Imperial College London

DrJosephTobias

Faculty of Natural SciencesDepartment of Life Sciences (Silwood Park)

Senior Lecturer in Biodiversity
 
 
 
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Contact

 

+44 (0)20 7594 1059j.tobias CV

 
 
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Location

 

KennedySilwood Park

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Summary

 

Publications

Publication Type
Year
to

85 results found

Bovo AAA, Ferraz KMPMB, Magioli M, Alexandrino ER, Hasui E, Ribeiro MC, Tobias JAet al., 2018, Habitat fragmentation narrows the distribution of avian functional traits associated with seed dispersal in tropical forest, PERSPECTIVES IN ECOLOGY AND CONSERVATION, Vol: 16, Pages: 90-96, ISSN: 2530-0644

JOURNAL ARTICLE

Chapman PM, Tobias JA, Edwards DP, Davies RGet al., 2018, Contrasting impacts of land-use change on phylogenetic and functional diversity of tropical forest birds, JOURNAL OF APPLIED ECOLOGY, Vol: 55, Pages: 1604-1614, ISSN: 0021-8901

JOURNAL ARTICLE

Derryberry EP, Seddon N, Derryberry GE, Claramunt S, Seeholzer GF, Brumfield RT, Tobias JAet al., 2018, Ecological drivers of song evolution in birds: Disentangling the effects of habitat and morphology, ECOLOGY AND EVOLUTION, Vol: 8, Pages: 1890-1905, ISSN: 2045-7758

JOURNAL ARTICLE

Drury JP, Tobias JA, Burns KJ, Mason NA, Shultz AJ, Morlon Het al., 2018, Contrasting impacts of competition on ecological and social trait evolution in songbirds, PLOS BIOLOGY, Vol: 16, ISSN: 1545-7885

JOURNAL ARTICLE

Fecchio A, Bell JA, Collins MD, Farias IP, Trisos CH, Tobias JA, Tkach VV, Weckstein JD, Ricklefs RE, Batalha-Filho Het al., 2018, Diversification by host switching and dispersal shaped the diversity and distribution of avian malaria parasites in Amazonia, Oikos, ISSN: 0030-1299

© 2018 Nordic Society Oikos. Understanding how pathogens and parasites diversify through time and space is fundamental to predicting emerging infectious diseases. Here, we use biogeographic, coevolutionary and phylogenetic analyses to describe the origin, diversity, and distribution of avian malaria parasites in the most diverse avifauna on Earth. We first performed phylogenetic analyses using the mitochondrial cytochrome b (cyt b) gene to determine relationships among parasite lineages. Then, we estimated divergence times and reconstructed ancestral areas to uncover how landscape evolution has shaped the diversification of Parahaemoproteus and Plasmodium in Amazonia. Finally, we assessed the coevolutionary patterns of diversification in this host-parasite system to determine how coevolution may have influenced the contemporary diversity of avian malaria parasites and their distribution among Amazonian birds. Biogeographic analysis of 324 haemosporidian parasite lineages recovered from 4178 individual birds provided strong evidence that these parasites readily disperse across major Amazonian rivers and this has occurred with increasing frequency over the last five million years. We also recovered many duplication events within areas of endemism in Amazonia. Cophylogenetic analyses of these blood parasites and their avian hosts support a diversification history dominated by host switching. The ability of avian malaria parasites to disperse geographically and shift among avian hosts has played a major role in their radiation and has shaped the current distribution and diversity of these parasites across Amazonia.

JOURNAL ARTICLE

Hatfield JH, Orme CDL, Tobias JA, Banks-Leite Cet al., 2018, Trait-based indicators of bird species sensitivity to habitat loss are effective within but not across data sets, ECOLOGICAL APPLICATIONS, Vol: 28, Pages: 28-34, ISSN: 1051-0761

JOURNAL ARTICLE

Howard C, Stephens PA, Tobias JA, Sheard C, Butchart SHM, Willis SGet al., 2018, Flight range, fuel load and the impact of climate change on the journeys of migrant birds, PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES, Vol: 285, ISSN: 0962-8452

JOURNAL ARTICLE

McEntee JP, Tobias JA, Sheard C, Burleigh JGet al., 2018, Tempo and timing of ecological trait divergence in bird speciation., Nat Ecol Evol, Vol: 2, Pages: 1120-1127

Organismal traits may evolve either gradually or in rapid pulses, but the relative importance of these modes in the generation of species differences is unclear. Additionally, while pulsed evolution is frequently assumed to be associated with speciation events, few studies have explicitly examined how the tempo of trait divergence varies with respect to different geographical phases of speciation, starting with geographic isolation and ending, in many cases, with spatial overlap (sympatry). Here we address these issues by combining divergence time estimates, trait measurements and geographic range data for 952 avian sister species pairs worldwide to examine the tempo and timing of trait divergence in recent speciation events. We show that patterns of divergence in key ecological traits are not gradual, but instead seem to follow a pattern of relative stasis interspersed with evolutionary pulses of varying magnitude. We also find evidence that evolutionary pulses generally precede sympatry, and that greater trait disparity is associated with sympatry. These findings suggest that early pulses of trait divergence promote subsequent transitions to sympatry, rather than occurring after sympatry has been established. Incorporating models with evolutionary pulses of varying magnitude into speciation theory may explain why some species pairs achieve rapid sympatry whereas others undergo prolonged geographical exclusion.

JOURNAL ARTICLE

Pigot AL, Jetz W, Sheard C, Tobias JAet al., 2018, The macroecological dynamics of species coexistence in birds., Nat Ecol Evol, Vol: 2, Pages: 1112-1119

Ecological communities are assembled from the overlapping of species in geographic space, but the mechanisms facilitating or limiting such overlaps are difficult to resolve. Here, we combine phylogenetic, morphological and environmental data to model how multiple processes regulate the origin and maintenance of geographic range overlap across 1,115 pairs of avian sister species globally. We show that coexistence cannot be adequately predicted by either dispersal-assembly (that is, biogeographic) models or niche-assembly models alone. Instead, our results overwhelmingly support an integrated model with different assembly processes dominating at different stages of coexistence. The initial attainment of narrow geographic overlap is dictated by intrinsic dispersal ability and the time available for dispersal, whereas wider coexistence is largely dependent on niche availability, increasing with ecosystem productivity and divergence in niche-related traits, and apparently declining as communities become saturated with species. Furthermore, although coexistence of any individual pair of species is highly stochastic, we find that integrating assembly processes allows broad variation in the incidence and extent of coexistence to be predicted with reasonable accuracy. Our findings demonstrate how phylogenetic data coupled with environmental factors and functional traits can begin to clarify the multi-layered processes shaping the distribution of biodiversity at large spatial scales.

JOURNAL ARTICLE

Ulrich W, Banks-Leite C, De Coster G, Habel JC, Matheve H, Newmark WD, Tobias JA, Lens Let al., 2018, Environmentally and behaviourally mediated co-occurrence of functional traits in bird communities of tropical forest fragments, OIKOS, Vol: 127, Pages: 274-284, ISSN: 0030-1299

JOURNAL ARTICLE

Bath E, Bowden S, Peters C, Reddy A, Tobias JA, Easton-Calabria E, Seddon N, Goodwin SF, Wigby Set al., 2017, Sperm and sex peptide stimulate aggression in female &ITDrosophila&IT, NATURE ECOLOGY & EVOLUTION, Vol: 1, ISSN: 2397-334X

JOURNAL ARTICLE

Cooney CR, Tobias JA, Weir JT, Botero CA, Seddon Net al., 2017, Sexual selection, speciation and constraints on geographical range overlap in birds, ECOLOGY LETTERS, Vol: 20, Pages: 863-871, ISSN: 1461-023X

JOURNAL ARTICLE

Fecchio A, Svensson-Coelho M, Bell J, Ellis VA, Medeiros MC, Trisos CH, Blake JG, Loiselle BA, Tobias JA, Fanti R, Coffey ED, De Faria IP, Pinho JB, Felix G, Braga EM, Anciaes M, Tkach V, Bates J, Witt C, Weckstein JD, Ricklefs RE, Farias IPet al., 2017, Host associations and turnover of haemosporidian parasites in manakins (Aves: Pipridae), PARASITOLOGY, Vol: 144, Pages: 984-993, ISSN: 0031-1820

JOURNAL ARTICLE

Grether GF, Peiman KS, Tobias JA, Robinson BWet al., 2017, Causes and Consequences of Behavioral Interference between Species, TRENDS IN ECOLOGY & EVOLUTION, Vol: 32, Pages: 760-772, ISSN: 0169-5347

JOURNAL ARTICLE

Hosner PA, Tobias JA, Braun EL, Kimball RTet al., 2017, How do seemingly non-vagile clades accomplish trans-marine dispersal? Trait and dispersal evolution in the landfowl (Ayes: Galliformes), PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES, Vol: 284, ISSN: 0962-8452

JOURNAL ARTICLE

Mason NA, Burns KJ, Tobias JA, Claramunt S, Seddon N, Derryberry EPet al., 2017, Song evolution, speciation, and vocal learning in passerine birds, EVOLUTION, Vol: 71, Pages: 786-796, ISSN: 0014-3820

JOURNAL ARTICLE

Stoddard MC, Yong EH, Akkaynak D, Sheard C, Tobias JA, Mahadevan Let al., 2017, Avian egg shape: Form, function, and evolution, SCIENCE, Vol: 356, Pages: 1249-+, ISSN: 0036-8075

JOURNAL ARTICLE

Thaxter CB, Buchanan GM, Carr J, Butchart SHM, Newbold T, Green RE, Tobias JA, Foden WB, O'Brien S, Pearce-Higgins JWet al., 2017, Bird and bat species' global vulnerability to collision mortality at wind farms revealed through a trait-based assessment, PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES, Vol: 284, ISSN: 0962-8452

JOURNAL ARTICLE

Waldron A, Miller DC, Redding D, Mooers A, Kuhn TS, Nibbelink N, Roberts JT, Tobias JA, Gittleman JLet al., 2017, Reductions in global biodiversity loss predicted from conservation spending, NATURE, Vol: 551, Pages: 364-+, ISSN: 0028-0836

JOURNAL ARTICLE

Bregman TP, Lees AC, MacGregor HEA, Darski B, de Moura NG, Aleixo A, Barlow J, Tobias JAet al., 2016, Using avian functional traits to assess the impact of land-cover change on ecosystem processes linked to resilience in tropical forests, PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES, Vol: 283, ISSN: 0962-8452

JOURNAL ARTICLE

Bregman TP, Lees AC, MacGregor HEA, Darski B, de Moura NG, Aleixo A, Barlow J, Tobias JAet al., 2016, Using avian functional traits to assess the impact of land-cover change on ecosystem processes linked to resilience in tropical forests, Proceedings. Biological sciences, Vol: 283

© 2016 The Author(s). Vertebrates perform key roles in ecosystem processes via trophic interactions with plants and insects, but the response of these interactions to environmental change is difficult to quantify in complex systems, such as tropical forests. Here, we use the functional trait structure of Amazonian forest bird assemblages to explore the impacts of land-cover change on two ecosystem processes: seed dispersal and insect predation. We show that trait structure in assemblages of frugivorous and insectivorous birds remained stable after primary forests were subjected to logging and fire events, but that further intensification of human land use substantially reduced the functional diversity and dispersion of traits, and resulted in communities that occupied a different region of trait space. These effects were only partially reversed in regenerating secondary forests. Our findings suggest that local extinctions caused by the loss and degradation of tropical forest are non-random with respect to functional traits, thus disrupting the network of trophic interactions regulating seed dispersal by forest birds and herbivory by insects, with important implications for the structure and resilience of human-modified tropical forests. Furthermore, our results illustrate how quantitative functional traits for specific guilds can provide a range of metrics for estimating the contribution of biodiversity to ecosystem processes, and the response of such processes to land-cover change.

JOURNAL ARTICLE

Collar NJ, Fishpool LDC, del Hoyo J, Pilgrim JD, Seddon N, Spottiswoode CN, Tobias JAet al., 2016, Toward a scoring system for species delimitation: a response to Remsen, JOURNAL OF FIELD ORNITHOLOGY, Vol: 87, Pages: 104-110, ISSN: 0273-8570

JOURNAL ARTICLE

Cooney CR, Seddon N, Tobias JA, 2016, Widespread correlations between climatic niche evolution and species diversification in birds, JOURNAL OF ANIMAL ECOLOGY, Vol: 85, Pages: 869-878, ISSN: 0021-8790

JOURNAL ARTICLE

Pigot AL, Bregman T, Sheard C, Daly B, Etienne RS, Tobias JAet al., 2016, Quantifying species contributions to ecosystem processes: a global assessment of functional trait and phylogenetic metrics across avian seed-dispersal networks, PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES, Vol: 283, ISSN: 0962-8452

JOURNAL ARTICLE

Pigot AL, Tobias JA, Jetz W, 2016, Energetic Constraints on Species Coexistence in Birds, PLoS Biology, Vol: 14, ISSN: 1544-9173

© 2016 Pigot et al. The association between species richness and ecosystem energy availability is one of the major geographic trends in biodiversity. It is often explained in terms of energetic constraints, such that coexistence among competing species is limited in low productivity environments. However, it has proven challenging to reject alternative views, including the null hypothesis that species richness has simply had more time to accumulate in productive regions, and thus the role of energetic constraints in limiting coexistence remains largely unknown. We use the phylogenetic relationships and geographic ranges of sister species (pairs of lineages who are each other’s closest extant relatives) to examine the association between energy availability and coexistence across an entire vertebrate class (Aves). We show that the incidence of coexistence among sister species increases with overall species richness and is elevated in more productive ecosystems, even when accounting for differences in the evolutionary time available for coexistence to occur. Our results indicate that energy availability promotes species coexistence in closely related lineages, providing a key step toward a more mechanistic understanding of the productivity–richness relationship underlying global gradients in biodiversity.

JOURNAL ARTICLE

Pigot AL, Trisos CH, Tobias JA, 2016, Functional traits reveal the expansion and packing of ecological niche space underlying an elevational diversity gradient in passerine birds, PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES, Vol: 283, ISSN: 0962-8452

JOURNAL ARTICLE

Seddon N, Mace GM, Naeem S, Tobias JA, Pigot AL, Cavanagh R, Mouillot D, Vause J, Walpole Met al., 2016, Biodiversity in the Anthropocene: prospects and policy, PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES, Vol: 283, ISSN: 0962-8452

JOURNAL ARTICLE

Ulrich W, Lens L, Tobias JA, Habel JCet al., 2016, Contrasting Patterns of Species Richness and Functional Diversity in Bird Communities of East African Cloud Forest Fragments, PLOS ONE, Vol: 11, ISSN: 1932-6203

JOURNAL ARTICLE

Bath E, Wigby S, Vincent C, Tobias JA, Seddon Net al., 2015, Condition, not eyespan, predicts contest outcome in female stalk-eyed flies, Teleopsis dalmanni, ECOLOGY AND EVOLUTION, Vol: 5, Pages: 1826-1836, ISSN: 2045-7758

JOURNAL ARTICLE

Bregman TP, Lees AC, Seddon N, MacGregor HEA, Darski B, Aleixo A, Bonsall MB, Tobias JAet al., 2015, Species interactions regulate the collapse of biodiversity and ecosystem function in tropical forest fragments, ECOLOGY, Vol: 96, Pages: 2692-2704, ISSN: 0012-9658

JOURNAL ARTICLE

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