Individual tree traits shape insect and disease damage on oak in a climate-matching tree diversity experiment

Diversifying planted forests by increasing genetic and species diversity is often promoted as a method to improve forest resilience to climate change and reduce pest and pathogen damage. In this study we used a young tree diversity experiment replicated at two sites in the UK to study the impacts of tree diversity and tree provenance (geographic origin) on the oak (Quercus robur) insect herbivore community and a specialist biotrophic pathogen, oak powdery mildew. Local UK, French and Italian provenances were planted in monocultures, provenance mixtures and species mixes, allowing us to test whether: 1) local and non-local provenances differ in their insect herbivore and pathogen communities, and 2) admixing trees leads to associational effects on insect herbivore and pathogen damage. Tree diversity had variable impacts on foliar organisms across sites and years, suggesting that diversity effects can be highly dependent on environmental context. Provenance identity impacted upon both herbivores and powdery mildew, but we did not find consistent support for the local adaptation hypothesis for any group of organisms studied. Independent of provenance, we found tree vigour traits (shoot length, tree height) and tree apparency (the height of focal trees relative to their surroundings) were consistent positive predictors of powdery mildew and insect herbivory. Synthesis. Our results have implications for understanding the complex interplay between tree identity and diversity in determining pest damage, and show that tree traits, partially influenced by tree genotype, can be important drivers of tree pest and pathogen loads

National efforts toward FGM-free villages in Egypt: The evidence of impact

This report is a midterm evaluation and documentation of the process and approach of the FGM-Free Village Model implemented in Egypt by the National Council of Childhood and Motherhood with assistance from the Population Council. In a comparison of responses from women and men in intervention groups to those in nonintervention (control) villages, data analysis shows that the program has been successful in changing views and attitudes toward female genital mutilation (FGM). FGM is an entrenched generational practice, and eradicating it in a community requires concerted effort over an extended period of time. This evaluation strongly recommends that efforts be continued by means of a sustained and protracted process. Advocacy and awareness-raising efforts that take a holistic multisectoral approach constitute best practices that must to be sustained in order to maintain their impact for future generations

Toward FGM-free villages in Egypt: A mid-term evaluation and documentation of the FGM-free village project

This Population Council report is a mid-term evaluation and documentation of the process and approach of the FGM-Free Village Model in Egypt. The objective of this report is to create a knowledge base of information to support policy dialogue on female genital mutilation (FGM) and to assist in transferring knowledge about the model to other communities across Egypt and other countries where FGM is practiced. Impact evaluation at the community level shows the significant impact of the project in changing views and attitudes toward FGM among intervention groups. However, it also shows that FGM is an entrenched generational problem that requires concerted efforts over an extended period of time. The report strongly recommends that efforts be continued through a sustained and protracted process: advocacy and awareness-raising efforts that take a holistic multi-sectoral approach constitute best practices that need to be continued in order to maintain impact for the coming generations

The natural capital of floodplains: management, protection and restoration to deliver greater benefits

Key Messages • This review of scientific literature has shown that semi-natural floodplain habitats are a vitally important component of the UK’s natural capital. • They provide a wider range of goods and services than intensive arable/horticultural crops. • The dearth of such habitats in functioning floodplains reduces our resilience to floods and drought, reduces the abundance of pollinating insects and natural pest control agents, and reduces the potential for carbon sequestration and water quality improvements. • Floodplains occupy only 5% of land area in the UK, yet targeted investment here would yield massive savings and gains for society as a whole

Root ectomycorrhizal status of oak trees symptomatic and asymptomatic for Acute Oak Decline in southern Britain

Acute Oak Decline (AOD) is a decline-disease that has distinctive symptoms and poses a serious threat to oak. Our understanding of the causal factors of AOD remains poor but it is likely that multiple biotic and abiotic factors contribute to a deterioration in oak condition. There is evidence that indications of above-ground tree health status are frequently reflected below-ground in roots and associated ectomycorrhizal (ECM) fungal communities. However, no study has yet explored these potential relationships specifically in AOD affected trees. In this study, we compare the composition and range of functional exploration types of ECM communities associated with AOD symptomatic oak trees and with AOD asymptomatic trees in three oak-dominated woodlands in southern England. We additionally assess the abundance of fine roots tips in surface soils beneath AOD symptomatic and asymptomatic trees and consider soil physico-chemical effects on ECM communities. The frequency of fine root tips was found to be significantly higher on asymptomatic compared with symptomatic trees in two of the three woodlands studied and long-distance ECM exploration types had a weak positive association with AOD asymptomatic trees. ECM diversity and composition were, however, unaffected by tree symptom status and were not related to the frequency of fine root tips. ECM diversity and compositional (but not exploration type) differences were evident only between the different woodlands and this was related to a small number of soil chemistry variables. This study revealed a relationship between the above-ground symptoms of AOD (i.e. stem lesions and Agrilus biguttatus exit holes) and the frequency of live root tips, providing a potential additional diagnostic tool of trees in decline and highlighting the importance of considering belowground rhizosphere microbiome communities

Climate affects neighbour‐induced changes in leaf chemical defences and tree diversity‐herbivory relationships

1. Associational resistance theory predicts that insect herbivory decreases with increasing tree diversity in forest ecosystems. However, the generality of this effect and its underlying mechanisms are still debated, particularly since evidence has accumulated that climate may influence the direction and strength of the relationship between diversity and herbivory. 2. We quantified insect leaf herbivory and leaf chemical defences (phenolic compounds) of silver birch Betula pendula in pure and mixed plots with different tree species composition across 12 tree diversity experiments in different climates. We investigated whether the effects of neighbouring tree species diversity on insect herbivory in birch, that is, associational effects, were dependent on the climatic context, and whether neighbour-induced changes in birch chemical defences were involved in associational resistance to insect herbivory. 3. We showed that herbivory on birch decreased with tree species richness (i.e. associational resistance) in colder environments but that this relationship faded as mean annual temperature increased. 4. Birch leaf chemical defences increased with tree species richness but decreased with the phylogenetic distinctiveness of birch from its neighbours, particularly in warmer and more humid environments

A global database for metacommunity ecology, integrating species, traits, environment and space

The use of functional information in the form of species traits plays an important role in explaining biodiversity patterns and responses to environmental changes. Although relationships between species composition, their traits, and the environment have been extensively studied on a case-by-case basis, results are variable, and it remains unclear how generalizable these relationships are across ecosystems, taxa and spatial scales. To address this gap, we collated 80 datasets from trait-based studies into a global database for metaCommunity Ecology: Species, Traits, Environment and Space; “CESTES”. Each dataset includes four matrices: species community abundances or presences/absences across multiple sites, species trait information, environmental variables and spatial coordinates of the sampling sites. The CESTES database is a live database: it will be maintained and expanded in the future as new datasets become available. By its harmonized structure, and the diversity of ecosystem types, taxonomic groups, and spatial scales it covers, the CESTES database provides an important opportunity for synthetic trait-based research in community ecology

A leap forward in geographic scale for forest ectomycorrhizal fungi

Published versio

Drivers of the composition and diversity of carabid functional traits in UK coniferous plantations.

Functional diversity (FD) is increasingly used as a metric to evaluate the impact of forest management strategies on ecosystem functioning. Management interventions that aim to maximise FD require knowledge of multiple environmental drivers of FD, which have not been studied to date in temperate coniferous production forests. We quantified the relative importance of abiotic (forest management) and biotic (ground vegetation community) drivers of carabid FD and trait distribution in 44 coniferous plantation forest stands across the UK. Carabid FD declined with canopy cover and carabid body length correlated negatively with the percentage of open semi-natural area surrounding a plot. We conclude that forest management could enhance carabid FD through initiatives that emulate natural disturbance regimes through gap creation. We found that neither functional nor taxonomic metrics of vegetation diversity correlated with carabid FD, suggesting that restoration of plant communities, a major goal of forest restoration efforts, will not necessarily enhance carabid FD in coniferous plantations

Implementation of an assessment and monitoring programme for Irish and British forests. BIOPLAN Final Report

A report describing in detail the scientific research that underpins the 30 specific recommendations are made for policy and practice in the Irish forestry sector made by the project.The four year BIOPLAN project ‘Implementation of an assessment and monitoring programme for biodiversity in Irish and British forests’ had the principal objective to identify ways in which forest policy and management can safeguard the future of forest biodiversity and associated ecosystem services, and inform environmentally sustainable expansion of Ireland’s forests. From the research findings, 30 specific recommendations are made for policy and practice in the Irish forestry sector to mitigate the effects of forest management on biodiversity. These recommendations are underpinned by sound scientific research to ensure that their implementation will help to deliver on Ireland’s commitment to sustainable forest management