Late Quaternary Sea-Level Changes and the Palaeohistory of Palawan Island, Philippines

Robles, Emil; Piper, Philip J.; Ochoa, Janine; Lewis, Helen; Paz, Victor; Ronquillo, Wilfredo P.

doi:10.1080/15564894.2014.880758

Cited by 27 publications

(17 citation statements)

References 56 publications

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“…The colonization from northern Borneo to Palawan may therefore have been possible at this time, assuming short distances for overseas dispersal. A terrestrial connection between Borneo and Palawan by an exposed narrow land bridge would have been possible only during the Late Quaternary (Middle Pleistocene) with sea-level fluctuations of at least 135 m below present-day levels (Heaney, 1986;McGuire and Alcala, 2000;McGuire and Kiew, 2001;Brown et al 2013;Robles et al, 2015).…”

Section: Spatio-temporal Patterns Of Diversificationmentioning

confidence: 99%

Unexpectedly high levels of lineage diversity in Sundaland puddle frogs (Dicroglossidae: Occidozyga Kuhl and van Hasselt, 1822)

Flury

Haas

Brown

et al. 2021

Molecular Phylogenetics and Evolution

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One of the most urgent contemporary tasks for taxonomists and evolutionary biologists is to estimate the number of species on earth. Recording alpha diversity is crucial for protecting biodiversity, especially in areas of elevated species richness, which coincide geographically with increased anthropogenic environmental pressures -the world's so-called biodiversity hotspots. Although the distribution of Puddle frogs of the genus Occidozyga in South and Southeast Asia includes five biodiversity hotspots, the available data on phylogeny, species diversity, and biogeography are surprisingly patchy. Samples analyzed in this study were collected throughout Southeast Asia, with a primary focus on Sundaland and the Philippines. A mitochondrial gene region comprising ~ 2000 bp of 12S and 16S rRNA with intervening tRNA Valine and three nuclear loci (BDNF, NTF3, POMC) were analyzed to obtain a robust, time-calibrated phylogenetic hypothesis. We found a surprisingly high level of genetic diversity within Occidozyga, based on uncorrected p-distance values corroborated by species delimitation analyses. This extensive genetic diversity revealed 29 evolutionary lineages, defined by the > 5% uncorrected p-distance criterion for the 16S rRNA gene, suggesting that species diversity in this clade of phenotypically homogeneous forms probably has been underestimated. The comparison with results of other anuran groups leads to the assumption that anuran species diversity could still be substantially underestimated in Southeast Asia in general. Many genetically divergent lineages of frogs are phenotypically similar, indicating a tendency towards extensive morphological conservatism. We present a biogeographic reconstruction of the colonization of Sundaland and nearby islands which, together with our temporal framework, suggests that lineage diversification centered on the landmasses of the northern Sunda Shelf. This remarkably genetically structured group of amphibians could represent an exceptional case for future studies of geographical structure and diversification in a widespread anuran clade spanning some of the most pronounced geographical barriers on the planet (e.g., Wallace's Line). Studies considering gene flow, morphology, ecological and bioacoustic data are needed to answer these questions and to test whether observed diversity of Puddle frog lineages warrants taxonomic recognition.

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Section: Spatio-temporal Patterns Of Diversificationmentioning

confidence: 99%

Unexpectedly high levels of lineage diversity in Sundaland puddle frogs (Dicroglossidae: Occidozyga Kuhl and van Hasselt, 1822)

Flury

Haas

Brown

et al. 2021

Molecular Phylogenetics and Evolution

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“…bp (Fox 1970). Another large mollusc accumulation at Sa'gung rock-shelter remains undated, but is probably also of Mid Holocene age (Kress 2004; Robles et al 2015).…”

Section: Environmental Change and Human Subsistence Strategiesmentioning

confidence: 99%

The Philippines fromc.14,000 to 4,000 cal.bpin Regional Context

Pawlik¹,

Piper

2018

CAJ

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In this paper, we review the current Philippine archaeological record between c. 14,000 and 4000 cal. bp in the context of our developing understanding of human adaptation to post-glacial environments at the end of the Pleistocene, and the cultural and technological changes that were occurring across Southeast Asia during this period. Due to their location at the northwestern fringes of Wallacea, close proximity to Borneo and Taiwan, and the long Palawan coastline bordering the southern margins of the South China Sea, the Philippines have likely acted as a conduit for the movements of people, material culture and ideas between the islands of Southeast Asia throughout prehistory. Current research suggests that the Philippines were possibly embedded in larger maritime networks from the Late Pleistocene onwards. This appears to have been a period of significant social change and technological innovation, as illustrated by the appearance of new organic and inorganic technologies and the emergence of diverse burial traditions across Southeast Asia. These included sophisticated fishing strategies, techniques of hafting and composite tool production, and long-distance interaction across the Philippine archipelago and Island Southeast Asia perhaps as far as Near Oceania.

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“…Although Pleistocene archaeological records are rare in Wallacea, the situation is beginning to improve, with new sites recorded and sequences analyzed in the past few years (O' Connor 2007;O'Connor et al 2010;Pawlik et al 2015;Robles et al 2015;Samper Carro et al 2016;Szabó, Brumm, and Bellwood 2007). In particular, the zooarchaeological records produced on several Wallacean islands allow for the examination of some of the factors that may have been influential in facilitating dispersals in the region.…”

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confidence: 99%