Biodiversity and biogeographyTropical ecology and conservationEcological techniques and analysis
I am Professor of Conservation Ecology within the Conservation, Evolution and Behaviour Research Group. I have a special focus on tropical wildlife and a long history of studying parrots and other birds. I work with several PhD students and other researchers both from EU and overseas.
Impact of habitat alteration on wildlifeBird ecology and conservationEcological survey methods
NAD. Mallari, NJ. Collar, PJK. McGowan, SJ. Marsden (2016). Philippine protected areas are not meeting the biodiversity coverage and management effectiveness requirements of Aichi Target 11. Ambio. 45(3), pp.313-322.
M. Geary, AH. Fielding, PJK. McGowan, SJ. Marsden (2015). Scenario-led habitat modelling of land use change impacts on key species. PLoS ONE. 10(11),
M. Menegon, SP. Loader, SJ. Marsden, WR. Branch, TRB. Davenport, et al. S. Ursenbacher. (2014). The genus Atheris (Serpentes: Viperidae) in East Africa: phylogeny and the role of rifting and climate in shaping the current pattern of species diversity. Mol Phylogenet Evol. 79(1), pp.12-22.
EI. Grimwood, JK. Menner, SJ. Marsden (2024). Comparisons of songbirds on sale across online and physical markets in Indonesia. Biodiversity and Conservation.
C. Devenish, AR. Junaid, . Andriansyah, R. Saryanthi, SB. van Balen, et al. F. Kaprawi, GC. Aprianto, RC. Stanley, O. Poole, A. Owen, NJ. Collar, SJ. Marsden. (2022). Biological richness of Gunung Slamet, Central Java, and the need for its protection—CORRIGENDUM. Oryx. 56(3), pp.477-477.
S. Valle, NJ. Collar, B. Barca, P. Dauda, SJ. Marsden (2020). Low abundance of the Endangered timneh parrot Psittacus timneh in one of its presumed strongholds. Oryx. 54(1), pp.74-76.
DC. Alder, RJ. Fuller, SJ. Marsden (2018). Implications of transformation to irregular silviculture for woodland birds: A stand wise comparison in an English broadleaf woodland. Forest Ecology and Management. 422, pp.69-78.
A. Reuleaux, NJ. Collar, BA. Siregar, A. Mardiastuti, SJ. Marsden (2018). Preliminary range-wide surveys of the heavily traded Tenggara Hill Myna Gracula venerata. FORKTAIL. 2018(34), pp.29-34.
ATK. Lee, SJ. Marsden, E. Tatum-Hume, DJ. Brightsmith (2017). The effects of tourist and boat traffic on parrot geophagy in lowland Peru. Biotropica. 49(5), pp.716-725.
SJ. Marsden, C. Devenish, G. Buchanan, G. Smith (2017). Extreme and complex variation in range-wide abundances across a threatened Neotropical bird community. Diversity and Distributions. 23(8), pp.910-921.
S. Valle, NJ. Collar, WE. Harris, SJ. Marsden (2017). Spatial and seasonal variation in abundance within an insular grey parrot population. African Journal of Ecology.
SJ. Marsden, E. Loqueh, JM. Takuo, JA. Hart, R. Abani, et al. DB. Ahon, NND. Annorbah, R. Johnson, S. Valle. (2016). Using encounter rates as surrogates for density estimates makes monitoring of heavily-traded grey parrots achievable across Africa. Oryx. 50(4), pp.617-625.
S. Ghielmi, M. Menegon, SJ. Marsden, L. Laddaga, S. Ursenbacher (2016). A new vertebrate for Europe: the discovery of a range-restricted relict viper in the western Italian Alps. Journal of Zoological Systematics and Evolutionary Research. 54(3), pp.161-173.
NAD. Mallari, NJ. Collar, PJK. McGowan, SJ. Marsden (2016). Philippine protected areas are not meeting the biodiversity coverage and management effectiveness requirements of Aichi Target 11. Ambio. 45(3), pp.313-322.
NND. Annorbah, NJ. Collar, SJ. Marsden (2016). Trade and habitat change virtually eliminate the
M. Geary, AH. Fielding, PJK. McGowan, SJ. Marsden (2015). Scenario-led habitat modelling of land use change impacts on key species. PLoS ONE. 10(11),
M. Geary, AH. Fielding, SJ. Marsden (2015). Both habitat change and local lek structure influence patterns of spatial loss and recovery in a black grouse population. Population Ecology. 57(2), pp.421-431.
SJ. Marsden, K. Royle (2015). Abundance and abundance change in the world's parrots. Ibis. 157(2), pp.219-229.
M. Menegon, SP. Loader, SJ. Marsden, WR. Branch, TRB. Davenport, et al. S. Ursenbacher. (2014). The genus Atheris (Serpentes: Viperidae) in East Africa: phylogeny and the role of rifting and climate in shaping the current pattern of species diversity. Mol Phylogenet Evol. 79(1), pp.12-22.
ATK. Lee, DJ. Brightsmith, MP. Vargas, KQ. Leon, AJ. Mejia, et al. SJ. Marsden. (2014). Diet and Geophagy Across a Western Amazonian Parrot Assemblage. Biotropica. 46(3), pp.322-330.
RP. Piana, SJ. Marsden (2014). Impacts of cattle grazing on forest structure and raptor distribution within a neotropical protected area. Biodiversity and Conservation. 23(3), pp.559-572.
RP. Piana, SJ. Marsden (2014). Impacts of cattle grazing on forest structure and raptor distribution within a neotropical protected area. Biodiversity and Conservation. pp.1-14.
NJ. Collar, SJ. Marsden (2014). The subspecies of Yellow-crested Cockatoo Cacatua sulphurea. FORKTAIL. pp.23-27.
CE. Bracebridge, TRB. Davenport, VF. Mbofu, SJ. Marsden (2013). Is There a Role for Human-Dominated Landscapes in the Long-Term Conservation Management of the Critically Endangered Kipunji (Rungwecebus kipunji)?. International Journal of Primatology. 34(6), pp.1122-1136.
CP. Española, NJ. Collar, SJ. Marsden (2013). Are populations of large-bodied avian frugivores on Luzon, Philippines, facing imminent collapse?. Animal Conservation. 16(4), pp.467-479.
NAD. Mallari, NJ. Collar, PJK. McGowan, SJ. Marsden (2013). Science-driven management of protected areas: A philippine case study. Environmental Management. 51(6), pp.1236-1246.
NAD. Mallari, NJ. Collar, PJK. McGowan, SJ. Marsden (2013). Science-Driven Management of Protected Areas: A Philippine Case Study. Environmental Management. pp.1-11.
M. Geary, AH. Fielding, SJ. Marsden (2013). Designing mosaic landscapes for Black Grouse Tetrao tetrix using multi-scaled models. Ibis. 155(4), pp.792-803.
CP. Española, NJ. Collar, SJ. Marsden (2013). Are populations of large-bodied avian frugivores on Luzon, Philippines, facing imminent collapse?. Animal Conservation.
ATK. Lee, SJ. Marsden (2012). The Influence of Habitat, Season, and Detectability on Abundance Estimates across an Amazonian Parrot Assemblage. Biotropica. 44(4), pp.537-544.
CE. Bracebridge, TR. Davenport, SJ. Marsden (2012). The Impact of Forest Disturbance on the Seasonal Foraging Ecology of a Critically Endangered African Primate. Biotropica. 44(4), pp.560-568.
H. Lloyd, S. Sevillano Ríos, SJ. Marsden, A. Valdés-Velásquez (2012). Bird community composition across an Andean tree-line ecotone. Austral Ecology. 37(4), pp.470-478.
RP. Piana, SJ. Marsden (2012). DIVERSITY, COMMUNITY STRUCTURE, AND NICHE CHARACTERISTICS WITHIN A DIURNAL RAPTOR ASSEMBLAGE OF NORTHWESTERN PERU. CONDOR. 114(2), pp.279-289.
M. Geary, AH. Fielding, SJ. Marsden (2012). The anatomy of population change in a black grouse population 1992-2008. Oecologia. 168(1), pp.73-81.
CE. Bracebridge, TRB. Davenport, SJ. Marsden (2011). Can we extend the area of occupancy of the kipunji, a critically endangered African primate?. Animal Conservation. 14(6), pp.687-696.
NAD. Mallari, NJ. Collar, DC. Lee, PJK. McGowan, R. Wilkinson, et al. SJ. Marsden. (2011). Population densities of understorey birds across a habitat gradient in Palawan, Philippines: Implications for conservation. ORYX. 45(2), pp.234-242.
H. Lloyd, SJ. Marsden (2011). Between-Patch Bird Movements within a High-Andean Polylepis Woodland/Matrix Landscape: Implications for Habitat Restoration. Restoration Ecology. 19(1), pp.74-82.
ATK. Lee, S. Kumar, DJ. Brightsmith, SJ. Marsden (2010). Parrot claylick distribution in South America: do patterns of "where" help answer the question "why"?. Ecography. 33(3), pp.503-513.
D. Alder, S. Marsden (2010). Characteristics of feeding-site selection by breeding Green Woodpeckers Picus viridis in a UK agricultural landscape. BIRD STUDY. 57(1), pp.100-107.
H. Lloyd, SJ. Marsden (2008). Bird community variation across Polylepis woodland fragments and matrix habitats: Implications for biodiversity conservation within a high Andean landscape. Biodiversity and Conservation. 17(11), pp.2645-2660.
TM. Brooks, NJ. Collar, RE. Green, SJ. Marsden, DJ. Pain (2008). The science of bird conservation. BIRD CONSERVATION INTERNATIONAL. 18, pp.S2-S12.
DC. Lee, SJ. Marsden (2008). Increasing the value of bird-habitat studies in tropical forests: choice of approach and habitat measures. BIRD CONSERVATION INTERNATIONAL. 18, pp.S109-S124.
ST. Buckland, SJ. Marsden, RE. Green (2008). Estimating bird abundance: making methods work. BIRD CONSERVATION INTERNATIONAL. 18, pp.S91-S108.
SJ. Marsden, CT. Symes (2008). Bird richness and composition along an agricultural gradient in New Guinea: The influence of land use, habitat heterogeneity and proximity to intact forest. Austral Ecology. 33(6), pp.784-793.
BR. Scales, SJ. Marsden (2008). Biodiversity in small-scale tropical agroforests: A review of species richness and abundance shifts and the factors influencing them. Environmental Conservation. 35(2), pp.160-172.
DC. Lee, SJ. Marsden (2008). Adjusting count period strategies to improve the accuracy of forest bird abundance estimates from point transect distance sampling surveys. Ibis. 150(2), pp.315-325.
CT. Symes, SJ. Marsden (2007). Patterns of supra-canopy flight by pigeons and parrots at a hill-forest site in Papua New Guinea. Emu. 107(2), pp.115-125.
MF. Conti Nunes, M. Galetti, S. Marsden, RS. Pereira, AT. Peterson (2007). Are large-scale distributional shifts of the blue-winged macaw (Primolius maracana) related to climate change?. JOURNAL OF BIOGEOGRAPHY. 34(5), pp.816-827.
SJ. Marsden, CT. Symes, AL. Mack (2006). The response of a New Guinean avifauna to conversion of forest to small-scale agriculture. Ibis. 148(4), pp.629-640.
DC. Lee, SJ. Marsden (2006). Accumulation of knowledge and changes in Red List classifications within the family Galliformes 1980-2004. Biodiversity and Conservation. 15(6), pp.1887-1902.
MS. Sullivan, SJ. Marsden (2006). Extinction risk: Predicting, assessing, prioritising and redressing. Biodiversity and Conservation. 15(6), pp.1857-1858.
MS. Sullivan, MJ. Jones, DC. Lee, SJ. Marsden, AH. Fielding, et al. EV. Young. (2006). A comparison of predictive methods in extinction risk studies: Contrasts and decision trees. Biodiversity and Conservation. 15(6), pp.1977-1991.
AJ. Cahill, JS. Walker, SJ. Marsden (2006). Recovery within a population of the Critically Endangered citron-crested cockatoo Cacatua sulphurea citrinocristata in Indonesia after 10 years of international trade control. ORYX. 40(2), pp.161-167.
CT. Symes, JC. Hughes, AL. Mack, SJ. Marsden (2006). Geophagy in birds of Crater Mountain Wildlife Management Area, Papua New Guinea. Journal of Zoology. 268(1), pp.87-96.
SJ. Marsden, CT. Symes (2006). Abundance and habitat associations of parrots at a hillforest site in Papua New Guinea. Pacific Conservation Biology. 12(1), pp.15-21.
S. MARSDEN (2006). How well will Brazil's system of Atlantic forest reserves maintain viable bird populations?. Biodiv Conserv. 14, pp.2835-2853.
JS. Walker, AJ. Cahill, SJ. Marsden (2005). Factors influencing nest-site occupancy and low reproductive output in the critically endangered Yellow-crested Cockatoo Cacatua sulphurea on Sumba, Indonesia. Bird Conservation International. 15(4), pp.347-359.
BEI. Evans, J. Ashley, SJ. Marsden (2005). Abundance, habitat use, and movements of blue-winged macaws (Primolius maracana) and other parrots in and around an atlantic forest reserve. Wilson Bulletin. 117(2), pp.154-164.
S. Cougill, SJ. Marsden (2004). Variability in roost size in an Amazona parrot: Implications for roost monitoring. Journal of Field Ornithology. 75(1), pp.67-73.
S. Marsden, M. Whiffin, L. Sadgrove, PR. Guimarães (2003). Bird community composition and species abundance on two inshore islands in the Atlantic forest region of Brazil. Ararajuba. 11(2), pp.181-187.
SJ. Marsden, M. Whiffin (2003). The relationship between population density, habitat position and habitat breadth within a neotropical forest bird community. Ecography. 26(4), pp.385-392.
MJ. Jones, SJ. Marsden, MD. Linsley (2003). Effects of habitat change and geographical variation on the bird communities of two Indonesian islands. Biodiversity and Conservation. 12(5), pp.1013-1032.
SJ. Marsden, JD. Pilgrim (2003). Factors influencing the abundance of parrots and hornbills in pristine and disturbed forests on New Britain, PNG. Ibis. 145(1), pp.45-53.
SJ. Marsden, AH. Fielding, C. Mead, MZ. Hussin (2002). A technique for measuring the density and complexity of understorey vegetation in tropical forests. Forest Ecology and Management. 165(1-3), pp.117-123.
SJ. Marsden, M. Whiffin, M. Galetti (2001). Bird diversity and abundance in forest fragments and Eucalyptus plantations around an Atlantic forest reserve, Brazil. Biodiversity and Conservation. 10(5), pp.737-751.
M. JONES (2001). Correlates of extinction risk of birds from two Indonesian islands. Biological Journal of the Linnean Society. 73(1), pp.65-79.
SJ. Marsden, JD. Pilgrim, R. Wilkinson (2001). Status, abundance and habitat use of blue-eyed Cockatoo Cacatua ophthalmica on New Britain, Papua New Guinea. Bird Conservation International. 11(3), pp.151-160.
MJ. Jones, MS. Sullivan, SJ. Marsden, MD. Linsley (2001). Correlates of extinction risk of birds from two Indonesian islands. Biological Journal of the Linnean Society. 73(1), pp.65-79.
SJ. Marsden, GS. Bellamy (2000). Microhabitat characteristics of feeding sites used by diving duck Aythya wintering on the grossly polluted Manchester Ship Canal, UK. Environmental Conservation. 27(3), pp.278-283.
SJ. Marsden (2000). Impact of disturbance on waterfowl wintering in a UK dockland redevelopment area. Environmental Management. 26(2), pp.207-213.
SJ. Marsden, M. Whiffin, L. Sadgrove, P. Guimarães (2000). Parrot populations and habitat use in and around two lowland Atlantic forest reserves, Brazil. Biological Conservation. 96(2), pp.209-217.
SJ. Marsden, MS. Sullivan (2000). Intersexual differences in feeding ecology in a male dominated wintering Pochard Aythya ferina population. Ardea. 88(1), pp.1-7.
S. Marsden, A. Fielding (1999). Habitat associations of parrots on the Wallacean islands of Buru, Seram and Sumba. Journal of Biogeography. 26(3), pp.439-446.
SJ. Marsden (1999). Estimation of parrot and hornbill densities using a point count distance sampling method. Ibis. 141(3), pp.327-390.
MD. Linsley, MJ. Jones, SJ. Marsden (1998). A review of the Sumba avifauna. Kukila. 10, pp.60-90.
SJ. Marsden (1998). Changes in bird abundance following selective logging on Seram, Indonesia. Conservation Biology. 12(3), pp.605-611.
SJ. Marsden, MJ. Jones (1997). The nesting requirements of the parrots and hornbill of Sumba, Indonesia. Biological Conservation. 82(3), pp.279-287.
SJ. Marsden, MJ. Jones, MD. Linsley, C. Mead, MV. Hounsome (1997). The conservation status of the restricted-range lowland birds of Buru, Indonesia. Bird Conservation International. 7(3), pp.213-233.
MJ. Jones, MD. Linsley, SJ. Marsden (1995). Population sizes, status and habitat associations of the restricted-range bird species of Sumba, Indonesia. Bird Conservation International. 5(1), pp.21-52.
SJ. Marsden (1992). The distribution, abundance and habitat preferences of the Salmon-crested Cockatoo Cacatua moluccensis on Seram, Indonesia. Bird Conservation International. 2(1), pp.7-13.
I am Associate Editor for the journal Ibis