Aleksi Lehikoinen

Aleksi Lehikoinen
University of Helsinki | HY · Finnish Museum of Natural History

PhD

About

196
Publications
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5,215
Citations

Publications

Publications (196)
Article
Full-text available
Protected areas are a cornerstone for biodiversity conservation, and typically support more natural and undisturbed habitats compared to unprotected lands. The effect of protected areas on intra-specific ecological niche has been rarely investigated. Here, we explore potential differences in ecological niche properties of birds and mammals across p...
Article
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Climatic warming is forcing species to shift their ranges poleward, which has been demonstrated for many taxa globally. Yet, the influence of habitat types on within- and among-species variations of distribution shifts has rarely been studied, especially during the non-breeding season. Here, we investigated habitat-specific shift distances of north...
Article
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The recovery of the Baltic White-tailed Eagle Haliaeetus albicilla population since the 1980s is a conservation success story. However, the re-establishment of this predator in coastal and lake areas appears to affect Great Cormorants Phalacrocorax carbo during the breeding season. We collated published and unpublished records of White-tailed Eagle...
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Great Cormorants Phalacrocorax carbo in the eastern Baltic are expanding in numbers. Eight colonies in Estonia, Finland and the Russian Federation were investigated in 2007. Brood size and condition of large nestlings were determined and indicate that food provisioning was not a limiting factor. Food items consisted of both pelagic and benthic prey...
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The relationships between species abundance or occurrence versus spatial variation in climate are commonly used in species distribution models (SDMs) to forecast future distributions. Under “space‐for‐time‐substitution”, the effects of climate variation on species are assumed to be equivalent in both space and time. Two unresolved issues of space‐f...
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Climate change is a pervasive threat to biodiversity. While range shifts are a known consequence of climate warming contributing to regional community change, less is known about how species’ positions shift within their climatic niches. Furthermore, whether the relative importance of different climatic variables prompting such shifts varies with c...
Preprint
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Climate change alters ecological communities through effects on individual species and interactions between species. The impacts of climate change may be buffered by community diversity: diverse communities may be more resistant to climate-driven perturbations than simple communities. Here, we assess how diversity influences long-term thermal niche...
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Certain species experience rapid population increases in human-modified and -affected environments. Conservation actions and increased wintertime food availability have led to a population increase of several large herbivorous waterbird species. In Northern Europe, this trend is opposite to the overall decrease of several smaller waterbird species....
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Climate change is pushing species ranges and abundances towards the poles and mountain tops. Although many studies have documented local altitudinal shifts, knowledge of general patterns at a large spatial scale, such as a whole mountain range, is scarce. From a conservation perspective, studying altitudinal shifts in wildlife is relevant because m...
Preprint
Climate change can facilitate emergence of zoonotic and wildlife diseases, by changing environmental suitability for hosts, ectoparasites, and pathogens. However, the connections between climatic variables and diseases remains equivocal. We compiled a systematic database for the prevalence of 121 pathogenic microbial taxa in birds and bats, includi...
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In order to understand species’ sensitivity to habitat change, we must correctly determine if a species is associated with a habitat or not, and if it is associated, its degree of specialization for that habitat. However, definitions of species’ habitat association and specialization are often static, categorical classifications that coarsely defin...
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Wetland bird species have been declining in population size worldwide as climate warming and land-use change affect their suitable habitats. We used species distribution models (SDMs) to predict changes in range dynamics for 64 non-passerine wetland birds breeding in Europe, including range size, position of centroid, and margins. We fitted the SDM...
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Population sizes of many birds are declining alarmingly and methods for estimating fluctuations in species' abundances at a large spatial scale are needed. The possibility to derive indicators from the tendency of specific species to co-occur with others has been overlooked. Here, we tested whether the abundance of resident titmice can act as a gen...
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Aim: Abundances of animals vary according to species-specific habitat selection, but habitats are undergoing rapid change in response to anthropogenic alterations of land use and climate. The long-term decline of snowfall is one of the most dramatic abiotic changes in boreal regions, with potential to alter species communities and shape future eco...
Article
Population performance is predicted to be more strongly influenced by detrimental species interactions such as predation under benign climatic conditions, and by climate forcing under harsh conditions, reflected in geographical gradients in biotic interaction strength. Less appreciated is the potential for site-specific changes in drivers with the...
Preprint
Full-text available
Climatic warming is forcing numerous species to shift their ranges poleward, which has been demonstrated for many taxa across the globe. Yet, the influence of habitat types on within- and among-species variations of distribution shifts has rarely been studied, especially so for the non-breeding season. Here, we investigated habitat specific shift d...
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Tässä mietinnössä Luontopaneeli keskittyy Suomen pinta-alaltaan suurimman ja siten lajien kannalta merkityksellisimmän elinympäristön eli boreaalisten metsien suojelun kohdentamiseen. EU:n BD-strategiassa mainitut käsitteet vanha metsä ja luonnontilainen metsä eivät ole yksiselitteisiä, ja niiden määritelmiin voidaan perustellusti esittää erilaisia...
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Natural sounds, and bird song in particular, play a key role in building and maintaining our connection with nature, but widespread declines in bird populations mean that the acoustic properties of natural soundscapes may be changing. Using data-driven reconstructions of soundscapes in lieu of historical recordings, here we quantify changes in soun...
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Suomen alkuperäisestä 10,4 miljoonan hehtaarin suoalasta yli puolet on ojitettu metsä- ja maatalouden sekä turvetuotannon tarpeisiin. Etelä-Suomessa ojitus on ollut voimakkainta: keskimäärin noin 75 prosenttia ja monin paikoin vielä suurempi osa soista on ojitettu. Suot ovat Euroopan luontotyypeistä kaikkein uhanalaisin luontotyyppiryhmä ja Suomell...
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Ectoparasites such as louse flies (Diptera: Hippoboscidae) have tendency for host specialization, which is driven by adaptation to host biology as well as competition avoidance between parasites of the same host. However, some louse fly species, especially in genera attacking birds, show wide range of suitable hosts. In the presented study, we have...
Preprint
Full-text available
Climate warming is driving changes in species distributions, although many species show a so-called climatic debt, where their range shifts lag behind the fast shift in temperature isoclines. Protected areas (PAs) may impact the rate of distribution changes both positively and negatively. At the cold edges of species distributions, PAs can facilita...
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Sanna Marinin hallitus on sitoutunut luonnon monimuotoisuuden tilan parantamiseen ja luontokadon pysäyttämiseen. Lupaus on äärimmäisen tärkeä. Luonnon ekosysteemien heikennys uhkaa elintärkeiden eko-systeemipalveluiden tuotantoa sekä ihmisten terveyttä, hyvinvointia ja turvallisuutta. Maailman talousfoorumi on nostanut luontokadon viiden vakavimman...
Preprint
Climate change is pushing species ranges towards poles and mountain tops. Although many studies have documented local altitudinal shifts, knowledge of general patterns at a large spatial scale, such as a whole mountain range, is very limited. From a conservation perspective, studying altitudinal shifts is particularly important as mountain regions...
Article
Full-text available
Around fifteen thousand fieldworkers annually count breeding birds using standardized protocols in 28 European countries. The observations are collected by using country-specific and standardized protocols, validated, summarized and finally used for the production of continent-wide annual and long-term indices of population size changes of 170 spec...
Article
Full-text available
Around fifteen thousand fieldworkers annually count breeding birds using standardized protocols in 28 European countries. The observations are collected by using country-specific and standardized protocols, validated, summarized and finally used for the production of continent-wide annual and long-term indices of population size changes of 170 spec...
Preprint
Full-text available
Understanding the variation in community composition and species abundances, i.e., β-diversity, is at the heart of community ecology. A common approach to examine β-diversity is to evaluate directional turnover in community composition by measuring the decay in the similarity among pairs of communities along spatial or environmental distances. We p...
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Suomi on toistaiseksi selvinnyt koronaviruksen (COVID-19) aiheuttamasta kriisistä taloudellisesti verrokkimaita paremmin, mutta työllisyystilanne on silti heikentynyt ympäri maata ja talouden ennustetaan supistuvan noin 4,7 prosenttia vuonna 20201. Negatiivisten talousvaikutusten minimoimiseksi hallitus on suuntaamassa EU:n elpymisvälineestä varoja...
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Wildlife conservation policies directed at common and widespread, but declining, species are difficult to design and implement effectively, as multiple environmental changes are likely to contribute to population declines. Conservation actions ultimately aim to influence demographic rates, but targeting actions towards feasible improvements in thes...
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Environmental Impact Assessments (EIAs) that are applied in the planning phases of large land-use and construction projects are aimed at aiding decision-making and mitigating significant environmental impacts. In light of the global biodiversity crisis, conducting high-quality biodiversity impact assessments is important, as biodiversity informatio...
Preprint
Full-text available
Ectoparasites such as louse flies (Diptera: Hippoboscidae) have tendency for host specialization, which is driven by adaptation to host biology as well as competition avoidance between parasites of the same host. However, some louse fly species, especially in genera attacking birds, show wide range of suitable hosts. In the presented study, we have...
Article
Full-text available
Millions of bird observations have been entered on online portals in the past 20 years either as checklists or arbitrary individual entries. While several hundred publications have been written on a variety of topics based on bird checklists worldwide, unstructured non-checklist observations have received little attention and praise by academia. In...
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1. Global climate change is driving species’ distributions towards the poles and mountain tops during both non‐breeding and breeding seasons, leading to changes in the composition of natural communities. However, the degree of season differences in climate‐driven community shifts has not been thoroughly investigated at large spatial scales. 2. We c...
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Climate change has ubiquitous impacts on ecosystems and threatens biodiversity globally. One of the most recognized impacts are redistributions of species, a process which can be hindered by habitat degradation. Protected areas (PAs) have been shown to be beneficial for preserving and reallocating species occurrences under climate change. Yet, stud...
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The current loss of biodiversity has been broadly acknowledged as the main cause of ecosystem change. To halt this trend, several international agreements have been made, and various biodiversity metrics have been developed to evaluate whether the targets of these agreements are being met. The process of developing good indicators is not trivial. I...
Article
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Climate warming is driving changes in species distributions and community composition. Many species show a so-called climatic debt, where shifts in range have lagged behind faster shifts in temperature isoclines. Inside protected areas (PAs), community changes in response to climate warming can be facilitated by greater colonization rates by warm-d...
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Migration has evolved to tackle temporal changes in availability of resources. Climate change has been shown to affect the migration dates of species, which raises the question of whether the variation in the timing of migration is climate or resource dependent? The relative importance of temperature and availability of food as drivers of migration...
Article
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Significance The changing climate is causing shifts in the timing of species activity. We use data on over 820,000 nesting records to quantify changes in the beginning, end, and duration of breeding among boreal birds. In addition to a general advance of breeding, we find an overall contraction of the breeding period. This pattern was most common a...
Article
The European Union's Natura 2000 (N2000) is among the largest international networks of protected areas. One of its aims is to secure the status of a predetermined set of (targeted) bird and butterfly species. However, nontarget species may also benefit from N2000. We evaluated how the terrestrial component of this network affects the abundance of...
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Migratory waterbirds require an effectively conserved cohesive network of wetland areas throughout their range and life-cycle. Under rapid climate change, protected area (PA) networks need to be able to accommodate climate driven range shifts in wildlife if they are to continue to be effective in the future. Thus, we investigated geographical varia...
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The Common Crane (Grus grus) population has experienced an unprecedented increase across Europe during the last decades. Although cranes feed mostly on invertebrates, amphibians and berries during the breeding season, they can also eat eggs and young of other birds. Therefore, conservationists have raised concerns about the potential predatory effe...
Article
Protected areas (PAs) should maintain populations of focal species, but their ability to achieve this target is affected both by land use outside PAs and by climate warming. To study effects of land use on species and ability of PAs to maintain populations of species, we compared trends in abundance of 15 resident bird species between two periods o...
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Internationally coordinated censuses of Whooper Swans Cygnus cygnus across continental northwest Europe were undertaken in mid-winter 1995, 2000, 2005, 2010 and 2015. The estimate of 138,500 birds in 2015, the highest to date, represented a more than doubling of the population size (at an annual increase of 4.1%) since the first census total of 59,...
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Camouflage may promote fitness of given phenotypes in different environments. The tawny owl (Strix aluco) is a color polymorphic species with a gray and brown morph resident in the Western Palearctic. A strong selection pressure against the brown morph during snowy and cold winters has been documented earlier, but the selection mechanisms remain un...
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The greatest loss of biodiversity in the EU has occurred on agricultural land. The Common Starling (Sturnus vulgaris) is one of the many numerous and widespread European farmland breeding bird species showing major population declines linked to European agricultural intensification. Here we present results based on monitoring data collected since 1...
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Joint Species Distribution Modelling (JSDM) is becoming an increasingly popular statistical method for analyzing data in community ecology. Hierarchical Modelling of Species Communities (HMSC) is a general and flexible framework for fitting JSDMs. HMSC allows the integration of community ecology data with data on environmental covariates, species t...
Article
Full-text available
The greatest loss of biodiversity in the EU has occurred on agricultural land. The Common Starling (Sturnus vulgaris) is one of the many numerous and widespread European farmland breeding bird species showing major population declines linked to European agricultural intensification. Here we present results based on monitoring data collected since 1...
Article
Full-text available
’Notebook’ is one of the primary data management systems of the Finnish Biodiversity Information Facility (FinBIF). It is a web solution for recording opportunistic as well as sampling-event-based species observations. It is being used for systematic monitoring schemes, various citizen science projects, and platforms for species enthusiasts. Notebo...
Chapter
Climate variability drives many aspects of the ecology of species directly or indirectly through changes in habitat type and structure, and thus long-term climatic variability has been thought to be the key determinant of community structure and change at large spatial scales. We review potential and reported impacts of climate change on shifts in...
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Numerous studies over the past decades have shown that species phenologies are shifting. Behind the large-scale patterns of shifting phenologies lies, however, large variability across species and space in terms of both the sign of the shifts (advance or delay) and their magnitude (rate of change). The shifts in the timing of seasonal events are us...
Article
Bird populations are in continuous change in the Finnish archipelago. Some species are increasing in abundance but more are decreasing. More than half of the species, the main breeding area of which is in the archipelago, are currently red-listed in the most recent Red Data Book of Finnish bird species (Lehikoinen et al. 2019). We present short-ter...
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Monitoring of bird populations is based primarily on volunteer birdwatcher activity in Finland. Hence, development of online user interfaces and data availability have become a priority in order to encourage bird watchers to participate in monitoring schemes. Most Finnish bird monitoring is managed by the Finnish Museum of Natural History LUOMUS, w...
Article
Capsule The first European Bird Census Council (EBCC) Atlas of European Breeding Birds has been widely used in scientific publications. Aims To quantify how scientific publications have used data from the first European Bird Census Council (EBCC) Atlas of European Breeding Birds, what the topics of these studies have been, and to identify key aspe...