ORCID Profile
0000-0002-4174-8467
Current Organisation
Pontificia Universidad Javeriana
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Publisher: Elsevier BV
Date: 05-2022
DOI: 10.1016/J.TTBDIS.2022.101909
Abstract: Ehrlichia canis (Rickettsiales Anaplasmataceae) is one of the most prevalent tick-borne pathogens of dogs globally. The bacterium infects monocytes and is the aetiological agent of canine monocytic ehrlichiosis. For many decades Australia was thought to be free of the pathogen, but this abruptly changed in May 2020 when E. canis was detected in several dogs from Kununurra, Western Australia. Subsequent surveillance activities found unexpectedly large scale spread of E. canis throughout much of northern Australia. To gain insight into the genetic relationships of the Australian strain and its potential origin, we undertook a genomic analysis of E. canis positive domestic dog and tick (Rhipicephalus linnaei) s les from the north of Western Australia, the far north of South Australia and the Northern Territory, covering thousands of square kilometres. We obtained complete E. canis genomes from each of the three states, plus an additional 16 partial genomes, substantially increasing publicly available E. canis genetic resources. The Australian E. canis genomes were highly conserved across large geographic distances. Outside of Australia, the genomes were most similar to E. canis YZ-1 from China, although few reference sequences were available. We analysed the variable trp36 gene to obtain greater phylogenetic signal, which demonstrated that the Australian E. canis belonged to the Taiwan genotype, comprised of s les from Taiwan, China, Thailand and Turkey. Taken together, our findings suggest that E. canis in Australia may have originated from Asia or the Middle East and spread throughout northern and central Australia following its introduction.
Publisher: American Association for the Advancement of Science (AAAS)
Date: 22-02-2019
Publisher: Springer Science and Business Media LLC
Date: 24-08-2023
Publisher: Springer Science and Business Media LLC
Date: 25-07-2012
DOI: 10.1038/NATURE11318
Abstract: The rapid disruption of tropical forests probably imperils global bio ersity more than any other contemporary phenomenon. With deforestation advancing quickly, protected areas are increasingly becoming final refuges for threatened species and natural ecosystem processes. However, many protected areas in the tropics are themselves vulnerable to human encroachment and other environmental stresses. As pressures mount, it is vital to know whether existing reserves can sustain their bio ersity. A critical constraint in addressing this question has been that data describing a broad array of bio ersity groups have been unavailable for a sufficiently large and representative s le of reserves. Here we present a uniquely comprehensive data set on changes over the past 20 to 30 years in 31 functional groups of species and 21 potential drivers of environmental change, for 60 protected areas stratified across the world’s major tropical regions. Our analysis reveals great variation in reserve ‘health’: about half of all reserves have been effective or performed passably, but the rest are experiencing an erosion of bio ersity that is often alarmingly widespread taxonomically and functionally. Habitat disruption, hunting and forest-product exploitation were the strongest predictors of declining reserve health. Crucially, environmental changes immediately outside reserves seemed nearly as important as those inside in determining their ecological fate, with changes inside reserves strongly mirroring those occurring around them. These findings suggest that tropical protected areas are often intimately linked ecologically to their surrounding habitats, and that a failure to stem broad-scale loss and degradation of such habitats could sharply increase the likelihood of serious bio ersity declines.
Publisher: American Association for the Advancement of Science (AAAS)
Date: 06-12-2019
Abstract: Habitat fragmentation caused by human activities has consequences for the distribution and movement of organisms. Betts et al. present a global analysis of how exposure to habitat fragmentation affects the composition of ecological communities (see the Perspective by Hargreaves). In a dataset consisting of 4489 animal species, regions that historically experienced little disturbance tended to harbor a higher proportion of species vulnerable to fragmentation. Species in more frequently disturbed regions were more resilient. High-latitude areas historically experienced more disturbance and harbor more resilient species, which suggests that extinction has removed fragmentation-sensitive species. Thus, conservation efforts to limit fragmentation are particularly important in the tropics. Science , this issue p. 1236 see also p. 1196
Publisher: Springer Science and Business Media LLC
Date: 04-10-2023
Publisher: Wiley
Date: 11-02-2020
DOI: 10.1111/ELE.13471
Publisher: Wiley
Date: 27-03-2014
DOI: 10.1002/ECE3.1036
Location: Mexico
No related grants have been discovered for J. Nicolas Urbina-Cardona.