Influence of silvicultural practices and population genetics on management of the spruce sawfly, Cephalcia arvensis

Battisti, Andrea; Boato, Alberta; Masutti, L.

doi:10.1016/s0378-1127(99)00144-9

Cited by 11 publications

(11 citation statements)

References 16 publications

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“…Quantifying patterns of genetic divergence between alternate cohorts has received little attention, particularly for sympatric cohorts. For example, genetic differences between cohorts that may be indicative of reproductive isolation have been uncovered in some studies (Battisti et al, 2000;Santos et al, 2007), whereas the presence of genetic divergence at one location but not another suggests that there can be spatial component to the efficacy of temporal isolation (Coates et al, 2004). Conversely, weak or nonsignificant genetic differentiation among cohorts has been interpreted as evidence for gene flow between alternate cohorts (that is, developmental plasticity; Schultheis et al, 2002Schultheis et al, , 2008, but equally may arise because of insufficient time for genetic divergence (Marcon et al, 1999) or inadequate genetic marker resolution (Kankare et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Developmental plasticity as a cohesive evolutionary process between sympatric alternate-year insect cohorts

Watts

Thompson

2011

Heredity

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Many species, particularly insects, pass through a series of distinct phases during their life history, with the developmental timing directed towards appropriate resources. Any factor that creates variation in developmental timing may partition a population into discrete populations-or 'cohorts'. Where there is continued failure to recruit outside the natal cohort then alternate cohorts will have their own internal dynamics, eventually leading to independent demographic and evolutionary trajectories. By contrast, continued variation in development rates within a cohort-cohort splitting-may homogenise otherwise independent demographic units. Using a panel of 14 microsatellite loci, we quantify the genetic signature of apparent demographic isolation between coexisting, but alternate, semivoltine cohorts of the damselfly Coenagrion mercuriale at locations that span its distribution in the UK. We find consistently low levels of genetic divergence between sympatric cohorts of C. mercuriale, indicative of developmental plasticity during the larval stage (unregulated development) whereby some individuals complete their development outside the predominant 2-year (semivoltine) period. Thus, individuals that alter their developmental rate successfully recruit to a different cohort. Despite maintaining contrasting population sizes, gene flow between alternate cohorts broadly is sufficient to place them on a similar evolutionary trajectory and also buffers against loss of genetic diversity. Such flexible larval development permits a response to local conditions and may facilitate response to environmental change.

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Section: Introductionmentioning

confidence: 99%

Developmental plasticity as a cohesive evolutionary process between sympatric alternate-year insect cohorts

Watts

Thompson

2011

Heredity

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“…This material is enriched with bacteria and micromycetes, particularly cellulose-decomposing species (Grunda 1999). Though frass pellets represent a minor fraction of natural litter, their number may substantially rise when a forest experiences sawfly outbreaks, which occasionally induce total defoliation and spruce die-back (Battisti et al 2000;Marchisio et al 1994). Similarly, bark beetle (Ips spp., Coleoptera) outbreaks or other environmental stress factors (including wind, snow, frost, drought, and acid precipitation) may cause mass defoliation and premature shedding of otherwise healthy green needles.…”

Section: Introductionmentioning

confidence: 99%

Decomposition of spruce litter needles of different quality by Setulipes androsaceus and Thysanophora penicillioides

et al. 2008

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Various biotic and abiotic factors may change the quality of cast spruce needles or induce premature casting, subsequently altering the composition of needle litter. We tested the decomposition efficiency of Setulipes androsaceus, a key litter decomposer in spruce forests, on needles of the Norway spruce (Picea abies) that fell into three different categories of quality. We designed a cultivation experiment to test the decomposition rate of the following needle categories: (1) naturally senesced brown needles, (2) intact, prematurely fallen green needles, and (3) frass pellets produced by caterpillars of the spruce web-spinning sawfly (Cephalcia spp.). Needles from each category were cultivated both independently and in combination. After a 4-month incubation, dry weight loss and the decrease of phydroxyacetophenone (p-HAP) and catechin were measured as markers of decomposition. Colonization of green needles by mycelia of S. androsaceus was initially inhibited. However, within the experimental period, those green needles successfully colonized by S. androsaceus lost more mass (22% of dry weight) than the brown needles (18% of dry weight). S. androsaceus also decreased the p-HAP and catechin contents of the green needles. Another fungal decomposer, Thysanophora penicillioides, was introduced only to the treatment that contained all three needle categories, and it induced less weight loss than S. androsaceus, but degraded the two phenolics to a similar extent. Neither the green nor the brown needles exhibited a more rapid rate of decomposition when cultivated in combination with another category of needles. We conclude that the increased proportions of green needles and frass pellets in the litter will be connected with temporarily increased decomposition activity of S. androsaceus.

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“…Also, thinning is a management tool, widely used to control insect outbreaks (Battisti et al, 2000)while some efforts are directed to reveal the hydrologic effects of defoliation due to insects or diseases (i.e., Swank et al, 1981;Cornish and Vertessy, 2001;Kloeppel et al, 2005). Gotmark et al (2005) emphasized the benefits of partial cutting on the biological diversity from a European perspective, and Twedt et al (1999) discussed it in relation with avian population, while Shao et al (2005) mentioned the new forestry policy in China requiring that forests be harvested with selective cutting methods.…”

Section: Introductionmentioning

confidence: 99%

Hydrological impacts of a slight thinning treatment in a deciduous forest ecosystem in Turkey

Serengil

Gökbulak

Özhan

et al. 2007

Journal of Hydrology

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Influence of silvicultural practices and population genetics on management of the spruce sawfly, Cephalcia arvensis

Cited by 11 publications

References 16 publications

Developmental plasticity as a cohesive evolutionary process between sympatric alternate-year insect cohorts

Developmental plasticity as a cohesive evolutionary process between sympatric alternate-year insect cohorts

Decomposition of spruce litter needles of different quality by Setulipes androsaceus and Thysanophora penicillioides

Hydrological impacts of a slight thinning treatment in a deciduous forest ecosystem in Turkey

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