Typical Meadow Research Articles

The Verijärv area, South Estonia over the last millennium: A high resolution quantitative land-cover reconstruction based on pollen and historical data

Integration of palynological proxies with annual lamina counting, 14C, 210Pb, 137Cs and 241Am radiometric dating, historical documents and old cadastral maps enabled reconstruction of changes in the cultural landscape resulting from extensive forest clearance, arable farming and slash-and-burn practices in South Estonia over the last millennium. Changes in land-cover were quantitatively reconstructed using Landscape Reconstruction Algorithm (LRA) models. These reconstructions are in accordance with historical data from the last century, while reconstructions for the late 19th century time-slice exhibit a considerably more open landscape with a higher portion of cultivated land than that recorded on maps, and possible reasons for this discrepancy are discussed. Taxa represented in the pollen spectrum with values <1% cannot be recommended in reconstructions, as standard deviations are usually larger than the mean cover estimates of the taxon in question.Pollen data and historical evidence suggest that the forest structure changed from fairly open wooded meadow type grazed forests during early periods to closed boreal forest communities typical of the area today. Maximum landscape openness was reached in the 1700s and 1800s, when almost all of the available land was cultivated or used for cattle rearing.Four different periods of landscape development have been differentiated: AD 1000 to 1600, semi-open (20–70%) landscape with increasing intensity of agriculture and openness; AD 1600 to 1870, open (>70%) landscape resulting from extensive agrarian activities including slash-and-burn agriculture; AD 1870 to 1950, cultural landscape with variable openness (70–80%) and AD 1950 to 2000, modern overgrowing semi-open (<70%) landscape.

Pyrenean meadows in Natura 2000 network: grass production and plant biodiversity conservation

In semi-natural mountain meadows, yield and forage quality must be reconciled with plant biodiversity conservation. This study was performed to analyze the relationships between these three parameters. To quantify plant biodiversity and pastoral value (PV), phytosociological inventories were performed in 104 semi-natural meadows in the Central Spanish Pyrenees included in the Natura 2000 network. Forage yields were calculated and forage samples were analyzed for relative feed value (RFV). We identified two main types of meadows: (i) those that had “more intensive management,” relatively close to farm buildings, with little or no slope, dominated by grasses, with low plant biodiversity, high PV and yield, but low forage quality and (ii) those that had “less intensive management,” distant from farm buildings, on slopes, richer in “other forbs”, with high plant biodiversity and forage quality, but low PV and yield. Conservation policies should emphasize less intensive management practices to maintain plant diversity in the semi-natural meadows in the Pyrenees. The widespread view that “other forbs” have low nutritional value should be revised in future research. These species often are undervalued by the PV method, because their nutritional quality, digestibility and intake are poorly understood.

Lasting effects of snow accumulation on summer performance of large herbivores in alpine ecosystems may not last

One of the clearest predictions from the IPCC is that we can expect much less snow cover due to global warming in the 21st century, especially in the lower alpine areas. In alpine ecosystems, snow accumulation in depressions gives rise to distinct snow-bed vegetation types, assumed to play a key role in ecosystem function. A delayed plant phenology yields high-quality forage in late summer for wild and domestic herbivores. Yet, the mechanistic pathways for how declining snow may affect future performance of large herbivores beyond the effect of phenology remain poorly documented. Here, we link unique individual-based data on diet choice, habitat selection and performance of domestic sheep over a 10-year period to manually GPS-recorded spatial positions of snow cover in early summer (0.57% to 43.3% in snow beds on 1st of July) in an alpine ecosystem. Snowy winters gave a higher proportion of easily digestible herbs in the diet and a more variable use of snow-bed and meadow vegetation types resulting in faster growing lambs. These patterns were consistent between two density treatment levels although slightly more marked for diet at low density, suggesting that effects of simple mitigation efforts such as managing population numbers will be meagre. Our study thus yields novel insight into the strong impact of melting snow on ecosystem function in alpine habitats, which are likely to affect productivity of both domestic and wild ungulate populations.

Вплив інвазійних видів рослин на природні та напівприродні типи оселищ Закарпаття

The analysis of natural and semi-natural habitat types of the Transcarpathia for their susceptibility to invasion is presented. The impact assessment of invasive plant species on 42 habitat types in the Transcarpathia is discussed. The invasive plant species have got a negative impact on phytodiversity of eight aquatic habitat types, five – coastal, three – xerothermic, eight – meadow type, five – bush type, twelve – forest and one sand-pioneer types. These habitats are residance for 49 regionally rare plant species and 38 plant species listed in the Red Data Book of Ukraine, of which 19 species are “vulnerable”,11 have got “unvalued” protected status, five species are recognized as “rare” and three as “endangered”. The lowest impact assessment of invasive species on habitats is among alpine, bog, stream-source and rock habitat types. The checklist of natural and seminatural habitat types of the Transcarpathia threatened by invasive plant species is presented. Keywords: impact assessment, invasive plant species, habitat types, rare plant species, Transcarpathia, Ukraine.

A Comparison of Abundance and Diversity of Epiphytic Microalgal Assemblages on the Leaves of the SeagrassesPosidonia oceanica(L.) andCymodocea nodosa(Ucria) Asch in Eastern Tunisia

We studied spatial patterns in assemblages of epiphytic microalgae on the leaves of two seagrass species with different morphologies and longevity,Cymodocea nodosaandPosidonia oceanica, which cooccur in Chebba in Eastern Tunisia. Epiphyte assemblages were described for each species in summer. Epiphyte microalgal assemblages were more abundant on the leaves ofC. nodosabut more diversified on the leaves ofP. oceanica. We suggest that the differences in species composition and abundance between those seagrass species may reflect an interaction of timescales of seagrass longevity with timescales of algal reproductive biology. Short-livedC. nodosawas dominated by fast growing species such as the cyanobacteria speciesOscillatoriasp., whileP. oceanicaleaves were colonized by more mature and diversified species such as Prorocentrales. Local environmental conditions (hydrodynamics, light penetration), host characteristics (meadow type, shapes forms of leaves, life span, and growth rate), and grazing effect seem also to be responsible for these dissimilarities in epiphytic microalgae communities.

20% loss of unimproved farmland in 22 years in the Engadin, Swiss Alps

Agricultural intensification has reached mountain areas with retardation. This development is worrying as it targets some of the last remaining strongholds of traditionally farmed land in central Europe which are important hotspots of biodiversity. However, large-scale documentations of changes in agricultural habitats are rare, but are needed to guide agricultural policy for the conservation of biodiversity.We investigated vegetation changes of the agricultural landscape in a valley of the Alps (Engadin, a rather dry valley in Switzerland) between 1987/1988 and 2009/2010. In 58 plots (total area 1253ha) we recorded changes in vegetation types and the intensity of usage and we investigated correlations between these changes and site factors.By 2009/2010, all unimproved vegetation types have lost 20% of the area they covered in 1987/1988. The loss was greatest in areas where new agricultural infrastructure/reallocation projects (“ameliorations”) had been realized. This observation illustrates the potentially devastating effect of such projects for farmland biodiversity.Overall, intensively used fertile meadows (which are of limited nature value) have increased. The afflux came from the above mentioned unimproved grassland types, and not, as might be expected, from low-intensity fertile meadows (traditional hay meadows with a high nature value). In fact, the latter meadow type has seen a net gain from the intensively used fertile meadows (i.e. extensification). Both of these opposing processes (intensification and extensification) were subsidized by the government: money for infrastructure projects on the one hand and money for ecological compensation areas on the other hand.Abandonment of farmland, unlike in some other regions in the Alps, is not a general problem in the Engadin, but it did reduce the area of xerotherm grassland by 19% and of nutrient-poor meadows by 8%. Grazing, which could prevent abandonment, increased during our study period, but was mostly of high intensity, thus was not optimal from a conservation point of view. Recent contracts for nature conservation are likely to help maintain mowing and extensive grazing management on marginal land.The Engadin remains a biological hotspot and a beautiful landscape of high value for tourism. But these values are not secured as illustrated by the loss during the last 20 years. Thus, planers of irrigation and other infrastructure projects and decision-makers in general need to better incorporate both the extant nature values and their fragility into their planning.

Predictive mapping of Meadow Pipit density using integrated remote sensing data and an atlas of vascular plants dataset

Capsule The highest densities of Meadow Pipits in Central Europe are found in lowland and upland wet meadows.Aims To create a large-scale predictive model of Meadow Pipit density.Methods We analysed factors affecting the density of the Meadows Pipit in Poland using data from 777 × 1 km study plots and a set of 22 environmental variables, including agriculture intensification and habitat-specific plant species as classifiers of meadow types. Predictors were selected using variation inflation factor, then related to species density data using generalized additive models.Results The best-supported model included 11 variables and was clearly better (Akaike information criterion weight = 0.47) than other models. The density of the Meadow Pipit reaches its highest levels on large areas of extensively used wet meadows as well as pastures where livestock graze and which show high photosynthetic activity in April.Conclusion Some aspects of the environment that were not identified from remote sensing data were vital for determining relatively high density. Conservation efforts for preserving Meadow Pipit populations should focus on maintaining wet meadows and extensively grazed pastures. Given the results, the Meadows Pipit may be classified as a good indicator of traditional agriculture.

Impact of management on biodiversity-biomass relations in Estonian flooded meadows

A negative species richness-productivity relationship is often described in grasslands at smaller scales. We aimed to study the effect of management on this relationship. In particular, we addressed the relative importance of biomass cutting, hay removal and nutrient impoverishment on species richness and growth form structure. We conducted fieldwork in flooded meadows in Alam-Pedja Nature Reserve, central Estonia. We sampled vegetation in managed and abandoned stands of two types of alluvial meadows, sedge and tall forb meadow. Aboveground biomass and litter were harvested, weighed and analysed for major plant nutrients by near infrared reflectance spectroscopy. Three groups of general additive models were developed and compared, addressing the impact of (i) productivity, (ii) nutrients and (iii) management regime on species richness. Management—mowing and hay removal—reduced the amount of litter but not aboveground biomass. Management led to a decrease in nitrogen in the biomass and enhanced species richness, particularly in the tall forb meadow. The strongest determinant of species richness was the amount of litter, exhibiting a hump-shaped relationship with richness. The effect of nitrogen supply was significant, but explained less variation. Management increased the proportion of sedges in the sedge meadow and of small herbs in the tall forb meadow. We conclude that litter removal is the most important management means to support biodiversity. On highly productive sites, reducing nutrients via hay removal is of secondary importance within a timeframe of 10 years.

Gradient‐based habitat affinities predict species vulnerability to drought

Ecological fingerprints of climate change are becoming increasingly evident at broad geographical scales as measured by species range shifts and changes in phenology. However, finer-scale species-level responses to environmental fluctuations may also provide an important bellwether of impending future community responses. Here we examined changes in abundance of butterfly species along a hydrological gradient of six montane meadow habitat types in response to drought. Our data collection began prior to the drought, and we were able to track changes for 11 years, of which eight were considered mild to extreme drought conditions. We separated the species into those that had an affinity for hydric vs. xeric habitats. We suspected that drought would favor species with xeric habitat affinities, but that there could be variations in species-level responses along the hydrological gradient. We also suspected that mesic meadows would be most sensitive to drought conditions. Temporal trajectories were modeled for both species groups (hydric vs. xeric affinity) and individual species. Abundances of species with affinity for xeric habitats increased in virtually all meadow types. Conversely, abundances of species with affinity for hydric habitats decreased, particularly in mesic and xeric meadows. Mesic meadows showed the most striking temporal abundance trajectory: Increasing abundances of species with xeric habitat affinity were offset by decreasing or stable abundances of species with hydric habitat affinity. The one counterintuitive finding was that, in some hydric meadows, species with affinity for hydric habitats increased. In these cases, we suspect that decreasing moisture conditions in hydric meadows actually increased habitat suitability because sites near the limit of moisture extremes for some species became more acceptable. Thus, species responses were relatively predictable based upon habitat affinity and habitat location along the hydrological gradient, and mesic meadows showed the highest potential for changes in community composition. The implications of these results are that longer-term changes due to drought could simplify community composition, resulting in prevalence of species tolerant to drying conditions and a loss of species associated with wetter conditions. We contend that this application of gradient analysis could be valuable in assessing species vulnerability of other taxa and ecosystems.

The availability of dietary phosphorus to long yearlings and mature horses

Changes to agri-environmental policy, with an emphasis on encouraging more environmentally friendly farming practices, have been paralleled in the last two decades by a body of research into agri-environment scheme adoption. To date much of this research has considered conservation behaviour as a static issue across whole farms, and viewed participation decisions as solely a present-day issue. Based on an in-depth case study from the Peak District (UK) this paper considers the case of hay meadows—an important cultural, ecological and agricultural feature of the landscape which has been seriously threatened by changing farm practices during the last century, and which now features as a conservation option in the main agri-environment schemes. Drawing on material from semi-structured interviews on 62 farms, and participant observation on 20 farms, the paper discusses how hay meadows represent a unique case for conservation and considers the limitations of existing conceptualisations of scheme adoption for understanding hay meadow conservation. In particular, the paper examines how current conservation decisions are constrained by, and intersect with, past managements that affect the “eligibility” of meadows for scheme adoption. A model is developed which places meadow types of different eligibility against conservation styles to illustrate how different conservation scenarios are created.

Environmental fallows as a new policy tool to safeguard farmland biodiversity in Finland

A novel agri-environment scheme for Environmental Fallows (EFs) was introduced in Finland to replace a former obligatory set-aside under the Common Agricultural Policy. It currently keeps fallow at nearly 7% of the agricultural land area and therefore may make a unique contribution to the enhancement of farmland biodiversity on the national scale. Farmers can chose from four types of EF fields (game, grassland, landscape, and meadow) or their combination as long as their total annual area falls within 5–15% of the field area. We studied the biodiversity value of EF fields in three regions across Finland (n=229) based on survey data of vegetation in four fallow types. We compared EF plant communities to those of other non-cropped biotopes (margins and semi-natural grasslands) (n=99). The meadow type sown with low competitive grasses and meadow species has proven to be the most species-rich EF type, approaching the diversity level of semi-natural meadows. Vegetation of the grassland type varied considerably ranging from swards similar to those of production grasslands to ones typical for semi-natural meadows. The vegetation composition of the game and landscape types of EF differed most from the other non-cropped biotopes, and other EFs. Plant species richness in the perennial fallows correlated positively with the parcel size (through increased within-field diversity) and age, and variation in the sward height. It was negatively related to the sward’s height and density, and the reported fertility level before EF establishment. Plant species richness in EFs was not related to the forest cover in the surrounding landscape. The scheme to a greater extent than the former set-aside contributed to both the amount and diversity of non-cropped vegetation on the landscape level. The long-term efficiency of the current scheme is likely to be compromised by its untargeted and unbinding nature.

Can the Marine Ecosystem of a Posidonia oceanica Back-reef React and Defend Itself against the Spread of Caulerpa racemosa var. cylindracea?

A back-reef of Posidonia oceanica (Santa Liberata, Orbetello, Italy) subject to degradation lost its typical mixed meadow of Cymodocea nodosa , Nanozostera noltii and Caulerpa prolifera and was colonised by the invasive chlorophycea Caulerpa racemosa var. cylindracea ( C. racemosa ) between 2003 and 2004. When the submerged flora behind the P. oceanica barrier reef was studied between 2005 and 2006, C. racemosa constituted 25% of the macroalgal biomass and showed high cover (>50%). Residual dead patches of the mixed meadow had been colonized by Penicillus capitatus . By 2011, C. racemosa had fallen to about 3% of total algal mass and its cover had also dropped (5-25%), while other typical species predominated: P. oceanica dead mattes were covered by thin dense mats of photophile species dominated by Jania rubens and Cladophora sp. Periodically, the latter produced balls that floated freely on the bottom. We compared the lists of phytobenthic flora for 2005, 2006 and 2011 by explorative correspondence analysis. The 2011 list showed a 27% increase in autochthonous species. The results suggest that the invasion of allochthonous fast-spreading C. racemosa may occur in degraded ecosystems after events that altered the original community. The community can recover through a succession of vegetation changes.

Rainfall Interception by Swamp Meadow and Alpine Meadow and its Seasonal Distribution Pattern on the Qinghai-Tibet Plateau, China

In order to investigate to quantify losses by Alpine vegetation in Qinghai-Tibet Plateau, typical Swamp meadow and Alpine meadow were investigated in the growth period. The intercepting rainfall of Swamp meadow and Alpine meadow were studied by using water balance method and ANOVA statistical analysis method. The experimental results indicate that: under different coverage of Swamp meadow and Alpine meadow, rainfall interception in the growing period (June-September) both show an increasing trend. And, both the maximum rainfall interception and maximum interception rate emerge in September under different vegetation cover of Swamp meadow and Alpine meadow. However, With vegetation degeneration, interception quantity and interception rate of Swamp meadows and Alpine meadows both show decreasd trends. Interception amount and interception rate show decreased tend along with the degradation of Swamp meadow and Alpine meadow, which indicate that the degradation of meadow is unfavorable for Swamp meadow and Alpine meadow to prevent the rain landing the earth directly.

Effects of different irrigation systems on the biodiversity of species-rich hay meadows

The maintenance of traditional management practices is essential for the conservation of the biodiversity of semi-natural grasslands including species-rich hay meadows. In the canton Valais (Switzerland), hay meadows are traditionally irrigated using open water channels. However, since the 1980s, this labour intensive irrigation technique has been increasingly replaced by sprinkler irrigation. This study examined whether the different irrigation techniques (traditional vs. sprinkler) influence the local biodiversity of species-rich hay meadows. In particular, the diversity and composition of plant and gastropod species of eight traditionally irrigated meadows were compared with those of eight sprinkler-irrigated meadows. It was also assessed whether the species of either meadow type differed in functional traits. A high plant species richness was found in the meadows investigated. The study showed that the diversity and composition of plant and gastropod species of hay meadows were not affected by the change in irrigation technique 8–18 years ago. However, a lower grass/forb-ratio was observed in traditionally than in sprinkler-irrigated meadows. Furthermore, irrigation technique affected the leaf distribution and the onset of seed shedding in plants. Thus, the change in the irrigation technique altered only some aspects of biodiversity. Therefore, irrigation system alone does not represent the major factor affecting the biodiversity of hay meadows investigated.

Ostracod Assemblages in Relation to Littoral Plant Communities of a Shallow Lake (Lake Świdwie, Poland)

AbstractThe aims of this study included: specifying values of ecological parameters and Ostracoda species characteristic for different types of plant habitats occurring in lake systems, determining the impact of mud presence on the taxonomic structure and density of the ostracods, tracing seasonal changes in the structures of Ostracoda assemblages identifying the species typical of particular seasons. Various types of rushes and underwater meadows were taken into consideration as lake microhabitats. The research was conducted in the shallow Lake Œwidwie (NW Poland). Multivariate (constrained) ordination methods were used to analyse the relationships between species composition and environmental variables. In the lake and its margins 31 species of the Ostracoda were identified. The development of water vegetation during the vegetation season was conducive to growth in ostracod density. The accessibility of mud in plant habitats had a favourable effect on the general density of ostracods. Species which preferred a high mud content in their habitats included: Cypria ophtalmica, C. exsculpta and Physocypria kraepelini. Species typically encountered in underwater meadow habitats were: Cyclocypris ovum and Cypridopsis vidua. Underwater meadows of charophyte were characterized by the highest ostracod density in the whole lake system, with the average of 7860 ind. m–2 and the maximum of 17 470 ind. m–2. Species typically encountered in rush habitats included Notodromas monacha, Dolerocypris fasciata and Metacypris cordata. (© 2012 WILEY‐VCH Verlag GmbH &amp; Co. KGaA, Weinheim)

Reinforced Traditional Management is Needed to Save a Declining Meadow Species. A Demographic Analysis

The changes in agricultural practices during the last century have led to a drastic decrease in the number of traditionally managed hay meadows. Also, traditional management practices are often applied more cursorily in the remaining meadows. In combination with an increase in aerial anthropogenic nitrogen deposition, this has led to a loss of biodiversity. To investigate whether the current management is sufficient for maintaining viable populations of a typical meadow plant, Succisa pratensis, we experimentally reinforced the raking and mowing parts of the traditional management over four years in a two-by-two factorial experiment in three traditionally managed wooded hay meadows on the Baltic island of Gotland, Sweden. We found decreased litter and hay production in two of the three studied meadows as a result of our treatments. Plant sizes and asymptotic population growth rates (λ) of S. pratensis increased, particularly in plots receiving the combined raking and mowing treatment. Stochastic long-term population growth rates (λs) increased under the reinforced management: projected population sizes 50 years into the future showed a three-fold increase in raked plots and a 17-fold increase in plots that were both raked and mown. Because we found positive responses even in these seemingly well-managed meadows we conclude that it is essential that management is carried out more thoroughly to ensure viable population sizes. Our conclusion applies to most semi-natural grasslands receiving anthropogenic nitrogen, or where traditional management practices are less rigorously applied. We also suggest using biomass estimation instead of vegetation height as a measure of management strength.

Classification of mesic grasslands and their transitions of South Transdanubia (Hungary)

Classification of mesic grasslands and their transitions of South Transdanubia (Hungary) Relevés from meadows and pastures of South Transdanubia (Hungary) are evaluated by clustering and ordination methods. The relevé selection focused on the Arrhenatheretalia order but its transitions towards other types were also included. The groups of relevés are delimited and described according to differential, dominant and constant species. Ecological conditions of the groups were compared using indicator values. Nine groups were distinguished, four of them belonging strictly to the order Arrhenatheretalia. Each alliance of Arrhenatheretalia presented in the study area (Cynosurion, Arrhenatherion) was represented by two groups. Groups from these two alliances are separated along a light gradient, while groups of the same alliance differ in nutrient values. Within Cynosurion, the nutrient-poor group cannot be identified unambiguously as any syntaxa previously known from Hungary. The nutrient-rich Cynosurion meadows are similar to Lolio-Cynosuretum, however, they show a stronger relationship with wet meadows. Within Arrhenatherion, Pastinaco-Arrhenatheretum is recognised as a hay meadow of nutrient-rich soils. The other meadow type is similar to Filipendulo-Arrhenatheretum, thus raising syntaxonomical problems. There are transitional groups towards semi-dry andwet meadows, one dynamic phase and one outlier group among the other five clusters.

Realized environmental values of Environmental Fallow policy measure

A novel agri-environment scheme for Environmental Fallow (EF) was introduced in Finland to replace a former obligatory CAP set-aside. Though potentially highly valuable, the ability of the current scheme for delivering the stated objectives of water protection, biodiversity, and soil state is yet to be confirmed. The presentation evaluates the role of the scheme for protection of surface waters and biodiversity based on data from the farmer interviews, field data on vegetation, and land-use register for the regions of Uusimaa, Pohjois-Pohjanmaa and Pirkanmaa. In 2010, over 7% of the agricultural utilized area was enrolled under the scheme with four types of fields: long-term grasslands, and fields sown with meadow plants, game crops or landscape flowers. The scheme has been highly popular among farmers but requires agronomic development of the options to reduce establishment failure, and optimise management for the best environmental output with the least agronomic problems. The potential of the scheme to protect surface waters is marginal since only 10% of EFs is situated near the water courses. The option of fallowing by establishing grassland, or by enrolling existing low productive grassland, was the most popular type of EF. The most biologically valuable meadow type remains rare, and the desired vegetation composition is non stable. The vegetation composition of the EF is more diverse than that under the former set-aside and also differs from that of other non-cropped biotopes such as margins and semi-natural grasslands. Plant species diversity correlated negatively with the reported fertility level of the parcels and therefore establishing grassland and meadow fallows on the least productive parcels is ecologically justified. However, possible targeting of the options according to the landscape setting should be investigated. At the current level, the scheme has succeeded to reverse the fallowing area to its state during the EU set-aside period. However, potential long-term efficiency of the current scheme is likely to be compromised by its untargeted and unbinding nature, and existing agronomic challenges in “sowing for nature”. Without a minimum required area, the scheme totally depends on the current and forecasted profit margin.

The effectiveness of conservation measures to enhance nest survival in a meadow bird suffering from anthropogenic nest loss

The main reason for meadow bird declines is supposed to be the intensification of grassland management with earlier first harvest dates and more frequent harvests, resulting in high nest destruction rates. To increase productivity of meadow bird populations in intensified grassland areas a delay of mowing date and individual nest protection measures have been proposed. However, for ground-nesting songbirds such as the whinchat (Saxicola rubetra) the effectiveness of such measures remains widely unknown. In particular, if nest predation rate is high, measures to protect nests from agricultural destruction alone might be questionable. Here, we quantify whinchat nest survival of (1) unprotected nests situated in early mown meadows, (2) protected nests situated in early mown meadows, and (3) nests situated in late mown meadows. Analyses considered the fact that successful and unsuccessful nests are not found with equal probabilities. Periods of reduced nest survival were associated with mowing periods in the different types of meadows. In early mown meadows nest survival rates were low (S<0.1), and both conservation measures, individual nest protection and delayed mowing, resulted in significantly increased nest survival rates (S>0.7). Individual nest protection cannot avoid changes in habitat quality of intensively managed meadows, and therefore is only suitable as small-scale and short-term measure to increase nest success until a high portion of late mown meadows is established. Thus, we suggest that a combination of the two measures applied to intensified grassland fields should be provided to maintain viable sizes of endangered meadow bird populations.

Does delaying the first mowing date benefit biodiversity in meadowland?

Background: Meadows are regularly mown in order to provide fodder or litter for livestock and to prevent vegetation succession. However, the time of year at which meadows should be first mown in order to maximize biological diversity remains controversial and may vary with respect to context and focal taxa. We carried out a systematic review and meta-analysis on the effects of delaying the first mowing date upon plants and invertebrates in European meadowlands. Methods: Following a CEE protocol, ISI Web of Science, Science Direct, JSTOR, Google and Google Scholar were searched. We recorded all studies that compared the species richness of plants, or the species richness or abundance of invertebrates, between grassland plots mown at a postponed date (treatment) vs plots mown earlier (control). In order to be included in the meta-analysis, compared plots had to be similar in all management respects, except the date of the first cut that was (mostly experimentally) manipulated. They were also to be located in the same meadow type. Meta-analyses applying Hedges’d statistic were performed. Results: Plant species richness responded differently to the date to which mowing was postponed. Delaying mowing from spring to summer had a positive effect, while delaying either from spring to fall, or from early summer to later in the season had a negative effect. Invertebrates were expected to show a strong response to delayed mowing due to their dependence on sward structure, but only species richness showed a clearly significant positive response. Invertebrate abundance was positively influenced in only a few studies. Conclusions: The present meta-analysis shows that in general delaying the first mowing date in European meadowlands has either positive or neutral effects on plant and invertebrate biodiversity (except for plant species richness when delaying from spring to fall or from early summer to later). Overall, there was also strong between-study heterogeneity, pointing to other major confounding factors, the elucidation of which requires further field experiments with both larger sample sizes and a distinction between taxon-specific and meadow-type-specific responses.