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54. Reconstruction of brown bear population dynamics in Slovenia in the period 1998-2019 : ǂa ǂnew approach combining genetics and long-term mortality dataKlemen Jerina, Andrés Ordiz, 2021, original scientific article Abstract: Reliable data and methods for assessing changes in wildlife population size over time are necessary for management and conservation. For most species, assessing abundance is an expensive and labor-intensive task that is not affordable on a frequent basis. We present a novel approach to reconstructing brown bear population dynamics in Slovenia in the period 1998-2019, based on the combination of two CMR non-invasive genetic estimates (in 2007 and 2015) and long-term mortality records, to show how the latter can help the study of population dynamics in combination with point-in-time estimates. The spring (i.e. including newborn cubs) population size estimate was 383 (CI: 336-432) bears in 1998 and 971 (CI: 825-1161) bears in 2019. In this period, the average annual population growth rate was 4.5 %. The predicted population size differed by just 7 % from the non-invasive genetic size estimate after eight years, suggesting that the method is reliable. It can predict the evolution of the population size under different management scenarios and provide information on key parameters, e.g. background mortality and the sex- and age-structure of the population. Our approach can be used for several other wildlife species, but it requires reliable mortality data over time. Keywords: genetic estimates of population size, mortality records, population monitoring, population size, predictive modelling, brown bear Published in DiRROS: 28.03.2021; Views: 4255; Downloads: 2434 Full text (1005,41 KB) This document has many files! More... |
55. Spremljanje koncentracije askospor glive Eutypella parasiticaTine Hauptman, 2021, professional article Abstract: Gliva Eutypella parasitica izvira iz Severne Amerike in povzroča bolezen, imenovano javorov rak. V Sloveniji so jo prvič našli leta 2005, zdaj je razširjena po vsej državi, izkoreninjenje bolezni ni več mogoče. Da bi preprečili nadaljnje širjenje bolezni in zmanjšali število novih okužb, je treba okužena drevesa posekati. Pri tem velja navodilo, da okuženi del debla izrežemo vsaj 50 cm nad rano in pod njo, izrezani del pa nato na mestu sežgemo ali pa položimo na gozdna tla tako, da je rakava rana usmerjena proti tlom. Učinkovitost slednjega ukrepa smo želeli preverjati s spremljanjem koncentracij askospor glive E. parasitica v zraku, pred izvedenim ukrepom in po njem. Spremljanje ni bilo uspešno, tako da učinkovitosti ukrepa ne moremo potrditi. V prispevku predstavljamo metode spremljanja in razpravo o morebitnih razlogih za neuspešno lovljenje askospor glive E. parasitica. Keywords: javorov rak, Eutypella parasitica, monitoring, volumetrični vzorčevalnik, Slovenija Published in DiRROS: 08.03.2021; Views: 1474; Downloads: 417 Full text (392,15 KB) |
56. Predlog števila in lokacij kontrolnih-lovnih pasti in kontrolno-lovnih nastav v 2021Nikica Ogris, Marija Kolšek, Maarten De Groot, 2021, other scientific articles Keywords: kontrolno-lovna past, kontrolno-lovna nastava, optimizacija, protokoli, osmerozobi smrekov lubadar, Ips typographus, smreka, Picea abies, spremljanje, monitoring Published in DiRROS: 04.02.2021; Views: 1240; Downloads: 1000 Full text (1,84 MB) This document has many files! More... |
57. Priročnik za fenološka opazovanja dreves v mestu in urbanih gozdovihUrša Vilhar, 2014, dictionary, encyclopaedia, lexicon, manual, atlas, map Keywords: fenologija, urbani gozdovi, monitoring, drevnine, drevesa, priročniki Published in DiRROS: 01.02.2021; Views: 1472; Downloads: 497 Full text (1,17 MB) |
58. Estimating the most effective and economical pheromone for monitoring the European spruce bark beetleNina Šramel, Andreja Kavčič, Marija Kolšek, Maarten De Groot, 2021, original scientific article Abstract: In recent decades, there have been an increasing number of outbreaks of Ips typographus in Europe. A large amount of sanitary felling has taken place, with significant economic and ecological consequences. In order to anticipate such large%scale outbreaks, an effective monitoring system should be set up. One important aspect of monitoring is deciding which pheromone to use. Therefore, we decided to test five different commercially available pheromone lures under different disturbance conditions: Pheroprax%, IT Ecolure Extra%, Ipstyp%, Ipsowit% and Typosan%. We investigated the ability of the pheromones to distinguish between disturbed and undisturbed locations, their cost%efficiency ratio, and side effects such as bycatch abundance and composition. We set 50 traps in two areas with sites that were disturbed and undisturbed by windstorms. We collected the catch from traps every 1%2 weeks from the end of March until the end of September in 2019. We found that IT Ecolure Extra%, Ipsowit% and % Pheroprax% caught the most I. typographus and best showed changes in the trap catch of I. typographus throughout the whole season. There was a low amount of bycatch (<6% of the total catch) and a low number of predators (a few specimens), but some groups seem to prefer certain pheromones. The cost of the pheromones increased with their effectiveness. However, pheromone costs are low relative to the personnel costs involved in setting traps and collecting the catch. Based on all of the gathered data, we created an index which helps to assess the cost%efficiency of the five chosen commercially available pheromones. We also present guidelines on how to make such an index to assist other researchers in choosing the right pheromone for monitoring populations of I. typographus or other bark beetle species. Keywords: bark beetles, cost-efficiency, Ips typographus, monitoring pheromones, Picea abies Published in DiRROS: 21.01.2021; Views: 1484; Downloads: 846 Full text (1,21 MB) This document has many files! More... |
59. Idejna zasnova za namestitev piezometrov na pilotnem območju na Ljubljanskem barjuAndreja Ferreira, Boštjan Mali, 2020, project documentation (preliminary design, working design) Keywords: piezometri, hidrološki monitoring, Ljubljansko barje, mokrišče, podnebne spremembe, blaženje, raba zemljišč, sprememba rabe zemljišč, toplogredni plini Published in DiRROS: 14.01.2021; Views: 1345; Downloads: 427 Full text (2,21 MB) |
60. Predlogi postopkov za določitev optimalnega števila in lokacij kontrolnih pasti, kontrolnih nastav in lovnih nastav za osmerozobega smrekovega lubadarja (Ips typographus)Nikica Ogris, Marija Kolšek, Maarten De Groot, 2020, other scientific articles Keywords: kontrolna past, kontrolna nastava, lovna nastava, optimizacija, protokol, osmerozobi smrekov lubadar, Ips typographus, smreka, Picea abies, spremljanje, monitoring Published in DiRROS: 14.01.2021; Views: 1152; Downloads: 804 Full text (251,60 KB) This document has many files! More... |