81 results found
Chapman PM, Tobias JA, Edwards DP, et al., 2018, Contrasting impacts of land-use change on phylogenetic and functional diversity of tropical forest birds, Journal of Applied Ecology, ISSN: 0021-8901
© 2018 British Ecological Society. Biodiversity conservation strategies increasingly target maintaining evolutionary history and the resilience of ecosystem function, not just species richness (SR). This has led to the emergence of two metrics commonly proposed as tools for decision making: phylogenetic diversity (PD) and functional diversity (FD). Yet, the extent to which they are interchangeable remains poorly understood. We explore shifts in and relationships between FD and PD of bird communities across a disturbance gradient in Borneo, from old-growth tropical forest to oil palm plantation. We show a marked decline in PD, and an increase in phylogenetic mean nearest taxon distance from forest to oil palm, in line with declining SR across the gradient. However, phylogenetic mean pairwise distance is constrained by forest logging more than by conversion to oil palm, taking account of SR. The decline in FD across the gradient is less severe than in PD, with all metrics indicating relatively high trait diversity in oil palm despite low SR, although functional redundancy is much reduced. Accounting for SR, levels of functional over- or under-dispersion of bird communities are strongly coupled to habitat disturbance level rather than to any equivalent phylogenetic metric. Policy implications. We suggest that while phylogenetic diversity (PD) is an improvement on species richness as a proxy for functional diversity (FD), conservation decisions based on phylogenetic diversity alone cannot reliably safeguard maximal functional diversity. Thus, phylogenetic diversity and functional diversity are related but still complementary. Priority setting exercises should use these metrics in combination to identify conservation targets.
Derryberry EP, Seddon N, Derryberry GE, et 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
Drury JP, Tobias JA, Burns KJ, et al., 2018, Contrasting impacts of competition on ecological and social trait evolution in songbirds, PLOS BIOLOGY, Vol: 16, ISSN: 1545-7885
Hatfield JH, Orme CDL, Tobias JA, et al., 2018, Trait-based indicators of bird species sensitivity to habitat loss are effective within but not across data sets., Ecol Appl, Vol: 28, Pages: 28-34, 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 data sets 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 four to nine variables showed high explanatory power within a single study or data set, but none performed as strong predictors across all data sets. 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.
Howard C, Stephens PA, Tobias JA, et al., 2018, Flight range, fuel load and the impact of climate change on the journeys of migrant birds., Proc Biol Sci, Vol: 285
Climate change is predicted to increase migration distances for many migratory species, but the physiological and temporal implications of longer migratory journeys have not been explored. Here, we combine information about species' flight range potential and migratory refuelling requirements to simulate the number of stopovers required and the duration of current migratory journeys for 77 bird species breeding in Europe. Using tracking data, we show that our estimates accord with recorded journey times and stopovers for most species. We then combine projections of altered migratory distances under climate change with models of avian flight to predict future migratory journeys. We find that 37% of migratory journeys undertaken by long-distance migrants will necessitate an additional stopover in future. These greater distances and the increased number of stops will substantially increase overall journey durations of many long-distance migratory species, a factor not currently considered in climate impact studies.
Ulrich W, Banks-Leite C, De Coster G, et 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
Bath E, Bowden S, Peters C, et al., 2017, Sperm and sex peptide stimulate aggression in female &ITDrosophila&IT, NATURE ECOLOGY & EVOLUTION, Vol: 1, ISSN: 2397-334X
Cooney CR, Tobias JA, Weir JT, et al., 2017, Sexual selection, speciation and constraints on geographical range overlap in birds, ECOLOGY LETTERS, Vol: 20, Pages: 863-871, ISSN: 1461-023X
Fecchio A, Svensson-Coelho M, Bell J, et al., 2017, Host associations and turnover of haemosporidian parasites in manakins (Aves: Pipridae), PARASITOLOGY, Vol: 144, Pages: 984-993, ISSN: 0031-1820
Grether GF, Peiman KS, Tobias JA, et al., 2017, Causes and Consequences of Behavioral Interference between Species, TRENDS IN ECOLOGY & EVOLUTION, Vol: 32, Pages: 760-772, ISSN: 0169-5347
Hosner PA, Tobias JA, Braun EL, et 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
Mason NA, Burns KJ, Tobias JA, et al., 2017, Song evolution, speciation, and vocal learning in passerine birds, EVOLUTION, Vol: 71, Pages: 786-796, ISSN: 0014-3820
Thaxter CB, Buchanan GM, Carr J, et 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
Waldron A, Miller DC, Redding D, et al., 2017, Reductions in global biodiversity loss predicted from conservation spending, NATURE, Vol: 551, Pages: 364-+, ISSN: 0028-0836
Bregman TP, Lees AC, MacGregor HEA, et 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
Bregman TP, Lees AC, MacGregor HEA, et 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.
Collar NJ, Fishpool LDC, del Hoyo J, et 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
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
Pigot AL, Bregman T, Sheard C, et 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
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.
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
Seddon N, Mace GM, Naeem S, et al., 2016, Biodiversity in the Anthropocene: prospects and policy, PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES, Vol: 283, ISSN: 0962-8452
Ulrich W, Lens L, Tobias JA, et 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
Bath E, Wigby S, Vincent C, et 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
Bregman TP, Lees AC, Seddon N, et 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
Matthews TJ, Sheard C, -Jones HEWC, et 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
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
Tobias JA, 2015, BIODIVERSITY Hidden impacts of logging, NATURE, Vol: 523, Pages: 163-164, ISSN: 0028-0836
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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