Imperial College London

DrJosephTobias

Faculty of Natural SciencesDepartment of Life Sciences (Silwood Park)

Reader in Biodiversity and Ecosystems
 
 
 
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Contact

 

+44 (0)20 7594 1059j.tobias

 
 
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Location

 

KennedySilwood Park

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Summary

 

Publications

Publication Type
Year
to

87 results found

Santini L, Butchart SHM, Rondinini C, Benítez-López A, Hilbers JP, Schipper A, Cengic M, Tobias JA, Huijbregts MAJet al., 2019, Applying habitat and population-density models to land-cover time series to inform IUCN red list assessments., Conserv Biol

The IUCN Red List categories and criteria are the most widely used framework for assessing the relative extinction risk of species. The criteria are based on quantitative thresholds relating to the size, trends and structure of species' distributions and populations. However, data on these parameters are sparse and uncertain for many species and unavailable for others, potentially leading to their misclassification, or classification as Data Deficient. Here we propose an approach combining data on land-cover change and species-specific habitat preferences, population abundance and dispersal distance to estimate key parameters (extent of occurrence, maximum area of occupancy, population size and trend, and degree of fragmentation) and hence IUCN Red List categories. We demonstrate the applicability of our approach for non-pelagic birds and terrestrial mammals globally (∼15,000 species), generating predictions fairly consistent with published Red List assessments, but more optimistic overall. We predict 4.2% of species (467 birds and 143 mammals) to be more threatened than currently assessed, and 20.2% of Data Deficient species (10 birds and 114 mammals) to be at risk of extinction. However, incorporating the habitat fragmentation sub-criterion reduced these predictions 1.5-2.3% and 6.4-14.9% (depending on the quantitative definition of fragmentation) of threatened and Data Deficient species respectively, highlighting the need for improved guidance to Red List assessors on applying this aspect of the Red List criteria. Our approach can be used to complement traditional methods of estimating parameters for Red List assessments. Furthermore, it can readily provide an early warning system to identify species potentially warranting changes in their extinction risk category based on periodic updates of land cover information. Given that our method relies on optimistic assumptions about species distribution and abundance, all species predicted to be more at risk than cu

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Cooney CR, MacGregor HEA, Seddon N, Tobias JAet al., 2018, Multi-modal signal evolution in birds: re-examining a standard proxy for sexual selection, PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES, Vol: 285, ISSN: 0962-8452

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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, Vol: 127, Pages: 1233-1242, ISSN: 0030-1299

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McEntee JP, Tobias JA, Sheard C, Burleigh JGet al., 2018, Tempo and timing of ecological trait divergence in bird speciation, NATURE ECOLOGY & EVOLUTION, Vol: 2, Pages: 1120-+, ISSN: 2397-334X

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Pigot AL, Jetz W, Sheard C, Tobias JAet al., 2018, The macroecological dynamics of species coexistence in birds, NATURE ECOLOGY & EVOLUTION, Vol: 2, Pages: 1112-+, ISSN: 2397-334X

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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.

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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

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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

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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

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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.

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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

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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

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Tobias JA, Sheard C, Seddon N, Meade A, Cotton AJ, Nakagawa Set al., 2016, Territoriality, Social Bonds, and the Evolution of Communal Signaling in Birds, FRONTIERS IN ECOLOGY AND EVOLUTION, Vol: 4, ISSN: 2296-701X

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