Today we follow Kirsten, one of our marine scientists, in the second part a collaborative study with MPI and NIWA to survey blue cod in marine reserves.Continue Reading...
Archives For Marine Biology
This week is Seaweek (2-10 March), so to celebrate, we share an interview with sea lover and Technical Advisor (Marine), Andrew Baxter.
How did you become interested in marine biology?
I grew up on a mixed cropping and sheep farm in mid-Canterbury, miles from the sea, with a salmon fishing rod in one hand and a rifle in the other. I suppose my interest in marine biology began with family Christmas holidays as a kid at Kaikoura—plenty of rock pools to explore and fish to catch—and gradually unfolded while I was at Canterbury University.
Learning to dive at this time was also a big eye opener. From there I went to Taranaki for a couple of years, and then had a few years in Wellington before heading to Nelson in 1987 to work for DOC (where I have remained for more years than I care to count).
What is it about the sea that presses your buttons?
Definitely its mysteries. We know so little about it compared to the land—new things are being discovered all the time: from several new species each week, to the intricate complexities and linkages that tie everything together.
Also the sea’s vulnerabilities. The sea is hugely important to New Zealanders. Yet people often take it for granted because it’s huge and it looks “fine” from the surface. But take a closer look and it’s not as robust as we might otherwise think.
Why the interest in marine mammals in particular?
My job involves everything from snails to whales. However, with such a diverse array of marine mammals and the number of strandings we get, marine mammals can be a significant part of my job at times.
If whales are so smart, how come so many of them strand themselves on beaches?
Many of course simply die at sea from natural causes and wash up on our shores. Live strandings are more of a conundrum and there are many theories why whales and dolphins strand. In a lot of cases I suspect there is not just one causative factor but rather two or more in combination.
Like us, whales breathe air, and like us, they presumably will have a strong aversion to drowning. So when they become sick or injured a natural reaction will be to seek shallow water. For a highly social species, including pilot whales, their strong social bonds and natural instincts to look after one another can turn against them. One sick individual can lead to a chain reaction and a mass stranding unfolds.
Accidents happen (even for whales) and for a species that also echo-locates, gently shelving beaches like those in Golden Bay are particularly risky. The whales’ sonar disappears into the distance rather than being reflected back and Farewell Spit forms the perfect whale trap.
What’s the first thing people should do when they come across a stranding?
Contact DOC (0800 DOCHOT) and let us know all the details from location, species and number of animals to weather and sea conditions.
And the second?
Be careful! Whales (even the smaller ones) are hugely powerful and can cause serious injury if they lash out. In particular, avoid the area around the tail. If you are able to, keep the whales wet and covered with a sheet, avoiding the blow hole they breathe through.
Are we any closer to figuring out how to stop whales from stranding in the first place?
Not really. They are, after all, natural events.
People sometimes suggest putting in sonar reflectors, acoustic deterrent devices or underwater speakers that play orca sounds (or perhaps Barry Manilow music?). Aside from the question of cost, the difficulty is that whales are not totally stupid (despite what people might think from them stranding) and could just swim around or investigate them.
Several years ago we trialled the use of a bubble curtain—a compressor and a long perforated hose to create a wall of bubbles that reflect a whale’s sonar. It worked initially, but once one whale discovered it was effectively an illusion by accidentally breaking through the “wall”, they all began to ignore it.
Loud acoustic devices or ones that play orca sounds could cause panic and drive whales ashore. Also, we don’t want to drive away other species that inhabit coastal areas.
If you could talk to whales, what are some of the first questions you’d ask them?
Obviously, “Why can’t you get your act together and not strand?”
It would also be good to ask them what they think about our management of the oceans, from noise, pollution and “scientific whaling” to tourism and fishing. I also wonder if whales have forgiven humans for hunting some of them almost to extinction.
What is the strangest stranding you have attended?
A number of years ago I was phoned on Christmas morning about an orca stranded on HaulashoreIsland. Foregoing bacon, eggs and hash browns (that I had just cooked) and a bottle of cheap bubbly, I rushed down to Rocks Road with a colleague and some binoculars to check it out. There looked to be a small orca on the cobble shore, but with a blustery south-westerly blowing it was very hard to get a good view.
Luckily a hardy kayaker checked it out and discovered it was an inflatable plastic orca which must have blown off Tahuna Beach. After initially being pumped up to help rescue an orca, finding it was an inflatable whale was a bit of a let down. Suffice to say we left a bit deflated.
At the end of a stranding, what do you most take away from it apart from exhaustion?
Depending on the outcome, you can leave elated, frustrated or emotionally drained. Making some hard decisions around euthanasia can be very challenging emotionally. But the biggest thing I always take away from a large stranding is the sense of camaraderie from working alongside iwi, volunteers from near and far, and other DOC staff. Big strandings require a huge team effort.
What is it about New Zealanders’ treatment of the marine environment that depresses you the most?
The “out of sight, out of mind” syndrome, and the false presumption that the sea is vast and can cope with anything.
The attitude that it is always “someone else’s fault” is also frustrating. We are only going to make a difference through people taking personal responsibility. Even simple things such as not littering and sticking to the fisheries limits can make a huge difference if everyone does it.
And what gives you the most hope?
There are some very clever and astute young people coming through the education system. They are our biggest hope for the future. Working with community groups like Te Korowai o Te Tai o Marokura in Kaikoura has also shown me the power of local communities taking responsibility for their own areas.
If you were the benevolent dictator of New Zealand, what are a few of the first things you’d do to make it a better place?
Assuming I also had an open cheque book, I would provide significant funding to all the health, social and environmental community groups that are trying so hard to make a difference—often with so little.
If you were a marine mammal, what would you be and why?
There are two options here. The Andrews’ beaked whale (yes, there really is a whale called that), for no better reason than its obviously great name. Though if I had to choose just one, I would pick an orca (killer whale), simply because they are at the top of the food chain and don’t have to worry too much about anything else with sharp teeth and an empty stomach, except perhaps when young.
By Trish Irvine, Ranger Community Relations
After humble beginnings in January 2009 with only 22 Auckland youth, this year, MAD (Make A Difference) Marine launched its 5th year with a record 48 secondary school students from 25 schools across Auckland.
The three day leadership hui held on pest-free Motutapu Island kicked off city-side, at the Voyager Maritime Museum, with a welcome and blessing from iwi, a presentation by marine guru Roger Grace, and a talk about marine rubbish from Sustainable Coastlines. The students explored nearby city streets to identify and photograph rubbish-filled drains.
Once all the gear and food had been inspected for potential stowaways, we set off for Rangitoto Island which is linked by a causeway to the much older, Motutapu Island. On arrival, we walked in the sunshine to Motutapu Restoration Trust’s (MRT) nursery where students carried out various tasks to help the Trust.
Later, at our base (the Motutapu Outdoor Education Camp), there were presentations about marine mammals and ecological restoration on the island, followed by a night walk to see the freshwater ecology.
Day two began with a dawn walk up the hill to the WWII battery, and after breakfast, a beach clean-up led by the Watercare Harbour Clean Up Trust.
The groups really began to bond with each other and the natural environment during the rocky shore id session … “Aaah look at that tiny cushion star … There’s a cat’s eye … Do you see the half crab? … Who wants to hold the kina? … Can you feel its tube feet?”.
Kayaking proved to be challenging for some students but they determinedly overcame their fears. Snorkeling in the bay’s unofficial marine reserve revealed an underwater world that was less familiar but full of surprises—snapper up close. Auckland Council’s Waicare team introduced some science and the marine planning session encouraged student’s creativity. In the evening, student leaders inspired everyone with the actions they had taken in their schools and communities, outlining the support they experienced, and the barriers they faced and overcame to “make a difference”.
Did we mention the food? Each year, with great leadership from Cate Jessep Auckland Council, we provide food from scratch, with the help of the students. There’s pizza, French bread, pasta, sushi, salad dressings, stewed plums and biscuits!
On the summit of Rangitoto, students looked across to the city and contemplated their actions for 2013. Back down the hill, Marian from the Rangitoto Island Historic Conservation Trust shared a glimpse of a simpler time, showing students the (award winning) restored Bach 38 museum; how people connected with the land, re-used and salvaged materials to build these humble baches that are now an icon. After hilarious skits from each group we journeyed home exhausted and inspired.
And aside from the formal evaluations filled in by students we’ve had some fantastic unsolicited feedback:
“It was such an inspiring atmosphere to be amongst. Being surrounded by such motivated and change-making adults as well as young people made me feel a great sense of hope for years to come.
“In a society that focuses so much on the negative and so-called ‘dead-end’ state of the environment around us, it is refreshing to see people not only with the aspirations to make a change, but the motivation to follow through.
I hope to FINALLY implement a successful and efficient recycling system, beginning with a rubbish audit, upon my return to school. Although something more revolutionary would be more likely to fulfil my desire to make a change, I figure it’s best to start with baby steps.”
A parent’s feedback:
Please accept our thanks for providing such a fun and educational excursion. It sounded like it was full on but my daughter returned home with a fresh and perceptive understanding of why it is so important to look after the waterways.
“She has been treated to a rich experience in marine education and I hope this will manifest itself into becoming a responsible and assertive caretaker for the future.”
The challenge for students who attend MAD Marine is to take their learning and inspiration back to their schools and communities and “make a difference”. This is just the start of the journey, which is ongoing—with catch up events planned each school holiday where students share knowledge successes and challenges with each other, and participate in another volunteer event.
MAD Marine is a partnership between DOC and the Auckland Council. We share the enormous amount of planning and resourcing that makes this annual event such a success.