The effect of climatic change on southeast Asian geomorphology

Verstappen, H. Th.

doi:10.1002/(sici)1099-1417(199709/10)12:5<413::aid-jqs324>3.0.co;2-p

Cited by 41 publications

(21 citation statements)

References 5 publications

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“…During periods of lowered sea level, the increase in exposed land area led to decreasing moisture content of the monsoon winds, resulting in cooler and drier conditions. Likewise, moisture content increased and seasonality decreased during warmer periods of marine transgression (Heaney, 1991;Verstappen, 1997). Despite these periodic marine transgressions associated with warming events, much of the Sunda Shelf was emergent throughout the Neogene (23-2.6 Mya) (Hall, 2001).…”

Section: Paleoclimate and Paleovegetation Of Indochinamentioning

confidence: 99%

“…2.5 Mya) the earth began experiencing more rapid and dramatic shifts in climate associated with fluctuations in the extent of polar ice sheets and overall climates became drier and more seasonal than during the Neogene (Verstappen, 1997;Hewitt, 2000;Hope et al, 2004). At the Last Glacial Maximum (LGM; 18,000 years ago) the winter monsoon strengthened and the summer monsoon weakened; as a result rainfall over the Sunda Shelf may have been 30%-50% lower than present levels.…”

Section: Paleoclimate and Paleovegetation Of Indochinamentioning

confidence: 99%

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A Biogeographic Synthesis of the Amphibians and Reptiles of Indochina

Bain

Hurley

2011

Bulletin of the American Museum of Natural History

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Section: Paleoclimate and Paleovegetation Of Indochinamentioning

confidence: 99%

Section: Paleoclimate and Paleovegetation Of Indochinamentioning

confidence: 99%

A Biogeographic Synthesis of the Amphibians and Reptiles of Indochina

Bain

Hurley

2011

Bulletin of the American Museum of Natural History

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“…More recently, it has been severely affected by the Pleistocene climatic oscillations (4) of the Quaternary. Changes in sea levels resulted in the cyclical exposure of the continental shelf and the formation of land bridges between the islands (4,5), allowing for species interchange with subsequent isolation (6). Moreover, climatic fluctuations were accompanied by vegetation changes (2,7,8), with shifts in the range and elevational distribution of rainforests.…”

mentioning

confidence: 99%

Effects of Pleistocene glaciations and rivers on the population structure of Bornean orangutans ( Pongo pygmaeus )

Arora

Nater

Schaik

et al. 2010

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

141

107

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Sundaland, a tropical hotspot of biodiversity comprising Borneo and Sumatra among other islands, the Malay Peninsula, and a shallow sea, has been subject to dramatic environmental processes. Thus, it presents an ideal opportunity to investigate the role of environmental mechanisms in shaping species distribution and diversity. We investigated the population structure and underlying mechanisms of an insular endemic, the Bornean orangutan (Pongo pygmaeus). Phylogenetic reconstructions based on mtDNA sequences from 211 wild orangutans covering the entire range of the species indicate an unexpectedly recent common ancestor of Bornean orangutans 176 ka (95% highest posterior density, 72-322 ka), pointing to a Pleistocene refugium. High mtDNA differentiation among populations and rare haplotype sharing is consistent with a pattern of strong female philopatry. This is corroborated by isolation by distance tests, which show a significant correlation between mtDNA divergence and distance and a strong effect of rivers as barriers for female movement. Both frequency-based and Bayesian clustering analyses using as many as 25 nuclear microsatellite loci revealed a significant separation among all populations, as well as a small degree of male-mediated gene flow. This study highlights the unique effects of environmental and biological features on the evolutionary history of Bornean orangutans, a highly endangered species particularly vulnerable to future climate and anthropogenic change as an insular endemic.Asian great ape | genetic structure | radiation | geographical barriers | sociobehavioral barriers

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“…Tidak begitu banyak penelitian terkait kondisi iklim di karst Gunung Sewu. Penelitian paling mutakhir tentang kondisi iklim di Gunungsewu di antaranya dilakukan oleh Verstappen (1997) dan Urushibara-Yoshino dan Yoshino (1997). Penelitian-penelitian sebelumnya terkait iklim pada periode Kuarter di sekitar wilayah penelitian (Pulau Jawa) dilakukan oleh Urushibara-Yoshino (1995), Verstappen (1975;1994), Dam (1994), Morley (1982), dan Budel (1975).…”

Section: Iklimunclassified

Variasi Spasial-Temporal Hidrogeokimia Dan Sifat Aliran Untuk Karakterisasi Sistem Karst Dinamis Di Sungai Bawah Tanah Bribin, Kabupaten Gunung Kidul, Diy

Adji¹

2017

Preprint

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Penelitian ini dilakukan pada kawasan bertopografi karst, yaitu daerahtangkapan Sungai Bawah Tanah (SBT) Bribin yang secara administratif terletak diKabupaten Gunungkidul, Propinsi Daerah Istimewa Yogyakarta. Tujuan dari penelitianini adalah: (1) menganalisis variasi spasial dan temporal karakteristik dan persentasealiran dasar (PAD) SBT Bribin; (2) mengevaluasi karakter hidrogeokimia SBT Bribindan mencari hubungan dengan sifat alirannya; (3) mengkarakterisasi kondisi SistemKarst Dinamis (SKD) SBT Bribin yang didekati dengan paramater tingkat agresivitasair terhadap batuan gamping dan hubungannya dengan kondisi paramater SKD SBTBribin sepanjang tahun.Untuk mengetahui karakteristik aliran dan PAD, tiga alat pencatat fluktuasimuka air SBT dipasang di hulu, hilir, dan bocoran SBT Bribin selama satu tahun, danpengukuran debit aliran dilakukan untuk memperoleh kurva hubungan debit dan tinggimuka air SBT. Kemudian, dilakukan pemisahan aliran dasar dengan cara digitalfiltering untuk menghitung besarnya PAD setelah sebelumnya dihitung nilai konstantaresesi aliran diffuse, fissure, dan conduitnya. Untuk mengetahui karakter hidrogeokimiaSBT, sebanyak 120 sampel air diambil dan dianalisis sepanjang tahun di SBT Bribinyang meliputi air tetesan gua, air hujan, dan air SBT. Scatter plot antar parameterhidrogeokimia kemudian dilakukan untuk mengetahui hubungan antara PAD danhidrogeokimia, serta untuk mengetahui proses hidrogeokimia yang terjadi. Selanjutnya,untuk mengetahui tingkat agresivitas air SBT dilakukan analisis Indeks Kejenuhanterhadap mineral kalsit, sedangkan hubungan antar parameter SKD pada gua di bagianhulu dan hilir dilakukan untuk mengkarakterisasi kondisi SKD sepanjang SBT Bribin.Hasil penelitian menunjukkan bahwa terdapat perbedaan karakteristik aliransungai bawah tanah secara temporal dan spasial di SBT Bribin karena adanya perbedaansifat akuifer karst untuk melepaskan komponen aliran diffuse, fissure, dan conduit. Halini mengakibatkan adanya perbedaan karakteristik PAD di sepanjang SBT Bribin.Selanjutnya, karakteristik PAD berpengaruh terhadap karakter hidrogeokimia sungaibawah tanah terutama pada musim kemarau. Pada musim hujan, hidrogeokimia sungaibawah tanah lebih dipengaruhi oleh kejadian banjir yang mengakibatkan turunnya PADkarena adanya proses pengenceran oleh air hujan (dilution by precipitation) yangmenaikkan kandungan CO2 dalam air. Secara umum, gua di hilir SBT Bribin lebihbersifat agresif untuk melarutkan batuan gamping dibandingkan gua di daerah hulukarena adanya perbedaan sifat pelorongan gua, dimana bagian hilir mempunyai sifatpelorongan terbuka sehingga selalu ada pasokan gas karbondioksida untuk mendukungproses pelarutan.

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The effect of climatic change on southeast Asian geomorphology

Cited by 41 publications

References 5 publications

A Biogeographic Synthesis of the Amphibians and Reptiles of Indochina

A Biogeographic Synthesis of the Amphibians and Reptiles of Indochina

Effects of Pleistocene glaciations and rivers on the population structure of Bornean orangutans ( Pongo pygmaeus )

Variasi Spasial-Temporal Hidrogeokimia Dan Sifat Aliran Untuk Karakterisasi Sistem Karst Dinamis Di Sungai Bawah Tanah Bribin, Kabupaten Gunung Kidul, Diy

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