Jason R Ali

Jason R Ali
The University of Hong Kong | HKU · Department of Earth Sciences

PhD Univ. Southampton (October 1985-January 1989)

About

206
Publications
71,425
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Citations
Introduction
Presently, my research focus is biogeography. I am mainly interested in the geo-physical processes that have shaped the distribution of life around the planet, a key target being the land animals on the marine islands.
Additional affiliations
April 1997 - August 2017
The University of Hong Kong
Position
  • Professor
April 1997 - March 2020
The University of Hong Kong
Position
  • Professor (Associate)
February 1989 - August 1995
University of Southampton
Position
  • Post-Doctoral Fellow working mainly on paleomagnetic-tectonic modelling studies of various parts of Indonesia

Publications

Publications (206)
Article
Based on a comprehensive literature survey, we determined the sources of the terrestrial vertebrate species on Christmas Island, asking where they originated relative to Wallace’s Line (the southern end of the divide lies 1100 km to the east, where the Lombok Strait adjoins the eastern Indian Ocean). The two bats, Pipistrellus murrayi and Pteropus...
Article
Due to its position between the highly distinct Oriental and Australasian biogeographical realms, much effort has been spent demarcating associated separations and transitions in the faunal assemblages of the Indo‐Australian Archipelago. Initially, sharp boundary lines were proposed, with the earliest dating from the mid‐1800s. Notably, the one pub...
Article
Full-text available
Based on a synthesis of new molecular phylogenetic data, a detailed review is presented for the origins of the Galápagos’ native land-locked vertebrates [42 species; 11 clades: geckos (3), lava lizards (2), giant tortoises (1), iguanas (1), racer snakes (1) and oryzomyine rodents (3)]. Nine groups have roots in coastal Ecuador and Peru and would ha...
Article
Full-text available
Over the past three decades, the hypothesized mid-Cenozoic GAARlandia walkway (34 ± 1 Ma) has featured prominently in discussions on Caribbean biogeography. However, a fundamental issue has been a lack of geological and geophysical data from the Aves Ridge with which to evaluate the proposal. Consequently, opinions have been based purely on biologi...
Article
Full-text available
Further to the debate associated with the viability of land-bound mammals being able to colonize remote frontiers by way of long-distance over-water dispersal, observations are documented of monkeys (red howlers, Alouatta seniculus) occupying free-standing trees within a large floating island on the Magdalena River in north-west Colombia. Also, we...
Article
Results are reported of what is believed to be the first survey of the quantitative contributions Earth scientists make to their research publications. Based on a return of 26 (from 45; 254 total documents), two key patterns are observed. For most articles, there is a steady decrease in the roles of the first through fifth authors. The former fall...
Article
Full-text available
Based on a comprehensive literature survey, we determined the sources of the terrestrial vertebrate species on Christmas Island, asking where they originated relative to Wallace’s Line (the southern end of the divide lies 1100 km to the east, where the Lombok Strait adjoins the eastern Indian Ocean). The two bats, Pipistrellus murrayi and Pteropus...
Article
Geological data indicate that the interpretation for the age-calibrated phylogeny for the Kurixalus-genus frogs of South, Southeast and East Asia (Lv et al., 2018) needs to be rethought A B S T R A C T Recently, Lv et al. (2018) published an age-calibrated phylogenetic tree for the Kurixalus frogs, members of which occur across parts of South, Sout...
Article
Christmas Island in the eastern Indian Ocean forms the pinnacle of a once-drowned, coral atoll. Exactly when the seamount re-emerged above the seas is, unfortunately, imprecisely understood. One of the consequences of this uncertainty is that it can hamper studies dealing with its landlocked faunal assemblage. We attempt to address this issue using...
Article
Using the land-bound vertebrates on the marine islands as model organisms, two metrics are presented that permit quantitative and succinct synopses of the 'evolutionary maturity' of the hosted faunal assemblages. In turn, these reflect the geo-physical settings and geological developments of the substrates. The assemblage lineage-taxonomy spectrum...
Article
Full-text available
In the absence of evidence suggesting former ice or land bridges, the colonization of remote landmasses by non‐aquatic, non‐flying vertebrates is thought to result from long‐distance over‐water rafting (LDOR). However, Mazza et al. (2019) challenge the notion that mammals can make such journeys citing their perceived physiological inadequacies. The...
Article
Models for biodiversity growth on the remote oceanic islands assume that in situ cladogenesis is a major contributor. To test this, we compiled occurrence data for 194 terrestrial reptile species on 53 volcanically-constructed middle-to low-latitude landmasses worldwide. Despite 273 native island-species records, there are only 8-12 cases of the ph...
Article
Models for biodiversity growth on the remote oceanic islands assume that in situ cladogenesis is a major contributor. To test this, we compiled occurrence data for 194 terrestrial reptile species on 53 volcanically-constructed middle- to low-latitude landmasses worldwide. Despite 273 native island-species records, there are only 8–12 cases of the p...
Article
Models for biodiversity growth on the remote oceanic islands assume that in situ cladogenesis is a major contributor. To test this, we compiled occurrence data for 194 terrestrial reptile species on 53 volcanically‐constructed middle‐ to low‐latitude landmasses worldwide. Despite 273 native island‐species records, there are only 8–12 cases of the p...
Article
Full-text available
Aim Describe the main geo‐physical features of the various sorts of marine islands that are associated with the continents and consider how the ontogenetic pathways of each landmass type might have shaped the hosted biotas. Location Global. Methods Review of the literature that underpins understanding of the “continental” marine islands, particul...
Article
Northwestern Ilocos Norte in Luzon, Philippines, exposes cherts, peridotite and a variety of metamorphic rocks including chlorite schist, quartzo-feldspathic schist, muscovite schist and actinolite schist. These rocks are incorporated within a tectonic mélange, the Dos Hermanos Mélange, which is thrust onto the turbidite succession of the Eocene Ba...
Article
Recent interpretations of various floral and faunal components on Hainan Island and the nearby parts of mainland east Asia invoke a mid-Cenozoic plate-tectonic rifting episode that displaced the landmass ca 220 km south-eastwards from a postulated former site directly adjacent to the China- Vietnam border. However, having sifted through the relevan...
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Full-text available
Models that support a single collision scenario for India and Eurasia are incompatible with the evidence that an intra-oceanic island arc (IOIA) existed within the Neotethyan Ocean. Understanding the spatial and temporal extent of any IOIA is crucial for India-Eurasia collision studies as the entire ocean, including any intra-oceanic features, must...
Article
Jason R Ali discusses oceanic island subsidence and the shaping of biodiversity on the Galápagos archipelago – or what Darwin missed.
Article
Models that support a single collision scenario for India and Eurasia are incompatible with the evidence that an intra-oceanic island arc (IOIA) existed within the Neotethyan Ocean. Understanding the spatial and temporal extent of any IOIA is crucial for India-Eurasia collision studies as the entire ocean, including any intra-oceanic features, must...
Article
The ~289 Ma Panjal Traps of NW India (Kashmir) are part of a series of rift-related mafic suites (Abor, Sikkim etc.) that were erupted onto northern India (present-day coordinates) around the same time as separation of the Cimmerian blocks of Qiangtang and Sibumasu. We report new data from only the second paleomagnetic investigation of this unit. S...
Article
Full-text available
The current distribution of biotic lineages that emerged in the deep time has both theoretical and practical implications, in particular for understanding the processes that have forged present-day biodiversity and informing local and regional-scale conservation efforts. To date however, there has been no examination of such patterns globally acros...
Article
Full-text available
Madagascar is well known for producing exceptional fossils. However, the record for selachi-ans remains relatively poorly known. Paleontological reconnaissance on the island of Nosy Makamby, off northwest Madagascar, has produced a previously undescribed assemblage of Miocene fossils. Based on isolated teeth, ten taxonomic groups are identified: Ot...
Article
Ocean Drilling Program Site 1201 (19º 17.8'N, 135º 5.9' E) was drilled in the West Philippine Basin, about 100 km west of the inactive Palau-Kyushu Ridge and 450 km north of the extinct "Central Basin Fault" spreading center. A 509-m long Eocene to Miocene sedimentary sequence overlying middle Eocene (Chron C21n, ~47 Ma) basalts was recovered. Usin...
Article
Aim We constructed a series of high-resolution palaeogeographical models for the Galápagos archipelago for the last 700 kyr, accommodating thermal subsidence of the islands, eustatic sea-level change, and associated sea-floor loading. We assessed the possible impacts of these changes for the terrestrial fauna. Location The Galápagos Islands. Meth...
Article
Aim We constructed a series of high-resolution palaeogeographical models for the Gal apagos archipelago for the last 700 kyr, accommodating thermal subsidence of the islands, eustatic sea-level change, and associated sea-floor loading. We assessed the possible impacts of these changes for the terrestrial fauna. Location The Gal apagos Islands. Meth...
Article
Greater India's northern edge prior to collision with Asia is typically modelled as a rifted passive margin. We argue for a quite different geometry as a consequence of two tectonic episodes that happened sometime before the main impact. Whilst the western segment of India's northern boundary had formed in the Late Triassic as a rifted margin, the...
Article
Full-text available
Redbeds are an important source of palaeomagnetic data, but they often record inclinations shallower than that of the ancient local geomagnetic field. Discrepancy of palaeopoles from Cretaceous redbeds in South China Block (SCB) and the coeval Eurasia reference pole is commonly attributed to inclination shallowing. However, redbed-derived palaeomag...
Article
A palaeomagnetic investigation was carried out on a series of rift basalts (Woniusi Formation) that accumulated on the Baoshan block (SW China) in the Early Permian, the aim being to provide quantitative palaeogeographical information on the eastern Cimmerian terrane as it detached from eastern Gondwana. Reliable data were obtained from four locati...
Article
Full-text available
Analyses of phylogenetic topology and estimates of divergence timing have facilitated a reconstruction of Madagascar's colonization events by vertebrate animals, but that information alone does not reveal the major factors shaping the island's biogeographic history. Here, we examine profiles of Malagasy vertebrate clades through time within the con...
Data
Database summarizing biogeographic scenarios of Madagascar’s vertebrate fauna. Class was scored as 1 = Osteichthyes, 2 = Amphibia, 3 = Reptilia, 4 = Aves, 5 = Mammalia. Animals were scored as 1 = extinct or 2 = extant. Time was scored as 1 = Pre K-T, 2 = Post K-T to mid-Miocene, and 3 = mid Miocene to present. Source was scored as 1 = Gondwana, 2 =...
Article
Full-text available
A palaeomagnetic investigation was carried out on a series of rift basalts (Woniusi Formation) that accumulated on the Baoshan block (SW China) in the Early Permian, the aim being to provide quantitative palaeogeographical information on the eastern Cimmerian terrane as it detached from eastern Gondwana. Reliable data were obtained from four locati...
Article
Full-text available
How, when, and from where Madagascar's vertebrates arrived on the island is poorly known, and a comprehensive explanation for the distribution of its organisms has yet to emerge. We begin to break that impasse by analyzing vertebrate arrival patterns implied by currently existing taxa. For each of 81 clades, we compiled arrival date, source, and an...
Article
Full-text available
Age-dating of detrital zircons from 22 samples collected along, and adjacent to, the Yarlung Tsangpo suture zone, southern Tibet provides distinctive age-spectra that characterize important tectonostratigraphic units. Comparisons with data from Nepal, northern India and the Lhasa and Qiangtang terranes of central Tibet constrain possible sources of...
Article
Aim To evaluate the Gunnerus Ridge land-bridge hypothesis, which postulates a Late Cretaceous causeway between eastern Antarctica and southern Madagascar allowing the passage of terrestrial vertebrates. Location Eastern Antarctica, southern Indian Ocean, Madagascar. Methods The review involves palaeogeographical modelling, which draws upon geologic...
Article
Full-text available
Upper Paleocene–lower Eocene sequences of mainly pelagic sediments in DSDP Sites 549 and 550 of Goban Spur, NE Atlantic, representing time periods of 10 and 6 m.y. respectively, were examined to investigate the biotic response of radiolarians to the PETM. The preservation of radiolarians in the lower Eocene sequences for both sites is poor. Upper P...
Article
Radiolarians, extracted from cherts collected from an ophiolitic mélange near Salumi, Nagaland, NE India, have well-preserved tests and can be assigned to the Upper Jurassic (Kimmeridgian–lower Tithonian). These are the first well-preserved and clearly imaged radiolarians reported from the Naga Ophiolite. They are significantly older than fossils p...
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Full-text available
The Middle Permian Emeishan large igneous province of SW China is regard by many as providing the quintessential example of kilometre-scale pre-eruption domal uplift associated with mantle plume impingement on the base of the lithosphere. The key line of evidence for this has been the purported deep erosion profile of the Maokou Formation platform...
Article
The Middle Permian (c. 262 Ma) Emeishan Basalt Formation of SW China is a commonly cited example of a large igneous province (LIP) that formed as a result of a deep-mantle plume impinging on the base of the lithosphere and generating large regional-scale up-doming prior to volcanism. Recently, however, this assertion has been challenged on the grou...
Article
Full-text available
The Middle Permian (c. 262 Ma) Emeishan Basalt Formation of SW China is a commonly cited example of a large igneous province (LIP) that formed as a result of a deep-mantle plume impinging on the base of the lithosphere and generating large regional-scale up-doming prior to volcanism. Recently, however, this assertion has been challenged on the grou...
Article
The Middle Permian Emeishan large igneous province of SW China has provided the quintessential example of the phenomenon of kilometre-scale pre-eruption domal uplift associated with mantle plume impingement on the base of the lithosphere. One key line of evidence is an interpreted zone of truncation of the platform carbonates belonging to the Maoko...
Article
Full-text available
The discovery of two Early Cretaceous (mid-Valanginian–mid-Aptian range) radiolarian faunal assemblages from ribbon-bedded cherts collected near Photoskar in northern Ladakh, NW India, provides the first robust biostratigraphic age constraints associated with the Spongtang massif. This klippe of relict Neotethyan suprasubduction-zone ophiolitic roc...
Article
Full-text available
Madagascar hosts one of the world's most unusual, endemic, diverse and threatened concentrations of fauna. To explain its unique, imbalanced biological diversity, G. G. Simpson proposed the 'sweepstakes hypothesis', according to which the ancestors of Madagascar's present-day mammal stock rafted there from Africa. This is an important hypothesis in...