Woodland Plants Research Articles

New woodlands are boosting the Shetland Islands' sawfly diversity (Hymenoptera: Symphyta: Tenthredinidae)

Five species of sawfly are recorded for the first time from the Shetland Islands, four of which were found in a planted woodland first established in 1996. All five use shrubs and trees as larval hosts: two are attached to Alnus Mill., and three exclusively or mainly to Salix L. Whereas the Alnus -feeders have almost certainly been introduced to Shetland, the history of the Salix -feeders in the archipelago is unclear. Pristiphora sermola Liston, 1993, is faunistically noteworthy, having previously been recorded in the British Isles from only two localities in the Scottish mainland. With these additions, the known sawfly fauna of Shetland now comprises 13 established species, with one more needing confirmation.

Isolation limits spring pollination in a UK fragmented landscape

Animal-mediated pollination determines the reproductive success of most flowering plants; this process however can be disrupted by environmental degradation, with habitat loss and fragmentation highlighted as a top driver of pollination deficits. Despite being a pervasive stressor worldwide, we still have rather limited empirical evidence on its effects on pollination services, especially for early spring pollination syndromes. We investigate this using a potted plant phytometry experiment in which we placed English Bluebell (Hyacinthoides non-scripta)—a species largely pollinated in spring—into a fragmented woodland habitat. We selected 51 woodland patches which varied in both size and distance from each other and placed 153 pots of bluebell plants in the patches for c.4 weeks to measure pollination. The woodlands were located in a matrix of grassland, the latter being of low plant species richness and overall in the patches, woodland plants showed a positive species-area relationship. We collected traits on bluebell reproduction, these included the number, size, quality of seeds, the number of seed capsules and the number of flowers that failed to set any seeds. We found that seed traits responded differently to patch area and isolation. Patch isolation negatively affected the number of seeds and capsules, whilst it did not affect the size and quality of seeds. Patch area had no effect on any traits, suggesting that patch area might not necessarily be a factor that affects pollination in this species. The number of flowers that failed to set seed was unaffected by either patch area or isolation. Our study suggests that woodland fragmentation impacts the pollination of understory spring flowering plants. Our results highlight the use of multiple traits of phytometer plants to evaluate pollination and the importance of connectivity in maintaining pollination services in small-fragmented landscapes.

An assessment of policies to promote perennial energy crop and woodland planting

If the UK is to meet its target of reducing greenhouse gas (GHG) emissions to net zero by 2050, significant land-use change will be required. More woodland will have to be created and more perennial energy crops (PECs) will need to be grown. Land will also be required for food production, habitat restoration, and for new settlements. Government intervention will be required if landowners are to deliver this transition in land use. This research identified 43 policies that had been proposed for delivering increased planting of PECs and new woodlands. Their desirability, feasibility and potential effectiveness were assessed by a panel of experts using a policy Delphi method. Results showed that the most important was a comprehensive land-use policy, which will have to be delivered by the post-Brexit, Environmental Land Management (ELM) scheme in the UK. PEC cultivation could be most effectively encouraged by delivering investment or incentives to electricity generators at the top of the supply chain. Woodland creation requires support from attractive, well-administered grants to replace annual farm income. Educational and informational policies are also needed to breakdown the divisions between the farming and forestry sectors, and to overcome reluctance of landowners and farmers to grow non-food crops.

Larger and structurally complex woodland creation sites provide greater benefits for woodland plants

Abstract Reforestation initiatives are underway across the world. However, we know relatively little about the ecological consequences of creating and restoring forest ecosystems, and there is a lack of studies examining the drivers of species colonisation and establishment across appropriate temporal and spatial scales to inform conservation practice. Using data from a long‐term natural experiment (the WrEN project), we explore ground plant species occurrence and community composition in 102 woodland creation sites (10–160 years since planting), and 27 old growth woodlands (>250 years). We conducted field surveys to collect data on occurrence of plant species (classified into woodland specialist, woodland generalist, or non‐woodland) and used Structural Equation Modelling to investigate the influence of local (age, size, woodland structure) and landscape‐level (amount of surrounding woodland) attributes on species richness. Woodland generalists are readily colonising woodland creation sites to similar levels found in old growth woodlands. However, there were fewer woodland specialist and more non‐woodland plants in creation sites than in old growth. Specialists and generalists were more likely to be present in larger woodlands and those with higher variation in tree size (which was higher in older woodlands) and did not appear to be influenced by features of the surrounding landscape. Some plant communities in older creation sites (80–160 years) were similar to old growth, suggesting colonisation of a typical old growth flora over time; however, some sites were shifting away from this trajectory. Specialists are slow to colonise woodland creation sites and their occurrence was low relative to old growth woodlands even after >80 years. However, woodland management to increase structural complexity may enhance the establishment of woodland plants. The lack of influence of the surrounding landscape on species occurrence is likely due to most of the study sites being relatively isolated resulting in limited colonisation. This suggests that new woodlands need to be adjacent or very near to existing woodland to receive the benefits of increased colonisation. Our results highlight the importance of creating large and structurally complex woodlands, close to existing woodlands to facilitate the colonisation and establishment of woodland plants.

Can the impacts of invasive African Olive on native Cumberland Plain Woodland plants be mitigated through bioinoculation?

SummaryInvasive plants often impact the abiotic and biotic conditions of the ecosystems they invade. These impacts can persist after the removal of the invader as legacy effects that may hamper restoration. We assessed whether the invasion of Cumberland Plain Woodland in Australia by African Olive impacts the performance of native species through legacy effects. We also tested whether the addition of soil inocula from uninvaded Cumberland Plain Woodland and rhizosphere soils can mitigate the effects of invaded soils on native plant performance. To do this, we grew four native Cumberland Plain Woodland species (Australian Indigo, Climbing Saltbush, Hickory Wattle, Wedge‐leaf Hop‐bush) in mesocosms containing either uninvaded Cumberland Plain Woodland soil, African Olive‐invaded Cumberland Plain Woodland soil or invaded Cumberland Plain Woodland soil inoculated with uninvaded or native rhizosphere soil. We found invaded soils to not consistently impact the growth of the Cumberland Plain Woodland species studied. In invaded soil, Hickory Wattle produced lower above and belowground biomass, Climbing Saltbush produced lower belowground biomass and Australian Indigo had a lower root to shoot ratio compared to plants grown in Cumberland Plain Woodland soil. The nodulation of Australian Indigo did not differ between soil treatments, while that of Hickory Wattle responded positively to inoculation. Our results suggest that the addition of native soil biota may improve the outcomes of ecological restoration projects on a species‐specific basis.

Limited efficacy of a commercial microbial inoculant for improving growth and physiological performance of native plant species.

Soil microbial inoculants are increasingly being explored as means to improve soil conditions to facilitate ecological restoration. In southwestern Western Australia, highly biodiverse Banksia woodland plant communities are increasingly threatened by various factors including climate change, land development and mining. Banksia woodland restoration is necessary to conserve this plant community. The use of microbial inoculation in Banksia woodland restoration has not yet been investigated. Here, we evaluated the efficacy of a commercial microbial inoculant (GOGO Juice, Neutrog Australia Pty Ltd) for improving the performance of 10 ecologically diverse Banksia woodland plant species in a pot experiment. Plants were subjected to one of two watering regimes (well-watered and drought) in combination with microbial inoculation treatments (non-inoculated and inoculated). Plants were maintained under these two watering treatments for 10weeks, at which point plants in all treatments were subjected to a final drought period lasting 8weeks. Plant performance was evaluated by plant biomass and allocation, gas exchange parameters, foliar carbon and nitrogen and stable isotope (δ15N and δ13C) compositions. Plant xylem sap phytohormones were analysed to investigate the effect of microbial inoculation on plant phytohormone profiles and potential relationships with other observed physiological parameters. Across all investigated plant species, inoculation treatments had small effects on plant growth. Further analysis within each species revealed that inoculation treatments did not result in significant biomass gain under well-watered or drought-stressed conditions, and effects on nitrogen nutrition and photosynthesis were variable and minimal. This suggests that the selected commercial microbial inoculant had limited benefits for the tested plant species. Further investigations on the compatibility between the microorganisms (present in the inoculant) and plants, timing of inoculation, viability of the microorganisms and concentration(s) required to achieve effectiveness, under controlled conditions, and field trials are required to test the feasibility and efficacy in actual restoration environments.

Interaction between weeding, outplanting date and site in open oak woodland plantations

In this paper we explore ways of improving the field performance of oak plantations for the regeneration of open woodlands in Mediterranean environments. Using the evergreen, sclerophyllous holm oak species (Quercus ilex L. subsp. ballota (Desf.) Samp.), we analyzed the effects of the outplanting date (October vs. February), vegetation competition (weeding vs. untreated), the environmental conditions imposed by the outplanting site, and the interactions between all these factors. For test purposes, 3 blocks of 200 one-year-old holm oak nursery-grown seedlings were set up in four sites in SE Spain (Becerra, Mágina, Jarosa and Hinojosa). Half of each block (plot) was weeded to prevent competition from other vegetation. In each plot (weeded or not) half of the seedlings were outplanted in October 2019 and the other half in February 2020. In total, 2400 holm oak seedlings were planted to be monitored over the course of two growing seasons. Survival and growth-related parameters such as height, root collar diameter, number of leaves and total and fractional aerial biomass were recorded. Weeding was shown to be the most important factor affecting both survival and seedling growth, especially in sites with a milder autumn and winter, and a long, intense summer, such as Jarosa and Hinojosa. In colder locations, however, October outplanting was more advantageous, especially if accompanied by weeding (Becerra and Mágina). In cases where competition from native species is not controlled, it would be advisable to plant in October, in terms of both survival and development of the seedlings, especially in colder sites. In general terms, the best option was outplanting in October plus weeding, while the worst option was outplanting in February with no weeding. This study provides new tested recommendations on how to improve the success of oak plantations in different Mediterranean environments.

An Evaluation of Impact of Precision Farming on the Production of Medicinal as well as Aromatic Crops

Precision site-specific crop methods of production have grown increasingly popular in countries with modern agriculture. It is not unexpected that adopting precise approaches is now necessary in the cultivation of therapeutic crops. Therapeutic herbs, also referred to as herbal drugs, have been discovered and used by humans in conventional medical treatments since ancient times. Many chemical compounds are produced by plants for a variety of purposes, including defence and protection against herbivorus animals, fungus, insects, and illnesses. While aromatic plants are utilized for their scent and flavor, medicinal plants are often those that are employed in modern and traditional medicine. Although smart farming as well as agriculture in aromatic and herbal plants have been studied, little has been published despite precision agriculture’s long history and recent significant proliferation throughout the agriculture and scientific communities. The use of this novel approach and innovation can only be effective if it promotes ecological preservation and sustainable production. It’s interesting to note that this later area is more advanced than modern (precision) plant production methods while examining both seasonal and permanent woodland plants, as well as when describing interplant interaction. It is possible to discover new techniques for using sensor networks in ecological studies from the study of therapeutic plants. The chapter discusses the potential applications of hand-harvesting and precision crop production technology devoted to the growing of therapeutic herbs.

How Protected Areas Are Transforming Within Megapolis: An Advanced Spatiotemporal Legislative Model

Compared to pristine ecosystems, urban protected areas (PAs) are exposed to intensified pressure and deterioration due to rapid population growth and entangled stakeholders’ interests. At the same time, these valuable ecosystems provide cities with ecosystem services, including cultural ones, and enhance the quality of life. Spatial analysis of PAs’ transformations in the context of the multidisciplinary approach contributes to the detection and safeguarding of vulnerable ecosystems. The study object is the protected areas of Moscow megapolis (within boundaries until 2012), whereas the study subject is the spatial and temporal PA’s transformations established by legislative acts. The research question is to devise a model of transformations designated by law within urban PAs and affecting their borders, land use, and rate of ecosystem deterioration. To achieve the research question, three goals were set: to gather spatial data on PAs’ transformations within Moscow designated by legislative acts; to design a comprehensive and exhaustive classification of PAs’ transformations established by legislative acts; to model spatial and temporal trends in transformations of Moscow PAs (1985-2022), according to the classification devised. The 3-compound framework for the analysis of legislative transformations (downgrading, downsizing, degazettment of protected areas) was coupled by content analysis of transformation events, GIS mapping, and spatial analysis of urban vegetation through NDVI (normalized difference vegetation index) estimations and raster computations in QGIS and GDAL software. The originality of our study derives from: the analysis of the 4th transformations’ compound (design failures of new PAs); spatial comparison with positive transformations, strengthening nature conservation; uncovering detailed subtypes and levels of transformations; applying this approach to the local scale of megapolis. Our study is based on: 1985-2022 legislative acts with text and map representations of PAs’ borders, zones and land-use designated by regional government and national ministries; national and Moscow open-access spatial data hubs; Moscow online news; 2001-2021 Landsat imageries and Global Forest Change data on Moscow region. Adverse transformations affected a larger area than positive ones (53.8% of a total PA area compared to 22.6%). Positive transformations contributed by PAs’ design (49.5%) mostly, while adverse ones – by easing of restrictions on land use (60.3%) and failures in the design of new PAs (22.8%). Adverse transformations are mainly reflected in the downsizing of zones with the strictest prohibitions on land use (-68% on average) and a low share of designed PAs (54%) through the period 1985-2022. Woodland plantations dramatically expanded (+86.5%), replacing seminatural urban forests (2005-2021). Hence, PA’s ability to supply ecosystem services has been considerably diminished. In regard to Moscow, considerable adverse trends in nature protection were revealed, generally hidden from the public. The analyzed typology of Moscow PAs’ transformations is quite conventional and may be improved through comparisons with other megapolises abundant in natural heritage to advance the model devised and elicit threats to nature conservation.

Spatial targeting of woodland creation can reduce the colonisation credit of woodland plants

Abstract Colonisation credit refers to the temporal lag between positive conservation actions and species' responses and may be one of the reasons we fail to meet short‐term conservation targets. This is particularly evident in woodlands which take decades to develop and harbour slow colonising species. Given global objectives to increase woodland cover, it is important to know the timeframe within which colonisation credit will be fulfilled. The colonisation of woodland plants was examined in recent woodlands, created between 15 and 80 years ago, and located adjacent or isolated from existing ancient woodlands. Colonisation credit was calculated as the proportion of understory woodland plant species in the nearest ancient woodland which had not colonised recent woodlands. Looking at individual species traits also allowed us to tease apart their impact on the species colonisation and establishment ability. Spatial adjacency between created and ancient woodland reduced colonisation credit by an average of 28%, and more mature created woodlands (50–80 years old) had fulfilled 24% more of their colonisation credit on average than younger created woodlands (15–21 years old). However, mature woodlands created adjacent to ancient woodlands had still only been colonised by an average of 72% of the available species pool. Plants which had reached adjacent created woodlands were dispersed by a range of mechanisms, where those that had reached more isolated sites were largely dispersed by birds or mammals. Low community weighted mean shade tolerance, high community weighted nutrient affiliation, and the dominance of Hedera helix suggest that competition from dominant natives may be preventing certain species establishing in new woodlands. This research demonstrates the need to account for appropriate time‐lags when setting biodiversity targets, with most sites still displaying colonisation credit decades after they were created. The results also indicate that spatially targeting woodland creation adjacent to species‐rich mature woodlands should be prioritised. Still, poor local habitat conditions may lead to the dominance of specific competitors which prevent a range of other species from establishing. Local management interventions such as translocations and tree thinning may ameliorate this but further research is needed.

Farmers’ attitudes towards, and intentions to adopt, agroforestry on farms in lowland South-East and East England

Agroforestry (AF) is a land use that incorporates growing trees into agricultural crops and/or livestock production on the same piece of land. Due to tree cover and growth, AF has the potential to generate additional products, enhance biogenic carbon capture and storage, reduce soil erosion and surface water run-off and improve soil structure and fertility. These effects are likely to improve farmers’ financial return with minimal land loss to agricultural production. To date, there has been very little uptake of AF in the UK despite awareness of these benefits and increasing policy support. This suggests that there are barriers to adopting AF that policy, or market developments, have yet to address. This study set out to identify these barriers, along with potential drivers to further uptake of AF in South-East and East lowland England by means of a survey of 224 farmers and landowners in 2019 covering a range of farm sizes and types. Of those farmers who said they might consider planting small areas of AF, small woods and plantations were the preferred option. Silvo-arable AF was preferred to silvo-pastoral AF. If raised to the regional level, this could take up to some 5 % of the total farmed area. Financial reasons were behind some of the reluctance to plant, as was the view that trees might interfere with other farm operations. Farmers might need both planting grants and maintenance payments to help the UK Government reach their woodland planting goal to achieve the UK net-zero target by 2050.

Evaluating the effectiveness of land use management as a natural flood management intervention in reducing the impact of flooding for an upland catchment

AbstractNatural flood management (NFM) is a method for reducing flooding by using a catchment‐based approach to managing flood risk. Understanding and quantifying the impact of implementing NFM at the catchment scale remains ambiguous with a clear need for robust empirical evidence. A combination of fieldwork, laboratory analysis and modelling was applied to quantify the impacts of land use management changes on catchment flood hazard. Soil hydraulic conductivity was measured under varying land management regimes and used to parameterize a physically based spatially distributed hydrological model (SD‐TOPMODEL). A suite of stakeholder informed land management scenarios was modelled, permitting the quantification of the impact of NFM interventions on the timing and the intensity of the peak discharge at the catchment outlet. The findings support the implementation of NFM interventions as a means of reducing flood hazard within a rural upland catchment. Improved soil infiltration provided the greatest reduction in the intensity and delayed timing of the flood peak for a 10‐year occurrence storm event (7% reduction in peak runoff and 8% increase in lag time) with similar reductions observed for a 100‐year storm event. Catchment wide woodland planting reduced peak flow by 11% during the 100‐year event but was not effective during the 10‐year event. Riparian buffer strips provided consistent reductions in peak flow and in the timing of the peak across both storm events with no significant differences relating to vegetation age. Critically, we observed that the effect of implementing multiple NFM interventions was not additive and that efficiencies can be made in using this modelling approach to prioritize the most effective outcomes.

Modelling the effectiveness of land‐based natural flood management in a large, permeable catchment

AbstractIn the United Kingdom, woodland planting and soil and crop management are being promoted as approaches to tackling flooding. Although evidence is limited, it is thought tree planting and regenerative agriculture practices such as crop–herbal ley pasture rotations increase infiltration, soil water storage and evapotranspiration, potentially reducing flooding. A process‐based soil–water–vegetation model was coupled with a semi‐distributed groundwater model to explore the impact of these interventions on peak and low flows in a large, groundwater‐dominated catchment. Land use change and management were found to have limited potential to reduce flooding in this setting. Herbal ley–crop rotations produced a <1% reduction in flow for return periods >2 years, and levels of woodland planting judged to be the realistic maximum produced reductions of 0.2%–2.6%, depending on tree species. Broadscale spruce planting was the only scenario to produce significant reductions in peak flow (16.0%–24.7% at return periods 1–15 years); however, the level of spruce planting required to achieve these reductions was estimated to reduce Q95 flow by ~39%, which would likely have negative implications for water security and ecological river flows. The impact of land‐based natural flood management interventions for flood prevention in large, permeable catchments should not be overstated.

Simulated aboveground herbivory is not a source of context dependence in plant-soil feedbacks for individually-grown native and invasive woodland plants

Simulated aboveground herbivory is not a source of context dependence in plant-soil feedbacks for individually-grown native and invasive woodland plants

Unveiling the ghosts of landscapes past: Changes in landscape connectivity over the last decades are still shaping current woodland plant assemblages

Abstract In ever‐changing landscapes, there is increasing evidence that current plant assemblages are shaped by the temporal dynamics of landscape connectivity. So far, attempts to take the temporal dynamics of connectivity into account have only focused on the degree of connectivity at one or several moments in time, but neglected the cumulative effects of temporal changes in connectivity. We investigated the effects of the temporal dynamics of landscape connectivity (i.e. the degree of connectivity, the magnitude and the variability of its temporal changes) over the last seven decades on current woodland plant herbaceous assemblages. The assemblages were described using a taxonomic approach combined with a functional approach based on four traits linked to the colonisation capacity of plant species. The taxonomic diversity of current woodland assemblages did not respond to the degree of connectivity nor to the magnitude and the variability of temporal changes, but the mean and/or the diversity of trait values linked to their colonisation capacity did. Responses, mainly driven by generalist species, were modulated by the type of connectivity trend experienced by woodlands. In woodlands experiencing an upward connectivity trend, high magnitude of temporal changes in connectivity increased the abundance of species that invest mostly in sexual reproduction at the expense of vegetative reproduction whereas the degree of connectivity and the variability of its temporal changes had no effect. In woodlands experiencing a downward connectivity trend, the diversity of seed mass values was independent on the magnitude but decreased with the variability of temporal changes, and increased with the degree of connectivity. Synthesis. Overall, we show that, besides the degree of connectivity, the cumulative effects of decades of changes in connectivity shape woodland plant community assembly by selecting for particular trait values in plant species. This study opens new perspectives for integrating the temporal dynamics of landscape connectivity in the theoretical framework of plant assembly rules. It should also be considered in the development of management strategies to restore and maintain landscape connectivity.

Impacts of woodland planting on nature-based recreational tourism in upland England – A case study

Upland landscapes provide important ecosystem services (ES) to society. One cultural ES– nature-based recreational tourism (NBR) – is a growing industry in upland regions that provides an important revenue to areas where other industries are often in decline. NBR tourism is a service that relies partly on the aesthetic appearance of the landscape and changes in land management, such as increasing woodland cover, changes the appearance of the landscape and may therefore have a positive or negative impact on the economic value generated by NBR tourism. We tested this query, by carrying out a survey of NBR tourists, using photo visualisation of different woodland scenarios, in a pastoral upland landscape in a UK National Park. This was conducted to estimate the economic value of NBR tourism under different woodland scenarios and participant’s preferences. The findings presented in this paper suggest that NBR tourism generates a substantial income to the area and that the economic value would not decrease, if woodland cover were to increase up to 75%. The findings also make an important observation on how there is a difference between peoples’ preference for woodland levels and the probability of return visits.

The evolutionary history of Cardamine bulbifera shows a successful rapid postglacial Eurasian range expansion in the absence of sexual reproduction.

Sexual reproduction is known to drive plant diversification and adaptation. Here we investigate the evolutionary history and spatiotemporal origin of a dodecaploid (2n = 12x = 96) Eurasian deciduous woodland species, Cardamine bulbifera, which reproduces and spreads via vegetative bulb-like structures only. The species has been among the most successful range-expanding understorey woodland plants in Europe, which raises the question of the genetic architecture of its gene pool, since its hexaploid (2n = 6x = 48) but putatively outcrossing closest relative, C. quinquefolia, displays a smaller distribution range in Eastern Europe towards the Caucasus region. Cardamine bulbifera belongs to a small monophyletic clade of four species comprising also C. abchasica (2n = 2x = 16) and C. bipinnata (unknown ploidy) from the Caucasus region. We sequenced the genomes of the two polyploids and their two putative ancestors using Illumina short-read sequencing technology (×7-8 coverage). Covering the entire distribution range, genomic data were generated for 67 samples of the two polyploids (51 samples of C. bulbifera, 16 samples of C. quinquefolia) and 6 samples of the putative diploid taxa (4 samples of C. abchasica, 2 samples of C. bipinnata) to unravel the evolutionary origin of the polyploid taxa using phylogenetic reconstructions of biparentally and maternally inherited genetic sequence data. Ploidy levels of C. bulbifera and C. quinquefolia were analysed by comparative chromosome painting. We used genetic assignment analysis (STRUCTURE) and approximate Bayesian computation (ABC) modelling to test whether C. bulbifera represents genetically differentiated lineages and addressed the hypothesis of its hybrid origin. Comparative ecological modelling was applied to unravel possible niche differentiation among the two polyploid species. Cardamine bulbifera was shown to be a non-hybridogenous, auto-dodecaploid taxon of early Pleistocene origin, but with a history of past gene flow with its hexaploid sister species C. quinquefolia, likely during the last glacial maximum in shared refuge areas in Eastern Europe towards Western Turkey and the Crimean Peninsula region. The diploid Caucasian endemic C. abchasica is considered an ancestral species, which also provides evidence for the origin of the species complex in the Caucasus region. Cardamine bulbifera successfully expanded its distribution range postglacially towards Central and Western Europe accompanied by a transition to exclusively vegetative propagation. A transition to vegetative propagation in C. bulbifera is hypothesized as the major innovation to rapidly expand its distribution range following postglacially progressing woodland vegetation throughout Europe. Preceding and introgressive gene flow from its sister species C. quinquefolia in the joint refuge area is documented. This transition and ecological differentiation may have been triggered by preceding introgressive gene flow from its sister species in the joint East European refuge areas.

Plant poisoning in goats

As herbivores goats are at risk of plant poisoning. Poisoning may occur if goats are accidentally fed plant cuttings or through contamination of feed, but as goats are agile and inquisitive they can escape from their enclosure and encounter poisonous plants in gardens or woodland. They may also eat plants they would normally avoid if other forage is unavailable. Poisoning with plants containing grayanotoxins (Pieris and Rhododendron species) or cyanogenic glycosides (e.g cherry laurel, Prunus laurocerasus) is very common in goats. Other plants that have caused poisoning in goats include yew (Taxus species), oak (Quercus species), hemlock (Conium maculatum), leylandii (× Hesperotropsis leylandii), box (Buxus sempervirens) and plants containing cardiac glycosides such as oleander (Nerium oleander) or pyrrolizidine alkaloids such as ragwort (Jacobaea vulgaris). Sudden death is frequently the first sign of plant toxicosis in livestock. Management of plant poisoning in goats is supportive including removal from exposure, and providing analgesia, rehydration and potentially a rumenotomy for plant exposure in valuable animals.

Rapid Eocene diversification of spiny plants in subtropical woodlands of central Tibet

Spinescence is an important functional trait possessed by many plant species for physical defence against mammalian herbivores. The development of spinescence must have been closely associated with both biotic and abiotic factors in the geological past, but knowledge of spinescence evolution suffers from a dearth of fossil records, with most studies focusing on spatial patterns and spinescence-herbivore interactions in modern ecosystems. Numerous well-preserved Eocene (~39 Ma) plant fossils exhibiting seven different spine morphologies discovered recently in the central Tibetan Plateau, combined with molecular phylogenetic character reconstruction, point not only to the presence of a diversity of spiny plants in Eocene central Tibet but a rapid diversification of spiny plants in Eurasia around that time. These spiny plants occupied an open woodland landscape, indicated by numerous megafossils and grass phytoliths found in the same deposits, as well as numerical climate and vegetation modelling. Our study shows that regional aridification and expansion of herbivorous mammals may have driven the diversification of functional spinescence in central Tibetan woodlands, ~24 million years earlier than similar transformations in Africa.

Mycorrhizal type of woody plants influences understory species richness in British broadleaved woodlands.

Summary Mature temperate woodlands are commonly dominated by ectomycorrhizal trees, whereas understory plants predominantly form arbuscular mycorrhizal associations. Due to differences in plant–fungus compatibility between canopy and ground layer vegetation the ‘mycorrhizal mediation hypothesis’ predicts that herbaceous plant establishment may be limited by a lack of suitable mycorrhizal fungal inoculum.We examined plant species data for 103 woodlands across Great Britain recorded in 1971 and in 2000 to test whether herbaceous plant species richness was related to the proportion of arbuscular mycorrhizal woody plants. We compared the effect of mycorrhizal type with other important drivers of woodland plant species richness.We found a positive effect of the relative abundance of arbuscular mycorrhizal woody plants on herbaceous plant species richness. The size of the observed effect was smaller than that of pH. Moreover, the effect persisted over time, despite many woodlands undergoing marked successional change and increased understorey shading.This work supports the mycorrhizal mediation hypothesis in British woodlands and suggests that increased abundance of arbuscular mycorrhizal woody plants is associated with greater understory plant species richness.