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918 results for “oceanic islands”
FIG. 13 in The fern genera Dryopteris and Nothoperanema (Dryopteridaceae) in Madagascar and neighbouring Indian Ocean islands, including Saint Paul
FIG. 13. — Distribution of Dryopteris bojeri (Baker) Kuntze in Mauritius.
FIG. 11 in The fern genera Dryopteris and Nothoperanema (Dryopteridaceae) in Madagascar and neighbouring Indian Ocean islands, including Saint Paul
FIG. 11. — Isosyntype of Dryopteris bojeri (Baker) Kuntze, Bojer s.n. (M0065885).
FIG. 10 in The fern genera Dryopteris and Nothoperanema (Dryopteridaceae) in Madagascar and neighbouring Indian Ocean islands, including Saint Paul
FIG. 10. — Distribution of Dryopteris bernieri Tardieu in la Réunion and Comoro Islands (•).
FIG. 8 in The fern genera Dryopteris and Nothoperanema (Dryopteridaceae) in Madagascar and neighbouring Indian Ocean islands, including Saint Paul
FIG. 8. — Specimen of Dryopteris bernieri Tardieu, Bewsher s.n. (K).
FIG. 7 in The fern genera Dryopteris and Nothoperanema (Dryopteridaceae) in Madagascar and neighbouring Indian Ocean islands, including Saint Paul
FIG. 7. — Distribution of Dryopteris aquilinoides (Desv.) C.Chr. in Mauritius and la Réunion.
Evolutionary history of inshore oceanic island land snails diversified in shell colour
<p><strong><span>Aim: </span></strong><span>Oceanic islands provide an excellent opportunity to study the mode and tempo of phenotypic evolution of terrestrial organisms. Many studies have focused on oceanic islands far from the mainland. Oceanic islands near the mainland may provide distinct perspectives on phenotypic evolution, but a comprehensive understanding is still lacking. To address this gap, this study aimed to reveal when a land snail species inhabiting a volcanic archipelago within 40 km of the mainland diverged and how their</span> <span>shell colours evolved.</span></p> <p><strong><span>Location:</span></strong><span> Southern Izu Peninsula and five Izu Islands (Oshima, Toshima, Niijima, Shikine, and Kozu), Japan.</span></p> <p><strong><span>Taxon:</span></strong><span> <em>Euhadra peliomphala simodae</em></span></p> <p><strong><span>Methods:</span></strong><span> Double-digest restricted-site associated DNA sequencing (ddRAD-seq) was conducted using 117 individual snails. Molecular phylogenetic and population genomic analyses were performed, including Approximation Bayesian computation (ABC). We then examined whether the island area, elevation</span>, <span>distance from the surrounding landmasses and historical event (bottleneck) explain the shell colour diversity on each island using a phylogenetic generalised linear </span>mixed<span> model (PGLMM).</span></p> <p><strong><span>Results:</span></strong><span> Snails could be genetically categorised according to the island they inhabited, and on Niijima, their genetic structure was further divided within the island. The divergence times among the extant populations of the snail dated back to 2.1 million years ago (Ma), which is older than that of other animals occurring in this region. Additionally, island elevation positively affected shell colour diversity, and populations with similar shell colour profiles were phylogenetically different.</span></p> <p><strong><span>Main conclusions: </span></strong><span>Island land snails diversified early in the ecosystem of the Izu Islands. This suggests that proximity to the mainland, immobility and the physiological tolerance of passive dispersal in land snails were the main causes of early diversification. Moreover, our study proposes that environments covarying with elevation would determine shell colour diversity on each island through natural selection.</span></p>
FIG. 3 in A critical review of cyanobacteria distribution and cyanotoxins occurrence in Atlantic Ocean islands
FIG. 3. — Percentage of total common and unique cyanobacteria species between three habitat groups.
FIG. 5 in A critical review of cyanobacteria distribution and cyanotoxins occurrence in Atlantic Ocean islands
FIG. 5. — Environmental conditions contributing to the occurrence of cHABs in insular ecosystems.
FIG. 1 in Molecular characterization and morpho-taxonomy of Gambierdiscus caribaeus Vandersea, Litaker, M.A.Faust, Kibler, W.C.Holland & P.A.Tester (Dinophyceae) from Mauritius Island, South-West Indian Ocean
FIG. 1. — Map showing the three locations where samples were collected from Mauritius.
Data from: Jeju Island: a sentinel for tracking ocean warming impacts on high-latitude benthic communities
<p>As climate changes and anthropogenic pressures increase, marine ecosystem assembly and functioning are altered. High-latitude areas may provide opportunities for some tropical and subtropical organisms to survive. Yet, it is difficult to assess ongoing changes as ecological baselines are often missing. Here, we focus on the rapidly warming region of Jeju Island (South Korea), where thermal changes may have already triggered a poleward expansion of tropical and subtropical taxa and changes in community assembly. In 2012–2014, an island-wide quantitative description of its benthic communities (5 m and 15 m depths) was made, whereas patterns in seawater temperatures were examined from 1981 to 2020. The Jeju Island algal assemblage was dominated by the regionally endemic kelp, <em>Ecklonia</em> <em>cava</em>. Turf, encrusting coralline algae, alongside tropical, subtropical, and cosmopolitan macro-algae were also major components of the benthic community. Hermatypic coral cover was higher at the 15 m depth than 5 m depth. Increases in seawater temperatures were highly significant, with differences between the average annual SST [1980–2020] and annual SST reaching up to + 1.61 °C in only 40 yr. The thermal rise was more pronounced in winter than summer, and warming was further accompanied by a major decline in the number of days below 14 °C and 18 °C, which are considered critical thermal thresholds for hermatypic coral survival and reef development, respectively. Warming winter seawater temperatures could ultimately lead to a loss of seasonality and profound modifications of benthic assemblages. This study provides the necessary assessment of benthic community conditions at Jeju Island upon which the ongoing changes in the area can be explicitly demonstrated.</p>
Killer whale acoustic patterns respond to prey abundance and environmental variability around the Prince Edward Islands, Southern Ocean
<p>Killer whales are apex predators with temporally and spatially varying distributions throughout the world’s oceans. Their ecology and behaviour are poorly understood in most regions due to limited research, often because of logistical challenges. Here, we use easily deployable year-round passive acoustic monitoring device to investigate the seasonal acoustic occurrence and diel vocalizing behaviour of killer whales around the remote sub-Antarctic Prince Edward Islands (PEIs), Southern Ocean. Killer whales showed diel vocalizing patterns that varied seasonally in relation to their prey abundance and social activities. Killer whale calls were intermittently detected year-round with a high number of hours containing calls in October through December, and a secondary peak in March through May, which corresponded to the abundance of seal prey. Random forest modelling identified wind speed as an important predictor of the occurrence of killer whale calls whilst sea surface height, chlorophyll-a, and sea surface temperature were moderately important. We provide the first acoustic evidence that killer whale occurrence around PEIs coincide with variability in environmental conditions and prey abundance. Our results provide the first indication of diel vocalizing pattern of killer whales in the Southern Ocean. This knowledge is important for understanding killer whale ecology and adaptation to the changing oceans.</p>
Genetic legacies of mega-landslides: Cycles of isolation and contact across flank collapses in an oceanic island
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Climate controls plant life form patterns on a high-elevation oceanic island
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Data from: Does biological intimacy shape ecological network structure? A test using a brood pollination mutualism on continental and oceanic islands
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Frugivory and seed predation of fishtail palm (Caryota mitis Lour.) on the remote oceanic island of Narcondam, India
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Data from: Environmental heterogeneity dynamics drive plant diversity on oceanic islands
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EST-SSR genotyping data from: Ecotype variation in the endemic tree Callicarpa subpubescens on small oceanic islands: Genetic, phenotypic, and environmental insights
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Interannual structure of the bathyal deep-sea food-web at South Sandwich Islands (Southern Ocean): Stable isotope values of 𝛅13C and 𝛅15N
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Evolutionary history of inshore oceanic island land snails diversified in shell colour
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Data from: Specific island biogeographic and landscape features shape plant diversity and habitat specialism on edaphic quartz islands in an arid ocean
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Allen Brain Atlas
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International Brain Laboratory public data
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OpenNeuro
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