Essays about: "Dragonflies"

Showing result 1 - 5 of 7 essays containing the word Dragonflies.

  1. 1. Simulating Facilitation in a Spiking Neural Network

    University essay from Lunds universitet/Examensarbeten i molekylärbiologi

    Author : Alexander Kuzmin; [2020]
    Keywords : Biology and Life Sciences;

    Abstract : Many insects are able to detect, isolate and track small targets that move quickly against a dynamic background. This ability is enabled by a group of neurons called small target motion detectors (STMD). These neurons, among other properties, have a type of short term memory called response facilitation. READ MORE

  2. 2. Study on biomass in semiaquatic insects (Odonata) over a 20-year period in central, Sweden.

    University essay from Högskolan i Halmstad/Akademin för ekonomi, teknik och naturvetenskap

    Author : Andreas Zsoldos; [2018]
    Keywords : Biomass; Odonata; Aesnidae; Libelluidae;

    Abstract : This study is about how biomass of dragonflies insects have changed over the past 20-years in a forested area of central Sweden. This was done by analysing previously collected Odonata larvae stored in ethanol where sampling effort corrects the weight per locality. READ MORE

  3. 3. The environmental and anthropogenic impact onfreshwater biodiversity in Lajeado, RS, Brazil. : A study of using dragonflies as indicators for theenvironmental status in freshwater biomes

    University essay from

    Author : Philip Sjöwall; Robert Lundström; [2016]
    Keywords : Dragonlfies; freshwater; Braszil;

    Abstract : Fragmentation of the Atlantic rainforest and alteration of waters due to agricultural expansion hasgreatly affected the species diversity in Brazil. In this study, we investigate how different environmental factors affect dragonfly communities and dragonfly species richness in sixteen different locations in Rio Grande do Sul, Brazil. READ MORE

  4. 4. The antihistamine hydroxyzine and Odonata : Bioaccumulation and effects on predator-prey interactions between dragonfly and damselfly larvae

    University essay from Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

    Author : Ellinor Bomark; [2014]
    Keywords : Aquatic insects Odonata predator-prey bioconcentration antihistamines;

    Abstract : Through wastewater entering aquatic environments, aquatic insects are continuously exposed to pharmaceuticals including neurologically active antihistamines. The antihistamine hydroxyzine has previously been found to lower activity in damselflies and to reach 2000 times the concentration of surrounding water in damselfly tissue. READ MORE

  5. 5. Forest lakes affected by forestry - how resilient are dragonfly communities to logging in Central Sweden?

    University essay from Högskolan i Halmstad/Sektionen för ekonomi och teknik (SET)

    Author : Ida Flenner; [2007]
    Keywords : dragonflies; ecological resilience; forestry; disturbance; species composition;

    Abstract : The main cause of environmental disturbance in the Fennoscandian boreal forests today is forestry. Natural disturbances are important to maintain diversity, but anthropogenic disturbance, such as forestry, differs in many ways from the natural ones. Forestry is a big industry in Sweden and only a small remnant of old-growth forest is left. READ MORE