Plants '', SW Pacific washed up on Blinky Beach Lord Howe Island is a distinct terrestrial
ecoregion known as the Lord Howe Island
subtropical forests. It is part of the
Australasian realm and shares many biotic affinities with Australia,
New Guinea, and
New Caledonia. In geological terms at 7 million years old, Lord Howe Island is relatively young and was never part of any continent, its flora and fauna colonising the island from across the sea, carried by the wind, water, or birds, possibly assisted at a geological time when other islands were exposed, enabling
island hopping. Nevertheless, it has been sufficiently remote for long enough to evolve
endemic species. '') The high degree of endemism is emphasised by the presence of five endemic genera:
Negria,
Lordhowea,
Howea,
Lepidorrhachis, and
Hedyscepe. Island plants are similar to those of Norfolk Island, the two islands sharing some endemic species, for example, the critically endangered species of creeping vine
Calystegia affinis. The combined flora of these two islands is more closely related to
that of New Zealand and
New Caledonia than to that of Australia. One of the best-known plant genera endemic to Lord Howe Island is
Howea, an endemic
genus of palms (
Arecaceae) that are commonly known as
kentia palms and are popular houseplants. Mosses include
Spiridens muelleri. There are 57 species of
ferns, of which 25 are endemic: they are most abundant in the moist environments of the southern island, especially the higher parts of Mount Gower, perhaps the most apparent being the four endemic tree ferns in the genus
Cyathea that occur on the southern mountains.
Hedyscepe and
Lepidorrhachis are the other two palm genera that are also endemic to the island. Since the rodent eradication program, researchers have observed an increase in the amount of growth and seeds, especially of the "larger, fleshy, fruited plants", previously eaten by rats. As the
understorey grows thicker, this in turn will provide habitat for small animals such as snails and insects, which in turn provide food for the birds. Pandanus tree (
Pandanus forsteri) has spectacular teepee-like prop roots and pineapple-like fruits that are orange-red when mature, the tough leaves being used for basketry. It occurs in damp areas such as creek beds, and fine specimens can be seen along the Boat Harbour track. The palms are the signature plants of the island as the kentia and curly palms especially dominate the landscape in many places, the kentia being of special economic importance. All four species are endemic to the island, often occurring in dense, pure stands, the one that has proved such a worldwide success as an indoor plant being the kentia or thatch palm (
Howea forsteriana). This is a lowland palm with drooping leaflets and seed branches in 'hands' of three to five, while the curly palm (
H. belmoreana), which occurs on slightly higher ground, has upwardly directed leaflets and solitary 'hands'. Natural hybrids between these species occur on the island and a mature specimen of one is growing in the island nursery. On the mountain sides higher than about 350 m, the big mountain palm (
Hedyscepe canterburyana) occurs; it has large, golf ball-sized fruits, while the little mountain palm (
Lepidorrhachis mooreana) has marble-sized fruits and is only found on the mountain summits.
Images of native flora Animals No snakes nor poisonous or venomous animals or plants occur, and no dangerous daytime sharks are found off the beaches, although tiger sharks have been reported on the cliff side of the island.
Birds A total of 202 different birds have been recorded on the island. Eighteen species of land birds breed on the island and many more
migratory species occur on the island and its adjacent islets, many tame enough that humans can get quite close. The island has been identified by
BirdLife International as an
endemic bird area, and the Permanent Park Preserve as an
important bird area because it supports the entire population of
Lord Howe woodhens, most of the breeding population of
providence petrels, over 1% of the world population of another five seabird species, and the whole populations of three endemic subspecies. Fourteen species of
seabirds breed on the island. The iconic endemic rail, the flightless
Lord Howe woodhen, is the only surviving member of its genus; its ancestors could fly, but with no predators and plenty of food on the island, this ability was lost. This made it easy prey for islanders and feral animals, so by the 1970s, the population was less than 30 birds. From 1978 to 1984, feral animals were removed and birds were raised in captivity to be successfully reintroduced to the wild. The population is now relatively safe and stable.
Domestic Mallards have colonised Lord Howe Island from New Zealand. They have replaced the
Pacific Black Duck through competition and
introgressive hybridisation.
List of endemic birds (Zosterops lateralis tephropleurus) •
Lord Howe currawong,
Strepera graculina crissalis (vulnerable, subspecies of pied currawong) •
Lord Howe golden whistler,
Pachycephala pectoralis contempta (least concern, subspecies of golden whistler) •
Lord Howe silvereye,
Zosterops lateralis tephropleurus (vulnerable, subspecies of silvereye) •
Robust white-eye,
Zosterops strenuus (extinct) •
Lord Howe gerygone,
Gerygone insularis (extinct) •
Lord Howe fantail,
Rhiphidura fuliginosa cervina (extinct, subspecies of NZ fantail) •
Lord Howe starling,
Aplonis fusca hulliana (extinct, subspecies of extinct Tasman starling) •
Lord Howe thrush,
Turdus poliocephalus vinitinctus (extinct, subspecies of Island thrush) •
Lord Howe parakeet,
Cyanoramphus subflavescens (extinct) •
Lord Howe boobook,
Ninox novaeseelandiae albaria (extinct) •
Lord Howe woodhen,
Hypotaenidia sylvestris (endangered) •
Lord Howe swamphen,
Porphyrio albus (extinct) •
Lord Howe pigeon,
Columba vitiensis godmanae (extinct)
Mammals, reptiles and amphibians '', once native to Lorde Howe Only one native
mammal remains on the islands, the
large forest bat. The endemic
Lord Howe long-eared bat is known only from a skull and is now presumed extinct, possibly the result of the introduction of
ship rats. Two terrestrial reptiles are native to the island group: the
Lord Howe Island skink and the
Lord Howe Island gecko. Both are rare on the main island, but more common on smaller islands offshore. The
garden skink and the
bleating tree frog have been accidentally introduced from the Australian mainland. During the
Pleistocene the giant terrestrial horned
turtle Meiolania platyceps was endemic to the island, but this is currently thought to have gone extinct before human occupation as a result of postglacial sea-level rise.
Invertebrates The
Lord Howe stick insect disappeared from the main island soon after the accidental introduction of rats when the SS
Makambo ran aground near Ned's Beach on 15 June 1918. In 2001, a tiny population was discovered in a single
Melaleuca howeana shrub on the slopes of Ball's Pyramid, has been successfully bred in captivity, and is nearing re-introduction to the main island. The
Lord Howe stag beetle is a colourful endemic beetle seen during summers. Another endemic invertebrate, the
Lord Howe flax snail (or Lord Howe
Placostylus), has also been affected by the introduction of rats. The Lord Howe Island wood-feeding cockroach (
Panesthia lata) was thought extirpated from the island until a small population was found.
Marine life swimming in the waters of Ned's Beach Marine environments are near-pristine with a mixture of temperate, subtropical, and tropical species derived from cool-temperate ocean currents in the winter and the warm
East Australian Current, which flows from the
Great Barrier Reef, in summer. Of the 490 fish species recorded, 13 are endemic and 60% are tropical. Australian underwater photographer
Neville Coleman has photographed various
nudibranchs at Lord Howe Island. Various species of
cetaceans inhabit or migrate through the waters in the vicinity, but very little about their biology in the area is known due to a lack of studies and sighting efforts caused by locational conditions.
Bottlenose dolphins are the most commonly observed and are the only species confirmed to be seasonal or yearly residents, while some other
dolphin species have also been observed.
Humpback whales are the only large whales showing slow but steady recoveries as their numbers annually migrating past the island of Lord Howe are much smaller than those migrating along the Australian continent. Historically, migratory whales such as
blue,
fin, and
sei whales were very abundant in the island waters but were severely reduced in numbers to near-extinction by commercial and illegal hunts, including the mass illegal hunts by the Soviet Union and Japan in the 1960s to 1970s.
Southern right and
sperm whales were most severely hunted among these, hence the area was called the Middle Ground by whalers. These two were likely once seasonal residents around the island, where right whales prefer sheltered, very shallow bays, while sperm whales mainly inhabit deep waters.
Conservation '') painted by
George Raper, 1790 – now extinct About 10% of Lord Howe Island's forests have been cleared for agriculture, and another 20% has been disturbed, mostly by domestic cattle and feral sheep, goats, and pigs. As a result, 70% of the island remains relatively untouched, with a variety of plants and animals, many of which are endemic, and some of which are rare or threatened. Two species of plants, nine terrestrial birds, one bat, and at least four invertebrates have become extinct since 1778. Endemism at the
generic level includes the palms
Howea,
Hedyscepe and
Lepidorrhachis, a woody daisy
Lordhowea insularis, the tree
Negria, the leech
Quantenobdella howensis, three annelid worm genera (
Paraplutellus,
Pericryptodrilus and
Eastoniella), an
isopod shrimp
Stigmops, a
hemipteran bug
Howeria, and a cricket
Howeta. The Lord Howe Island Board instigated an extensive biological and
environmental survey (published in 1974), which has guided the island conservation program. A group of scientists including director of the
Australian Museum,
Frank Talbot, and others from the
Royal Botanic Gardens, the
National Parks and Wildlife Service, and the
CSIRO undertook an environmental survey of the island in 1970, reporting on environmental degradation there. In 1981, the Lord Howe Island Amendment Act proclaimed a "Permanent Park Preserve" over the north and south ends of the island. Administration of the preserve was outlined in a management plan for the sustainable development of the island prepared by the NSW
National Parks and Wildlife Service, which has a ranger stationed on the island. The island was cited under the UNESCO World Heritage List in 1982. Offshore environmental assets are protected by the
Lord Howe Island Marine Park. This consists of a state marine park managed by the Marine Parks Authority of New South Wales in the waters out to three nautical miles around the island and including Ball's Pyramid. It also includes a
Commonwealth Marine Park extending from 3 to 12 nautical miles out and managed by the federal
Department of the Environment and Heritage. In total the Marine Park covers about .
Feral animals and plants Pigs and goats were released on the island as potential food sources in the early 1800s; the goats destroyed shrubs and grasses used as nesting sites and the pigs ate eggs and chicks and disturbed the land by rooting for food. Several birds have become extinct on the island since the arrival of humans. The first round of extinctions included the
Lord Howe swamphen or white gallinule, the
white-throated pigeon, the
red-crowned parakeet, and the
Tasman booby, which were eliminated by visitors and settlers during the 19th century, either from overhunting for food or protection of crops. Invasive plants such as
Crofton weed and
Formosa lily occur in inaccessible areas and probably cannot be eradicated, but others are currently being managed. In 1995, the first action was taken to control the spread of introduced plants on the island, chiefly
ground asparagus and
bridal creeper, but also
cherry guava,
Madeira vine,
Cotoneaster,
Ochna, and
Cestrum. This has been followed by weeding tours and the formation of the Friends of Lord Howe Island group in 2000. Programs have also been started to remove weeds from private properties and re-vegetate some formerly cultivated areas. An environmental unit was created by the board and it includes a flora management officer and a permanent weed officer. Weeds have been mapped and an eradication program is in place, supported by improved education and quarantine procedures. Introduced species that harmed Lord Howe's native flora and fauna, namely feral pigs, cats, and goats, were eradicated by the early 2000s. In July 2012, the Australian federal Environment Minister
Tony Burke and the New South Wales Environment Minister
Robyn Parker announced that the Australian and New South Wales governments would each contribute 50% of the estimated A$9 million cost of implementing a rodent eradication plan for the island, using the aerial deployment of poison baits. The plan was put to a local vote and is considered controversial. Around 230 woodhens were captured before the rodent eradication commenced in early 2019. Following the successful eradication of the rodents, all woodhens and currawongs were released across the island in late 2019 and early 2020. In 2023 the island was declared rodent free, which is a globally significant conservation milestone. A recovery program has restored the
Lord Howe woodhen's numbers from only 20 in 1970 to about 250 birds four years before the rodent baiting program. There were 1,100 in the 2023 survey.
Climate change According to an analysis by eminent Australian academic
Tim Flannery, the ecosystem of Lord Howe Island is threatened by
climate change and
global warming, with the reefs at risk from rises in water temperature. The first international conference on global
artificial photosynthesis as a climate-change solution occurred at Lord Howe Island in 2011, the papers being published by the
Australian Journal of Chemistry. == Heritage listings ==