biology

Posidonia australis seagrass meadows of the Manning-Hawkesbury ecoregion

Posidonia australis seagrass meadows of the Manning-Hawkesbury ecoregion is a biology topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Posidonia australis seagrass meadows of the Manning-Hawkesbury ecoregion rather than just read about it. In short: Posidonia australis seagrass meadows of the Manning-Hawkesbury ecoregion is an endangered ecological community, listed under the EPBC Act of the Commonwealth of Australia on 7 May 2015 Description The ecological community is "the assemblage of plants, animals and micro-organisms associated with seagrass meadows dominated by Posidonia australis occurring in the warm temperate Manning Shelf and Hawkesbury Shelf bioreg…

Key takeaways

Posidonia australis seagrass meadows of the Manning-Hawkesbury ecoregion belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Posidonia australis seagrass meadows of the Manning-Hawkesbury ecoregion to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Posidonia australis seagrass meadows of the Manning-Hawkesbury ecoregion from memory before moving on to harder problems.

Reference excerpt

Posidonia australis seagrass meadows of the Manning-Hawkesbury ecoregion is an endangered ecological community, listed under the EPBC Act of the Commonwealth of Australia on 7 May 2015

Description The ecological community is "the assemblage of plants, animals and micro-organisms associated with seagrass meadows dominated by Posidonia australis occurring in the warm temperate Manning Shelf and Hawkesbury Shelf bioregions on the east coast of Australia." It occurs subtidal waters at depths from less than 1 m to 10m within the sheltered environments of estuaries on the coastline from Wallis Lake to Port Hacking. It is found on sand and silty mud and in these estuarine waters the salinity is close to marine levels. The meadows of the community occur as both monospecific meadows (of P. australis) or as multispecies meadows (with, for example, P. australis together with Zostera muelleri subsp. capricorni, Halophila ovalis). The macrophyte, Ruppia, may also be found growing within the ecological community (Creese et al., 2009). The leaves of Posidonia australis provide a place for many benthic flora, including epiphytes, to grow. These epiphytes photosynthesise and their proportion within the meadows is largely dependant on the nutrients available in the water. Fauna found within the shelter of the meadows include: protozoans, bacteria, harpacticoid copepods,ostracods, nematodes, polychaetes, bivalves, amphipods, cumaceans, holothurians, phoronids, rotifers, isopods; small decapods, gastropods, pycnogonids, echinoderms, nemerteans, hydroids, bryozoans, sponges; ascidians; serpulid polychaetes, and fish.

Threats Coastal development Dredging Boat mooring and boating activities Catchment disturbance and pollution Climate change

Further reading J.J. Burchmore; D.A. Pollard; J.D. Bell (March 1984). "Community structure and trophic relationships of the fish fauna of an estuarine Posidonia Australis seagrass habitat in port hacking, new South Wales". Aquatic Botany. 18 (1–2): 71–87. doi:10.1016/0304-3770(84)90081-0. ISSN 0304-3770. Wikidata Q107919737. J. Fitzpatrick; H. Kirkman (1995). "Effects of prolonged shading stress on growth and survival of seagrass Posidonia australis in Jervis Bay, New South Wales, Australia" (PDF). Marine Ecology Progress Series: 279–289. ISSN 0171-8630. Wikidata Q107919867. Neil Saintilan; Kamal Hossain; Debashish Mazumder (3 February 2007). "Linkages between seagrass, mangrove and saltmarsh as fish habitat in the Botany Bay estuary, New South Wales" (PDF). Wetlands Ecology and Management. 15 (4): 277–286. doi:10.1007/s11273-006-9028-0. ISSN 0923-4861. Wikidata Q60552150. D.I Walker; A.J McComb (January 1992). "Seagrass degradation in Australian coastal waters". Marine Pollution Bulletin. 25 (5–8): 191–195. doi:10.1016/0025-326x(92)90224-t. ISSN 0025-326X. Wikidata Q107919934. Kieryn Kilminster; Kathryn McMahon; Michelle Waycott; et al. (25 April 2015). "Unravelling complexity in seagrass systems for management: Australia as a microcosm". Science of the Total Environment. 534: 97–109. doi:10.1016/j.scitotenv.2015.04.061. ISSN 0048-9697. PMID 25917445. Wikidata Q39136176.

References

Illustrations

Worked examples

Example 1 — a first encounter with Posidonia australis seagrass meadows of the Manning-Hawkesbury ecoregion

Start with the simplest possible case. Write down what Posidonia australis seagrass meadows of the Manning-Hawkesbury ecoregion claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Posidonia australis seagrass meadows of the Manning-Hawkesbury ecoregion before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Posidonia australis seagrass meadows of the Manning-Hawkesbury ecoregion ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Posidonia australis seagrass meadows of the Manning-Hawkesbury ecoregion

In research: Posidonia australis seagrass meadows of the Manning-Hawkesbury ecoregion appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Posidonia australis seagrass meadows of the Manning-Hawkesbury ecoregion in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Posidonia australis seagrass meadows of the Manning-Hawkesbury ecoregion is common in secondary-school and first-year university syllabi. It links to neighbouring topics Ecoregions of Australia, Endangered ecological communities, so understanding it makes those chapters shorter.
In everyday life: Look for Posidonia australis seagrass meadows of the Manning-Hawkesbury ecoregion outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Posidonia australis seagrass meadows of the Manning-Hawkesbury ecoregion in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Posidonia australis seagrass meadows of the Manning-Hawkesbury ecoregion means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Posidonia australis seagrass meadows of the Manning-Hawkesbury ecoregion out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Posidonia australis seagrass meadows of the Manning-Hawkesbury ecoregion in simple terms?

Posidonia australis seagrass meadows of the Manning-Hawkesbury ecoregion is an endangered ecological community, listed under the EPBC Act of the Commonwealth of Australia on 7 May 2015 Description The ecological community is "the assemblage of plants, animals and micro-organisms associated with sea…

Why does Posidonia australis seagrass meadows of the Manning-Hawkesbury ecoregion matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Posidonia australis seagrass meadows of the Manning-Hawkesbury ecoregion?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Posidonia australis seagrass meadows of the Manning-Hawkesbury ecoregion.