Rocky Reefs Provide Foraging Habitat For Dugongs In The Darwin Region Of Northern Australia

2002 ◽  
Vol 24 (1) ◽  
pp. 147 ◽  
Author(s):  
SD Whiting
Keyword(s):  
Large Scale ◽  
East Coast ◽  
Food Samples ◽  
Seagrass Beds ◽  
Western Pacific Ocean ◽  
Foraging Habitat ◽  
Mammalian Herbivores ◽  
Rocky Reefs ◽  
The Western Pacific

DUGONGS (Dugong dugon) are large mammalian herbivores found in tropical and sub-tropical waters from the east coast of Africa to Vanuatu in the western Pacific Ocean (Rice 1998). Foraging studies throughout their range indicate that their diet is dominated by seagrass (Marsh et al. 1982; Preen 1995; Preen and Marsh 1995; Anderson 1998; Das and Dey 1999). Aerial surveys (Marsh and Saalfeld, 1989; Preen et al. 1997), land-based and boat-based observations (Anderson 1982 1994; Aragones 1994) and satellite tracking data (Marsh and Rathbun 1990) indicate that dugong distribution is closely associated with seagrass beds. Algae is known to occur in food samples from dugongs (Heinsohn and Birch 1972; Marsh et al. 1982; Erftemeijer 1994; Preen 1995) but its presence in the diet has been described as incidental (Marsh et al. 1982) or linked to large-scale losses of seagrass (Spain and Heinsohn 1973; Marsh et al. 1982; Preen and Marsh 1995). This note contains opportunistic observations of long-term feeding by D. dugon on algal covered rocky reefs in the Darwin region of the Northern Territory.

scholarly journals The Dynamic and Thermodynamic Structures Associated with a Series of Heavy Precipitation Events over China during January 2008

2010 ◽  
Vol 25 (4) ◽  
pp. 1124-1141 ◽  
Author(s):  
Xiaohui Shi ◽  
Xiangde Xu ◽  
Chungu Lu
Keyword(s):  
Large Scale ◽  
East Coast ◽  
Heavy Precipitation ◽  
Chinese History ◽  
Physical Processes ◽  
Ice Storms ◽  
Upper Level ◽  
Upper Level Jet ◽  
The Western Pacific ◽  
Precipitation Events

Abstract In the winter of 2008, China experienced once-in-50-yr (or once in 100 yr for some regions) snow and ice storms. These storms brought huge socio economical impacts upon the Chinese people and government. Although the storms had been predicted, their severity and persistence were largely underestimated. In this study, these cases were revisited and comprehensive analyses of the storms’ dynamic and thermodynamic structures were conducted. These snowstorms were also compared with U.S. east coast snowstorms. The results from this study will provide insights on how to improve forecasts for these kinds of snowstorms. The analyses demonstrated that the storms exhibited classic patterns of large-scale circulation common to these types of snowstorms. However, several physical processes were found to be unique and thought to have played crucial roles in intensifying and prolonging China’s great snowstorms of 2008. These include a subtropical high over the western Pacific, an upper-level jet stream, and temperature and moisture inversions. The combined effects of these dynamic and thermodynamic structures are responsible for the development of the storms into one of the most disastrous events in Chinese history.

scholarly journals Using data from large scale farming operations to understand the importance of feeding the ewe to improve whole farm performance

2013 ◽  
pp. 97-102 ◽  
Author(s):  
D.R. Stevens ◽  
G. Young
Keyword(s):  
Large Scale ◽  
East Coast ◽  
Body Condition Score ◽  
Short Term ◽  
Management Decisions ◽  
Use Of Data ◽  
Condition Score ◽  
Farm Performance ◽  
Using Data

The collection and use of data from large scale farming operations provided significant insights into drivers of sheep performance. These drivers included minimum two-tooth liveweight at tupping, ewe condition and pasture cover at lambing and the importance of weaning weight on whole farm performance. Using this data to demonstrate the influence of management decisions resulted in an increase in average lamb liveweight gain between birth and weaning of approximately 20 g/day in Landcorp Farming Ltd East Coast flocks over the 4 years of monitoring. Lambing percentage was harder to change, though individual farms increased lambing percentage by up to 35% by concentrating on increasing feed allocation and maintaining ewe body condition score during winter. Low liveweight in some two-tooth ewes was inversely related to the percentage of dries in a flock and prompted more emphasis on growing replacement stock. The programme shifted focus from short-term tactical feeding and management decisions to long-term strategies such as stock and sales policies that placed the breeding flock as the major priority. Keywords: breeding ewes, data, lambing percentage, lambs, liveweight gain, whole flock analysis.

scholarly journals LARGE SCALE IMPACTS OF JETTIES AND TRAINING WALLS - EXPERIENCE ON THE AUSTRALIAN EAST COAST

2020 ◽  
pp. 2
Author(s):  
Angus Gordon ◽  
Lex Nielsen
Keyword(s):  
Large Scale ◽  
East Coast ◽  
Flood Mitigation ◽  
Rainfall Runoff ◽  
Littoral Drift ◽  
Adverse Impacts ◽  
Long Term Changes ◽  
And Training ◽  
Eastern Seaboard

Entrance jetties and training walls have instigated fundamental perturbations to coastal and estuary processes at several locations on the Australian eastern seaboard inducing long term changes to foreshore alignments, tidal current velocities, tidal plane elevations and marine ecologies with significant consequences, some having been realised only recently. This paper presents examples of long-term impacts of entrance jetties and training walls on coastal and estuary processes, gleaned from experience on the NSW coast. Jetties constructed at estuary entrances have the potential to alter fundamental coastal and estuary processes inducing changes that evidence indicates may take centuries to resolve. While many beneficial and adverse impacts of jetty construction have been known for many years, such as the improvements to navigation and flood mitigation from rainfall runoff and the interruption to littoral drift transport causing down-drift erosion, some impacts of jetties and training walls have not been well understood.Recorded Presentation from the vICCE (YouTube Link): https://www.youtube.com/watch?v=ARF55RPCPbA&feature=youtu.be

scholarly journals Multi-decadal trends in the tropical Pacific western boundary currents retrieved from historical hydrological observations

2021 ◽  
Author(s):  
Shijian Hu ◽  
Xi Lu ◽  
Shihan Li ◽  
Fan Wang ◽  
Cong Guan ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
Ocean Circulation ◽  
Large Scale ◽  
Western Pacific ◽  
North Equatorial Current ◽  
Western Pacific Ocean ◽  
The North ◽  
Tropical Western Pacific ◽  
Decadal Trend ◽  
The Western Pacific

AbstractAs large-scale ocean circulation is a key regulator in the redistribution of oceanic energy, evaluating the multi-decadal trends in the western Pacific Ocean circulation under global warming is essential for not only understanding the basic physical processes but also predicting future climate change in the western Pacific. Employing the hydrological observations of World Ocean Atlas 2018 (WOA18) from 1955 to 2017, this study calculated the geostrophic currents, volume transport and multi-decadal trends for the North Equatorial Current (NEC), the North Equatorial Countercurrent (NECC), the Mindanao Current (MC), the Kuroshio Current (KC) in the origin and the New Guinea Coastal Undercurrent (NGCUC) within tropical western Pacific Ocean over multi-decades. Furthermore, this study examined the contributions of temperature and salinity variations. The results showed significant strengthening trends in NEC, MC and NGCUC over the past six decades, which is mainly contributed by temperature variations and consistent with the tendency in the dynamic height pattern. Zonal wind stress averaged over the western Pacific Ocean in the same latitude of each current represents the decadal variation and multi-decadal trends in corresponding ocean currents, indicating that the trade wind forcing plays an important role in the decadal trend in the tropical western Pacific circulation. Uncertainties in the observed hydrological data and trends in the currents over the tropical western Pacific are also discussed. Given that the WOA18 dataset covers most of the historical hydrological sampling data for the tropical western Pacific, this paper provides important observational information on the multi-decadal trend of the large-scale ocean circulation in the western Pacific.

scholarly journals Product Authentication Using Two Mitochondrial Markers Reveals Inconsistent Labeling and Substitution of Canned Tuna Products in the Taiwanese Market

Foods ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 2655
Author(s):  
Chia-Hao Chang ◽  
Yueh-Tzu Kao ◽  
Ting-Ting Huang ◽  
Yu-Chun Wang
Keyword(s):  
Large Scale ◽  
Significant Proportion ◽  
Food Samples ◽  
Katsuwonus Pelamis ◽  
Regional Food ◽  
Vernacular Names ◽  
Canned Tuna ◽  
Seafood Products ◽  
Euthynnus Affinis

Fish of the tribe Thunnini represent a significant proportion of the stock caught by the fishing industry, with many of these fishes being collectively called tuna. However, only certain species can be used legally as an ingredient in canned tuna products, depending on regional food regulations. In Taiwan, only Thunnus species or Katsuwonus pelamis can be used as canned tuna. Here, we authenticated 90 canned tuna products, including 25 cat food samples, by sequencing two mitochondrial regions, 16S rRNA (16S) and the control region (CR). BLAST analysis revealed that Sarda orientalis, Euthynnus affinis, Auxis rochei, and Auxis thazard are all used as substitutes for legitimate tuna products. We found that 63.33% of investigated samples are true canned tuna, i.e., contain Thunnus species or skipjack tuna. We advocate that the Taiwanese government publishes an official standardized list of fishes, especially so that scientific, Chinese and vernacular names can be assigned unambiguously based on a “one species-one name policy”, thereby clarifying which species can be used in seafood products such as tuna. Furthermore, we feel that the large-scale and long-term monitoring of canned tuna products is warranted to fully assess the extent of tuna product adulteration in Taiwan.

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