Papers by Juan Carlos T. Gonzalez
by Suzanne Livingstone, Joey Gatus, Richard K B Jenkins, Juan Carlos T. Gonzalez, Amanda Lane, David Milton, Caroline Pollock, Aziz Avci, Lutz Dirksen, Tiffany Doan, Hassan El Mouden, Tandora Grant, Jelka Crnobrnja-Isailovic, Sabine Vinke, Oliver Wearn, and Maria D R Castañeda M. Böhm). 1 Here considered to include the various taxa that belong to the non-avian and nonmamma... more M. Böhm). 1 Here considered to include the various taxa that belong to the non-avian and nonmammalian amniotes: Crocodylia, Testudines and Lepidosauria (snakes, lizards, amphisbaenians, tuataras).
Paradoxurus hermaphroditus
Fieldiana Zoology, 2008
Intensive inventory work on the Mt. Kitanglad massif of north-central Mindanao, Bukidnon Province... more Intensive inventory work on the Mt. Kitanglad massif of north-central Mindanao, Bukidnon Province, Republic of the Philippines, revealed a diverse avifauna. In all, 198 bird species were detected, of which about 172 were likely breeding in the area, placing the mountain among the most diverse sites that have been surveyed in the country. Three migratory species (Luscinia calliope, Turdus chrysolaus, and Motacilla alba) were detected on the island for the first time by contributors to this summary, and known ranges of several species were extended. The massif holds populations of at least 17 of the 18 species narrowly endemic to Mindanao-more than any other site yet studied-as well as almost half the species endemic to the entire Philippine archipelago. Endemic species are concentrated at higher elevations, whereas migrants and widespread species are more frequent in the lowlands. The Kitanglad massif, however, has been modified severely below about 1200 m, with removal of almost all lowland forest habitats. Records and data accumulated by historical collectors, recent collectors, and recent observers are compared and contrasted to reflect on the biases, strengths, and omissions in each. The importance of the Kitanglad region to effective conservation of biodiversity in the southern Philippines is particularly emphasized.
Proceedings of the Royal Society B: Biological Sciences, 2013
Reproductive cooperation in social animals has been the focus of intensive research, yet the role... more Reproductive cooperation in social animals has been the focus of intensive research, yet the role of environmental factors in promoting such cooperation remains uncertain. A recent global analysis suggested that cooperative breeding in birds is a 'bet-hedging' strategy associated with climatic uncertainty, but it is unclear whether this mechanism applies generally or is restricted to the insectivorous passerines that predominate as cooperative breeders at the global scale. Here, we use a phylogenetic framework to assess the effect of climate on the evolution of cooperation in hornbills (Bucerotidae), an avian family characterized by frugivory and carnivory. We show that, in contrast to the global pattern, cooperative reproduction is positively associated with both inter-and intra-annual climatic stability. This reversed relationship implies that hornbills are relatively insensitive to climatic fluctuations, perhaps because of their dietary niche or increased body mass, both of which may remove the need for bet-hedging. We conclude that the relationship between climatic variability and cooperative breeding is inconsistent across taxa, and potentially mediated by life-history variation. These findings help to explain the mixed results of previous studies and highlight the likely shortcomings of global datasets inherently biased towards particular categories.
Corrigendum to “A comprehensive molecular phylogeny for the hornbills (Aves: Bucerotidae)” [Mol. Phylogenet. Evol. 67 (2013) 468–483]
Molecular Phylogenetics and Evolution, 2013
A comprehensive molecular phylogeny for the hornbills (Aves: Bucerotidae)
Molecular Phylogenetics and Evolution, 2013
The hornbills comprise a group of morphologically and behaviorally distinct Palaeotropical bird s... more The hornbills comprise a group of morphologically and behaviorally distinct Palaeotropical bird species that feature prominently in studies of ecology and conservation biology. Although the monophyly of hornbills is well established, previous phylogenetic hypotheses were based solely on mtDNA and limited sampling of species diversity. We used parsimony, maximum likelihood and Bayesian methods to reconstruct relationships among all 61 extant hornbill species, based on nuclear and mtDNA gene sequences extracted largely from historical samples. The resulting phylogenetic trees closely match vocal variation across the family but conflict with current taxonomic treatments. In particular, they highlight a new arrangement for the six major clades of hornbills and reveal that three groups traditionally treated as genera (Tockus, Aceros, Penelopides) are non-monophyletic. In addition, two other genera (Anthracoceros, Ocyceros) were non-monophyletic in the mtDNA gene tree. Our findings resolve some longstanding problems in hornbill systematics, including the placement of 'Penelopides exharatus' (embedded in Aceros) and 'Tockus hartlaubi' (sister to Tropicranus albocristatus). We also confirm that an Asiatic lineage (Berenicornis) is sister to a trio of Afrotropical genera (Tropicranus [including 'Tockus hartlaubi'], Ceratogymna, Bycanistes). We present a summary phylogeny as a robust basis for further studies of hornbill ecology, evolution and historical biogeography.
Copeia, 2007
We describe a new species of forest frog (genus Platymantis) from Mt. Malinao, Bicol Peninsula, s... more We describe a new species of forest frog (genus Platymantis) from Mt. Malinao, Bicol Peninsula, southern Luzon Island, The Philippines. The new species is distinguished from congeners by a moderate body size (28.3-39.1 mm for eight males; 49.8-52.7 in two females), slightly expanded terminal finger and toe disks, a distinct color pattern, a unique microhabitat preference, and various spectral and temporal aspects of the advertisement call. The new species is known only from 950-1160 m above sea level on Mt. Malinao and, as such, accentuates this mountain's unrecognized conservation significance as a minor center of herpetological diversity and endemism on southern Luzon. We compare the new species to all presumably related (phenotypically similar) species of Platymantis from the Philippines and comment on apparent trends in morphological evolution and habitat preference in Philippine members of the genus Platymantis. Current understanding of Platymantis species diversity throughout this topographically and geographically complex archipelago is underestimated and in need of comprehensive review.
by Tandora Grant, Maria D R Castañeda, Tiffany Doan, Robert Espinoza, Alejandro Fallabrino, Lee A Fitzgerald, Juan Carlos T. Gonzalez, juan m pleguezuelos, Sabine Vinke, Oliver Wearn, César Aguilar, Gavin Masterson, Truong Nguyen, Nikolai Orlov, Christopher Raxworthy, Riyad Sadek, Yehudah Werner, Thomas Wiewandt, George Zug, Brian Crother, Lutz Dirksen, Amanda Lane, David Milton, Robert Stuebing, and Enrique La Marca Biological Conservation, 2013
Effective conservation action requires knowledge of the distribution of threatened 19 species and... more Effective conservation action requires knowledge of the distribution of threatened 19 species and the threat processes affecting them. We present the first global assessment 20 of extinction risk for a random representative sample of 1,500 reptile species. We find 21 strong variation in extinction risk by taxonomic groups and geographic regions, with 22 the most threatened reptiles associated with freshwater environments, tropical regions, 23 and oceanic islands. Extinction risk is predominantly associated with habitat loss and 24 over-exploitation. Our results emphasize the need for research attention to be focussed 25 on tropical areas, which are seeing the highest extinction risk, and fossorial reptiles, 26 for which there is a chronic lack of data. 27 28
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Papers by Juan Carlos T. Gonzalez