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
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77 results found

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 Drosophila., Nat Ecol Evol, Vol: 1, ISSN: 2397-334X

Female aggression towards other females is associated with reproduction in many taxa, and traditionally thought to be related to the protection or provisioning of offspring, such as through increased resource acquisition. However, the underlying reproductive factors causing aggressive behaviour in females remain unknown. Here we show that female aggression in the fruit fly Drosophila melanogaster is strongly stimulated by the receipt of sperm at mating, and in part by an associated seminal fluid protein, the sex peptide. We further show that the post-mating increase in female aggression is decoupled from the costs of egg production and from post-mating decreases in sexual receptivity. Our results suggest that male ejaculates can have a surprisingly direct influence on aggression in recipient females. Male ejaculate traits thus influence the female social competitive environment with potentially far-reaching ecological and evolutionary consequences.

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

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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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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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Hatfield JH, Orme CDL, Tobias JA, Banks-Leite Cet al., 2017, Trait-based indicators of bird species sensitivity to habitat loss are effective within but not across datasets., Ecol Appl, ISSN: 1051-0761

Species' traits have been widely championed as the key to predicting which species are most threatened by habitat loss, yet previous work has failed to detect trends that are consistent enough to guide large-scale conservation and management. Here we explore whether traits and environmental variables predict species sensitivity to habitat loss across two datasets generated by independent avifaunal studies in the Atlantic Forest of Brazil, both of which detected a similar assemblage of species, and similar species-specific responses to habitat change, across an overlapping sample of sites. Specifically, we tested whether 25 distributional, climatic, ecological, behavioral and morphological variables predict sensitivity to habitat loss among 196 bird species, both within and across studies, and when data were analysed as occurrence or abundance. We found that 4-9 variables showed high explanatory power within a single study or dataset, but none performed as strong predictors across all datasets. Our results demonstrate that the use of species traits to predict sensitivity to anthropogenic habitat loss can produce predictions that are species- and site-specific and not scalable to whole regions or biomes, and thus should be used with caution. This article is protected by copyright. All rights reserved.

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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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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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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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Ulrich W, Banks-Leite C, De Coster G, Habel JC, Matheve H, Newmark WD, Tobias JA, Lens Let al., 2017, Environmentally and behaviourally mediated co-occurrence of functional traits in bird communities of tropical forest fragments, Oikos, ISSN: 0030-1299

© 2017 Nordic Society Oikos. Two major theories of community assembly - based on the assumption of 'limiting similarity' or 'habitat filtering', respectively - predict contrasting patterns in the spatial arrangement of functional traits. Previous analyses have made progress in testing these predictions and identifying underlying processes, but have also pointed to theoretical as well as methodological shortcomings. Here we applied a recently developed methodology for spatially explicit analysis of phylogenetic meta-community structure to study the pattern of co-occurrence of functional traits in Afrotropical and Neotropical bird species inhabiting forest fragments. Focusing separately on locomotory, dietary, and dispersal traits, we tested whether environmental filtering causes spatial clustering, or competition leads to spatial segregation as predicted by limiting similarity theory. We detected significant segregation of species co-occurrences in African fragments, but not in the Neotropical ones. Interspecific competition had a higher impact on trait co-occurrence than filter effects, yet no single functional trait was able to explain the observed degree of spatial segregation among species. Despite high regional variability spanning from spatial segregation to aggregation, we found a consistent tendency for a clustered spatial patterning of functional traits among communities in fragmented landscapes, particularly in non-territorial species. Overall, we show that behavioural effects, such as territoriality, and environmental effects, such as the area of forest remnants or properties of the landscape matrix in which they are embedded, can strongly affect the pattern of trait co-occurrence. Our findings suggest that trait-based analyses of community structure should include behavioural and environmental covariates, and we here provide an appropriate method for linking functional traits, species ecology and environmental conditions to clarify the drivers underl

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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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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

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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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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, 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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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

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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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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

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Matthews TJ, Sheard C, -Jones HEWC, Bregman TP, Tobias JA, Whittaker RJet al., 2015, Ecological traits reveal functional nestedness of bird communities in habitat islands: a global survey, OIKOS, Vol: 124, Pages: 817-826, ISSN: 0030-1299

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Pigot AL, Tobias JA, 2015, Dispersal and the transition to sympatry in vertebrates, PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES, Vol: 282, ISSN: 0962-8452

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Tobias JA, 2015, BIODIVERSITY Hidden impacts of logging, NATURE, Vol: 523, Pages: 163-164, ISSN: 0028-0836

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Bregman TP, Sekercioglu CH, Tobias JA, 2014, Global patterns and predictors of bird species responses to forest fragmentation: Implications for ecosystem function and conservation, BIOLOGICAL CONSERVATION, Vol: 169, Pages: 372-383, ISSN: 0006-3207

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Edwards DP, Tobias JA, Sheil D, Meijaard E, Laurance WFet al., 2014, Maintaining ecosystem function and services in logged tropical forests, TRENDS IN ECOLOGY & EVOLUTION, Vol: 29, Pages: 511-520, ISSN: 0169-5347

JOURNAL ARTICLE

Fayet AL, Tobias JA, Hintzen RE, Seddon Net al., 2014, Immigration and dispersal are key determinants of cultural diversity in a songbird population, BEHAVIORAL ECOLOGY, Vol: 25, Pages: 744-753, ISSN: 1045-2249

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Tobias JA, Cornwallis CK, Derryberry EP, Claramunt S, Brumfield RT, Seddon Net al., 2014, Species coexistence and the dynamics of phenotypic evolution in adaptive radiation, NATURE, Vol: 506, Pages: 359-+, ISSN: 0028-0836

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Tobias JA, Planque R, Cram DL, Seddon Net al., 2014, Species interactions and the structure of complex communication networks, PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, Vol: 111, Pages: 1020-1025, ISSN: 0027-8424

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Touchton JM, Seddon N, Tobias JA, 2014, Captive Rearing Experiments Confirm Song Development without Learning in a Tracheophone Suboscine Bird, PLOS ONE, Vol: 9, ISSN: 1932-6203

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