SEAGRASS WATCH HERVEY BAY
After the flood in February , these meadows declined dramatically in abundance and distribution, with most plants dead by November The heavy seas uprooted shallow water and intertidal seagrasses. Seagrass abundance has fluctuated greatly at Urangan since monitoring was established in Mouth of the Burrum River on the western shore of Hervey Bay. Polycheate worms are common but gastropods were relatively scarce. The views expressed on this site are those of the authors and not necessarily those of the program’s supporters.
Percentage cover of macro-algae has continued to remain low. News Wind gusts of up to 56kmh battered the region at the weekend. The flood was only 0. Turbidity in this area is driven by wind and waves with meadows less exposed to rainfall related pulsed turbidity than for estuary meadows. The first observations will take place in September. The paucity of gastropods in seagrass meadows may due to low seagrass abundance ie less grazing matter and associated faunal prey. The areas of seagrass that showed little recovery were the shallow sub-tidal seagrasses m along Dayman Bank, immediately adjacent to the city of Hervey Bay. Seagrass abudnace at TG1 has remaned stable between years over the monitoring period.
Substantially reduced light conditions were logged by light meters at 4 sites coinciding with the fairway buoys and lead markers.
If you would like to volunteer, visit http: Estuary seagrasses in the region are susceptible to temperature related threats and desiccation due to the majority being intertidal.
It is unknown if these fluctuations ssagrass abundance are a long-term pattern. The abundance of polychaetes may be due to high supply of detrital matter, a known food source. In July seedlings of Zostera capricorni appeared.
Seagrasses are a major component of the Hervey Bay marine ecosystem and their contribution to the total watfh carbon production is the basis for such regionally important dugong and turtle populations and productive fisheries. The tidal range in this region is up to 4. Turbidity in this area is driven by wind and waves with meadows less exposed to rainfall related pulsed turbidity than for estuary meadows.
Volunteers needed for Seagrass-Watch program
Council News The policy has returned to council after a council vote was delayed. Seagrass abundance recovered significantly. On the western coastline of Hervey Bay Site codes: The seagrass abundance across the banks was higher than has been reported in many years after the impacts of floods and successive wet seasons. Dugong, turtle and shorebird feeding grounds Status Dec Sediment grain size became coarser between andpossibly aiding water clarity — this coincides with seagrass abundance.
Plant tissue nutrients suggest that Urangan meadows are in low light, nutrient rich environment with plants that are Nitrogen limited. Deepwater seagrass resources in Hervey Bay within the path of the flood plume also declined significantly in abundance six months after the impact and remained significantly lower than outside the impact area after nine months.
Recovery was also apparent in the deeper water seagrass communities of Hervey Bay, however in Februarydeepwater seagrass abundances at monitoring sites within the impacted area had recovered to near pre-flood levels.
Seagrass meadows in Hervey Bay are one of the largest single areas of seagrass resources on the eastern Australian seaboard. Polycheate worms are common but gastropods were relatively scarce. Herve grain size has become slightly coarser across all sites over the monitoring period.
Dugong and turtle feeding grounds. The flood produced a large freshwater plume of suspended sediments which extended 35 km north-west into Hervey Bay. The seagrasses in this area must survive pulsed events of terrestrial run-off, sediment turbidity and drops in salinity.
Hervey Bay seagrass
Coastal seagrasses in the region are restricted to the areas along the western shore of Hervey Bay. Dugong and turtle feeding grounds Status Dec Episodic macro-algal blooms occurred in late andhowever the algal abundances subsequently declined early in the new year.
Polychaete worms were abundant. Seagrass abundance has fluctuated greatly watcb Urangan since monitoring was established in These meadows were generally low biomass Zostera capricornior Halodule uninerviswith H.
Hervey Bay , QLD (Australia): Level 1: 29 – 30 August 2015
Mean temperatures at the coastal and estuarine locations generally follow a similar pattern. Feeding trails are regularly observed across the meadows. Approximately km2 of seagrasses in Hervey Bay was lost after two major floods and a cyclone within a 3 week period in Preen et al Seagrass-Watch HQ took the opportunity to recognise his longstanding commitment, dedication and contribution to Seagrass-Watch activities in the Hervey Bay region.
Search by keyword Search by location Search by category Add your business. Seagrass abundance increased significantly inbut declined in and not significnatly different than was observed when the site was established in late Seagrass cover has remained low, with significant increases at DD3 in and early Percentage cover of macro-algae has continued to remain low.
One of the participants who took the seargass to update his skills was Greg Lynch; the longest serving Seagrass-Watch participant globally. Maximum temperatures are significantly higher at coastal locations. The views expressed on this site are those of the authors and not necessarily those of the program’s supporters. Dugong feeding was absent until latecoinciding with seagrass recovery.