Impacts of natural enemies and stand characteristics on cocoon mortality of the pine sawfly &lt;i&gt;Diprion pini&lt;/i&gt; in a Fennoscandian boreal forest

Blomqvist, Minna; Lyytikäinen‐Saarenmaa, Päivi; Kantola, Tuula; Kosunen, Maiju; Talvitie, Mervi; Holopainen, Markus

doi:10.14214/sf.1615

Cited by 6 publications

(4 citation statements)

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“…The absence of significant correlation between pine stands area and annual area of D. pini foci in different forests might be explained by different forest site conditions, age and relative density of stocking in particular stands, which determine the attractiveness of forest plots for this pest (Meshkova 2009;Blomqvist et al 2016;Kosunen et al 2017).…”

Section: Discussionmentioning

confidence: 99%

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Diprion pini L. (Hymenoptera, Symphyta, Diprionidae) population dynamics in the Low Dnieper region

Meshkova¹,

Назаренко

Kolienkina

2019

Folia Forestalia Polonica

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Pine sawflies (Hymenoptera, Symphyta, Diprionidae) are the most spread foliage browsing insects of pine forests in Europe, especially monovoltinous European pine sawfly Neodiprion sertifer (Geoffroy, 1785) and common pine sawfly Diprion pini (Linnaeus, 1758), which develops in one or two generations per year depending on weather. The outbreaks of both pine sawflies are the most frequent and intensive in the Steppe zone of Ukraine, especially in the Low Dnieper region, where pine forest (Pinus sylvestris Linnaeus and Pinus pallasiana D. Don) was planted on moving sands in the sixties of the 20th century. This research is aimed at the evaluation of the parameters for D. pini outbreak dynamics in the Low Dnieper region. Outbreak severity, specific foci area and mean score of stand threat by D. pini were evaluated from the regional statistical reports. In the regional scale for 1979–2017, notable outbreaks of D. pini were registered in 1982, 1993, 2002, 2006 and 2017. An interval between maximums was from 4 to 11 years, in average 9 years. The growth of foci area in 1979–1998 as compared to 1999–2017 as well as correlation between pine stand area and annual area of this pest’s foci in different forests was not statistically significant. Graphical analysis of dynamics of D. pini focal area for 2010–2017 was done based on individual threat levels. Our study confirms the fact of three outbreaks for this period in three forest and hunting enterprises (FHE), two outbreaks in one FHE and one outbreak in one FHE. An interval between the outbreaks makes three or six years. The causes of such shortening of interval are discussed.

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Section: Discussionmentioning

confidence: 99%

“…which damage Pinus sylvestris Linnaeus, Pinus pallasiana D. Don and some other pine species in the forests of Europe (Geri 1988;Barre et al 2002;Blomqvist et al 2016), particularly in Ukraine (Meshkova and Davydenko 2011;Meshkova and Kolienkina 2016).…”

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confidence: 99%

Diprion pini L. (Hymenoptera, Symphyta, Diprionidae) population dynamics in the Low Dnieper region

Meshkova¹,

Назаренко

Kolienkina

2019

Folia Forestalia Polonica

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“…For example, and also based on RF methods, Blomqvist et al (2016) found lichen and lingonberry coverages to be the best predictors for cocoon mortality of Dip in Finland. Coverage densities were negatively correlated with mean defoliation intensity.…”

Section: Discussionmentioning

confidence: 99%

Importance of Ecological Variables in Explaining Population Dynamics of Three Important Pine Pest Insects

Hentschel

Möller²,

Wenning³

et al. 2018

Front. Plant Sci.

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Climate change challenges forest vitality both directly by increasing drought and heat periods and indirectly, e.g., by creating favorable conditions for mass outbreaks of phyllophagous insects. The large forests dominated by Scots pine (Pinus sylvestris L.) that cover the lowland regions in northeast Germany have already been affected regularly by cyclic mass propagations of defoliating insect species in the past with climate projections implying an even more advantageous environment for devastating outbreaks in the future. To improve predictive and responsive capacities we have investigated a wide range of ecological parameters to identify those most strongly related to past outbreak waves of three central species. In total, we analyzed 3,748 variables covering stand and neighborhood properties, site quality, and climatic conditions for an area of roughly 750,000 ha of pine forests in the period 2002–2016. To reflect sensitivity against varying climate, we computed “floating windows” in relation to critical phenological phases of the respective insects. The parameters with the highest explanatory power resulted from the variable importance measures of the Random Forest (RF) methodology and have been evaluated by a 10-fold cross-validation process. Our findings closely reflect the known specific gradation patterns and show that relative variable importance varies with species. While Lymantria monacha L. feeding was mainly dependent on the surroundings of the respective stand, Diprion pini L. proved to be almost exclusively susceptible to climatic effects in its population dynamics. Dendrolimus pini L. exhibited a mixed pattern of variable importance involving both climatic and forest structure parameters. In many cases the obtained statistical results support well-known ecological cause-effect relations and long-term population change dynamics. The RF delivered very high levels of sensitivity and specificity in the developed classifications and proved to be an excellent tool to handle the large amounts of data utilized for this study. While the presented classification approach may already support a better prognosis of the amplitude during the outbreak culmination, the obtained (most important) variables are proposed as preferable covariates for modeling population dynamics of the investigated insect species.

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“…soil conditioned by the dominant marsh species, smooth cordgrass) on mangrove freeze tolerance and fitness (Chen et al., 2020). In addition, natural enemies affect distributions at local to intercontinental scales (Blomqvist et al., 2016; Holt & Barfield, 2009; Keane & Crawley, 2002), and below‐ground enemy release has been widely documented in invasive plant species (Mitchell et al., 2006; Reinhart & Callaway, 2006). Positive species interactions can also be important; species moving outside their native range may lose benefits from mutualists that do not co‐migrate, yet they can also gain novel mutualistic interactions (Callaway et al., 2011; Richardson et al., 2000).…”

Section: Lessons To Be Learned From Applying a Plant–soil Feedback Pementioning

confidence: 99%

Incorporating marine macrophytes in plant–soil feedbacks: Emerging evidence and opportunities to advance the field

et al. 2020

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Plants can change the biotic and abiotic characteristics of soil, which can in turn affect the growth of plants. For example, changes in below‐ground microbial composition by one plant can affect the relative performance of a second plant, in turn affecting the outcome of plant–plant interactions, invasive species success, species abundance distributions, successional processes and plant community composition and diversity. The effects of plant–soil feedbacks on population, community and ecosystem processes in coastal and marine soft‐sediment systems have received relatively little attention, yet several recent examples offer compelling evidence for their importance. Marine soft‐sediment systems offer an ideal opportunity to test key theoretical predictions for when plant–soil feedbacks may contribute to species coexistence and influence community composition, including the role of phylogenetic distance and relatedness, the potential for intraspecific feedbacks, the importance of environmental context, the influence of climate change and the implications for ecosystem function. Synthesis. There is a documented disconnect between marine and terrestrial research that slows the advancement of generalisable theory. We suggest that bridging this gap in our understanding of plant–soil feedbacks may provide a unifying framework underlying plant community structure in both terrestrial and marine ecosystems.

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Impacts of natural enemies and stand characteristics on cocoon mortality of the pine sawfly <i>Diprion pini</i> in a Fennoscandian boreal forest

Abstract: M. (2016). Impacts of natural enemies and stand characteristics on cocoon mortality of the pine sawfly Diprion pini in a Fennoscandian boreal forest.

Cited by 6 publications

References 43 publications

Diprion pini L. (Hymenoptera, Symphyta, Diprionidae) population dynamics in the Low Dnieper region

Diprion pini L. (Hymenoptera, Symphyta, Diprionidae) population dynamics in the Low Dnieper region

Importance of Ecological Variables in Explaining Population Dynamics of Three Important Pine Pest Insects

Incorporating marine macrophytes in plant–soil feedbacks: Emerging evidence and opportunities to advance the field

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