The New Zealand Sea Lion – A Conservation Comeback and Conundrum

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Adult female New Zealand sea lion
Adult female New Zealand sea lion

Walking through the undulating dunes, I saw a big furry creature swaddled in the couch grass. The shaggy beast looked a lot like a bear, but we were in the wrong domain for such a creature. I was out leading a tour group in my capacity as a wildlife guide. The location was South Island, New Zealand and the animal that lay before us was the New Zealand Sea Lion, which is genetically related to bears. A thick pelt of fur envelopes their body and the male acquires an impressive mane around his neck as he matures. Like his terrestrial cousin, the New Zealand Sea Lion is a top predator: His quarry tends to be fish, squid, octopus, crabs and the occasional penguin.

Adult male sea lion
Adult male sea lion

On Sea lions, the razor-sharp claws of a bear have been sheathed inside a membranous flipper. This flipper propels them through their watery lair, as well as allowing them to capture prey. The Sea Lion also has a thick layer of blubber, which insulates it from the frigid water as it descends to deeper realms.Much of the population lives on the subantarctic Campbell and Auckland Islands, with a tiny population living on the mainland. The species’ conservation status is listed as ‘’nationally critical’’– the highest threat status given in New Zealand. In short, the New Zealand Sea Lion is one of the most threatened Sea Lions in the world, and quite possibly the rarest.

Waiting for Mum
Waiting for Mum

NEW ZEALAND SEA LION HISTORY

No humans lived in New Zealand until about 1,000 years ago, when Maori tribes arrived from Polynesia and settled around the country, subsisting on various plants and animals. Over time all of the Sea Lions were decimated for food and fur– first by the Maori and later by European settlers. By the 1800s, the Sea Lion was extinct in New Zealand. In 1993, a lone female New Zealand Sea Lion was found by a farmer at Taieri Mouth, on the lower South Island. The farmer contacted the Department of Conservation, confused about the “blonde seal” he found on his property. This female (subsequently called “Mum”) had been tagged by researchers as a pup on the Auckland Islands in 1986. For reasons unknown, she’d traveled 435 miles to settle on New Zealand’s Otago peninsula. She also happened to be pregnant. Females are not known to venture far from where they were born, so Mum’s epic journey was all the more remarkable.

Adult female coming ashore
Adult female coming ashore

THE POPULATION REBOUNDS

Mum’s solo journey became a beacon of hope for this flagging species. Males from the subantarctic islands had begun populating the Otago peninsula in the early 1980s. With the arrival of Mum and the birth of her daughter, this was the beginning of a small breeding population. Over the next 17 years Mum produced 11 pups, many of which were female. Each pup born on the South Island is very precious, particularly to the New Zealand Sea Lion Trust and the Department of Conservation. These organizations keep a close watch on the New Zealand Sea Lion population, both on the mainland and the islands. Every Sea Lion pup that has been born on the mainland since 1993 has been tagged and named. Mum’s first pup, named Katya, went on to have 10 pups of her own. When new pups are born, every effort is made to keep them safe from potential threats, including dogs.

Sea lion pup
Sea lion pup

THE SOUTH ISLAND SEA LION EXPANSION

The South Island population has since grown to approximately 160 Sea Lions, but only a tenth or so are female. This skew in the sexes creates an interesting, sometimes lethal social dynamic. When male/female ratios are more natural, a harem system exists: The strongest mature males (or “bulls”) fight for the right to breed with a number of females. This dominant male, known as the beach master, can preside over up to 25 females. This type of harem is often seen around the Auckland and Campbell Islands, where New Zealand Sea Lions are found in greater numbers. On the South coast beaches of the Otago peninsula and the Catlins, the low numbers of female sea lions has resulted in some confusion. Sexually charged males look– sometimes in vain– for females to corral into a harem of their own. Juvenile males look similar to females, being both lighter in color and smaller than the beach masters. Mature males can weigh from 250-400 kgs, while mature females weigh between 100-160 kgs. As the male develops, his fur turns from a light brown/tan color to dark brown and the thick mane around his neck becomes more impressive. Females are very pale by comparison (almost the color of sand), and blend in exceedingly well with their surroundings.

Male with 'harem'
Male with ‘harem’

An amorous male in these areas, having seen a juvenile male approaching his patch, will sometimes approach the young interloper. Their initial exchanges can range from bluff and bluster, to playful interactions, to the older male actually seducing the younger. It’s not unusual along the Otago coast to see a large male surrounded by his “women,” which are actually juvenile or sub-adult males! When a bona fide female is in the area, it can create quite a stir and become a challenging encounter for her. Males sometimes run at her en masse, blocking her path back to the water to escape. She can be particularly vulnerable if she has a young pup with her. In all the excitement, some females have inadvertently been killed from too many males wanting to mate with them. Despite these issues, it’s a positive sign to see New Zealand Sea Lion numbers slowly but surely increasing. Since Mum arrived on the mainland, an unrelated female named Marea settled in the Catlins in 2006 and proceeded to breed there. Their offspring have now established small breeding populations on South Island as well as Stewart Island, a small inhabited island located to the south.

Juvenile male
Juvenile male

CURRENT CONSERVATION CONCERNS

In the subantarctic islands the numbers of New Zealand Sea Lions has been steadily dropping. The breeding population decreased by 50% between 2000 and 2015, and there are now only around 9,000 remaining. The reasons for the decline are numerous. There’s a large squid fishing industry off Auckland and Campbell Islands, where Sea Lion deaths have been caused by accidental bycatch in fishing nets and trawls. When a female dies, she most likely orphans a pup onshore, who will die without her. She’s also likely to be pregnant with another pup. Two other serious problems are disease and starvation. In 1998 an outbreak of an unknown disease caused the deaths of over 50% of the pups and 20% of the females in the Auckland Islands. In 2002 and 2003 the Sea Lions suffered heavy mortalities due to the bacterial infection Klebsiella pneumoniae. This caused the deaths of 32% of the pups within the first few months of life in 2002 and 21% in 2003.

Adult female
Adult female

Reduced prey availability is another major cause of adult and pup mortality. A significant death toll was exerted on the Campbell Island population this year, with 58% of the pups dying within the first month. Studies indicated that starvation was responsible for the deaths of 62% of the dead pups that were necropsied. Unfortunately local fisheries target some of the same species that Sea Lions predominantly feed upon. This competition for resources is an issue, particularly with females whose feeding ranges are restricted while their pups are young. At the current rate of Sea Lion decrease around the Auckland and Campbell Islands, there is genuine concern for the future of this beleaguered population.

Sea lion pups
Sea lion pups

Suzanne Burns 2015. Photo credits: Shaun Templeton.

Source: Green Global Travel

How I fell in love with wild and wonderful New Zealand

Posted on Leave a commentPosted in BLOG, New Zealand, PUBLICATIONS, Wildlife

The wind whipped through me and wailed in my ear, heralding the oncoming winter. As I walked through the city, slightly cowed by the wind I noticed an odd sight. Lots of young people, most likely third-level students, were walking around in t-shirts, shorts and flip flops, seemingly oblivious to the bitter cold. I walked past them baffled and slightly bemused and wondered why on earth they would punish their bodies this way?

I moved to New Zealand in 2005 and settled in to life in a picturesque university city called Dunedin on the lower end of the South Island. I chose this as my home as I was easily able to pick up work in my field, as a zoological researcher and later as a wildlife guide. The fact that it was surrounded by golden sandy beaches, prolific wildlife and a vibrant student atmosphere didn’t hurt either. Dunedin prides itself on its excellent university and the fact that it is the sea bird capital of the world.

Northern Royal albatross-Suzanne Burns
Northern Royal albatross-Suzanne Burns

You can drive 40 minutes from the city and see penguins and albatrosses at the end of the peninsula. When it comes to our feathered friends, there is something to be said for the birds in Dunedin. These albatrosses are huge, 10 feet from wing tip to tip (that is almost two people lying end to end). If you drive up to their nesting grounds at Taiaroa Head on a windy evening, you can watch these enormous avians eclipse the sun as they wheel around in glorious synchronicity.

And then there are the yellow eyed penguins. Not only are they extremely anti-social (they have only eyes for their mate), they are forest dwelling and also one of the world’s rarest penguins. New Zealand has lost so much forest in recent times, which has been a predicament for these birds as they need forest shelter for protection and nesting habitat.

The wildlife company I guided for had come to a financial agreement with a local farmer to long term lease a part of the farm. They had spent the past 20 years replanting habitat and trapping and shooting predators that would kill this rare bird.

These penguins live in the same paddocks as the sheep. So when the penguins leave the water in the evening and are walking up the hill back to their nests, they routinely pass their sheep neighbours en route. It never ceases to make me laugh seeing an awkward tuxedo clad penguin jumping up a hill while a sheep watches nervously for the stab of a sharp beak. If you want to get that perfect Easter shot forget about bunnies and chicks, penguins and sheep is where it’s at.

Yellow eyed penguin with begging chick behind-Shaun Templeton
Yellow eyed penguin with begging chick behind-Shaun Templeton

The university students provided a whole other form of wildlife and regular entertainment for all us blow ins. One of the great misconceptions is that New Zealand has decent weather and summer clothes are the norm. North of Auckland this is true, but Dunedin has a very cold climate at times due to the Sub Antarctic influence and the bracing winds that scream through the city intermittently. More confusing is when you see students walking around in this bone chilling weather in their summer attire.
The reason behind this supposedly crazy behaviour has a touch of (possibly misguided) pragmatism to it. Dunedin was settled by predominantly puritanical, tough Scots in the mid 1800s. They burnt and felled large tracts of forest on their arrival, converting much of it into pasture land. They also brought over their own cattle, pets and imported possums from Australia to start a fur trade.

Yellow eyed penguin and sheep-Shaun Templeton
Yellow eyed penguin and sheep-Shaun Templeton

They built basic houses from the wood they felled. Despite the fact that over 100 years have passed, many of these houses have not been improved upon. Most student dwellings have no insulation, double glazing or central heating. The houses get so cold in winter that it is not unusual to wake with a layer of ice on the inner window frame and an ice cream headache to boot. In order to cope with the harsh living conditions, the students try to ”harden up” their bodies to deal with their digs.

Dunedin peninsula beach at sunset-Shaun Templeton
Dunedin peninsula beach at sunset-Shaun Templeton

A long established tradition and rite of passage for the first year or “Fresher” students involves couch burning. They raid skips for abandoned couches or buy them cheaply from charity shops. The fire brigade is kept very well occupied the first week of university when the students light these couches en masse in their front gardens.

It is these things, and the many more weird, wild and wonderful aspects to living in New Zealand which have made me fall so hopelessly in love with the country.

Yellow eyed penguin heading home-Shaun Templeton
Yellow eyed penguin heading home-Shaun Templeton

Source: Irish Times