Parasites and Symbionts of the Crab Portunus Pelagicus from Moreton Bay, Eastern Australia

1992 ◽  
Vol 12 (1) ◽  
pp. 94-100 ◽  
Author(s):  
Jeffrey D. Shields
Keyword(s):  
Portunus Pelagicus ◽  
Moreton Bay ◽  
Eastern Australia

scholarly journals Distribution of barnacle epizoites of the crab Portunus pelagicus in the Moreton Bay region, eastern Australia

2004 ◽  
Vol 55 (3) ◽  
pp. 241 ◽  
Author(s):  
Shane W. Gaddes ◽  
Wayne D. Sumpton
Keyword(s):  
Population Dynamics ◽  
Decapod Crustaceans ◽  
Portunus Pelagicus ◽  
Proximal Surface ◽  
Moult Stage ◽  
Moreton Bay ◽  
Important Impact ◽  
Gill Chamber ◽  
Eastern Australia ◽  
The Mean

The parasites of some decapod crustaceans are known to cause sterilisation of their hosts, and can thus have an important impact on the population dynamics of infested species. Blue swimmer crabs (Portunus pelagicus) collected in three areas around Moreton Bay, Australia were examined for the presence of epizoic barnacles in their branchial chambers and on their carapace. Of the 952 crabs inspected 92% were infested with Octolasmis spp. The mean number of barnacles (predominantly Octolasmis warwickii) per carapace and gill chamber (mainly O. angulata) were 2.35 and 71.1, respectively. Barnacle infestation of gills was found to differ significantly by area, season and sex with the deeper offshore areas exhibiting the highest number of barnacles. The distribution within the hosts showed barnacles were more likely to be distributed in areas closer to the inhalant aperture. Highest abundances were found on the proximal surface of the hypobranchial side of gills 3, 4 and 5. Host moult stage and parasitism by Sacculina granifera were also found to affect the abundance of epizoic barnacles in some areas.

Partitioning of material discarded from Prawn Trawlers in Morton Bay

1990 ◽  
Vol 41 (1) ◽  
pp. 27 ◽  
Author(s):  
TJ Wassenberg ◽  
BJ Hill
Keyword(s):  
Water Column ◽  
Tursiops Truncatus ◽  
Portunus Pelagicus ◽  
Moreton Bay

Prawn trawlers in Moreton Bay, Queensland, discard about 3000 t of material each year. About 3% floats, and the rest sinks. The floating component is almost entirely fish. At night, floating discards are eaten by silver gulls (Larus novaehollandiae), crested terns (Sterna bergii) and, to a lesser extent, dolphins (Tursiops truncatus). There is little trawling during the day but the last discards are dumped overboard around dawn. At this time cormorants (Phalacrocorax varius) join the scavengers. Birds and dolphins scavenged only fish and cephalopods, and not crustaceans nor echinoderms. Birds are selective as to the size of fish they will eat, but most of the whole fish in the discards are below 50 g, and the largest fish that crested terns ate was 100 g. Dolphins are capable of taking the largest of the discarded fish. Most of the material that sinks is crustaceans (54%) and echinoderms (18%); the rest is elasmo- branchs and rubble. At night, about half of the fish that sink are eaten by diving birds and by dolphins. There was no indication of mid-water scavenging of sinking discards, except for cormorants and dolphins in the upper water column. Approximately 11% of the discards that reach the bottom comprise fish and crustaceans, which are eaten by crabs (Portunus pelagicus) and fish. The remainder- chiefly crabs, echinoderms and elasmobranchs-reach the bottom alive. Altogether, about 20% of discards are eaten by surface and bottom scavengers. Discards are probably important in maintaining populations of the major scavengers.

Evaluation of anchor tags for marking the commercial sand crab, Portunus pelagicus (L.) (Portunidae : Decapoda)

1986 ◽  
Vol 37 (6) ◽  
pp. 707 ◽  
Author(s):  
MJ Williams
Keyword(s):  
Population Studies ◽  
Field Trials ◽  
Short Term ◽  
Portunus Pelagicus ◽  
Term Survival ◽  
Return Rates ◽  
Moreton Bay ◽  
Short Term Survival

Laboratory and field trials of a modified Floy FD67 anchor tag were conducted on P. pelagicus in Moreton Bay, Queensland. The tags did not affect short-term survival of the crabs in the laboratory. Only 470 of 1754 crabs tagged and released in the field were returned. Return rates of crabs by size, sex, and area of tagging class were markedly heterogeneous. Poor visibility of the tags on recapture, regardless of their colour, makes this tag unsuitable for any quantitative population studies. Poor return rates were exacerbated by fishermen not examining categories of crabs that are unmarketable.

Parasitism of the commercial sand crab Portunus pelagicus (L.) by the rhizocephalan Sacculina granifera Boschma, 1973 in Moreton Bay, Queensland, Australia

1994 ◽  
Vol 45 (2) ◽  
pp. 169 ◽  
Author(s):  
WD Sumpton ◽  
MA Potter ◽  
GS Smith
Keyword(s):  
Adult Female ◽  
Egg Mass ◽  
Size Distributions ◽  
Adult Males ◽  
Infection Rates ◽  
Portunus Pelagicus ◽  
Female Population ◽  
Moreton Bay ◽  
Adult Females

In Moreton Bay, Queensland, externae of Sacculina granifera Boschma were found in 7.0% of adult males and 123% of adult females of Portunus pelagicus. Infection rates were seasonal for both sexes and higher in the adult female population, with more than 20% of adult females carrying externae during some summer months. Infection rates were less than 3% in areas outside the bay and generally highest in the southern and central bay. Nineteen males and 15 females had abdominal scars where externae had become dislodged. The gonads of most parasitized crabs were underdeveloped, but 5.6% of externa-bearing females and 10% of externa-bearing males also had well developed gonads. Two female sand crabs were found with both a small egg mass and a mature externa (a condition not previously reported). Size distributions of infected and uninfected adult crabs were similar, suggesting that large crabs as well as juvenile crabs were likely to be infected.

Business as usual for the human use of Moreton Bay following marine park zoning

2018 ◽  
Vol 69 (2) ◽  
pp. 277 ◽  
Author(s):  
R. A. Kenyon ◽  
R. C. Babcock ◽  
Q. Dell ◽  
E. Lawrence ◽  
C. Moeseneder ◽  
...  
Keyword(s):  
Significant Proportion ◽  
Recreational Fishing ◽  
Commercial Fishing ◽  
Multiple Use ◽  
Fishing Activity ◽  
Moreton Bay ◽  
Marine Park ◽  
Eastern Australia ◽  
Before And After ◽  
Human Use

The multiple-use Moreton Bay Marine Park in eastern Australia was rezoned in 2009, increasing the total no-take marine national park (MNP) from 0.5 to 16%. In the present study we measured trends in the human use of no-take areas using observed vessel position and categorisation during on-water and aerial surveys before and after rezoning. Measured changes in spatial patterns of fishing showed that the effects of rezoning on most fishing activity was minimal. After rezoning, the proportion of recreational fishing declined from 6.3 to 2.6% of the footprint in the new MNPs. The proportion of commercial fishing declined from 25 to 1%, although the amount of commercial fishing was low. There was an overall increase in fishing activity on Moreton Bay. Low recreational fisher displacement suggests that the expansion of the MNP area did not have a high social cost. However, most of the no-take zones were areas not previously subject to high recreational fishing pressure. If a significant proportion of the no-take zones were placed in areas of low ecological production, the biodiversity conservation impact achieved by the rezoning of Moreton Bay may have been less than the 16% increase in no-take areas would imply.

scholarly journals Two new species of Hydromedusae from Queensland, Australia (Hydrozoa, Leptothecata)

ZooKeys ◽  
2018 ◽  
Vol 783 ◽  
pp. 17-36
Author(s):  
Julian Uribe-Palomino ◽  
Sarah Pausina ◽  
Lisa-Ann Gershwin
Keyword(s):  
New Species ◽  
Coastal Waters ◽  
Bell Diameter ◽  
Size At Maturity ◽  
Barrier Reef ◽  
Unique Combination ◽  
Moreton Bay ◽  
Routine Monitoring ◽  
Eastern Australia ◽  
Two New Species

Two new species of small hydromedusae were found during routine monitoring in coastal waters of eastern Australia and are here described. The first,MelicertissaantrichardsoniUribe-Palomino & Gershwin,sp. n., from Moreton Bay, Queensland, is placed in its genus because of its possession of both cordyli and eight-fold symmetry. It differs from its congeners in two conspicuous features: firstly, having small, oval split gonads located adjacent to the base of the stomach, and secondly, in its extremely small size at maturity (2 mm bell diameter, compared to the next smallest species at 7 mm). Moreover, it possesses a unique combination of other characters. This species appears to be endemic to Moreton Bay. The second new species,ParaloveniayongalensisGershwin & Uribe-Palomino,sp. n., from the Great Barrier Reef, Queensland, is placed in its genus because of its two opposite normal tentacles and two opposite marginal clusters of cirri. It differs from its congeners primarily in a more rounded body than the others; the shape, length, and position of its short spindle-shaped, distal gonads; possession of subumbrellar nematocyst clusters; and possession of statocysts. These discoveries bring the total number ofMelicertissaspecies to eight and the total number ofParaloveniaspecies to three. The discovery of these two micromedusae underscores the need for further examination of the often-ignored minute and/or gelatinous fauna.

scholarly journals Editorial

1986 ◽  
Vol 3 ◽  
pp. 2-3
Author(s):  
Jay Hall
Keyword(s):  
Cultural Change ◽  
Late Holocene ◽  
The State ◽  
Coastal Dune ◽  
Human Occupation ◽  
Moreton Bay ◽  
Eastern Australia ◽  
Fundamental Research ◽  
Soil Units ◽  
Significant Discovery

1986 has been a very good year for archaeology in Queensland. As the following pages testify, fundamental research is being undertaken throughout the length and breadth of the state. Furthermore it is being carried out by researchers who hail from not only Queensland but institutions throughout Australia. Perhaps the most significant discovery reported this year was the site of Wallen Wallen Creek on North Stradbroke Island, Moreton Bay (see R. Neal and E. Stock, Nature 1986:618-621). While excavating a recent surface midden for salvage purposes, Rob Neal, a Ph.D candidate at Queensland University, discovered a deep (2.5m) deposit within a coastal dune which yielded a continuous human occupation sequence. Collaboration with geomorphologist Errol Stock from Griffith University established that two soil units were formed after the dune was laid down and that associated cultural material is relatively undisturbed. C14 dating revealed an internally consistent series of determinations which stretch to over 22,000 B.P. Present results indicate a dramatic increase in occupation intensity (as measured by discard rate) in the late Holocene (esp. after ca. 2,000 B.P.), a pattern which fits well with results from other research in this area (eg. Hall Robins QAR, Volume 1) as well as other parts of eastern Australia. This discovery has provided the Pleistocene-Holocene chronological framework that has been sought for the Moreton Region for several years now. Future analysis of Wallen Wallen Creek material promises to add much to our notions of cultural change in this and adjacent areas.

Indurated sand horizon influences present day coastal geomorphology of nearshore Northern Moreton Bay, South-East Queensland, Australia

2020 ◽  
Author(s):  
Craig Heatherington ◽  
Simon Albert ◽  
Remo Cossu ◽  
Justine Kemp ◽  
Alistair Grinham
Keyword(s):  
Sea Level ◽  
Sand Dunes ◽  
Historical Context ◽  
Soil Formation ◽  
Coastal Geomorphology ◽  
Sea Levels ◽  
Moreton Bay ◽  
Core Samples ◽  
Marine Sand ◽  
Eastern Australia

<p>Sea-level rise will lead to substantial changes to coastal geomorphology over the coming century and it is imperative to understand the implications. This includes the underlying stratigraphic influences on seabed morphology and the historical context with which they have formed. On the densely populated coastline of Eastern Australia, coastal erosion is a significant concern for residents and stakeholders. In South East Queensland, and particularly the coastal zone surrounding Bribie Island spit in Northern Moreton Bay, the accelerated erosion of the spit and discovery of indurated sand horizons in nearshore regions both above and below the seabed create a convergence of the past influencing the present.</p><p>Indurated sand horizons are predominantly considered to be the relict B horizon of the pedogenic processes that formed a podosol soil profile. Whilst not ubiquitous under present sea level, their presence presents a unique opportunity to study an accessible palaeosol unaltered by further pedogenesis and carbon input (as opposed to terrestrial indurated sand formations). This allows for an analysis of a time in Northern Moreton Bay during lower sea levels and how these horizons affect present day morphology. Data acquisition consisted of high and low frequency acoustics, coupled with core samples for geological analysis.</p><p>Our results show the indurated sands buried under 1-2 m of marine sands sloping downwards to the east. This suggests the present-day seabed follows the contours of the sub-surface indurated sand. High-resolution bathymetry of exposed indurated sand outcrops near Bribie Island spit indicate a dune-like shape suggesting a formation from coastal sand dunes into active terrestrial soil during lower sea levels. The dune troughs having accumulated greater mineral and organic material than the peaks, which can be attributed to the former surviving inundation from rising sea levels and the latter having undergone a weaker pedogenesis and subsequently erosion. Exposed indurated sand outcrops with a vertical face or ‘scour step’ are elevated to the surrounding marine sand seabed. Similar elevated structures were found to be a barrier to onshore sediment transport from offshore deposits and limiting beach replenishment whilst also offering protection from dampening long period waves and large storm swells. Core samples taken through the indurated layer from behind the spit to the shipping channel offshore showed elevated levels of aluminium and iron compared to surrounding marine sands, and consistent with podosol soil formation.</p><p>The techniques used here suggest that historical terrestrial geomorphology has determined the shape, mineralogy and strength of indurated sand layers. As these indurated sand layers were submerged and further modified by present day sea level, they may play an important role in coastal geomorphology and protection as sea levels rise further in the coming century.</p>

Parapseudid tanaidaceans (Crustacea: Tanaidacea: Apseudomorpha) from Eastern Australia  

Zootaxa ◽  
2007 ◽  
Vol 1401 (1) ◽  
pp. 1 ◽  
Author(s):  
MAGDALENA BŁAEWICZ-PASZKOWYCZ ◽  
ROGER N. BAMBER
Keyword(s):  
Identification Key ◽  
Congeneric Species ◽  
Sympatric Distribution ◽  
Australian Species ◽  
Moreton Bay ◽  
Marine Biological ◽  
Eastern Australia ◽  
Habitat Differences ◽  
High Diversity

Australian tanaidacean specimens from two extensive collections have been analyzed based on material collected from the Bass Strait and slope in the 1970s to 1980s and held in the collections of the Museum Victoria, Melbourne, along with material collected during the Thirteenth International Marine Biological Workshop around Moreton Bay, Queensland, in 2005. A number of new parapseudid taxa were discovered, including one common to both collections. These taxa, representing three species of Pakistanapseudes, one of Saltipedis and one of a genus new to science, Remexudes, are described in the present paper. In addition, the finding of further material of P. australianus in Moreton Bay has allowed supplementary description of that species. An identification key to the Australian species of Pakistanapseudes is given. The concept of high diversity of Tanaidacea in the Australian fauna is reinforced; the apparent sympatric distribution of congeneric species is accounted for by habitat differences.

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