The Journey Of Native Seedlings Beginning At Our SPAs

With inputs from Angela S., hobby botanist, database lead and volunteer at the Wetlands Centre.

The thriving native plant life is what makes our wetlands places of immense beauty and wonder. Their roots nourish the land and help with nutrient recycling and removal of toxins.  Their lush cover provides shelter and habitat for our wildlife. 

They add so much character to the wetlands, reflecting seasonal changes like wetland moods – flowering, and shedding. These plants have evolved to adapt to the cyclical nature of wetlands so well, coping in ever-varying conditions of dryness, wetness, salinity or freshness. And if you observe the wetlands you will catch their different tones. 

It is incredible to imagine that these plants start their life as tiny seedlings that then grow into sturdy saplings and mature plants. We, at The Wetlands Centre, do our bit in helping our native plants flourish – by ascertaining the best times to collect seeds and factors for maintaining genetic diversity, collecting seeds, storing and cataloguing seeds, propagating seeds, potting on seedlings, and then planting and rehabilitating the bushland and wetland with native plants.

We work hand-in-hand with our team of volunteers, community members, and our primary sponsors – The City of Cockburn, who are keen supporters of our work. Our established wet and dry Seed Propagation Areas or SPAs and our fully equipped “Norm’s Nursery” is where the magic happens. We’ve been maintaining detailed records of all our efforts in a comprehensive database that is proving to be very helpful in our endeavours. All the collected data can be analysed for some fascinating trends and interesting insights. 

In this blog post, we offer you a tour of our SPAs and nursery, as well as our seed store and database. While we’re expanding our knowledgebase, we are eager to learn and incorporate from your experience. We hope you’ll be able to join us in our effort to preserve, conserve and rehabilitate our precious wetlands. 

 

Collecting and Storing Seeds

It takes special knowhow to collect seeds from native plants. Some seeds are incredibly toxic, like the bright red seeds from the Zamia, and collecting them can be tricky. A whole bucket of Banksia seedpods may produce just 10 seeds (or fewer) while, Juncus and Lobelia are more prolific and only one teaspoon worth of seeds may produce over 20,000 plants!

Norm Godfrey, a wetland visionary, was a pioneer in this science. We, till date, use the list that he compiled of what seeds are best collected when. For this and for his enormous love for the wetlands we have named our water-wise garden – “Norm’s Garden” and our nursery – “Norm’s Nursery”, in his loving memory.

We collect seeds from the bushland and wetland, and we involve volunteers in all tasks, including seed collection. The collected seeds are then catalogued and stored. They are sorted by the year of their collection when they are stored. We have seeds going back to the years 2002/2003 in our seed store!

 

The SPAs and Norm’s Nursery

The centre has one wet and one dry seed propagation area (or SPA). It is here that the seeds are propagated and transplanted. We use a handy (unofficial) zone guide to determine and pick the zones. 

Norm’s nursery is a little haven for our native plants. There are 139 native plants that are officially confirmed as local to our area (there may be more that are not confirmed yet) and we grow all of these. We currently have a maximum holding capacity of up to 22,000 plants!

The City of Cockburn is our primary sponsor and most generous supporter. We grow native plants for them that they then use to rehabilitate predetermined areas. Over and above this we also use the plants to rehabilitate areas within our precinct, such as Horse Paddock Swamp. We often announce our planting day events in advance and are joined by many involved and enthusiastic members of the community.

   

Our Comprehensive Database

Our comprehensive database is the cornerstone of our management efforts. We use the database to maintain records of all our seed collection, propagation, germination, transplanting and planting activities. 

We can use the database to extract specific insights – about the timelines for the various phases of seed propagation and if these coincided with any major weather events, about the yield for each batch and if there were factors contributing to an especially high/low yield, about the best methods and techniques for growing native plants, and about the amount of seed that will give us acceptable returns in terms of plant maturation. 

The database is also helping us make our operations more economical. For example, we now understand the quantity of seeds that we need to sow for the output we require, and we are not over-sowing or over-producing. We are also gathering information on seed viability and the various factors that affect plant health. For example, we were able to keep records of how much sodium bicarbonate we added per watering can and eventually worked out the best amount to bring liverwort and other mosses under control in the nursery. 

We are assimilating this information, gathering context and improving our processes continuously. This makes management a little more scientific, precise and predictable. 

 

Planting and Propagation Events

In our 26 years of landcare, education and conservation work, we have built a considerable knowledgebase. We are learning more and more about the behaviours of our native plants and the best ways of supporting them.

We are interested in sharing all the knowledge we have collected and we welcome groups and individuals to contribute, assist and partake. There is so much to learn and do together!

If you’re interested in what we do and want to help us in our efforts, come join us as a vollie. We will be delighted to have you. Optionally, you can join us for general landcare work on Thursdays and Fridays. 

No formal qualification or working knowledge of plants is required to volunteer.  Just an open mind and a willingness to learn and embrace new stuff. There are a range of diverse and interesting activities to indulge in. And our friendly team of staff and vollies will make it up to you with laughter, fun, a warm cuppa and lots of bikkies.

We encourage you to visit us or have a chat with us at The Wetlands Centre Cockburn – about how you can participate and help your local wetlands!

Our Wetlands In A Changing Climate

As ecosystems that thrive on so little, our wetlands are delicate. Yet they are abundant sources of water in this growingly water-starved world. They are carbon sinks, that remove and trap over 13% of the world’s carbon. They are biodiversity hot-spots where some of the most beautiful and unique species live and flourish.

While we are fortunate to still see wetlands around us, their survival is threatened. They are exhibiting what the scientists are calling a ‘distress syndrome’, wherein, their functional capacity has been radically impaired. Their plant and animal distributions have been drastically altered. And there are several disturbances, induced stresses and a range of pressures that are making their fragile ecosystems imbalanced.

Image of a starving polar bear on a melting ice sheet

Much of this has been the result of climate change. A topic that is heavily discussed but less understood in the context of wetland conservation and rehabilitation. It is only gradually becoming clear that climate change impacts each wetland in a specific and unpredictable way. And it is through constant monitoring, research, on-ground work and active participation that some of the impacts can be stalled or even reversed.

Our conservation efforts at Bibra Lake and North Lake, within the Beeliar Regional Park, have been remarkable. Through the course of our work, we are constantly learning about the nature of our wetlands, their many unseen facets and how they respond to a steadily shifting environment.

In this article, we draw a sketch of the strengths and weaknesses of our dynamic Beeliar Wetlands as they stand the test of a changing climate. And what it will take for them to survive this massive global event.

Understanding climate change

Climate change is perhaps the greatest issue confronting us today!  As greenhouse emissions continue to rise it is predicted that global temperatures could increase anywhere between 1-5 degrees in the 21st century.


This video from NASA’s Climate Change website, highlights global temperature anomalies. 2018 and 2017 were the fourth and second hottest years respectively since modern record-keeping began in 1880. NASA and NOAA work together to track the temperatures, part of ongoing research into our warming planet.

Major atmospheric changes drive hydrological changes. So, global warming at that scale can lead to prolonged droughts in some areas and pronounced precipitation in others. Hydrological changes further drive hydrogeological changes affecting groundwater recharge and water purity. These changes themselves are enough to degrade some wetlands considerably.

The continuing rise in temperatures also threatens species who depend on the wetlands for survival. Waterfowl are susceptible to changes in temperature and precipitation. For migratory birds, the climate affects their habitats as well as the migration corridors. For other species whose breeding cycles are tied closely to the climatic conditions, the rise in temperatures makes the situation unfavourable.

Climate change has a range of other impacts on the wetlands themselves, their ability to recycle and process nutrients, how they absorb and trap carbon and process sediments to generate soil. These activities further impact the distribution of flora and fauna, favouring some over the other. Invasive species thrive and change wetland ecology, damaging habitat and food source.

The stresses of climate change are only heightened by human activity – urbanization and pollution.

Climate change and Beeliar Wetlands

The Beeliar Wetlands is the name given to the two chains of wetlands that run parallel to the west coast of Western Australia. While one chain of lakes is saline, the other is freshwater. The wetlands are located towards the southwest portion of metropolitan Perth within the larger Beeliar Regional Park.

The wetlands on the Swan Coastal Plain and in particular the Beeliar Wetlands are a surface expression of the underlying groundwater.  There is still much to be learnt about the effects of climate change on our wetlands.  What the data shows us is that for about the last 40 years we have been receiving less rain.

Groundwater levels have never been static, decreasing during summer and increasing when recharged with winter rain as water makes its way through the soil to groundwater.  With decreasing rainfall, the groundwater recharge has decreased and levels have dropped. Together with the decreasing recharge, there has also been incessant removal of groundwater to supplement our supply of drinking water.

In most cases, this has led to our wetlands drying out more often or for prolonged periods each year. But, bear in mind, a drying wetland is natural and it is during the drying times that those intrepid birds fly in from Siberia to eat the bugs out of our mud.  It’s tricky business and honestly, none of us have the whole story.

The unpredictable changes in the lakes drying and filling have also complicated our revegetation efforts.  While in general we are allowing for increased dry conditions and adjusting the zones in which we plant, on several occasions we have been caught with heavy summer and spring rain events inundating some of our plantings.  These conditions highlight the need for Adaptive Management.

It is not only the wetland and wetland vegetation that is affected by this lowering of the water table.  Many of our bushland species also depend on groundwater for survival.  This became very evident during the particularly low rainfall season of 2010-11 when many banksias higher in the landscape of our bushland died.

Changes in global climate may well be a contributing factor on groundwater levels, but healthy well-maintained wetlands can also be a key tool in our efforts to lessen the impact of climate change on other systems.

Here’s taking a closer look at the Beeliar Wetlands and how climate change has impacted some of the wetland functions.

1. Changing Hydrology:

The Beeliar Wetlands depend on seasonal rain to recharge. Over the years there have been fluctuations in the amount of precipitation. These fluctuations have caused alterations in wetland zonation, impacting the distribution of native plant species within the wetlands.

2. Loss of biodiversity:

With changing zonation, wading species and waterfowl are impacted.  Constant encroachment has led to a serious habitat loss, loss of fringing vegetation and bushland. This has further impacted species such as turtles, frogs, snakes and lizards many of which are endangered.

3. Carbon loss:

With many of the wetlands now experiencing a dry spell and terrestrialisation, the carbon trapped within the soils is released back into the atmosphere. And there is a further loss in capacity to capture and trap carbon from the atmosphere due to the growing number of dysfunctional and degraded wetlands.

Read our blog post on ‘Saving Bibra Lake’ for an in-depth examination into our conservation and rehabilitation efforts on Bibra Lake and North Lake.

Preventative measures

The wetlands are facing an incredible amount of stress from climate change alone, and we have to realize the importance of reducing additional pressures. This will give our wetlands a fighting chance to cope and replenish.

While most of us have come to accept the reality of human-caused changes in our global climate, we must also step up to the task of addressing the impacts of these changes.  There are many actions we can take locally to help our wetlands through this period.

Here are a few ways in which we as individuals and community can help:

  1. Reduce waste. Don’t litter.
  2. Conserve water. Be judicious. Click this link to check out Watercorp’s tips for saving water.
  3. Recycle and reuse to the maximum extent.
  4. Reduce your carbon footprint.
  5. Walk or cycle wherever you can. Or use public transport.
  6. Grow native plants in your garden. Go organic. Be fertilisewise!
  7. Participate in wetland activities. Volunteer with The Wetlands Centre.

Don’t forget to quack, quack, quack…  That is wetland speak for talk, talk, talk…  Pass on the message to friends and family.  Tell them about waterwise, fertilisewise and of course, volunteering.

Join The Wetlands Centre Cockburn

At ‘The Wetlands Centre Cockburn’, we are located a hop, skip and jump away from the glorious Bibra Lake, within the Beeliar Regional Park. Our proximity stirs and inspires us to work with the community to safeguard and protect this amazing yet fragile asset.

Community Planting Event at Horse Paddock Swamp in the Beeliar Wetlands

We have seen remarkable progress over the 25 years we have been around and are always looking for new helpers.  If you are not into getting down and dirty, we have education programs that need helpers too!

Combating climate change will take all our effort. Come join our forces today. Together let us maintain and improve the resilience of our wetlands so that they can continue to provide important services to us and the coming generations, even under changed climatic conditions.

A Protective Circle: Why Safeguarding Wetland Health Begins With Ensuring A Healthy Buffer Zone

A wetland landscape in black & white with only the fringin vegetation coloured in it's original green.

Located only a hop, skip and jump away from our very doorsteps, wetlands are closer and more accessible than ever before! We are fortunate to have them in our direct vicinity like this. But for the wetlands themselves, that are often surrounded by busy roads, cycle tracks and pedestrian pathways, disturbed by invasive activities of humans and domestic/feral animals alike and degraded by pollution, nutrient explosion and urban runoff, this proximity can prove costly!

A healthy buffer zone can help in these situations, as a simple yet effective solution. A buffer zone with ample vegetation and thick foliage distributed around the wetland periphery acts like a protective circle safeguarding our delicate wetlands. Wetland buffers can significantly reduce exposure, bolster wetland function and minimize damage and degradation. So much so that their establishment has been encouraged and enforced by wetland management authorities around the world.

In this article, we take a closer look at some key questions: What does a healthy buffer zone look like? What does it mean for our wetland health? And, how can we help our landcarers establish and maintain adequate buffer zones around the wetlands?

 

What is a buffer zone?

The wetland buffer zone is an area of fringing vegetation, which usually begins from the periphery of the wetlands and extends outwards. Pretty much like a border around the wetland.

The buffer zone can vary in size and nature – it can be several meters wide or narrow, and it can contain a variety of wetland plants, shrubs and bushes. Its nature may also vary depending on recommendations for a particular wetland:

  • The noise and visual screening requirements – a thicker and more effective screening may facilitate the nesting and breeding of certain wetland species,
  • The conservation significance of the wetlands – more significant wetlands may require a thicker belt for the buffer,
  • And, the safe-distancing from the nuisance of insects – For example, mosquito producing wetlands are required to be at least 2km away from residential areas depending on the severity of the nuisance.

 

Why are buffers important?

Buffers are important, not just for the preservation of our environmental assets, our wetlands, but also for protecting the plant and animal wildlife that inhabit them. They aid in wetland function, ensuring wetland ecosystems thrive and flourish.

Here are a few more reasons why wetland buffers are essential:

  1. They absorb surplus water from surface runoffs, floods and storm drains.
  2. They reduce the nutrient, pollutant and sediment loads in runoffs.
  3. They help maintain the water quality in the wetland catchments by filtering out pollutants and sediments to a considerable extent.
  4. They provide habitat, shelter, and feeding/breeding/nesting grounds for wetland wildlife.
  5. They reduce disturbance to native flora and fauna from surrounds, creating safe corridors for wildlife.
  6. They reduce the invasion of weed species by keeping the vegetation dense and impenetrable.
  7. They provide for areas of recreation and engagement within the wetlands – trails for bushwalking, wildlife photography or amateur birdwatching.

 

What does a healthy buffer look like?

A buffer may differ considerably from wetland to wetland, depending on the features and requirements. However, there are a few common features that are shared by all healthy buffer zones. For example, a buffer should be at least 50 metres wide. They can be wider, not narrower. The buffer should be effective in keeping invasive species such as weeds and feral animals out. And, you can often tell of its effectiveness by its density, biodiversity and the health of the vegetation in the buffer. Similarly, a healthy buffer will keep its wildlife well protected and nurtured within its confines, with little need for them to venture out!

 

What can we do to help?

Our constant activities with little regard to our fragile wetlands, as well as the more permanent changes in the environment, have drastically impacted our wetlands. Our wetlands are threatened and need our help! The wetland buffers are perhaps the best way to begin.

Here are a few ways we can help our wetlands:

  1. Think of ways to minimize disturbance to the wetlands. Be sensitive to the movements of wetland creatures. Beware of plants that are growing or sprouting.
  2. When walking/cycling stick to the pathways. The pathways, trails and tracks are designed to lead away from environmentally sensitive areas within wetlands.
  3. Do not discard your garden waste – cuttings and prunings, or waste from aquariums or terrariums directly into the wetlands.
  4. Do not let your pet animals – cats, dogs and/or rabbits, stray in wetland areas. Animals are known to prey upon the vulnerable wetland wildlife. Collect and discard your pet’s faeces appropriately and do not discard in the wetlands. Pet faeces are a detriment known to contribute nutrients and, in some cases, carry weeds.
  5. If the buffer zone around your wetlands is at risk due to human activity, building, construction or development work, or being along roadside, highways or curbs with heavy traffic, a light fence can be erected in order to shield it.
  6. If the fringing vegetation and buffer around your wetlands appear to be disturbed or degraded, contact your local landcarers or wetlands facility. Note: Only specific native vegetation may be grown as buffer vegetation. Do not plant without advice!
  7. Participate in community planting, weeding and landcare events. Take an active interest in the health of your wetlands.

Why not get involved with us?

At ‘The Wetlands Centre Cockburn’, here in the heart of the breathtaking Beeliar Regional Park, we are working towards building healthier wetlands for everyone.

We are involved in landcare, conservation and rehabilitation work. We run some exciting educational programs. We are community driven, we have a fantastic community outreach. And, we are pioneers in wetland management.

With a dedicated team of volunteers and staff and our love for wetlands, we are doing just what it takes. Come join the team and get involved with us today. Together we can make a difference!

Wetlands & Water. Rehabilitation & Conservation.

A bird's eye view of a wetland and its evirons

Watching our wetlands transform is an awe-inspiring experience. We may see change with seasons. Or, through circulation of life-giving water and rainfall. The transformation is evident in the way their vegetation thrives, blooms and blossoms. Within the catchments where delicate ecosystems flourish as diverse organisms interact with each other and with the environment. And, in the cacophony of bird and animal sounds that fills the air with every favourable shift.

Water brings out the unique character of our wetlands.

Not all wetlands are waterlogged all the time, some depend on groundwater and others on surface water flows and still others are coastal wetlands that are revived by the seas. They may be seasonally, intermittently or permanently drenched. They may be saline or freshwater. They may be still or flowing. No matter what the nature of the wetland, water plays a central role.

 

Wetlands – A Living System

Wetlands support complex and diverse bionetworks. They shelter and sustain wildlife. Here landforms and soils are created, nutrients are naturally recycled and waterways are filtered and cleaned.

The specialized wetlands vegetation helps in stabilizing the soil, cleaning the water and providing resources and habitat. From upland vegetation – shrubs and trees, to fringing vegetation – sedges, rushes and paperbark trees, and floating and submerged aquatic plant-life – adequate vegetation is fundamental to wetland health.

Leaves or branches that fall from overhanging trees and shrubs are broken down by microbes, bacteria and fungi. These, in turn, become food for larger animals within the food web. And wetlands ecosystems are sustained by the functions of these tiny organisms.

 

Wetlands and Water

Wetlands that see water once every few years, or those that are permanently waterlogged, every wetland ecology is unique. Species of plants and animals have evolved to suit these very specific conditions of dampness, salinity and nutritional availability.

Urban and rural encroachment have posed some serious threats to the wetland ecology.

Paved roads and concrete structures mean that a greater volume of water now finds its way into the wetlands. Road run-off often contains oil, heavy metals and various other substances that leach into the wetlands. Fertilizers, pesticides and chemicals from nearby home gardens or agricultural fields too seep into the groundwater, from where they travel to the wetlands.

Environmental degradation has caused drastic changes in the water cycle. Wetlands now face prolonged inundation or drying and a constant change in the physical, chemical and biological composition of water entering the wetlands. This imbalance adversely impacts native species that are unable to survive or cope. Further, loss of native vegetation has the potential to disrupt and collapse the delicate wetlands food web.

 

Wetlands Rehabilitation

Our wetlands are an important and essential resource. They provide us with a natural filtration system, cleaning our waterways of harmful pollutants, absorbing and trapping carbon in the marshy soil, and replenishing our groundwater and underground aquifers. Wetland plants and animals function to strengthen this delicate link between water and wetlands.

They help regulate the climate. They supply food, fibre, fuel and medicinal plants.

Above and beyond the functions they fulfil, wetlands are a source of great beauty. They are gateways to adventure and for “experiencing nature” away from the hustle and bustle of our cities and suburbs. The abundant life they support – from native species to migratory long-distance travellers. The deep interlinkages and connections, and the balance they restore.

Wetlands rehabilitation is, therefore, the single most crucial calling of our time – revegetation, habitat restoration, conservation and protection. An involved community and teamwork. And spreading awareness about their importance.

 

A water level guage mirrored on a still wetland surface.

Water Conservation

Inland freshwater wetlands provide water to over three billion people around the world.

Without our wetlands, the water in our households, industries and farms would have been unusable.

Water conservation is a vital aspect of wetlands rehabilitation work. It involves using and uncovering innovative wetlands management techniques that help control the quality of water within catchments.

Water Sensitive Urban Design Principles, in the context of urban wetlands, protect the wetlands from urban run-off and degradation. Applying these principles ensures that the infrastructure we create does not impact them unfavourably.

Water conservation is also largely dependent on the native plant and animal species, their distribution and propagation. And on our sustained rehabilitation efforts.

 

Come, Get Involved!

At ‘The Wetlands Centre Cockburn’, here in the heart of the breathtaking Beeliar Regional Park, we are working towards building healthier wetlands for everyone.

We are involved in landcare, conservation and rehabilitation work. We run some exciting educational programs. We are community driven, we have fantastic community outreach. And, we are pioneers in wetlands management.

With a dedicated team of volunteers and staff, and our love for wetlands, we are doing just what it takes. Come join the team and get involved with us today. You can make a difference!