The oceanic dispersal of plants and animals has been the focus of studies ever since organized natural history started in the Pacific, and the dispersal of terrestrial by sea rafting has been given due consideration. The finding of drift materials such as glass floats, tree trunks and seeds, is a common occurrence on the shores of Pacific Islands, but in most
cases the origin of such material is unknown or at least equivocal. Thus while the principle of sea rafted dispersal is known and reported at length, there is a need to document those
The Gilbert Islands are a north-south chain of low coral islands, lying across the equator at about 172°-177° E longitude. The atolls, from north to south are Little Makin, Butaritari, Marakei, Abaiang, Tarawa, Maiana, Kuria, Aranuka, Abemama, Nonouti, Tabiteuea, Onotoa, Beru, Nikunau, Tamana, and Arorai. They are densely populated, and were under British Colonial Government until 1979, when they were granted independence, and now are the principal archipelago in the new republic of Kiribati.
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The study of dispersal processes of small mammals, and especially of rodents, has a wide range of applications and until recent years there were few publications discussing the
colonisation of 'oceanic' islands by small mammals (cf. Crowell, 1986; Diamond, 1987; Hanski, 1986;Heany, 1986; Lomolino, 1986).
Several large regions of the world are plagued by
conservation problems shaped around a particular inherent
set of geographical, biological and human conditions which
have been operational for varying periods of time. Typical
of situations facing Latin America are the progress of
economic development in Amazonia with its attendant loss of
rainforest biodiversity, and the Central American
"hamburger connection" involving conversion of forests to
grazing land to support the export of cheap beef to the
In a typical High Island coral reef complex of French Polynesia (transect of Tiahura, Hoorea Island, Society Archipelago!, 73 species of decapod Reptantia and stomatopod crustaceans were collected. Over 9 stations localised along the transect, 3 different units of hard coral substrate of simi1ar volume (about 17 litres each), were sampled at each station. The results are discussed from two aspects : the first shows that at least 50 carcinologic species occur within the cavitary biotopes ; 16 species (mainly Xanthid crabs), represent more than 90% of all collected individuals.
Kwajalein is a crescent-shaped atoll that lies between 09°25' and 08°40'N and between 166°50' and 167°45'E, near the center o£ the western (Ralik) chain of the Marshall Islands (Figure 1). Composed of more than 90 islets, largely uninhabited, Kwajalein Atoll extends about 75 miles from southeast to northwest. It has a land area of about 6 square miles (3,854 acres) (Global Associates 1987), an increase of about 263 acres over the original area that was brought about by filling of land on Kwajalein, Roi-Namur, and Meek Islands.
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During the period 1958-1964, the authors undertook soil and vegetation studies in the northern Marshall Islands as part of the University of Washington Radiation Biology Laboratory surveillance team. This team was responsible for monitoring levels of radiation in various components of the island environment and any effects on plant and animal life. The authors of this report were charged with the soils and vegetation components but assisted with collections in the aquatic ecosystems and some food plant materials.
This monograph sheds light on the status of secondary plant cover, heretofore little known, on slopes between sea level and about 750m in the Marquesas Islands, a remote tropical Polynesian archipelago of high islands of volcanic origin situated in the dry tradewind zone of the South Pacific. Plant cover types are described and assigned to xerotropical, transitional and pluviotropical floristic zones determined in part by comparison with similar zones previously devised for Oahu Island, Hawaii.
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Agroforestry, the planting and protection of trees and tree like plants as integral components of a polycultural agricultural system, has always been central to the
Fruit bats of the genus Pteropus are considered to be strong fliers (Kingdon, 1974; Nowak and Paradiso, 1983), with some species commuting distances of 10-50 km between day roosts and feeding areas (Breadon, 1932; Ferrar, 1934; Hall, 1983; Lim,
1966; McWilliam, 1985-1986; Ratcliffe, 1932; Taylor, 1934; Walton and Trowbridge, 1983). Longer seasonal movements of > 100 km are known for several species of Australian Pteropus, which change roosting sites in response to shifting patterns in the
This paper describes the channels known as hoa which are characteristic of atoll land rims and of some islands on barrier reefs, where they often dissect previously more continuous reef-top sediment accumulations and conglomerate platforms. They are
This report includes an introductory section on the geography and vegetation, and a main portion listing the species of vascular plants known to occur, or to have occurred, on the island, with detailed descriptions of those of which time permitted a careful study, and brief descriptions of the remaining native species. Those suspected to have been brought by Polynesians in pre-European time are also described and discussed in some detail.
The Republic of the Marshall Islands requested a natural and cultural biodiversity survey of 6 northern atolls (Bok-ak, Pikaar, Toke, Wotto, Rondik, Adkup) and one reef island (Jemo) which was accomplished over 17 days in September 1988. This report covers the results of the survey of the reefs and corals during the expedition. Ninety-five marine sites were snorkeled and the shorelines of all island were surveyed during the
Coral atolls are natural laboratories within which to examine ecological processes (Sachet, 1967; Lee, 1984). They are often isolated, in some cases little disturbed, and have a geologically recent history of terrestrial plant colonisation. Reef islands around the rim of most atolls are Holocene in age. They are composed of biogenic skeletal sediments and have developed since reef growth caught up with sea level which stabilized after post-glacial sea-level rise. Plant colonisation of most of these islands must have occurred over a period of no more than 6000 years.
Interpretation of SEASAT geoid anomaly data and improved seafloor mapping of the
south-central Pacific suggest a complex tectonic history for the islands of the Pitcairn
group. While Oeno atoll formed at ~ 16m.y.BP at a 'hotspot' now south of the Easter micro-
plate, subsequent progressive island development at Henderson (13m.y.), Ducie (8m.y.)
and Crough seamount (4m.y.) resulted from the lateral leakage of magma from the Oeno
lineation along an old fracture zone, itself originating during the Tertiary reorientation
Ten caves in the makatea limestone of Mangaia, Cook Islands were explored and mapped, totalling over 3.7 km of passage. Of these, there was an apparent grouping by elevation that corresponds with previously described sea-level terraces in the makatea. Four caves have major level sections 10-20 m above sea-level, corresponding with a 14.5 m Pleistocene terrace. The high dimensions of these caves indicate downcutting during
Field work conducted by the senior author at Bikini
Atoll, Marshall Islands, in May 1986 yielded twenty-three
species of birds; six of these were documented as nesting
and an additional four species almost certainly nest as
well. Six species were previously unrecorded for Bikini
Atoll, and one of these, the Laughing Gull (Larus
atricilla) was new to Micronesia. The recorded avifauna
for Bikini Atoll now stands at twenty-six species. Major
seabird colonies were located on Aomoen (and other
The vertebrate fauna of Rotuma consists of over 425
fish species, no amphibians, 11 terrestrial reptiles, 15
land birds and two native mammals. The zoogeographic
affinity of the Rotuman fish fauna is with the Pacific
plate fauna; in contrast, the affinity of the reptile fauna
is with the Fijian fauna. A species list of Rotuman
occurrence is provided for each of the four vertebrate
groups as well as brief descriptions of the marine and
terrestrial habitats.
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This review was prepared on very short notice, to
provide a summary of what is known to the reviewer at the
time, June 1988, about the natural phenomena of the Marshall
Islands. This was for the use of the members of the survay
team sent to the Marshalls by the Environment and Policy
Institute of the East-West Center, Honolulu. Their mission
was to investigate the remaining relatively natural areas
and the extent of biodiversity in the new Republic of the
Marshall Islands.
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Nukutipipi atoll (5 km2), of volcanic origin 16-17 million years old on the Pitcairn (hot spot) Hereheretue line, presents a land flora and fauna of low diversity but with a Pisonia forest and hundreds of resident red-tailed tropic birds. Nukutipipi suffered from the 1983 hurricanes : destruction of vegetation and motu as well as sand lagoon mollusc populations. The north and south rims present original geomorphological structures.