Effects of Lyngbya majuscula (Cyanophycea) blooms on sediment nutrients and meiofaunal assemblages in seagrass beds in Moreton Bay, Australia

2006 ◽  
Vol 57 (2) ◽  
pp. 155 ◽  
Author(s):  
Rosa García ◽  
Ron W. Johnstone
Keyword(s):  
Depth Distribution ◽  
East Coast ◽  
Oxygen Depletion ◽  
Seagrass Beds ◽  
Biogeochemical Processes ◽  
Sediment Depth ◽  
Lyngbya Majuscula ◽  
Moreton Bay ◽  
Bloom Period ◽  
Abundance And Distribution

Blooms of Lyngbya majuscula have been increasingly recorded in the waters of Moreton Bay, on the south-east coast of Queensland, Australia. The influences of these blooms on sediment infauna and the implications for sediment biogeochemical processes was studied. Sediment samples were taken from Moreton Bay banks during and after the bloom season. The deposition of L. majuscula seems to be responsible for the higher total Kjedahl nitrogen (TKN) concentrations measured during the bloom period. Total organic carbon (TOC) concentrations did not change. Lyngbya majuscula blooms had a marked influence on the meiobenthos. Nematodes, copepods and polychaetes were the most abundant groups of meiofauna, and the bloom produced a decrease in the abundance and a change in the sediment depth distribution of these organisms. The distribution of nematodes, copepods and polychaetes in sediment became shallower. Further, the bloom did not affect the abundance and distribution of polychaetes as strongly as it did copepods and nematodes. The changes observed in the distribution of meiofauna in the sediment during the bloom period indicate that L. majuscula produces oxygen depletion in sediments, and that different fauna seem to be affected to different degrees.

scholarly journals Prevalence, abundance, and distribution of Lepeoptheirus salmonis (Krøyer, 1837) and Caligus elongatus (Nordmann, 1832) on wild sea trout Salmo trutta L.

2008 ◽  
Vol 65 (2) ◽  
pp. 171-173 ◽  
Author(s):  
K. Urquhart ◽  
C. C. Pert ◽  
R. Kilburn ◽  
R. J. Fryer ◽  
I. R. Bricknell
Keyword(s):  
Salmo Trutta ◽  
East Coast ◽  
Sea Lice ◽  
Lepeophtheirus Salmonis ◽  
Marine Science ◽  
Sea Trout ◽  
Anterior Dorsal ◽  
Abundance And Distribution

Abstract Urquhart, K., Pert, C. C., Kilburn, R., Fryer, R. J., and Bricknell, I. R. 2008. Prevalence, abundance, and distribution of Lepeoptheirus salmonis (Krøyer, 1837) and Caligus elongatus (Nordmann, 1832) on wild sea trout Salmo trutta L. – ICES Journal of Marine Science, 65: 171–173. Lepeophtheirus salmonis (Krøyer, 1837) and Caligus elongatus (Nordmann, 1832) were found on 100% and 90%, respectively, of 30 wild sea trout from the east coast of Scotland. Mean abundances of the same two sea lice were 7.8 and 7.7, respectively. The distribution of the two species of sea louse differed, however, with a greater proportion of L. salmonis in the posterior and anterior dorsal regions, and a greater proportion of C. elongatus in the caudal and posterior ventral regions.

Natural diet of the tiger prawns Penaeus esculentus and P. semisulcatus

1987 ◽  
Vol 38 (1) ◽  
pp. 169 ◽  
Author(s):  
TJ Wassenberg ◽  
BJ Hill
Keyword(s):  
Regional Differences ◽  
Benthic Fauna ◽  
Gut Contents ◽  
Frequency Of Occurrence ◽  
Seagrass Beds ◽  
Natural Diet ◽  
Food Items ◽  
Moreton Bay ◽  
Harpacticoid Copepods ◽  
Common Items

Foregut contents of 702 P. esculentus and 426 P. semisulcatus collected from seagrass and offshore habitats in the Gulf of Carpentaria, Torres Strait and Moreton Bay between December 1983 and March 1984 were analysed, and the numerical composition and frequency of occurrence of food items in the diet were compared statistically. Periodicity in feeding was examined in adult prawns collected in hourly 20-min trawls overnight. Gut contents from these prawns were weighed and corrected for size by an empirically derived relationship V = 0.00931l2.818 between gut volume (V, �l) and carapace length (I, mm). The guts of both species were partially filled with food throughout the night. Bivalves, gastropods, ophiuroids, crustaceans and polychaetes were the most abundant food items of both species. Dietary composition overlapped for both species caught in the same trawl, but significant differences (P<0.05) were found in average numbers of pariicuiar items. No significani differences (P > 0.05) in numerical composition or frequency of occurrence of dietary items were found between the sexes of either species. Bivalves, gastropods and crustaceans were the most common items in juvenile and adult P. semisulcatus. Bivalves and gastropods were the most common food items in juvenile and adult P. esculentus. Bivalves were more common in adult than in juvenile P. esculentus. Ophiuroids were found more frequently with larger size of P. esculentus but were constant in all sizes of P. semisulcatus. The only meiofauna found in either species in significant numbers were harpacticoid copepods and these were found mainly in prawns from seagrass beds. P. esculentus and P. semisulcatus appear to eat similar taxa of benthic fauna. Quantitative differences between the diets of both species of prawns captured in the same trawl suggest that they are selective in their diet. Strong regional differences in diet were probably due to differences in the availability of prey.

Using Animal-Borne Imaging to Assess Green Turtle (Chelonia mydas) Foraging Ecology in Moreton Bay, Australia

2007 ◽  
Vol 41 (4) ◽  
pp. 9-13 ◽  
Author(s):  
Karen E. Arthur ◽  
Judith M. O'Neil ◽  
Colin J. Limpus ◽  
Kyler Abernathy ◽  
Greg Marshall
Keyword(s):  
Feeding Ecology ◽  
Green Turtle ◽  
Foraging Ecology ◽  
Chelonia Mydas ◽  
Lyngbya Majuscula ◽  
Imaging Device ◽  
Green Turtles ◽  
Moreton Bay ◽  
Turtle Population ◽  
Insight Into

Traditional techniques for studying green turtle foraging ecology, such as the analysis of food availability and ingested dietary material, have concluded that green turtles are primarily herbivorous but selective foragers. However, green turtles that forage during Lyngbya majuscula blooms are exposed to toxins produced by the cyanobacterium overgrowing the seagrass. We used the Crittercam, an animal-borne imaging device, to observe green turtle foraging behavior in Moreton Bay, Australia, and to evaluate the system for assessing the impacts of Lyngbya blooms on green turtles. Eight large green turtles were captured while foraging on seagrass flats and each was fitted with a Crittercam. The deployments yielded over 28 hours of video and associated time-depth records. Turtles swam almost continuously and rarely stopped to feed on seagrass. Six turtles were observed feeding and all six consumed gelatinous animals from the water column. This prey source was previously undocumented in the Moreton Bay green turtle population but described in other green turtle populations using the Crittercam. Only one turtle was observed foraging on seagrass. The results of this study indicate that Crittercam technology can provide insight into turtle diet selection and that it will be a useful tool in identifying the impacts of Lyngbya blooms on green turtle feeding ecology. This study has also demonstrated that turtles in Moreton Bay may have a more flexible diet than previously described, indicating they could potentially supplement their diet with alternate prey items when seagrass quality or quantity is compromised. Longer deployment times, with an initial acclimation phase, are required to more fully understand questions pertaining to feeding ecology.

scholarly journals Rising temperatures increased recruitment of brown tiger prawn (Penaeus esculentus) in Moreton Bay (Australia)

2016 ◽  
Vol 74 (3) ◽  
pp. 741-749 ◽  
Author(s):  
Marco Kienzle ◽  
David J. Sterling
Keyword(s):  
Environmental Variables ◽  
East Coast ◽  
Abiotic Factors ◽  
Fish Populations ◽  
Tropical Species ◽  
Fishing Industry ◽  
Southern Limit ◽  
Moreton Bay ◽  
Tiger Prawn ◽  
Stock Recruitment

Abiotic factors are fundamental drivers of the dynamics of wild marine fish populations. Identifying and quantifying their influence on species targeted by the fishing industry is difficult and very important for managing fisheries in a changing climate. Using multiple regression, we investigated the influence of both temperature and rainfall on the variability of recruitment of a tropical species, the brown tiger prawn (Penaeus esculentus), in Moreton Bay which is located near the southern limit of its distribution on the east coast of Australia. A step-wise selection between 60 environmental variables identified temperature as the most important environmental factor to explain the variations of recruitment between 1990 and 2014. Including temperature into the Beverton and Holt stock–recruitment relationship explained 69% of the recruitment variability compared with 9.5% when omitted. This analysis indicates that increasing temperatures have increased recruitment of brown tiger prawn in Moreton Bay.

Dermal toxicology of Lyngbya majuscula, from Moreton Bay, Queensland, Australia

Harmful Algae ◽  
2008 ◽  
Vol 7 (5) ◽  
pp. 584-589 ◽  
Author(s):  
Nick Osborne ◽  
Alan Seawright ◽  
Glen Shaw
Keyword(s):  
Lyngbya Majuscula ◽  
Moreton Bay

scholarly journals Studi Bioakumulasi Logam Berat Merkuri (Hg) Pada Teripang Lokal (Phyllophorus sp.) Dari Pantai Timur Surabaya – Jawa Timur [Study Of Bioaccumulation Heavy Metal Mercury (Hg) On Local Sea Cucumber (Phyllophorus sp.) From Surabaya East Coast – East Java]

2019 ◽  
Vol 5 (2) ◽  
pp. 181
Author(s):  
Rr. Febrina Anggraini Putri, Endang Dewi Masithah, Muhammad Arief
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Sea Cucumber ◽  
East Coast ◽  
Sea Water ◽  
Economic Value ◽  
Mercury Content ◽  
Quality Parameters ◽  
Value Range ◽  
Abundance And Distribution

Abstract Sea cucumber is a commodity fishery that is traded international. One of the sea cucumber that has economic value is the local sea cucumber (Phyllophorus sp.) believed that contain compounds can be immunomodulatory. Phyllophorus sp. is one of the three dominant species of sea cucumbers in abundance and distribution in the Surabaya East Coast (Winarni,dkk., 2010). Coastal environmental issues that deserve the attention is the problem of heavy metal pollution in coastal waters. The highest toxicity of heavy metals for aquatic animals and humans are mercury (Hg) (Widowati dkk, 2008). The purpose of this study was to determine levels of heavy metals bioaccumulation of mercury (Hg) in the local sea cucumber (Phyllophorus sp.) From the East Coast Surabaya and to determine the heavy metal content of mercury (Hg) in the local sea cucumber (Phyllophorus sp.) has exceeded the threshold or does not. The experiment was conducted on the East Coast Surabaya and analisys of heavy metal Mercury (Hg) in Balai Besar Laboratorium Kesehatan (BBLK) Surabaya. The method used is the method of field observation and analyzed descriptively. The results showed levels of mercury bioaccumulation of heavy metals (Hg) from BCFo-w value from 454.78– 802.05 and BCFo-s from 31,42 – 111,26. This shows Phyllophorus sp. have the ability to accumulate heavy metals with low until middle accumulation level category. Mercury content of the Phyllophorus sp. obtained range from 0.031 to 0.061 ppm, sea water ranged from 0.0015 to 0.0023 ppm and sediments ranged from 0.0417 to 0.112 ppm. Mercury levels in Phyllophorus sp. and sediment is below the NAB, but the sea water has exceeded from NAB. Water quality parameters are still in normal conditions in accordance with the quality standards KMLH (2004) that temperatures 26-28 º C, pH 7-8, salinity ranged from 28-29 ‰, DO value range 4-5 mg / L and brightness between 2-3 m.

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