Application of Sentinel-2 Multispectral Data for Habitat Mapping of Pacific Islands: Palau Republic (Micronesia, Pacific Ocean)

Immordino, Francesco; Barsanti, Mattia; Candigliota, Elena; Cocito, Silvia; Delbono, Ivana; Peirano, Andrea

doi:10.3390/jmse7090316

Cited by 18 publications

(12 citation statements)

References 32 publications

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“…The Sentinel‐2 satellite provides high‐resolution (˜10 m 2 ) multispectral imagery with 13 bands in the visible, near infrared, and shortwave infrared parts of the light spectrum (Immordino et al . 2019). Cloud‐free images were obtained from the middle of our field survey period (11 December 2019).…”

Section: Methodsmentioning

confidence: 99%

“…To assess the habitats used by TWBP during the breeding season, we obtained freely available Sentinel-2 satellite images (http://glovis.usgs.gov). The Sentinel-2 satellite provides high-resolution (~10 m 2 ) multispectral imagery with 13 bands in the visible, near infrared, and shortwave infrared parts of the light spectrum (Immordino et al 2019). Cloud-free images were obtained from the middle of our field survey period (11 December 2019).…”

Section: Gis Analysismentioning

confidence: 99%

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Breeding habitats, phenology and size of a resident population of Two‐banded Plover (Charadrius falklandicus) at the northern edge of its distribution

et al. 2021

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The central‐peripheral hypothesis states that the demographic performance of a species decreases from the centre to the edge of its range. Peripheral populations are often smaller and tend to occur under different and suboptimal conditions from those of core populations. Peripheral populations can also coexist during part of their annual cycle with populations from the core of the species’ range. Studies on peripheral populations are thus valuable for broadly understanding ecological and evolutionary processes. The Two‐banded Plover (TWBP, Charadrius falklandicus, Charadriidae) is an endemic South American shorebird that breeds in Argentine and Chilean Patagonia and migrates northward during the Austral winter. There are breeding records, however, from Lagoa do Peixe National Park in southern Brazil. In this study, we (i) mapped TWBP nests, (ii) characterised their reproductive biology and nesting habitats, (iii) colour‐marked birds and evaluated their seasonal occurrence patterns and (iv) estimated the size of the Brazilian population by combining supervised habitat classification analyses and generalised additive models. We estimated that the Brazilian population has 55 (95% CI: 44.1–66.6) breeding pairs and found that the length of their breeding season was roughly 5 months, spanning the Austral spring and summer. The population’s nesting habitat differed, and their apparent reproductive success was lower than that of core populations. Unlike more southerly populations, the results of our mark‐resighting efforts demonstrate that the Brazilian population is sedentary. Taken together, these results indicate that the Brazilian TWBP population seems geographically isolated from the species’ southernmost core populations, resulting in a heteropatric distribution. Furthermore, differences in nesting habitat and year‐round residency indicate that this peripheral population is ecologically distinct. The marked behavioural and ecological differences combined with the small population at the northern edge of the TWBP distribution support the central‐peripheral hypothesis in a Neotropical system.

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Section: Methodsmentioning

confidence: 99%

Section: Gis Analysismentioning

confidence: 99%

Breeding habitats, phenology and size of a resident population of Two‐banded Plover (Charadrius falklandicus) at the northern edge of its distribution

et al. 2021

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“…Modern references were also used to examine more recent landuse changes (16, 36, 37), primarily on Babeldaob, which has the most extensive watersheds and where the majority of agricultural production takes place. Studies examining changes to reefs and other marine habitats historically and in the modern era were also integrated into our overall assessment (17,(38)(39)(40).…”

Section: Archaeological and Ecological Backgroundmentioning

confidence: 99%

Tropical islands of the Anthropocene: Deep histories of anthropogenic terrestrial–marine entanglement in the Pacific and Caribbean

Fitzpatrick

Giovas

2021

Proc. Natl. Acad. Sci. U.S.A.

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Islands are useful model systems for examining human–environmental interactions. While many anthropogenic effects visible in the archaeological and paleoecological records are terrestrial in nature (e.g., clearance of tropical forests for agriculture and settlement; introduction of nonnative flora and fauna), native peoples also relied heavily on marine environments for their subsistence and livelihood. Here we use two island case studies—Palau (Micronesia) and the Lesser Antilles (Caribbean)—and approach their long-term settlement history through a “ridge-to-reef” perspective to assess the role that human activity played in land- and seascape change over deep time. In particular, we examine the entanglement of terrestrial and marine ecosystems resulting from anthropogenic effects and cultural responses to socio-environmental feedback. We suggest that on the humanized tropical islands of the Anthropocene, mangroves, near shore and littoral areas, and coral reefs were major sites of terrestrial–marine interface chronicling and modulating anthropogenic effects.

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“…Sentinel-2 [62], a European Space Agency's satellite, can be compared to Landsat satellites in terms of spatial and spectral resolution. Sentinel-2 was initially designed for land monitoring [63] but has been used for monitoring oceans (and more specifically coral reefs bleaching) and mapping benthic habitat [64][65][66][67][68][69][70]. Specific spectral bands of Sentinel-2, such as SWIR-cirrus and water vapor bands, are especially useful for cloud detection and removal algorithms [71][72][73][74][75].…”

Section: Satellite Datamentioning

confidence: 99%

Mapping of Coral Reefs with Multispectral Satellites: A Review of Recent Papers

et al. 2021

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Coral reefs are an essential source of marine biodiversity, but they are declining at an alarming rate under the combined effects of global change and human pressure. A precise mapping of coral reef habitat with high spatial and time resolutions has become a necessary step for monitoring their health and evolution. This mapping can be achieved remotely thanks to satellite imagery coupled with machine-learning algorithms. In this paper, we review the different satellites used in recent literature, as well as the most common and efficient machine-learning methods. To account for the recent explosion of published research on coral reel mapping, we especially focus on the papers published between 2018 and 2020. Our review study indicates that object-based methods provide more accurate results than pixel-based ones, and that the most accurate methods are Support Vector Machine and Random Forest. We emphasize that the satellites with the highest spatial resolution provide the best images for benthic habitat mapping. We also highlight that preprocessing steps (water column correction, sunglint removal, etc.) and additional inputs (bathymetry data, aerial photographs, etc.) can significantly improve the mapping accuracy.

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Application of Sentinel-2 Multispectral Data for Habitat Mapping of Pacific Islands: Palau Republic (Micronesia, Pacific Ocean)

Cited by 18 publications

References 32 publications

Breeding habitats, phenology and size of a resident population of Two‐banded Plover (Charadrius falklandicus) at the northern edge of its distribution

Breeding habitats, phenology and size of a resident population of Two‐banded Plover (Charadrius falklandicus) at the northern edge of its distribution

Tropical islands of the Anthropocene: Deep histories of anthropogenic terrestrial–marine entanglement in the Pacific and Caribbean

Mapping of Coral Reefs with Multispectral Satellites: A Review of Recent Papers

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