| 1. |
- Arlt, Debora
(författare)
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Att inventera en standardrutt
- 2019
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Ingår i: Fåglar i Uppland. - 0349-3911. ; 46, s. 15-19
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Tidskriftsartikel (populärvet., debatt m.m.)abstract
- Varför inventera en standardrutt? Svaret är inte helt givet. Jag ska gå upp tidigt, ta mig till en plats som jag inte valt själv och det kan bli jobbigt terräng eftersom jag ska ta mig längs en förbestämd rutt genom landskapet och skogen oavsett om det finns vägar eller inte. Det kan bli blött, det kan bli halt, det kan bli svettigt och myggigt. Men det kan också bli en oväntad observation. Och den där utmaningen att ta reda på hur det ser ut på en slumpvis valt plats mitt i Uppland. Kanske upptäcka något nytt. Sedan blir saken inte sämre av att med mina observationer kunna bidra till kunskap om tillståndet för svenska fåglar.
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| 2. |
- Arlt, Debora
(författare)
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Därför gillar vi göktytan!
- 2016
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Ingår i: Fåglar i Uppland. - 0349-3911. ; , s. 24-32
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Tidskriftsartikel (populärvet., debatt m.m.)abstract
- Göktytan kan med fog betecknas som en av de mer säregna representanterna för den uppländska fågelfaunan. Debora Arlt har under flra år varit engagerad i ett holkprojekt som bedrivs runt Uppsala och berättar här om sina och kollegornas erfarenheter.
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| 3. |
- Arlt, Debora, et al.
(författare)
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Effect of Geolocators on Migration and Subsequent Breeding Performance of a Long-Distance Passerine Migrant
- 2013
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Ingår i: PLoS ONE. - : Public Library of Science (PLoS). - 1932-6203. ; 8
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Tidskriftsartikel (refereegranskat)abstract
- Geolocators are small light-weight data loggers used to track individual migratory routes, and their use has increasedexponentially in birds. However, the effects of geolocators on individual performance are still poorly known. Westudied geolocator effects on a long-distance migrating passerine bird, the northern wheatear (Oenanthe oenantheL.). We asked the general question of whether geolocators affect migratory behaviour and subsequent reproductiveperformance of small passerines by comparing arrival time, breeding time, breeding success and survival ofgeolocator versus control birds of known identity and breeding history. During two years geolocator birds (n=37)displayed a lower apparent survival (30%) as compared to controls (45%, n=164). Furthermore, returning geolocatorbirds (n=12) arrived on average 3.5 days later, started laying eggs 6.3 days later, and had lower nest success (25%)than control birds (78%). Our results suggest that geolocators affect migratory performance with carry-over effects tothe timing of breeding and reproductive success in the subsequent breeding season. We discuss the implications ofsuch geolocator effects for the study of migratory strategies of small passerines in general and suggest how toidentify and investigate such effects in the future.
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| 4. |
- Arlt, Debora
(författare)
-
Följ årstiderna med Fågelkalendern
- 2016
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Ingår i: Fåglar i Uppland. - 0349-3911. ; , s. 16-21
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Tidskriftsartikel (populärvet., debatt m.m.)abstract
- Våren 2017 startar Fågelkalendern som en del i Naturens Kalender. Fågelintresserade i hela Sverige kan hjälpa till att dokumentera vårtecken och samla in andra fenologiska data på ett standardiserat sätt. Projektet drivs av SLU, Sveriges lantbruksuniversitet, i samarbete med SOF - BirdLife Sverige och Artportalen.
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| 5. |
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| 6. |
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| 7. |
- Arlt, Debora, et al.
(författare)
-
Indikatorer för småbiotoper i odlingslandskapet
- 2019
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Rapporten presenterar förslag till indikatorer för miljökvalitetsmålet Ett rikt odlingslandskap. Indikatorerna ska åskådliggöra tillstånd och förändringar för småbiotoper vid åkermark, baserat på dataunderlag från nationell och regional miljöövervakning. Två huvudsakliga indikatorer presenteras, med olika möjligheter till fördjupning beroende på syfte.Den första indikatorn avser mängd av småbiotoper, totalt eller uppdelat på olika småbiotopstyper. Denna indikator fokuserar på fyra typer av linjära landskapselement: stenmurar, breda diken, markvägar samt vegetationsremsor och mindre diken mellan åkerfält. Skälen är dels att det är tydligt och beräkningsmässigt fördelaktigt att indikatorn kan presenteras som ett längdbaserat mått, dels att det är fyra relativt vanligt förekommande typer som tillsammans fångar in en bredd och variation av landskapselement, med stor relevans för både kultur- och naturvärden i landskapet. Det finns också möjlighet att få information om träd- och busktäckning på landskapselementen.Den andra indikatorn beskriver mångfald av småbiotoper och inkluderar en mycket bredare grupp av landskapselement och strukturer vid åkerkanter. Förutom en något mer detaljerad indelning av linjära landskapselement, så ingår även åkerholmar, småvatten, skyddsvärda träd och bärande träd och buskar. Denna indikator kan presenteras som både rikedom (antal typer) och diversitet (Shannons diversitetsindex, som väger samman antalet typer och hur jämn mängdfördelningen är mellan typer) av småbiotoper inom ett landskapsavsnitt (rutor). Eftersom detta mått är skalberoende, så bör storleken på rutorna anpassas så att skillnader mellan områden och förändringar i tiden framgår som bäst. Förslagsvis presenteras rikedom för 1 x 1 km stora rutor och diversitet för 3 x 3 km stora rutor.Den första, mängdbaserade indikatorn är anpassad för att presenteras rikstäckande, där data från linjekorsningsinventeringen i det nationella miljöövervakningsprogrammet NILS används. Mer utförliga data finns i det regionala delprogrammet för småbiotoper i åkerlandskapet inom Remiil, men endast för 11 län. Remiils data används dels för en fördjupad version av den första indikatorn i Syd- och Mellansverige, dels för mångfaldsindikatorn, som alltså bara kan tas fram för dessa 11 län. I dessa 11 län går det också att göra fördjupningar av resultaten genom att till exempel dela in småbiotoperna i ekologiskt funktionella grupper, biotopskyddade småbiotoper, småbiotoper med högt kulturmiljövärde och skötselberoende småbiotoper. För beräkningen av mångfaldsindex standardiseras data till medelvärde delat med standardavvikelse, vilket gör det möjligt att jämföra och summera småbiotoper med olika geografisk utsträckning (polygoner/area, linjeobjekt/längd och punkter/antal). I rapporten presenteras huvuddragen för de databearbetningar och beräkningar som behövs, liksom de arbetsmoment som behövs för inledande förberedelser och för löpande rapportering. Slutligen presenteras en enkät där experter anger relevansen av denna typ av mått för olika organismgrupper i jordbrukslandskapet.
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| 8. |
- Arlt, Debora, et al.
(författare)
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Marked reduction in demographic rates and reduced fitness advantage for early breeding is not linked to reduced thermal matching of breeding time
- 2017
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Ingår i: Ecology and Evolution. - : Wiley. - 2045-7758. ; 7, s. 10782-10796
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Tidskriftsartikel (refereegranskat)abstract
- Warmer springs may cause animals to become mistimed if advances of spring timing, including available resources and of timing of breeding occur at different speed. We used thermal sums (cumulative sum of degree days) during spring to describe the thermal progression (timing) of spring and investigate its relationship to breeding phenology and demography of a long-distant migrant bird, the northern wheatear (Oenanthe oenanthe L.). We first compare 20-year trends in spring timing, breeding time, selection for breeding time, and annual demographic rates. We then explicitly test whether annual variation in selection for breeding time and demographic rates associates with the degree of phenological matching between breeding time and thermal progression of spring. Both thermal progression of spring and breeding time of wheatears advanced in time during the study period. But despite breeding on average 7days earlier with respect to date, wheatears bred about 4days later with respect to thermal spring progression. Over the same time period, selection for breeding time changed from distinct within-season advantage of breeding early to no or very weak advantage. Furthermore, demographic rates (nest success, fledgling production, recruitment, adult survival) and nestling weight declined markedly by 16%-79%. Those temporal trends suggest that a reduced degree of phenological matching may affect within-season fitness advantage of early breeding and population demographic rates. In contrast, when we investigate links based on annual variation, we find no significant relationship between either demographic rates or fitness advantage of early breeding with annual variation in the degree of phenological matching. Our results show that corresponding temporal trends in phenological matching, selection for breeding time and demographic rates are inconclusive evidence for demographic effects of changed phenological matching. Instead, we suggest that the trends in selection for breeding time and demographic rates are due to a general deterioration of the breeding environment.
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| 9. |
- Arlt, Debora, et al.
(författare)
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Prolonged stopover duration characterises migration strategy and constraints of a long-distance migrant songbird
- 2015
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Ingår i: Animal Migration. - : Walter de Gruyter GmbH. - 2084-8838. ; 2, s. 47-62
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Tidskriftsartikel (refereegranskat)abstract
- Stopover behaviour is a central element ofmigration strategies. But in recent geolocator studies,despite now being able to track individual songbirdsduring their entire migration, their stopover behaviourhas received little attention. We used light-sensitivegeolocators to identify the migratory routes and schedulesof 12 northern wheatears (Oenanthe oenanthe) breedingin Sweden. Three geolocators collected temperature datacomplementing inferences from light data by providingadditional information on behaviour during migration.The wheatears performed a slow migration withconsiderable stopover time (84%/76% of autumn/springmigration), with short stops while traveling throughEurope, and a prolonged stopover period in both autumnand spring in the Mediterranean region. Spring migrationwas faster than autumn migration, mainly because ofdecreased stopover time. Migration routes and timeschedules were similar to those from a German breedingpopulation. Compared to wheatears breeding in Alaskawith a three-fold migration distance, Swedish wheatearsspent more time during stopovers during autumn andspring migration, suggesting less time constraints andpotential flexibility in migration schedules. The findingof prolonged stopovers, similar to other recent geolocatorstudies, shows that temporary residency periods maybe common. This changes our current view on stopoverecology to one where temporary residency periods arepart of spatio-temporal strategies optimising resource useduring the entire annual cycle.
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| 10. |
- Arlt, Debora, et al.
(författare)
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Proximate causes of avian protandry differ between subspecies with contrasting migration challenges
- 2016
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Ingår i: Behavioral Ecology. - : Oxford University Press (OUP). - 1045-2249 .- 1465-7279. ; 27, s. 321-331
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Tidskriftsartikel (refereegranskat)abstract
- In many migratory birds, males precede females during migration and arrival at the breeding sites. Three proximate mechanisms are proposed to explain this phenomenon of protandry: males 1) winter closer to breeding sites, 2) start spring migration earlier, and/or 3) migrate faster than females. So far, the relative contribution of these mechanisms to protandry is unknown. The present study investigated the importance of each of the 3 proximate mechanisms of protandry for a songbird migrant wintering in Africa, the northern wheatear (Oenanthe oenanthe). Two subspecies co-occur in Europe on migration, of which the leucorhoa northern wheatears breeding from Iceland to Canada have to cross the North Atlantic, whereas the nominate form breeding in Europe does not face any significant sea barrier. We show that the leucorhoa subspecies had a significantly higher degree of protandry at stopover sites across Europe than the oenanthe subspecies (-6 vs. -2 days). Leucorhoa northern wheatear's higher degree of protandry was associated with a larger age effect, in which old males preceded young males, and greater sex-specific differences in wing shape and refueling yielding higher migration speeds in males than females. In oenanthe northern wheatears, light-level geolocators revealed that males did not winter closer to the breeding sites or migrate faster than females, but initiated spring migration earlier. Our results demonstrate that the significance of the mechanisms causing protandry can differ between related taxa and highlight the importance of the advancement in male arrival date with age as a potential factor shaping the degree of protandry.
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| 11. |
- Arlt, Debora
(författare)
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RESEARCH NEEDS AND RECOMMENDATIONS FOR THE USE OF CONSPECIFIC-ATTRACTION METHODS IN THE CONSERVATION OF MIGRATORY SONGBIRDS
- 2010
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Ingår i: Condor. - : Oxford University Press (OUP). - 0010-5422. ; 112, s. 252-264
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Tidskriftsartikel (refereegranskat)abstract
- Numerous studies have confirmed that when selecting habitat birds can use social information acquired from observing other individuals, and many aspects of this social information can be capitalized upon to manage bird populations. The conservation implications of attraction to conspecifics are especially promising for management, and as research progresses it is important to consider how this behavior can be applied to conservation practice. The biological underpinnings of conspecific attraction and the repercussions of manipulating species' distributions with attraction methods are not well understood, but conservation decisions often cannot wait for scientific research. Here we synthesize the current research on manipulation of songbirds by conspecific-attraction methods and review our knowledge gaps critically. We reviewed the published literature on conspecific-attraction experiments in songbirds and found that of 24 studies in which they were attempted, 20 were successful in attracting birds. Although many experiments have been successful in attracting conspecifics with various cues, we outline issues to be considered before songbirds are manipulated by attraction methods, and we highlight areas of research necessary to enhance the understanding of conspecific attraction and its use in conservation.
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| 12. |
- Arlt, Debora
(författare)
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Stenskvättor mellan två världar
- 2013
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Ingår i: Fåglar i Uppland. - 0349-3911. ; 40, s. 8-13
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Annan publikation (populärvet., debatt m.m.)
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| 13. |
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| 14. |
- Arlt, Debora
(författare)
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Tornseglaren och längtan
- 2017
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Ingår i: Fåglar i Uppland. - 0349-3911. ; , s. 20-23
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Tidskriftsartikel (populärvet., debatt m.m.)
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| 15. |
- Arlt, Debora
(författare)
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Tornseglarprojektet i Uppsala
- 2018
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Ingår i: Fåglar i Uppland. - 0349-3911. ; 45, s. 38-42
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Tidskriftsartikel (populärvet., debatt m.m.)
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| 16. |
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| 17. |
- Arlt, Debora, et al.
(författare)
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Weak effects of geolocators on small birds: A meta-analysis controlled for phylogeny and publication bias
- 2020
-
Ingår i: Journal of Animal Ecology. - : Wiley. - 0021-8790 .- 1365-2656. ; 89, s. 207-220
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Tidskriftsartikel (refereegranskat)abstract
- Currently, the deployment of tracking devices is one of the most frequently used approaches to study movement ecology of birds. Recent miniaturization of light-level geolocators enabled studying small bird species whose migratory patterns were widely unknown. However, geolocators may reduce vital rates in tagged birds and may bias obtained movement data. There is a need for a thorough assessment of the potential tag effects on small birds, as previous meta-analyses did not evaluate unpublished data and impact of multiple life-history traits, focused mainly on large species and the number of published studies tagging small birds has increased substantially. We quantitatively reviewed 549 records extracted from 74 published and 48 unpublished studies on over 7,800 tagged and 17,800 control individuals to examine the effects of geolocator tagging on small bird species (body mass <100 g). We calculated the effect of tagging on apparent survival, condition, phenology and breeding performance and identified the most important predictors of the magnitude of effect sizes. Even though the effects were not statistically significant in phylogenetically controlled models, we found a weak negative impact of geolocators on apparent survival. The negative effect on apparent survival was stronger with increasing relative load of the device and with geolocators attached using elastic harnesses. Moreover, tagging effects were stronger in smaller species. In conclusion, we found a weak effect on apparent survival of tagged birds and managed to pinpoint key aspects and drivers of tagging effects. We provide recommendations for establishing matched control group for proper effect size assessment in future studies and outline various aspects of tagging that need further investigation. Finally, our results encourage further use of geolocators on small bird species but the ethical aspects and scientific benefits should always be considered.
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| 18. |
- de Villemereuil, Pierre, et al.
(författare)
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Fluctuating optimum and temporally variable selection on breeding date in birds and mammals
- 2020
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Ingår i: Proceedings of the National Academy of Sciences of the United States of America. - : NATL ACAD SCIENCES. - 0027-8424 .- 1091-6490. ; 117:50, s. 31969-31978
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Tidskriftsartikel (refereegranskat)abstract
- Temporal variation in natural selection is predicted to strongly impact the evolution and demography of natural populations, with consequences for the rate of adaptation, evolution of plasticity, and extinction risk. Most of the theory underlying these predictions assumes a moving optimum phenotype, with predictions expressed in terms of the temporal variance and auto-correlation of this optimum. However, empirical studies seldom estimate patterns of fluctuations of an optimum phenotype, precluding further progress in connecting theory with observations. To bridge this gap, we assess the evidence for temporal variation in selection on breeding date by modeling a fitness function with a fluctuating optimum, across 39 populations of 21 wild animals, one of the largest compilations of long-term datasets with individual measurements of trait and fitness components. We find compelling evidence for fluctuations in the fitness function, causing temporal variation in the magnitude, but not the direction of selection. However, fluctuations of the optimum phenotype need not directly translate into variation in selection gradients, because their impact can be buffered by partial tracking of the optimum by the mean phenotype. Analyzing individuals that reproduce in consecutive years, we find that plastic changes track movements of the optimum phenotype across years, especially in bird species, reducing temporal variation in directional selection. This suggests that phenological plasticity has evolved to cope with fluctuations in the optimum, despite their currently modest contribution to variation in selection.
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| 19. |
- Glimskär, Anders, et al.
(författare)
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Resultat från regional miljöövervakning av småbiotoper, gräsmarker och myrar 2009–2014
- 2016
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- ”Regional miljöövervakning i landskapsrutor” karterar och följer upp småbiotoper, gräsmarker och våtmarker inom tre så kallade gemensamma delprogram:Småbiotoper i åkerlandskapetGräsmarkernas gröna infrastrukturVegetation och ingrepp i våtmarkerI den här rapporten presenterar vi ett urval av resultat från det första inventeringsvarvet 2009-2014. Totalt har nio län i södra Sverige ingått i området som inventerats. Inför SLU:s arbete med analyserna har representanter från länsstyrelserna i samarbete med SLU, prioriterat vilka resultat för småbiotoper, gräsmarker och myrar som är mest angelägna att lyfta fram. SLU gjorde också en bedömning av vilka av länsstyrelsernas önskemål om analyser som var möjliga att tillgodose inom ramen för detta projekt. Huvuddelen av de resultat som presenteras i denna rapport baseras på data insamlade i fält. Underlaget för att styra fältinventeringen har varit polygonskikt framtagna genom flygbildstolkning i infraröda flygbilder.
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| 20. |
- Glimskär, Anders, et al.
(författare)
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Resultat för småbiotoper, gräsmarker och myrar i regional miljöövervakning 2009-2014
- 2016
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- "Regional miljöövervakning i landskapsrutor" karterar och följer upp småbiotoper, gräsmarker ochvåtmarker inom tre så kallade gemensamma delprogram:· Småbiotoper i åkerlandskapet· Gräsmarkernas gröna infrastruktur· Vegetation och ingrepp i våtmarkerI den här rapporten presenterar vi ett urval av resultat från det första inventeringsvarvet 2009-2014.Totalt har nio län i södra Sverige ingått i området som inventerats. Inför SLU:s arbete med analysernahar representanter från länsstyrelserna i samarbete med SLU, prioriterat vilka resultat för småbiotoper,gräsmarker och myrar som är mest angelägna att lyfta fram. SLU gjorde också en bedömning av vilkaav länsstyrelsernas önskemål om analyser som var möjliga att tillgodose inom ramen för detta projekt.Huvuddelen av de resultat som presenteras i denna rapport baseras på data insamlade i fält. Underlagetför att styra fältinventeringen har varit polygonskikt framtagna genom flygbildstolkning i infrarödaflygbilder.För småbiotoper presenteras bland annat resultat om mängd, längd, olika skötselaspekter samtförekomst av blommande/bärande träd och buskar och skyddsvärda träd. För gräsmarker presenterasmängd av olika gräsmarkstyper, variabler som indikerar hävd och skötseleffekter samtartsammansättning. För myrar presenteras areal myr och areal skyddsvärda naturtyper, vegetation samti viss mån ingrepp och störningspåverkan. Förutom att ge underlag för presentationer av resultat, haranalysarbetet inneburit en utvärdering av den metodik vi använt. Inventeringen av småbiotoper har visatsig ge bra dataunderlag för våra frågeställningar. För att få bättre skattningar för både gräsmarker ochvåtmarker hade det varit önskvärt med fler fältprovytor, något som vi lagt till i dessa delprogram från2015. Utvärderingen av data från övervakningen av våtmarker visar också på behovet av en merdetaljerad flygbildstolkning av vegetation och fysiska ingrepp, vilket vi också infört från 2015. Från 2015följer vi också fler gräsmarkstyper än vi gjorde 2009-2014.
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| 21. |
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| 22. |
- Josefsson, Jonas, et al.
(författare)
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Improving scientific rigour in conservation evaluations and a plea deal for transparency on potential biases
- 2020
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Ingår i: Conservation Letters. - : Wiley. - 1755-263X. ; 13:5
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Forskningsöversikt (refereegranskat)abstract
- The delivery of rigorous and unbiased evidence on the effects of interventions lay at the heart of the scientific method. Here we examine scientific papers evaluating agri-environment schemes, the principal instrument to mitigate farmland biodiversity declines worldwide. Despite previous warnings about rudimentary study designs in this field, we found that the majority of studies published between 2008 and 2017 still lack robust study designs to strictly evaluate intervention effects. Potential sources of bias that arise from the correlative nature are rarely mentioned, and results are still promoted by using a causal language. This lack of robust study designs likely results from poor integration of research and policy, while the erroneous use of causal language and an unwillingness to discuss bias may stem from publication pressures. We conclude that scientific reporting and discussion of study limitations in intervention research must improve and propose some practices toward this goal.
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| 23. |
- Kacergyte, Ineta, et al.
(författare)
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Community associations of birds with amphibians and fish in wetlands created for biodiversity
- 2023
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Ingår i: Biological Conservation. - 0006-3207 .- 1873-2917. ; 282
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Tidskriftsartikel (refereegranskat)abstract
- Conservation initiatives to support declining water-related biodiversity through wetland creation have increased during the last decades. Multiple studies have evaluated the suitability of created wetlands for birds and amphibians, but only a few have considered the species associations that might also affect the outcome. Using joint species distribution models, we explored species associations of birds, amphibians and fish in 52 created biodiversity wetlands in Sweden. As most of these wetlands were primarily created for increasing bird diversity, we asked whether the occurrence of fish and amphibians relates to bird species richness, pair abundance and chick abundance (as a measure of reproductive success) and whether conservation conflicts or synergies between birds, amphibians and fish can be observed. In general, we found positive bird-amphibian association patterns and negative bird-fish association patterns, although the uncertainties were high for these estimates. In line with previous research, the generally negative bird-fish co-variance indicates potential conservation conflicts between wetland creation for birds and fish, where fish might be introduced for recreational fishing or other ecosystem services. Therefore, our results suggest that it can be hard to benefit bird and fish communities with the same wetland, and separate wetland creation with different goals may be needed. The generally positive birdamphibian species-species associations and the lack of previous studies revealing conflicts indicate synergies between wetland creation for birds and amphibians. However, research needs to further consolidate such synergies, including amphibian reproductive output from bird-rich wetlands.
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| 24. |
- Kacergyte, Ineta, et al.
(författare)
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Environmental DNA metabarcoding elucidates patterns of fish colonisation and co-occurrences with amphibians in temperate wetlands created for biodiversity
- 2021
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Ingår i: Freshwater Biology. - : Wiley. - 0046-5070 .- 1365-2427. ; 66, s. 1915-1929
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Tidskriftsartikel (refereegranskat)abstract
- Wetlands are biodiversity hotspots that provide several essential ecosystem services. On a global scale, wetlands have greatly declined due to human activities. To counteract wetland loss, created wetlands are used as a conservation tool to facilitate biodiversity and provide habitats mainly for birds and amphibians. Fishes are likely to colonise the created wetlands and potentially affect the diversity and occurrence of amphibians. Still, species occurrence data for fish in created wetlands are largely lacking. Using eDNA metabarcoding, we investigated occurrence and co-occurrence patterns of fish and amphibian communities in 52 wetlands (some of which are ponds) created to benefit mainly bird and amphibian communities in south-central Sweden. Altogether, 17 fish and five amphibian species were detected in the created wetlands out of the 32 fish and six amphibian species found in the regional species pool. Amphibians were less common in wetlands physically connected to other wetlands. Connected wetlands were more fish-rich than isolated ones, suggesting potential fish avoidance. Additionally, the amphibian community occupied a narrower environmental niche compared to the fish community. Nevertheless, we observed only five statistically significant negative fish-amphibian species co-occurrences (out of 14 species considered). Even though our results suggest amphibian avoidance/exclusion from the created biodiversity wetlands, they also show that fish and amphibians frequently co-exist. Increased habitat heterogeneity in terms of water vegetation, size, shape, and structure of the wetland could be possible factors enabling the co-existence of these two taxa. With this study, we contribute to the general knowledge of fish occurrence patterns in created biodiversity wetlands. By comparing the frequencies of fish occurrence in natural and created wetlands, we have shown that there was some mismatch in what is common in natural compared to created wetlands. This mismatch probably comes from species-specific habitat requirements, stocking, and differences in detectability when using eDNA metabarcoding (small species detected) versus conventional multi-mesh gill-net methods (small species missed). Therefore, our results obtained using eDNA metabarcoding can complement the pre-existing knowledge of amphibian and fish associations and increase our understanding of how to create wetlands to facilitate biodiversity of several taxa.
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| 25. |
- Kacergyte, Ineta, et al.
(författare)
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Evaluating created wetlands for bird diversity and reproductive success
- 2021
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Ingår i: Biological Conservation. - : Elsevier BV. - 0006-3207 .- 1873-2917. ; 257
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Tidskriftsartikel (refereegranskat)abstract
- Wetland creation is a common conservation practice to mitigate biodiversity loss, caused by global wetland destruction. Despite this, there is a lack of large-scale evaluations of how created wetland characteristics and landscape context relate to bird diversity and reproductive success. We inventoried 89 created wetlands (0.2-20 ha) in central Sweden to investigate which local and landscape components were associated with breeding wetland bird species richness, pair abundance and reproductive success. Wetland size was positively associated with species richness, pair abundance and chick abundance. However, several small (1 ha) wetlands taken together were similar to or exceeded individual large wetlands of similar total wetland area, in terms of species richness, pair abundance, and chicks produced. While species richness showed a clear negative relationship with the proportion of the adjacent 50 m buffer composed of forest, pair abundance was positively related to the proportion of flooded grassland area and negatively related to the proportion of emergent water vegetation. Reproductive success measures showed no clear relationships to local habitat characteristics but tended to increase with a decreasing forest at the landscape scale. Our results suggest that breeding wetland bird populations could benefit from creating wetlands with a high flooded area, continuous management to minimise both the area of emergent water vegetation and the establishment of shrubs and trees in the immediate surroundings. We also suggest a practice of creating mainly small wetlands with a few larger ones to facilitate breeding wetland bird communities at the regional scale (gamma diversity).
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