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Franzén, Markus
Publikasjoner (10 av 28) Visa alla publikasjoner
Johansson, V., Kindvall, O., Askling, J. & Franzén, M. (2019). Intense grazing of calcareous grasslands has negative consequences for the threatened marsh fritillary butterfly. Biological Conservation, 239, 1-9, Article ID 108280.
Åpne denne publikasjonen i ny fane eller vindu >>Intense grazing of calcareous grasslands has negative consequences for the threatened marsh fritillary butterfly
2019 (engelsk)Inngår i: Biological Conservation, ISSN 0006-3207, E-ISSN 1873-2917, Vol. 239, s. 1-9, artikkel-id 108280Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Grazing generally benefits grassland biodiversity as it prevents shrub and tree succession. However, too intense grazing may have negative effects for example many grassland insects. EU-subsidies for grazing of some habitats, aimed at promoting biodiversity, still require a relatively intense grazing, and could therefore have negative consequences for some species. We quantified how such grazing affects habitat quality for the marsh fritillary butterfly, and how this influence its colonization-extinction dynamics and persistence. Specifically, we studied a metapopulation on Gotland (Sweden), where the marsh fritillary occupies unfertilized calcareous grassland with a naturally slow succession. We quantified the difference in larvae autumn nests between grazed and ungrazed habitat, and used this difference to adjust the 'effective area' of 256 habitat patches in a 50 km(2) landscape. We then parameterized a metapopulation model based on the occurrence pattern of the adult butterfly, and simulated future population development under different grazing regimes. The results showed that ungrazed habitat harbored 4.8 times more nests than grazed habitat. Reducing the 'effective area' of grazed patches accordingly increased the local extinction probability and decreased colonization. Grazing all suitable habitat reduced the occupancy by over 80%, while no grazing increased the occupancy by up to 40%, based on projections of future dynamics. Current grazing is clearly too intense, and EU-subsidies are here, thus, a conservation measure with negative consequences for a threatened butterfly. To prevent this, subsidies for grazing need to be more flexible and better adapted to the prevailing soil conditions and requirements of the target species.

sted, utgiver, år, opplag, sider
Elsevier, 2019
Emneord
Euphydryas aurinia, Incidence function model, Larvae autumn nests, Management, Metapopulation, Population persistence
HSV kategori
Forskningsprogram
Naturvetenskap, Ekologi
Identifikatorer
urn:nbn:se:lnu:diva-90547 (URN)10.1016/j.biocon.2019.108280 (DOI)000498750700001 ()
Tilgjengelig fra: 2019-12-13 Laget: 2019-12-13 Sist oppdatert: 2019-12-13bibliografisk kontrollert
Betzholtz, P.-E., Forsman, A. & Franzén, M. (2019). Inter-individual variation in colour patterns in noctuid moths characterizes long-distance dispersers and agricultural pests. Journal of applied entomology, 143(9), 992-999
Åpne denne publikasjonen i ny fane eller vindu >>Inter-individual variation in colour patterns in noctuid moths characterizes long-distance dispersers and agricultural pests
2019 (engelsk)Inngår i: Journal of applied entomology, ISSN 0931-2048, E-ISSN 1439-0418, Vol. 143, nr 9, s. 992-999Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

A high capacity for long‐distance dispersal is a key to success for species confronted with environmental heterogeneity, habitat modification, fragmentation and loss. However, dispersal capacity is difficult to quantify and therefore poorly known in most taxa. Here, we report on a test for an association of variation in dispersal capacity with variable colouration of noctuid moths. First, using data from 12 experienced lepidopterologists, we showed that despite variation among experts in average assessments, different species are consistently classified as having non‐variable, variable or highly variable colour patterns when assessed by different experts. We then compared the incidence of non‐resident species with high inter‐individual variation in colour patterns recorded on the isolated island Utklippan (n = 47), with that in a species pool of potential long‐distance dispersers from the nearest mainland (n = 295). Species with high inter‐individual colour pattern variation were over‐represented on the island compared with species having non‐variable colouration. This finding constitutes rare evidence from the wild of long‐distance dispersal, measured on a spatial scale relevant for moths when tracking habitats in fragmented and changing landscapes or when keeping pace with environmental challenges associated with climate change. Finally, we showed that Swedish noctuid moths classified as agricultural pests (n = 28) had more variable colour patterns compared with non‐pests (n = 368). The majority of agricultural pests were also recorded on the isolated island, an outcome that is indicative of pest species having high dispersal capacity. Data on colour pattern variation may thus offer a simple and cost‐effective proxy to estimate dispersal capacity and can also help identify potential pest species. Our findings are potentially useful when modelling and predicting population and range dynamics of species in spatiotemporally heterogeneous environments, with direct implications for conservation biology and pest management.

sted, utgiver, år, opplag, sider
John Wiley & Sons, 2019
HSV kategori
Forskningsprogram
Naturvetenskap, Ekologi
Identifikatorer
urn:nbn:se:lnu:diva-88584 (URN)10.1111/jen.12670 (DOI)000494886900010 ()
Tilgjengelig fra: 2019-08-23 Laget: 2019-08-23 Sist oppdatert: 2019-11-21bibliografisk kontrollert
Franzén, M., Dieker, P., Schrader, J. & Helm, A. (2019). Rapid plant colonization of the forelands of a vanishing glacier is strongly associated with species traits. Arctic, Antarctic and Alpine research, 51(1), 366-378
Åpne denne publikasjonen i ny fane eller vindu >>Rapid plant colonization of the forelands of a vanishing glacier is strongly associated with species traits
2019 (engelsk)Inngår i: Arctic, Antarctic and Alpine research, ISSN 1523-0430, E-ISSN 1938-4246, Vol. 51, nr 1, s. 366-378Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Recently developed glacier forelands provide valuable insights into vegetation dynamics. We studied the vascular plants in the glacier forelands of the Almajallojekna glacier in comparison to the plants in the surrounding area. The glacier is retreating rapidly at an average rate of 0.17 km(2) per year from 1898 to 2012. In the newly emerged glacier forelands, we found that 32 percent of the 381 plant taxa occurred in the surrounding region. Sixty-eight plant species were present on the youngest terrain (0-31 y), an additional thirteen species occurred on terrain aged 32-53 years, and an additional forty-two species were detected on terrain aged 54-114 years. Of the surrounding species pool, plant species that had successfully established in recently deglaciated terrains were characterized by high regional abundance and low seed weight, and they were more likely to be members of the plant families Saxifragaceae, Salicaceae, and Asteraceae. Woody plant species with a preference for well-drained soils were more likely to be present in the youngest terrain. Our results show that the vegetation of glacier forelands is developing rapidly depending on the plant species in the surrounding area and the species' life-history traits.

sted, utgiver, år, opplag, sider
Taylor & Francis Group, 2019
Emneord
Colonization rate, emerging ecosystems, environmental change, glacier retreat, life-history traits
HSV kategori
Forskningsprogram
Naturvetenskap, Ekologi
Identifikatorer
urn:nbn:se:lnu:diva-89420 (URN)10.1080/15230430.2019.1646574 (DOI)000486105800026 ()
Tilgjengelig fra: 2019-10-03 Laget: 2019-10-03 Sist oppdatert: 2019-10-03bibliografisk kontrollert
Carvalheiro, L. G., Biesmeijer, J. C., Franzén, M., Aguirre-Gutierrez, J., Garibaldi, L. A., Helm, A., . . . Kunin, W. E. (2019). Soil eutrophication shaped the composition of pollinator assemblages during the past century. Ecography
Åpne denne publikasjonen i ny fane eller vindu >>Soil eutrophication shaped the composition of pollinator assemblages during the past century
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2019 (engelsk)Inngår i: Ecography, ISSN 0906-7590, E-ISSN 1600-0587Artikkel i tidsskrift (Fagfellevurdert) Epub ahead of print
Abstract [en]

Atmospheric nitrogen deposition and other sources of environmental eutrophication have increased substantially over the past century worldwide, notwithstanding the recent declining trends in Europe. Despite the recognized susceptibility of plants to eutrophication, few studies evaluated how impacts propagate to consumers, such as pollinators. Here we aim to test if soil eutrophication contributes to the temporal dynamics of pollinators and their larval resources. We used a temporally and spatially explicit historical dataset with information on species occurrences to test if soil eutrophication, and more specifically nitrogen deposition, contributes to the patterns of change of plant and pollinator richness in the Netherlands over an 80 yr period. We focus on bees and butterflies, two groups for which we have good knowledge of larval resources that allowed us to define groups of species with different nitrogen related diet preferences. For each group we estimated richness changes between different 20-yr periods at local, regional and national scale, using analytical methods developed for analyzing richness changes based on collection data. Our findings suggest that the impacts of soil eutrophication on plant communities propagate to higher trophic levels, but with a time-lag. Pollinators with nitrogen-related diet preferences were particularly affected, in turn potentially impairing the performance of pollinator-dependent plants. Pollinator declines continued even after their focal plants started to recover. In addition, our results suggest that current levels of nitrogen deposition still have a negative impact on most groups here analyzed, constraining richness recoveries and accentuating declines. Our results indicate that the global increase in nitrogen availability plays an important role in the ongoing pollinator decline. Consequently, species tolerances to soil nitrogen levels should be considered across all trophic levels in management plans that aim to halt biodiversity loss and enhance ecosystems services worldwide.

sted, utgiver, år, opplag, sider
John Wiley & Sons, 2019
Emneord
extinction debt, herbivory, historical biodiversity changes, nitrogen deposition, nitrophily, pollinator communities
HSV kategori
Forskningsprogram
Naturvetenskap, Ekologi
Identifikatorer
urn:nbn:se:lnu:diva-90322 (URN)10.1111/ecog.04656 (DOI)000495405600001 ()
Tilgjengelig fra: 2019-11-29 Laget: 2019-11-29 Sist oppdatert: 2019-12-06
Franzén, M., Forsman, A. & Betzholtz, P.-E. (2019). Variable color patterns influence continental range size and species-area relationships on islands. Ecosphere, 10(1), Article ID e02577.
Åpne denne publikasjonen i ny fane eller vindu >>Variable color patterns influence continental range size and species-area relationships on islands
2019 (engelsk)Inngår i: Ecosphere, ISSN 2150-8925, E-ISSN 2150-8925, Vol. 10, nr 1, artikkel-id e02577Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

It has been hypothesized that species with more variable color patterns should have higher establishment success and be less sensitive to environmental changes and local extinction compared with species that do not vary in color. This difference in colonization/extinction balance should manifest as larger continental range distributions and modulate the species-area relationship on true islands. We evaluated these predictions using data for 1216 species of butterflies and moths that differed with regard to inter-individual variation in color pattern. We show that species with more variable color patterns have larger continental range sizes in Europe compared with non-variable species. We also provide rare evidence that the slope of the species-area relationship on islands is steeper for species having non-variable color patterns, suggesting that to preserve 60% of non-variable species would require an area twice as large compared to what would be needed to preserve 60% of variable species. Our findings suggest that combining information on ecological characteristics with presence/absence data from small and medium sized islands can help identify traits that drive species range patterns at the continental scale, and that individual variation in color pattern can be used as a proxy for ecological generalization and the ability to cope with environmental change.

sted, utgiver, år, opplag, sider
Wiley-Blackwell, 2019
Emneord
butterflies, colonization, color pattern variation, extinction, insects, island biogeography, life history, moths, polymorphism, range expansion, species-area relationship, trait
HSV kategori
Forskningsprogram
Naturvetenskap, Ekologi
Identifikatorer
urn:nbn:se:lnu:diva-80281 (URN)10.1002/ecs2.2577 (DOI)000456857400033 ()2-s2.0-85061078047 (Scopus ID)
Tilgjengelig fra: 2019-02-07 Laget: 2019-02-07 Sist oppdatert: 2019-08-29bibliografisk kontrollert
van Langevelde, F., Braamburg-Annegarn, M., Huigens, M. E., Groendijk, R., Poitevin, O., van Deijk, J. R., . . . WallisDeVries, M. F. (2018). Declines in moth populations stress the need for conserving dark nights. Global Change Biology, 24(3), 925-932
Åpne denne publikasjonen i ny fane eller vindu >>Declines in moth populations stress the need for conserving dark nights
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2018 (engelsk)Inngår i: Global Change Biology, ISSN 1354-1013, E-ISSN 1365-2486, Vol. 24, nr 3, s. 925-932Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Given the global continuous rise, artificial light at night is often considered a driving force behind moth population declines. Although negative effects on individuals have been shown, there is no evidence for effects on population sizes to date. Therefore, we compared population trends of Dutch macromoth fauna over the period 1985-2015 between moth species that differ in phototaxis and adult circadian rhythm. We found that moth species that show positive phototaxis or are nocturnally active have stronger negative population trends than species that are not attracted to light or are diurnal species. Our results indicate that artificial light at night is an important factor in explaining declines in moth populations in regions with high artificial night sky brightness. Our study supports efforts to reduce the impacts of artificial light at night by promoting lamps that do not attract insects and reduce overall levels of illumination in rural areas to reverse declines of moth populations.

sted, utgiver, år, opplag, sider
Wiley-Blackwell, 2018
Emneord
artificial light at night, ecological traits, ecology of the night, Lepidoptera, light pollution, phototaxis
HSV kategori
Forskningsprogram
Naturvetenskap, Ekologi
Identifikatorer
urn:nbn:se:lnu:diva-71442 (URN)10.1111/gcb.14008 (DOI)000425396700007 ()29215778 (PubMedID)2-s2.0-85042152419 (Scopus ID)
Tilgjengelig fra: 2018-03-09 Laget: 2018-03-09 Sist oppdatert: 2019-08-29bibliografisk kontrollert
Gerard, M., Vanderplanck, M., Franzén, M., Kuhlmann, M., Potts, S. G., Rasmont, P., . . . Michez, D. (2018). Patterns of size variation in bees at a continental scale: does Bergmann's rule apply?. Oikos, 127(8), 1095-1103
Åpne denne publikasjonen i ny fane eller vindu >>Patterns of size variation in bees at a continental scale: does Bergmann's rule apply?
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2018 (engelsk)Inngår i: Oikos, ISSN 0030-1299, E-ISSN 1600-0706, Vol. 127, nr 8, s. 1095-1103Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Body size latitudinal clines have been widley explained by the Bergmann's rule in homeothermic vertebrates. However, there is no general consensus in poikilotherms organisms in particular in insects that represent the large majority of wildlife. Among them, bees are a highly diverse pollinators group with high economic and ecological value. Nevertheless, no comprehensive studies of species assemblages at a phylogenetically larger scale have been carried out even if they could identify the traits and the ecological conditions that generate different patterns of latitudinal size variation. We aimed to test Bergmann's rule for wild bees by assessing relationships between body size and latitude at continental and community levels. We tested our hypotheses for bees showing different life history traits (i.e. sociality and nesting behaviour). We used 142 008 distribution records of 615 bee species at 50 x 50 km (CGRS) grids across the West Palearctic. We then applied generalized least squares fitted linear model (GLS) to assess the relationship between latitude and mean body size of bees, taking into account spatial autocorrelation. For all bee species grouped, mean body size increased with higher latitudes, and so followed Bergmann's rule. However, considering bee genera separately, four genera were consistent with Bergmann's rule, while three showed a converse trend, and three showed no significant cline. All life history traits used here (i.e. solitary, social and parasitic behaviour; ground and stem nesting behaviour) displayed a Bergmann's cline. In general there is a main trend for larger bees in colder habitats, which is likely to be related to their thermoregulatory abilities and partial endothermy, even if a 'season length effect' (i.e. shorter foraging season) is a potential driver of the converse Bergmann's cline particularly in bumblebees.

sted, utgiver, år, opplag, sider
Wiley-Blackwell, 2018
Emneord
Bergmann's rule, body size, latitudinal clines, life history traits, thermo-regulation, wild bees
HSV kategori
Forskningsprogram
Naturvetenskap, Ekologi
Identifikatorer
urn:nbn:se:lnu:diva-77380 (URN)10.1111/oik.05260 (DOI)000440305800003 ()2-s2.0-85050800800 (Scopus ID)
Tilgjengelig fra: 2018-08-30 Laget: 2018-08-30 Sist oppdatert: 2019-08-29bibliografisk kontrollert
Sattler, C., Schrader, J., Farkas, V. M., Settele, J. & Franzén, M. (2018). Pesticide diversity in rice growing areas of Northern Vietnam. Paddy and Water Environment, 16(2), 339-352
Åpne denne publikasjonen i ny fane eller vindu >>Pesticide diversity in rice growing areas of Northern Vietnam
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2018 (engelsk)Inngår i: Paddy and Water Environment, ISSN 1611-2490, E-ISSN 1611-2504, Vol. 16, nr 2, s. 339-352Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Pesticide use in developing countries increases rapidly. In many regions, we miss knowledge of how frequently pesticides are applied and which active ingredients are used. We present a new cost-efficient and rapid assessment method of recording pesticides diversity in rice-dominated landscapes and present some evidence of the misuse of active ingredients in our study regions. We investigated 17 rice fields in two regions of Northern Vietnam in 2014 and 2015. At each region, we explore the abundance of pesticides used with three methods including (1) the novel approach of collecting pesticide packages close to our target rice fields, (2) observations of farmers spraying pesticides in the surrounding and (3) interviewing local farmers. By collecting pesticide packages, we found 811 packages containing 74 different active ingredients. On average, 19 active ingredients (ranging from four to 40 active ingredients) were applied with an average content of 275.3 g of active ingredients per site. Insecticide packages (39%) were most abundant followed by those of fungicides (31%), herbicides (16%) and other active ingredients (14%). On all sites, active ingredients banned in the European Union were applied by the farmers. Collecting pesticide packages proved to be an efficient and rapidly implemented method to obtain some baseline information about pesticide application (for Northern Vietnam). We suspect that improved agricultural extension services could contribute to good agricultural practices in pest management. Generally, better information and education for local farmers for appropriate use of pesticides seem a necessity.

sted, utgiver, år, opplag, sider
Springer, 2018
Emneord
Agrochemicals, Agroecosystem insecticides, Active ingredients, Red River Delta, Rice fields
HSV kategori
Forskningsprogram
Naturvetenskap, Miljövetenskap
Identifikatorer
urn:nbn:se:lnu:diva-77411 (URN)10.1007/s10333-018-0637-z (DOI)000439341800009 ()2-s2.0-85042936925 (Scopus ID)
Tilgjengelig fra: 2018-08-29 Laget: 2018-08-29 Sist oppdatert: 2019-08-29bibliografisk kontrollert
Settele, J., Heong, K. L., Kuehn, I., Klotz, S., Spangenberg, J. H., Arida, G., . . . Wiemers, M. (2018). Rice ecosystem services in South-east Asia. Paddy and Water Environment, 16(2), 211-224
Åpne denne publikasjonen i ny fane eller vindu >>Rice ecosystem services in South-east Asia
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2018 (engelsk)Inngår i: Paddy and Water Environment, ISSN 1611-2490, E-ISSN 1611-2504, Vol. 16, nr 2, s. 211-224Artikkel i tidsskrift, Editorial material (Annet vitenskapelig) Published
sted, utgiver, år, opplag, sider
Springer, 2018
HSV kategori
Forskningsprogram
Naturvetenskap, Miljövetenskap
Identifikatorer
urn:nbn:se:lnu:diva-77409 (URN)10.1007/s10333-018-0656-9 (DOI)000439341800001 ()2-s2.0-85049557878 (Scopus ID)
Tilgjengelig fra: 2018-08-29 Laget: 2018-08-29 Sist oppdatert: 2019-08-29bibliografisk kontrollert
Schrader, J., Franzén, M., Sattler, C., Ferderer, P. & Wetsphal, C. (2018). Woody habitats promote pollinators and complexity of plant–pollinator interactions in homegardens located in rice terraces of the Philippine Cordilleras. Paddy and Water Environment, 16(2), 253-263
Åpne denne publikasjonen i ny fane eller vindu >>Woody habitats promote pollinators and complexity of plant–pollinator interactions in homegardens located in rice terraces of the Philippine Cordilleras
Vise andre…
2018 (engelsk)Inngår i: Paddy and Water Environment, ISSN 1611-2490, E-ISSN 1611-2504, Vol. 16, nr 2, s. 253-263Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Bees are important pollinators of wild plants and crops, but little is known about bee habitat requirements and pollinator management in tropical mountainous agricultural regions. Here, smallholder farmers produce fruits and vegetables in homegardens that depend upon or benefit from bee pollination. We hypothesized that abundance and richness of wild and domesticated bees and the complexity of plant–pollinator interactions are higher in homegardens surrounded by woody habitats than in homegardens found farther from woodlands. Bees were sampled in 20 homegardens in the rice terraces of the Philippine Cordilleras. We used linear mixed effect models to analyse effects of woody habitats around homegardens on bee richness and abundance. Based on pooled observations for each garden category, we built pollinator–plant interactions networks to illustrate shifts in interaction frequencies. We recorded 354 bee individuals of 13 wild and one domesticated bee species (Apis cerana). Wild bee richness was significantly higher in homegardens surrounded by woody habitats. Bee abundance increased significantly with increasing flower cover. Wild bees visited cultivated plants significantly more often than domesticated bees. Six vegetable species and 76% of all flower visits on cultivated plants in total were performed by wild bees and three plant species and 24% by domesticated bees. Pollinator–plant networks were more complex in homegardens surrounded by woody habitats. We conclude that woody habitats increase abundance and richness of wild and domesticated bees. Increasing availability of floral resources also promotes bee abundance. In order to promote pollination services in the landscape mosaic of smallholder rice farms, woody habitats and forest fragments together with numerous floral resources should be protected and restored.

sted, utgiver, år, opplag, sider
Springer, 2018
Emneord
Philippines, Wild bees, Domesticated bees, Woody habitats, Flower cover, Biodiversity hotspot
HSV kategori
Forskningsprogram
Naturvetenskap, Ekologi
Identifikatorer
urn:nbn:se:lnu:diva-67753 (URN)10.1007/s10333-017-0612-0 (DOI)000439341800004 ()2-s2.0-85026902263 (Scopus ID)
Merknad

Correction published in: Paddy and Water Environment, January 2018, Volume 16, Issue 1, pp 207–207

Tilgjengelig fra: 2017-09-06 Laget: 2017-09-06 Sist oppdatert: 2019-08-29bibliografisk kontrollert
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