Thoday Building, room S10

Email: l.markesteijn@bangor.ac.uk

Tel: 01248 382337 (from U.K.)

+44 1248 382337 (International)

Google Scholar, ORCID, ResearchGate

Tropical forest ecology, Functional ecology, Restoration ecology, Plant-enemy interactions 


As a researcher I am foremost fascinated by biodiversity and as such most of my work is carried out in biologically complex tropical forest ecosystems. My research addresses processes underlying function and co-existence of tropical plants and mechanisms of biodiversity generation and maintenance. I take a special interest in density-dependent mortality or negative density dependence (NDD), as mediated by plant natural enemies, and how it affects regeneration dynamics of tropical plants. I further work on physiological plant responses to limiting resources, resource competition, and tolerance to environmental and global change - principally with respect to water and light. I explore the effects of variation in plant functional traits on individual plant performance and species distribution from local to cross-ecosystem scales.

In addition to being a Senior Lecturer in Forest Scsience at the School of Natural Sciences, I am a Distinguished Research Lecturer (Beatriz Galindo Fellow) in the Area of Biodiversity and Conservation at the Rey Juan Carlos University in Madrid (Spain), and an affiliated researcher at the Smithsonian Tropical Research Institute (STRI) in Panama.

I hold a Ph.D. in Tropical Forest Ecology and an M.Sc. and B.Sc. in Tropical Land Use from Wageningen University (the Netherlands). I worked as a postdoctoral researcher on different projects with STRI and the Universities of Wisconsin-Milwaukee (USA), Oxford (UK), Yale (USA), Oregon State (USA) and Bayreuth (Germany).

PhD candidates:

Dan Fishburn Breaking down the effect of UV light on litter decomposition; a study of carbon cycling along a tropical forest humidity gradient. NERC Envision PhD. 2019 - 2023. (co-supervised with Dr Ana Rey, and Dr Andy Smith)

Anita Weissflog Assessing the role of fungus-mediated plant-soil feedbacks during secondary succession of tropical forests. NERC Envision PhD. 2017 - 2021. (co-supervised with Prof John Healey)

Mark Mosbery Experimental assessment of the ecological processes determining the potential for climbing plants to improve biodiversity and ecosystem function in the urban landscape. KESS - PhD. 2016 - 2020. (co-supervised with Prof John Healey)

MScRes candidates:

Lydia Martin Biotic and abiotic factors influencing establishment success in a tropical tree species; ​Lacistema aggregatum. 2019-2020. (co-supervisor: Anita Weissflog) 

Ada Barbanera Variation in community assembly and diversity of bethnic macrofauna along a mangrove forest degredation gradient in southeastern Kenya. 2018-2019. (cosupervisor: Dr Martin Skov)

Dan Fishburn Seasonal changes in litter structural components and microbial activity as a consequence of biotic and abiotic mechanisms of litter decomposition in drylands 2017-2018. (co-supervisor: Dr Ana Rey)

Teaching:

Module leader:

Module contributions:

I am always keen to discuss PhD opportunities related to any of the topics I mention under "Research Interests'.

2022

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2021

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2020

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2019

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2018

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2017

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2016

2015

2014

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2013

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2011

2010

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2009

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2008

2007

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2022

2020

  • Frontiers in Forests and Global Change (Cyfnodolyn)

    Review Editor on the Editorial Board of Tropical Forests (a specialty section of Frontiers in Forests and Global Change)

    Ebr 2020 →

    Gweithgaredd: Gweithgarwch golygyddol (Aelod o fwrdd golygyddol)
  • Fungal pathogens and insect herbivores mediate seedling dynamics and diversity patterns along a tropical forest humidity gradient

    One persistent explanation for plant species coexistence in tropical forests, the Janzen-Connell mechanism, postulates that density-dependent mortality mediated by natural plant enemies, such as fungal pathogens and insect herbivores, puts locally rare plant species at an advantage, preventing any one species from dominating. Evidence from vegetation plots suggests that this form of density-dependence plays a key role in the maintenance of plant diversity in the tropics.

    Still, most theories explaining species coexistence emphasize on local processes, while one of the clearest and best-documented patterns in plant diversity is the strong correlation between diversity and humidity at regional to global scales. While differential plant drought sensitivity is an important determinant of changes in plant species composition along humidity gradients, alternative mechanisms are needed to explain positive diversity-humidity correlations.

    To investigate how Janzen-Connell effects vary with humidity, we monitored seed arrival and seedling recruitment for 18 months at eight forest sites spanning a steep natural precipitation gradient across the Isthmus of Panama (1756 – 3203mm). In each of the 1ha forest plots, seeds were collected from fifty 1m2 seed traps every fortnight, and seventy-five 1m2 seedling plots that were treated with either a fungicide, an insecticide or used as a control (sprayed with equal amounts of water). All seeds and seedlings were identified by experts to the lowest taxonomical level, and seedling dynamics were monitored using four consecutive seedling censuses, every six months.

    Results show that seedling recruitment was negatively density-dependent in control plots and that the strength of the negative density dependent effect increased along the precipitation gradient. This density-dependence was greatly reduced in the pesticide-treated plots. The insecticide treatment also largely eliminated the increase in diversity observed in control plots when comparing seedlings to seeds. The positive effects of insect herbivory on plant diversity increased significantly with rainfall.

    Our results suggest a mechanistic explanation for the well-documented positive relationships between humidity and (i) the strength of negative density dependence and (ii) overall tropical forest plant diversity, where fungal pathogens, and especially insect herbivores operate as important mediators.

    4 Maw 2020

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  • Determinants of taxonomic, functional and phylogenetic diversity that explain the distribution of woody plants in tropical Andean montane forests along altitudinal gradients

    International doctorate mention evaluation

    6 Ion 2020

    Gweithgaredd: Arholiad (Arholwr)

2019

  • Overview of forestry distance learning at Bangor University

    Oral presentation made at a Research Colloquium event at the headquarters of the Forestry Research Institute of Ghana

    18 Gorff 2019

    Cysylltau:

    Gweithgaredd: Cyflwyniad llafar (Siaradwr)
  • Special variation of floodplain vegetation in Nong thung tong non-hunting area, peninsular Thailand

    The overall objective of this dissertation is to ‘gain increased understanding of the processes that govern plant species composition and structure of floodplain vegetation in Nong thung tong Non-Hunting Area’, an isolated and threatened 61.5 km2 patch of native floodplain forest in Southern Thailand. In the dissertation Mr Ponlawat Pattarakulpisutti presents results from a set of compatible field surveys and experiments in four separate data chapters (chapters 2 – 5). A general introduction (chapter 1) highlights our state of understanding of the study system and highlights the mechanisms of flooding tolerance among species, and how it should drive species distributions in these forests. It provides the broader context for the study. A general discussion (chapter 6), aims to tie everything together in the end. The four data chapters specifically showcase;

    a. A field vegetation survey, shows how species differ in occurrence among predefined flooding landforms and how their distribution is (co)determined by a set of abiotic factors (soil fertility, clay content, land use history etc.), using multivariate ordination techniques (NMDS). The derived species distributions and flooding regimes serve to justify species selection for experimental work in the following chapters,

    b. A seedling growth and survival experiment on four dominant tree species subjected to different flooding and recovery from flooding treatments shows that species differ markedly in flooding tolerance.

    c. A seed flotation and viability after flooding experiment again shows some differences among selected species, and

    d. The final data chapter assesses the natural regeneration and recruitment of species in the field.

    As very little is known about floodplain forest ecology in general, and especially the threatened floodplain forests of Thailand, this dissertation should be considered as a relevant and timely piece of work. This dissertation will add new and original understanding to the broader field of floodplain forest ecology.

    12 Meh 2019

    Gweithgaredd: Arholiad (Arholwr)

2018

  • Newton Fund International Workshop on Dry Forests

    This workshop focussed on developing a better understanding of the species and habitats of dry forests and the interaction between dry forest biodiversity and its people. It brought together experts and researchers from the UK and Latin America with shared interests in dry forest biodiversity and sustainable management practices for rural communities. The workshop was led by a joint UK-Peru team with a recognised track record of biodiversity research and capacity building, including South American students successfully trained at doctoral and master's levels, publishing collaborative research in scientific journals, and experience in conservation and development projects in the region. Together, they exchanged knowledge and experiences of the common ecosystem and biodiversity issues across dry forest regions (e.g. from Colombia, Peru, Argentina) and forged a new roadmap that identifies the priority research areas relevant for sustainable management, match capacity building needs and opportunities, and identify key stakeholders. A jointly agreed programme of work produced by all participants outlined potential sources of funding for the longer-term sustainability of new research partnerships centred on exchange and research visits, and mentoring of a new generation of career-young Latin American researchers.

    18 Gorff 2018 – 20 Gorff 2018

    Gweithgaredd: Cymryd rhan mewn gweithdy, seminar, cwrs (Cyfranogwr)
  • Innovation in commercial soil health analysis and practical on farm guidance.

    PhD dissertation

    1 Mai 2018 →

    Gweithgaredd: Arholiad (Arholwr)
  • Effect of freeze-thaw events on microbial activities in polar soils

    1 Maw 2018 →

    Gweithgaredd: Arholiad (Arholwr)
  • Delineating protected honey-bee reserves at a regional scale. PhD.

    1 Chwef 2018 →

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2017

2016

2013

2012

  • The Secret Life of the Rainforest

    Secret Life of the Rainforest

    Rainforests cover just six percent of Earth’s surface yet contain almost half of the world’s plants and animals. On Barro Colorado Island in Panama, home to the Smithsonian Tropical Research Institute, a perfect microcosm of nature exists that boasts a diversity of mammals, birds, and bugs that is unrivaled almost anywhere in the world. Follow Smithsonian researchers Ben Hirsch, Lars Markesteijn, and Leonor Álvarez Cansino as they explore how life thrives in one of the most complex habitats on Earth. Winner, CINE Golden Eagle.

    16 Gorff 2012

    Cysylltau:

    Gweithgaredd: Mathau o waith ymgysylltu â'r cyhoedd a gwaith maes - Erthygl neu gyfranogiad yn y cyfryngau (Cyfrannwr)

Biography

I obtained my PhD in 2010 at Wageningen University (the Netherlands). In my dissertation, I addressed the functional ecology of tropical tree species, aiming to understand how species’ drought and shade tolerance strategies explain species coexistence and distribution along resource gradients. In early 2010, I was awarded a 2-year Rubicon grant by the Netherlands Organisation for Scientific Research (NWO), that I used to collaborate with the Smithsonian Tropical Research Institute (STRI) in Panama and the Unoiversity of Wisconsin-Milwaukee (UWM) to study the role of plant hydraulics in explaining differences in drought performance between liana and tree species. Late in 2011, I moved to Spain where I visited the Ecology and Global Change group at the National Museum of Natural Sciences, Spanish National Research Council (MNCN-CSIC) in Madrid for a year. Early in 2013, I started working on the NERC-funded project, entitled ‘Natural enemies, climate and the maintenance of tropical tree diversity’, at Community Ecology Research Oxford (CERO), University of Oxford, in collaboration with STRI. In this project we set out to test the hypothesis that humidity drives variation in tropical plant diversity through its influence on the interactions between plants and their natural enemies. The 2015-2016 El Niño event, and subsequent funding through a RAPID grant by the United States National Science Foundation (US NSF), provided an unique opportunity for a third postdoc to study the immediate effects of an extreme drought event on the physiological performance and regeneration dynamics of tropical plants along a rainfall gradient. This project resulted from a collaboration between Oregon State, Yale School of Forestry, Bayreuth University and STRI. In 2016, I joined the School of Natural Sciences in 2016 as a Lecturer in Forest Sciences, and a SÊR Cymru MSCA CoFund Research Fellow, and was promoted to Senior Lecturer in 2019. Finally, in 2020 I joined the Area of Biodiversity and Conservation (Biodiversos) at the Department of Biology and Geography, Physics and Inorganic Chemistry, Rey Juan Carlos University in Madrid, as a Distinguished Research Lecturer (Beatriz Galindo Fellow).

Qualifications 

2010                PhD Tropical forest ecology Wageningen University, the Netherlands

2005                MSc Tropical land use Wageningen University, the Netherlands

2002                BSc Tropical land use Wageningen University, the Netherlands

Affiliations

Rey Juan Carlos University, Smithsonian Tropical Research Institute

Membership of Professional Bodies

2005 – present     Association for Tropical Biology and Conservation (ATBC)

2013 – present     British Ecological Society (BES)

2013 – present     Red Española de Ecología Tropical (REDTROP)

2016 – present     Royal Forestry Society (RFS)

2016 – present     International Society for Tropical Foresters (ISTF)