Journal Article Differential Particle Uptake by Larvae of Three Mosquito Species (Diptera: Culicidae) Get access Christine Dahl, Christine Dahl 1Section of Entomology, Department of Zoology, Uppsala University, Box 561, S-751 22 Uppsala, Sweden Search for other works by this author on: Oxford Academic PubMed Google Scholar Göran Sahlén, Göran Sahlén 1Section of Entomology, Department of Zoology, Uppsala University, Box 561, S-751 22 Uppsala, Sweden Search for other works by this author on: Oxford Academic PubMed Google Scholar Jan Grawé, Jan Grawé 2Department of Pathology, Swedish University of Agricultural Sciences, Box 7028, S-750 07 Uppsala, Sweden Search for other works by this author on: Oxford Academic PubMed Google Scholar Anders Johannisson, Anders Johannisson 2Department of Pathology, Swedish University of Agricultural Sciences, Box 7028, S-750 07 Uppsala, Sweden Search for other works by this author on: Oxford Academic PubMed Google Scholar Herman Amneus Herman Amneus 2Department of Pathology, Swedish University of Agricultural Sciences, Box 7028, S-750 07 Uppsala, Sweden Search for other works by this author on: Oxford Academic PubMed Google Scholar Journal of Medical Entomology, Volume 30, Issue 3, 1 May 1993, Pages 537–543, https://doi.org/10.1093/jmedent/30.3.537 Published: 01 May 1993 Article history Received: 30 December 1991 Accepted: 09 November 1992 Published: 01 May 1993

Culex quinquefasciatus

Theobald

Particle (ecology)

10.1093/jmedent/30.3.537

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Dragonflies (Odonata) in Subtropical Atlantic Fores t fragments in Rio Grande do Sul, Brazil: seasonal di versity and composition Libélulas (Odonata) em subtropicais fragmentos de Mata Atlântica no Rio Grande do Sul, Brasil: diversidade sazonal e compos ição

Samuel Renner Eduardo Périco Göran Sahlén Halmstad Univer

Atlantic forest

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Morphology of follicle cells of Libellulidae (Odonata)

International Journal of Odonatology (2011)

Kamilla Koch Nadine Fuchs Göran Sahlén

In libellulids, mature oocyte size varies within and between individual ovaries.The regulating mechanism is not yet understood.Variations in the contents of the follicle cells, and thereby their ability to secrete material into the oocyte, might explain some of the observed differences in oocyte size.We therefore investigated the follicle cell surface, the interstitial space width between follicle cells and between follicle cells and oocytes, the number of nuclei, and the cell compartment proportions using scanning and transmission electron microscopy.In all investigated species, the follicle cells were covered by a basal lamina.We found cytoplasmic microvilli and septate junctions.As we could not find any pores or other structures on the cell surface, endocytosis seems to be the only mechanism transporting material into the follicle cells.Larger follicle cells had larger interstitial gaps between follicle cells and oocytes, larger nuclei and a larger mitochondrial area.Larger interstitial spaces between follicle cells and oocytes may afford more room that can be filled with material from the follicle cell layer.More mitochondria could provide more energy/ATP needed for the transport of the material.The quantity of free ribosomes and the mean number of nuclei seemed to be even more important to the productivity of the follicle cell.All these variations in cell contents cause productivity differences among follicle cells and may explain some of the size differences between oocytes within individual ovaries in libellulids.

Libellulidae

Morphology

10.1080/13887890.2011.617299

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Testing Dragonflies as Species Richness Indicators in a Fragmented Subtropical Atlantic Forest Environment

Neotropical Entomology (2015)

Samuel Renner Göran Sahlén Eduardo Périco

Biome

Indicator species

10.1007/s13744-015-0355-9

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Citations (21)

Dragonfly community re‐organisation in boreal forest lakes: rapid species turnover driven by climate change?

Insect Conservation and Diversity (2008)

Ida Flenner Göran Sahlén

Abstract. Climate change affects many ecosystems on earth. If not dying out or migrating, the species affected have to survive the altered conditions, including changes in community structure. It is, however, usually difficult to distinguish changes caused by a changing climate from other factors. Forestry is considered to be the major disturbance factor in Swedish forests. Here, we use forest lake data sets from 1996 and 2006 which include species abundance data for dragonfly larvae, water plant structure, forest age and forestry measures during a period of 25 years: from 1980 to 2005. Hence, we were able to discriminate between forestry effects and changes in species composition driven by recent climate change. We explored effects on regional species composition, species abundance and ecosystem functions, such as changes in niche use, utilising dragonflies (Odonata) as model organisms. Our results show that dragonflies react rapidly to climate change, showing strong responses over such a short time span as 10 years. We observed changes in both species composition and abundance; former rare species have become more frequent and now occur in lakes of a wider quality range, while former widespread species have become more selective in their choice of waters. The new communities harbour about the same number of species as before, but seen from a regional perspective, diversity is reduced. We predict that the altered species composition and abundance might raise new demands in conservation planning as well as altering the ecological functions of the aquatic systems.

10.1111/j.1752-4598.2008.00020.x

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Citations (91)

Rikare mångfald och mindre kväve Utvärdering av våtmarker skapade med stöd av lokala investeringsprogram och landsbygdsutvecklingsstöd

Jonas Svensson John A. Strand Göran Sahlén Stefan Weisner

Pa uppdrag av Naturvardsverket och Jordbruksverket har Vatmarkscentrum, Hogskolan i Halmstad, utvarderat svenska vatmarker anlagda med landsbygdsutvecklingsstod, LBU-stod (Miva, projektstod och Lmiva utan projektstod) respektive vatmarker anlagda inom lokala investeringsprogram (LIP) avseende naringsretention och biologisk mangfald. Resultaten fran utvarderingen redovisas separat for de fyra olika grupperna/kategorierna av anlagda vatmarker enligt nedan (fetstil anger kategorihanvisning i text, tabeller och figurer):• Vatmarker anlagda med anlaggningsstod inom Lokala investeringsprogram 1998 - 2002, LIP.• Vatmarker anlagda med anlaggningsstod inom LBU-projektstod (dessa vatmarker far vanligen aven skotselstod, Lmiva), 2000 - 2002.• Vatmarker anlagda 1996-1999, utan anlaggningsstod men med skotselstod (Miljostod), Miva.• Vatmarker anlagda fran ar 2000 - , utan anlaggningsstod men med skotselstod (LBU-vatmarker som endast far skotselersattning), Lmiva.Syftet har framst varit att utvardera och jamfora hur vatmarksanlaggning inom olika stodformer har bidragit till minskad overgodning och okad biologisk mangfald. Syftet har alltsa inte varit att utvardera enskilda vatmarker utan att ge en helhetsbild for olika stodformer och regioner. Darfor har det varit nodvandigt att basera utvarderingen pa data for ett stort antal vatmarker. Detta innebar att utforliga matningar ej kunnat genomforas inom de enskilda objekten. Narsaltsretention har darfor beraknats baserat pa modeller och biologisk mangfald har undersokts genom att trollslandor anvants som indikatorgrupp.Inom uppdraget har, med jordbruksstod, registrerats information om totalt 908 vatmarksobjekt om totalt 2860 ha ersatt yta fordelat pa 1815 ha Miva, 920 ha projektstod och 125 ha Lmiva utan projektstod. Totalt registrerade vatmarker med stod fran LIP ar 274 st, omfattande 439 ha.Kompletterande faltstudier har utforts i drygt 100 st vatmarker. Framst ar det resultaten fran dessa vatmarker som sammanfattas nedan...

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Dragonflies (Odonata) in Subtropical Atlantic Forest fragments in Rio Grande do Sul, Brazil : seasonal diversity and composition

Scientia Plena (2013)

Samuel Renner Eduardo Périco Göran Sahlén

One of the most endangered ecosystems in America is the Atlantic Forest, which demands emergency actions to protect its remnants as well its biodiversity. In this situation the species inventory can develop a management role for the future, determining specific areas that should be preserved as well the species composition and richness can be used as an indicator of a healthy ecosystem. The use of dragonfly species composition has proven its potential indication of quality habitats. The Odonata species actually still poorly known in the Neotropical region and has never been used as a tool to analyze the actual conditions of aquatic environments particularly in the Subtropical Atlantic Forest, which occurs in south of Brazil. A systematic survey was carried out in aquatic systems located at remnants of forest from March 2011 to February 2012. A total of 565 specimens belonging to 34 species, distributed in 5 families were sampled. Libellulidae was dominant, with 14 species, followed by Coenagrionidae, Gomphidae, Lestidae and Aeshnidae. Through inventory survey we deepen the Odonata composition knowledge and performed a statistic analysis.

Coenagrionidae

Libellulidae

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On the mechanism of biosynthesis of 19-hydroxyprostaglandins of human seminal fluid and expression of cyclooxygenase-2, PGH 19-hydroxylase (CYP4F8) and microsomal PGE synthase-1 in seminal vesicles and vas deferens

Prostaglandins & Other Lipid Mediators (2004)

Katarina Stark Johan Bylund Hans Törmä Göran Sahlén Ernst H. Oliw

Hydroxylation

Vas deferens

Prostaglandin H2

10.1016/j.prostaglandins.2004.09.014