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Figure 3 in Corals and reefs of Cosmoledo and Aldabra atolls: Extent of damage, assemblage shifts and recovery following the severe mortality of 1998
Figure 3. Visual estimates of coral cover at various depths on seaward slopes (diamonds) and lagoon patch reefs (open circles). The dotted curve indicates hypothetical or possible approximate maximum pre-bleaching coral cover with depth, based on maximum values found in patches here at shallow and intermediate depths. The solid curve is a third-order polynomial fit of the seaward reef cover values. Average seaward reef mortality is suggested by the gap between the two curves. The arrow marks the approximate transition depth.
Figure 2 in Corals and reefs of Cosmoledo and Aldabra atolls: Extent of damage, assemblage shifts and recovery following the severe mortality of 1998
Figure 2. (a) Seaward reef slope of West Cosmoledo. This is typical of shallow seaward slopes of south, through west to the north, showing very limited coral growth, but presence of algae. (b) Dead Millepora colonies in the lagoon are extensive, without sign of live growth and few new recruits. (c) Acropora palifera, showing recovery on shallow seaward slopes. It is growing on the side of a large dead colony of the same species. (d) Dead Acropora cytherea, eroded but still standing. Most examples in November 2002 were remnants of stumps. A new Acropora has since settled on the table. The yellow device is a newly installed temperature logger.
Figure 1 in Corals and reefs of Cosmoledo and Aldabra atolls: Extent of damage, assemblage shifts and recovery following the severe mortality of 1998
Figure 1. The Aldabra group of atolls, showing survey sites. Top left: location map, rectangle shows location of the four components of the Aldabra group; top right: World Vector Shoreline outline of the four groups; lower right: Cosmoledo Atoll (scanned image from map); lower left: Aldabra (from a Landsat MSS). On lower maps, dots indicate sample sites in lagoon and seaward sites, rectangles indicate sample sites in main channels. In Cosmoledo, lagoon sites are pooled. On seaward side of Cosmoledo, sites were West (Menai Island), North (North Island) and North-West (midway between the two). Seaward site in Aldabra was 300–500 m north of the field station (marked by ×). All sites in Cosmoledo lagoon had radii of at least 100 m, or, on seaward sites, along at least 200 m of reef between 0 and 30 m depth.
Data from: Persistence of distinctive morphotypes in the native range of the CITES-listed Aldabra giant tortoise
Understanding the extent of morphological variation in the wild population of Aldabra giant tortoises is important for conservation, as morphological variation in captive populations has been interpreted as evidence for lingering genes from extinct tortoise lineages. If true, this could impact reintroduction programmes in the region. The population of giant tortoises on Aldabra Atoll is subdivided and distributed around several islands. Although pronounced morphological variation was recorded in the late 1960s, it was thought to be a temporary phenomenon. Early researchers also raised concerns over the future of the population, which was perceived to have exceeded its carrying capacity. We analyzed monthly monitoring data from 12 transects spanning a recent 15-year period (1998–2012) during which animals from four subpopulations were counted, measured, and sexed. In addition, we analyzed survival data from individuals first tagged during the early 1970s. The population is stable with no sign of significant decline. Subpopulations differ in density, but these differences are mostly due to differences in the prevailing vegetation type. However, subpopulations differ greatly in both the size of animals and the degree of sexual dimorphism. Comparisons with historical data reveal that phenotypic differences among the subpopulations of tortoises on Aldabra have been apparent for the last 50 years with no sign of diminishing. We conclude that the giant tortoise population on Aldabra is subject to varying ecological selection pressures, giving rise to stable morphotypes in discrete subpopulations. We suggest therefore that (1) the presence of morphological differences among captive Aldabra tortoises does not alone provide convincing evidence of genes from other extinct species; and (2) Aldabra serves as an important example of how conservation and management in situ can add to the scientific value of populations and perhaps enable them to better adapt to future ecological pressures.
Data from: In the land of giants: habitat use and selection of the Aldabra giant tortoise on Aldabra Atoll
With habitat loss and fragmentation among the greatest threats to biodiversity, a better understanding of the habitat use of keystone species is critical in any conservation management strategy. Aldabra Atoll, in the Seychelles archipelago, has the largest population worldwide of giant tortoises. This endemic species (Aldabrachelys gigantea) could be vulnerable to habitat fragmentation and loss induced by climate change related reduction in rainfall. Here, we assess habitat use and selection by A. gigantea in its natural environment on Aldabra. We quantified the habitat areas of A. gigantea based on the first high-resolution terrestrial habitat map of Aldabra, produced for this purpose using satellite imagery. The resulting map was combined with four years of movement data to assess A. gigantea habitat use and selection at landscape and home range scales. Grassland or 'tortoise turf' habitat was most preferred by A. gigantea on Aldabra, at the landscape scale across seasons, followed by open mixed scrub. These two habitats cover only 30 km2 (19.2%) of the surface of the atoll (total area: 155.5 km2). At the home range scale, there was no significant preference shown and habitat was used randomly. Our results suggest that Aldabra's grassland habitat, despite its small area, is of great importance to A. gigantea. Conservation management actions for A. gigantea on Aldabra and elsewhere should therefore focus on the protection and maintenance of this habitat.
Data from: Patterns of activity and body temperature of Aldabra giant tortoises in relation to environmental temperature
We studied the temperature relations of wild and zoo Aldabra giant tortoises (Aldabrachelys gigantea) focusing on: 1) the relationship between environmental temperature and tortoise activity patterns (n=8 wild individuals), and 2) on tortoise body temperature fluctuations, including how their core and external body temperatures vary in relation to different environmental temperature ranges (seasons; n=4 wild, and n=5 zoo individuals). In addition, we surveyed the literature to review the effect of body mass on core body temperature range in relation to environmental temperature in the Testudinidae. Diurnal activity of tortoises was bimodally distributed, and influenced by environmental temperature and season. The mean air temperature at which activity is maximised was 27.9˚C, with a range of 25.8–31.7˚C. Furthermore, air temperature predicted changes in the core body temperature better than did mass, and only during the coldest trial did tortoises with higher mass show more stable temperatures. Our results, together with the overall Testudinidae overview, suggest that, once variation in environmental temperature has been taken into account, there is little effect of mass on the temperature stability of tortoises. Moreover, the presence of thermal inertia in an individual tortoise depends on the environmental temperatures, and we found no evidence for inertial homeothermy. Finally, patterns of core and external body temperatures in comparison to environmental temperatures suggest that Aldabra giant tortoises act as mixed conformer-regulators. Our study provides a baseline to manage the thermal environment of wild and rewilded populations of an important island ecosystem engineer species in an era of climate change.
On following pages: 177. Bonin Flying Fox (Pteropus pselaphon); 178. Little Golden-mantled Flying Fox (Pteropus pumilus); 179. Lyle's Flying Fox (Pteropus lylei); 180. Indian Flying Fox (Pteropus medius); 181. Rodrigues Flying Fox (Pteropus rodricensis); 182. Large Flying Fox (Pteropus vampyrus); 183. Aldabra Flying Fox (Pteropus aldabrensis); 184. Malagasy Flying Fox (Pteropus rufus); 185. Seychelles Flying Fox (Pteropus seychellensis); 186. Greater Mascarene Flying Fox (Pteropus nigen; 187. Aru Flying Fox (Pteropus aruensis); 188. Kai Flying Fox (Pteropus keyensis); 189. Black-bearded Flying Fox (Pteropus melanopogon); 190. South Moluccan Flying Fox (Pteropus chrysoproctus); 191. North Moluccan Flying Fox (Pteropus caniceps). in Pteropodidae
On following pages: 177. Bonin Flying Fox (Pteropus pselaphon); 178. Little Golden-mantled Flying Fox (Pteropus pumilus); 179. Lyle's Flying Fox (Pteropus lylei); 180. Indian Flying Fox (Pteropus medius); 181. Rodrigues Flying Fox (Pteropus rodricensis); 182. Large Flying Fox (Pteropus vampyrus); 183. Aldabra Flying Fox (Pteropus aldabrensis); 184. Malagasy Flying Fox (Pteropus rufus); 185. Seychelles Flying Fox (Pteropus seychellensis); 186. Greater Mascarene Flying Fox (Pteropus nigen; 187. Aru Flying Fox (Pteropus aruensis); 188. Kai Flying Fox (Pteropus keyensis); 189. Black-bearded Flying Fox (Pteropus melanopogon); 190. South Moluccan Flying Fox (Pteropus chrysoproctus); 191. North Moluccan Flying Fox (Pteropus caniceps).
Figure 5 in A new species of Neocirolana Hale, 1925 (Crustacea: Isopoda: Cirolanidae) collected during the Royal Society Expedition to Aldabra 1967-69, western Indian Ocean
Figure 5. Neocirolana taylori sp. nov. paratype male, 6.2 mm, NHM UK 2018.1275, Picard Island, Aldabra Atoll, Seychelles. a, uropod; b–f, pleopods 5–1 respectively.
Figure 4 in A new species of Neocirolana Hale, 1925 (Crustacea: Isopoda: Cirolanidae) collected during the Royal Society Expedition to Aldabra 1967-69, western Indian Ocean
Figure 4. Neocirolana taylori sp. nov. paratype male, 6.2 mm, NHM UK 2018.1275, Picard Island, Aldabra Atoll, Seychelles. a–c, pereopods 1, 2 and 7 respectively.
Figure 3 in A new species of Neocirolana Hale, 1925 (Crustacea: Isopoda: Cirolanidae) collected during the Royal Society Expedition to Aldabra 1967-69, western Indian Ocean
Figure 3. Neocirolana taylori sp. nov. paratype male, 6.2 mm, NHM UK 2018.1275, Picard Island, Aldabra Atoll, Seychelles. a, right mandible; b, left mandible; c, maxilliped; d, maxillula; e, maxilla.
Figure 2 in A new species of Neocirolana Hale, 1925 (Crustacea: Isopoda: Cirolanidae) collected during the Royal Society Expedition to Aldabra 1967-69, western Indian Ocean
Figure 2. Neocirolana taylori sp. nov. habitus, holotype, male, 7.5 mm, NHM UK 2018.1273; Antennaeparatype male, 6.2 mm, NHM UK 2018.1275, Picard Island, Aldabra Atoll, Seychelles. (a) dorsal view, cephalon and anterior pereonites; (b) dorsal view; (c) lateral view; (d) dorsal view, cephalon; (e) frons; (f) antenna; (g) antennula.
Figure 1 in A new species of Neocirolana Hale, 1925 (Crustacea: Isopoda: Cirolanidae) collected during the Royal Society Expedition to Aldabra 1967-69, western Indian Ocean
Figure 1. Neocirolana taylori sp. nov. habitus, paratype, non-ovig. female, 7.8 mm, NHM UK 2018.1271. Scale mm.
Data from: In the land of giants: habitat use and selection of the Aldabra giant tortoise on Aldabra Atoll
Open the record for dataset details and reuse information.
Data from: Persistence of distinctive morphotypes in the native range of the CITES-listed Aldabra giant tortoise
Open the record for dataset details and reuse information.
Data from: Patterns of activity and body temperature of Aldabra giant tortoises in relation to environmental temperature
Open the record for dataset details and reuse information.
FIGURE. 7. Plinachtus aldabrensis n in Two new species of Plinachtus Stål (Hemiptera: Heteroptera: Coreidae: Coreinae: Gonocerini) from Aldabra Atoll and Madagascar
FIGURE. 7. Plinachtus aldabrensis n. sp. Male, habitus.
FIG. 3 in A new species of Triaenops (Mammalia, Chiroptera, Hipposideridae) from Aldabra Atoll, Picard Island (Seychelles)
FIG. 3. — Dorsal (A, B), ventral (C, D), and lateral (E, F) views of adult crania and mandibles of Triaenops Dobson, 1871: A, C, E, T. furculus Trouessart, 1906, FMNH 172893 (greatest skull length 17.3 mm) from near Sarodrano, the type locality of this species; B, D, F, holotype of T. pauliani n. sp., BMNH 13.2.18.1 (greatest skull length 17.1 mm) taken on Picard Island, Aldabra Atoll. Photos: John Weinstein (FMNH image No. Z94447_10d).
FIG. 1 in A new species of Triaenops (Mammalia, Chiroptera, Hipposideridae) from Aldabra Atoll, Picard Island (Seychelles)
FIG. 1. — Map of the islands of the western Seychelles Archipelago (Aldabra, Cosmoledo, and Assumption), Madagascar, and the east African coast showing the distribution of the different Triaenops species occurring across the western Indian Ocean. ○, T. auritus G. Grandidier, 1912; △, T. furculus Trouessart, 1906; + +, T. rufus A. Milne-Edwards, 1881; □, T. pauliani n. sp. Note that Aldabra is to the northwest of the northern tip of Madagascar and these two zones form an almost equidistant triangle with the Comoro Islands.
Distribution. Seychelles Is (Aldabra Atoll). in Pteropodidae
Distribution. Seychelles Is (Aldabra Atoll).
Distribution. Known only from Picard Aldabra Atoll, Western Seychelles. in Rhinonycteridae
Distribution. Known only from Picard Aldabra Atoll, Western Seychelles.
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