

This paper briefly reviews information on settlement and recruitment of Acanthaster planci in the Great Barrier Reef (GBR) system, with emphasis on the recent phenomenon of population outbreaks of the starfish. Observations that recent outbreaks have occurred in two series of activity (1962-77 and 1979-91+), each characterized by a southward wave of infestations in the central section of the GBR, and that outbreaks are not preceded by observable increases in densities of juveniles, have important implications for settlement and recruitment processes. The pattern of outbreaks indicates that primary outbreaks occur infrequently and unpredictably in the vicinity of 16�s. However, it is not possible to assert that primary outbreaks have not occurred elsewhere in the GBR system, and isolated outbreaks at the southern end of the GBR may be primary events. Present data are insufficient to discern whether recruitment leading to primary outbreaks is by mass settlement of larvae or aggregation of adult starfish of various ages. In contrast, evidence indicates strongly that the majority of outbreaks in the system are secondary infestations as a result of water-borne transport and subsequent mass settlements of planktonic larvae seeded by other outbreak populations (and initially by populations undergoing primary outbreaks). The likelihood and pattern of secondary outbreaks is influenced by several parameters that operate at vastly different scales. These include passive transport of larvae by large-scale circulation patterns at scales of 104-106 m, which can largely account for the southward wave, and substratum selectivity by larvae at small scales (0-10-3 m). The spatial distribution of important cues for larval settlement (coral rubble and the coralline alga Lithothamnium pseudosorum) suggests that mass settlements are more likely to occur in deep water at the base of reefs, where they are less likely to be observed. Several foci are defined for future research on settlement and recruitment processes. These include (1) identification of parameters influencing the spatial and temporal distribution of recruitment events that initiate primary outbreaks, (2) testing of hypotheses relating to dissipation of the southward movement of outbreaks at about 20�s despite an abundance of reefs in the area supporting high coral cover, (3) determining the period of competency of larvae for settlement, (4) elucidating the behaviour of larvae (particularly late brachiolaria) in the water column, (5) further work to identify substrata inductive of larval settlement and to determine the nature of inducers, the spatial distribution of inductive substrata, and the effect of small-scale hydrodynamic processes in modifying the response of larvae to inductive substrata, and (6) testing of the hypothesis of deep-water recruitment.

scholarly journals Dynamics of a deep-water seagrass population on the Great Barrier Reef: annual occurrence and response to a major dredging program

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Paul H. York ◽  
Alex B. Carter ◽  
Kathryn Chartrand ◽  
Tonia Sankey ◽  
Linda Wells ◽  
...  
Keyword(s):  
Great Barrier Reef ◽  
Deep Water ◽  
Barrier Reef

Current and future carbon stocks in coastal wetlands within the Great Barrier Reef catchments

2021 ◽  
Author(s):  
Micheli Duarte de Paula Costa ◽  
Catherine E. Lovelock ◽  
Nathan J. Waltham ◽  
Mary Young ◽  
Maria Fernanda Adame ◽  
...  
Keyword(s):  
Great Barrier Reef ◽  
Coastal Wetlands ◽  
Carbon Stocks ◽  
Barrier Reef
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