Lakeba

Copra production is the most important economic activity on Lakeba. There is also a coconut mill four kilometers outside Tubou. Tourism is of lesser importance in Lakeba than in some other parts of Fiji.

Among land birds, bird species disappeared from Lakeba in prehistoric times, probably after the upland forests were largely cleared away; introduced rats as well as hunting probably also contributed to their demise. Others managed to adapt to the alteration of habitat by humans, though they are generally not as common as on Aiwa where there has been no significant deforestation. For the most part, the avifauna of Lakeba is more similar to that of Samoa and Tonga than to that of the main group of Fiji. Quite commonly seen are the white-rumped swiftlet (Collocalia spodiopygia), Polynesian starling, (Aplonis tabuensis, either the West Fijian subspecies vitiensis or the subspecies tabuensis from the southern Lau group and Tonga), Vanikoro flycatcher (Myiagra vanikorensis), and the slaty monarch (Mayrornis lessoni) which is endemic to Fiji. Two honeyeaters, the endemic orange-breasted myzomela (Myzomela jugularis) and the widespread eastern wattled honeyeater (Foulehaio carunculatus carunculatus), have adapted well to human settlement and are rather common in the coconut plantations. The collared lory (Phigys solitarius), endemic to Fiji in modern times, also frequents this habitat, but is a rather rare species on Lakeba.[2]

At least three species formerly found on Lakeba are now completely extinct: the Lakeba imperial pigeon (Ducula lakeba) might also have occurred on Viti Levu and perhaps on the Tongan islands of ʻEua, Foa and Lifuka. If so, it probably was generally widespread in western Polynesia, but until now it is only known with certainty from Lakeba and Aiwa. A hitherto undescribed Gallirallus rail also inhabited Lakeba and Aiwa in the past; as this bird was flightless it represents an endemic species. The consumed scrubfowl (Megapodius alimentum), a species rather widely distributed throughout Fiji and Tonga, also occurred on Lakeba and Aiwa in the past; as scrubfowl were widely transported across islands by settlers, this species might have been brought here by humans, but altogether this is not too likely.[2]

However, on Aiwa a single bone was found, probably referrable either to the Viti Levu scrubfowl (M. amissus) or the pile-builder megapode (M. molistructor); the latter species occurred on Tonga and New Caledonia, while the former, which lived on Viti Levu and perhaps Kadavu of the western group of Fiji, possibly survived to modern times. Considering that only one bone was found and that M. alimentum was numerous on Lakeba and presumably also Aiwa, it may well be that the second Megapodius species was indeed imported as food by Polynesians and never had a self-sustaining population; in that regard it may be noted that unlike M. alimentum, M. amissus was a weak flier or even flightless. Parrot bones found on Lakeba might be of the Oceanic eclectus parrot (Eclectus infectus); biogeography suggests that this species was formerly native to at least some islands in Fiji, as it occurred on Tonga to the east and Vanuatu to the west. In addition, there remains a batch of songbird bones from several species that have not been identified; these might be of birds not found on Lakeba anymore but it is not too likely that they contain any entirely extinct forms.[2]

Also found on Aiwa was a single bone of a Porzana rail. Apparently this was yet another distinct species, and if so it is likely to have occurred on Lakeba too. But until more material turns up and is studied, nothing can be said with certainty, particularly in respect of the fact that the white-browed crake (P. cinerea) and the spotless crake (P. tabuensis) formerly occurred on Lakeba. Finally, a single bone of the striated heron (Butorides striata) was found on Lakeba; the species does not occur there today, but unless more bones are found it is not sure that it had a self-sustaining population on this island rather than being merely an occasional visitor. Peale's imperial pigeon (Ducula latrans), the Southwest Pacific peregrine falcon (Falco peregrinus nesiotes) and the Fiji shrikebill (Clytorhynchus vitiensis) breed on much smaller Aiwa but not on Lakeba; though no bones of these species have been found here to date, it is likely that they formerly occurred on Lakeba too.[2]

The small tree Grewia crenata can be found in Lakeba's forests

Miscanthus floridulus, a native grass of Lakeba, forms thickets in the talasiga

Vigna marina, a native legume of Lakeba that grows abundantly near the sea

The former upland forest was largely cleared after the initial settlement to make room for agriculture; only about 5 km² (1.9 sq mi) of it remain. A total 40% of Lakeba's surface is used for cultivation of Caribbean pine (Pinus caribaea), the rare cycad ("sago palm") Cycas seemannii, coconut palms (Cocos nucifera) and other crops. The remaining vegetation of Lakeba is dominated by dicots; it can be classified as follows, progressing from the peak to the shore:[4]

• Upland forest on volcanic soil. Little remains today, mostly in ravines and on ridges. Contains such species as Alyxia stellata, Alphitonia zizyphoides, Barringtonia edulis, Dysoxylum richii, Ficus scabra, Grewia crenata, Micromelum minutum, Pittosporum arborescens, Vavaea amicorum, and Geissois ternata which is only found on volcanic soils.
• talasiga grassland and scrub. This is a plant community that contains mainly herbaceous and small woody species; it grows where forest had been cleared away in the past. In locations that have suffered much erosion it persists; elsewhere it is gradually being replaced with forest again. Dominant plant species are Dicranopteris linearis, Hopseed (Dodonaea viscosa), Pandanus tectorius and Pteridium esculentum; grasses include Bothriochloa bladhii, Brachiaria subquadripara, Southern Sandbur (Cenchrus echinatus), Indian Goosegrass (Eleusine indica), Eragrostis scabriflora, Eriochloa procera, Imperata conferta, Miscanthus floridulus, Paspalum conjugatum, P. orbiculare, Pennisetum polystachion and Themeda quadrivalvis. Regenerating forest is initially dominated by Cyclophyllum barbatum, Geissois ternata, Geniostoma rupestre, Leucosyke corymbulosa, Maesa tabacifolia and Myristica gillespieana.
• Upland forest on calcitic soil. This is essentially secondary forest in various stages of succession, but rich in Fijian endemics. Dominated by Alphitonia zizyphoides, Buchanania vitiensis, Dysoxylum richii, D. tenuiflorum, Maniltoa floribunda, Melicope cucullata and Planchonella tahitensis.
• Wetlands vegetation. Most freshwater wetland on Lakeba is used for taro cultivation. Otherwise, dominant plants include Ludwigia octovalvis and Mikania micrantha.
• Lowland swamp forest. Dominated by Inocarpus fagifer.
• Coastal forest. Characterized by Diospyros elliptica, D. samoensis, Planchonella tahitensis, Syzygium richii and Xylosma simulans.
• Mangrove forest. Mangroves are widespread on the eastern coast of Lakeba, comprising about 7% of the island's total area. Dominant plant species are black mangrove (Bruguiera gymnorhiza) landwards, and red mangrove (Rhizophora mangle), spotted mangrove (R. stylosa) and their sterile hybrid R. × selala seawards.
• Littoral forest. These trees are able to withstand seawater and most are even dispersed by the sea; they grow in a narrow strip along the beach. Dominant plants are sea poison tree (Barringtonia asiatica), ballnut (Calophyllum inophyllum), Hernandia nymphaeifolia, beach hibiscus (Hibiscus tiliaceus), Phaleria disperma and sea almond (Terminalia catappa).
• Littoral scrub. The low-lying and mainly herbaceous beach vegetation. Dominated by oceanblue morning glory (Ipomoea indica), white-flowered beach morning glory (I. littoralis), beach morning glory (I. pes-caprae), Pandanus tectorius, Paspalum vaginatum, Scaevola taccada and Vigna marina.

Plants found on Lakeba that are endemic to Fiji are Alangium vitiense, Buchanania vitiensis, Connarus pickeringii, Davallia solida var. fejeensis, Diospyros vitiensis var. longisepala, Dysoxylum tenuiflorum, Elatostema tenellum, Eragrostis scabriflora, Ficus fulvo-pilosa, Ficus masonii, Geissois ternata, Geniostoma uninervium, Glochidion seemannii, Homalium pallidum, Maniltoa floribunda, Melicope cucullata, Melochia vitiensis, Myristica gillespieana, Phaleria pubiflora, Polyalthia laddiana and Psychotria cf. pickeringii. Plants tentatively identified as the Fijian endemics Barringtonia seaturae, Citronella vitiensis, Cyathocalyx insularis and Elaeocarpus storckii grow on Lakeba, but whether it is really these species requires confirmation.[4]

None of the described endemic species occurs exclusively on this island, but there is an unidentified Syzygium similar to Syzygium gracilipes and another member of this genus that almost certainly is a hitherto unknown species. These might indeed be found on Lakeba only.[4]

Interesting non-endemic plants found on Lakeba are the endangered Aglaia saltatorum and the rare (though not endangered) Burckella richii. In 1999-2001 the first Fijian record of Macropiper timothianum outside the large northwestern islands was made on Lakeba, as well as the first records for Fiji of Suicide Tree (Cerbera odollam) and Garuga floribunda. Whether Canarium vanikoroense, otherwise known in Fiji only from the large islands, occurs on Lakeba remains to be verified.[4]