Indicator species reveal the physical and biological singularity of esker ecosystems

Ecological Indicators, Journal Year: 2023, Volume and Issue: 154, P. 110612 - 110612

Published: July 21, 2023

Eskers are complex geological formations shaped with a linear accumulation of sand and gravel under the glaciers during last ice age that provide crucial resources such as drinking water, sand/gravel, outdoor recreational sites, productive forests. Surrounding connection groundwater influences physicochemical properties lakes on esker which can benefit different biotic communities in food web. The sustainable management provided by eskers requires baseline ecological knowledge these ecosystems. However, very little information exists about ecology freshwater ecosystems eskers. This study uses web approach to identify environmental variables, biological diversity, indicator species associated better understand their functioning biodiversity patterns conservation. Fifty were sampled Abitibi-Témiscamingue region (Canada), half surrounding boreal clay belt include most abundant lake region. Physicochemical, environmental, anthropogenic variables measured two types showed differed markedly from lakes. Nutrient concentrations, conductivity, macrophyte cover significantly lower than lakes, whereas dissolved oxygen saturation concentration opposite trend. Three interconnected trophic levels webs—waterbird, fish, macroinvertebrate communities—were characterized for diversity species. We found Shannon index waterbirds (mean ± standard deviation; 0.7 0.2), fish (0.4 0.3), tendency value macroinvertebrates (0.9 0.3) (1.1 0.4, 0.9 0.3, 1.3 0.5, respectively). Common goldeneye (Bucephala clangula) Canada goose identified In contrast, ring-necked duck (Aythya collaris) hooded merganser (Lophodytes cucullatus) Perlidae was similarly an macroinvertebrates. Anthropogenic activities forest harvesting have altered waterbird community, around modified communities. conclude differ other regional specific is all studied web, but waterbodies preferential habitats some research provides first necessary establish conservation strategies this vulnerable ecosystem.

Language: Английский

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Forest Landscape Model Initialization with Remotely Sensed-Based Open-Source Databases in the Absence of Inventory Data

Forests, Journal Year: 2023, Volume and Issue: 14(10), P. 1995 - 1995

Published: Oct. 4, 2023

Forecasts of the forest ecosystem dynamics are important for environmental protection and resource management. Such forecasts can support decisions about where how to restore damaged forests plan felling, in conservation. Forest landscape models (FLM) used predict changes at level. FLM initialization usually requires detailed tree species age data; so, absence inventory data, it is extremely difficult collect initial data FLM. In our study, we propose a method combining from open sources, including remote sensing solve problem lack describe initializing LANDIS-II model. We collected land cover classification above-ground biomass products, climate, soil, elevation create vegetation ecoregion maps. Our based on some simplifications study object—some replaced by groups species; stand considered homogeneous. After initialization, natural without harvesting disturbances were simulated Biomass Succession extension 200 years. The presents methodology that be initialize other areas FLMs with field data.

Language: Английский

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Evaluating the impact of climate change on the black spruce defoliation by spruce budworm

Published: March 24, 2023

Current ecological models predict profound climate change-related effects on the natural disturbance regimes of forests. Spruce budworm (Choristoneura fumiferana) (SBW) is principal insect defoliator in eastern North America, and SBW outbreaks have a major impact structure function Canadian boreal forest, as defoliation leads to decreased tree growth, increased mortality, lower forest productivity. become more severe over last century with changing climate; however, little known about how integrated effect alters growth host species. Here we evaluate outbreak severity combined affect black spruce (Picea mariana) during that occurred between 1968-1988 2006-2017. We compiled dendrochronological series (2271 trees), (estimated by observed aerial defoliation), data for 164 sites Québec, Canada. used linear mixed model determine impacts climatic parameters, cumulative (of previous five years), their interaction basal area growth. At maximum severity, was reduced 14%–18% years due effect. This response affected climate: warmer summer minimum temperatures higher moisture index (CMI) further 11% 4%, respectively. In contrast, negative attenuated 9% temperature spring 7% summer. study improves our understanding insect–climate helps predictions future SBW-related damage stands bolster sustainable management. also recommend projections ecosystems include several classes coupled multiple scenarios.

Language: Английский

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A 6-year study on the mortality dynamics of sprouts germinated on Schima superba after a severe ice storm in southern China

Frontiers in Plant Science, Journal Year: 2023, Volume and Issue: 14

Published: May 12, 2023

Introduction Natural disturbances modify forest structure by affecting regeneration dynamics and can change main ecosystem functions. An ice storm unusually took place in southern China early 2008, which caused huge damage to forests. Resprouting of woody plants a subtropical has received little attention. The role survival time mortality been assessed for newsprouts after an storm. Methods In this study, types, addition the annual number rates sprouts all tagged sampled resprouted Chinese gugertree ( Schima superba Gardner & Champ.) individuals more than or equal 4 cm basal diameter (BD), were monitored. A total six plots (20 m × 20 m) wererecorded secondary dominated S. Jianglang Mountain, China. This investigation had conducted consecutive years. Results results showed that dependent on year they sprouted. earlier boomed, lower mortality. produced 2008 highest vitality rates. Sprouts decapitated trees exhibited better rate those uprooted leaning trees. Sprouting position also plays regeneration. at trunks upper trunksof lowest relationship between accumulative average new isaffected types. Discussion We reported sproutsin rare natural disaster. information could serve asa reference construction branch sprout dynamic model ormanagement restoration storms.

Language: Английский

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Indicator of climate variability: low treeline displacement in arid valleys of mountain areas, China

Journal of Mountain Science, Journal Year: 2023, Volume and Issue: 20(11), P. 3250 - 3265

Published: Nov. 1, 2023

Language: Английский

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Patch level boreal bryophyte diversity driven by landscape heterogeneity

Forest Ecology and Management, Journal Year: 2024, Volume and Issue: 563, P. 121978 - 121978

Published: May 17, 2024

Language: Английский

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Comparing assumptions and applications of dynamic vegetation models used in the Arctic-Boreal Zone of Alaska and Canada.

Environmental Research Letters, Journal Year: 2024, Volume and Issue: 19(9), P. 093003 - 093003

Published: July 22, 2024

Abstract Modeling Arctic-Boreal vegetation is a challenging but important task, since this highly dynamic ecosystem undergoing rapid and substantial environmental change. In work, we synthesized information on 18 models (DVMs) that can be used to project structure, composition, function in North American ecosystems. We reviewed the properties scaling assumptions these make, their applications from scholarly literature, conducted survey of expert opinion determine which processes are lacking DVMs. then grouped into four categories (specific intention models, forest species cohort carbon tracking models) using cluster analysis highlight similarities among models. Our application review identified 48 papers addressed dynamics either directly (22) or indirectly (26). The results indicated large desire for increased representation active layer depth permafrost future model development. Ultimately, paper serves as summary DVM development environments guide potential users, thereby prioritizing options

Language: Английский

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Simulation of Fire Occurrence Based on Historical Data in Future Climate Scenarios and Its Practical Verification

Fire, Journal Year: 2024, Volume and Issue: 7(10), P. 346 - 346

Published: Sept. 28, 2024

Forest fire is one of the dominant disturbances in forests Heilongjiang Province, China, and most rapid response predictors that indicate impact climate change on forests. This study calculated Canadian FWI (Fire Weather Index) its components from meteorological record over past years, a linear model was built monthly mean numbers. The significance test showed numbers had very pronounced correlation, suitable for predicting this region. Then were SRES (IPCC Special Report Emission Scenarios) A2 B2 climatic scenarios, rebuilt to be scenarios. results indicated would increase by 2.98–129.97% −2.86–103.30% scenarios during 2020–2090, respectively. variation tendency similar increasing risk uneven across months these two analysis FFMC (Fine Fuel Moisture Code) dramatically summer, decreasing precipitation summer contribute greatly tendency. rapidly spring season autumn season, have speed season. DMC (Duff DC (Drought relatively balanced rates autumn. region space as well. In early 21st century, north Province more than south, whereas middle south gradually catch up with century. changes seasons influence management policy region, variations scross suggest development sources forest fuel should conducted.

Language: Английский

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Effect of silvicultural treatment of individual selection on the horizontal structure of a pine-oak forest in northern Mexico

Notulae Botanicae Horti Agrobotanici Cluj-Napoca, Journal Year: 2023, Volume and Issue: 51(2), P. 13082 - 13082

Published: June 6, 2023

In sustainable forest management it is essential to conserve and maintain biodiversity, the floristic composition mixture of its species. For this purpose, objective study was evaluate effect selection silvicultural treatment as a function time, on horizontal structure Pine-Oak Forest in northern Mexico. Nine sampling points were established analyze Initial Condition 2012, Recruitment 2022 Final 2022. addition, Jaccard similarity coefficient Margalef wealth index estimated. Likewise, Shannon true diversity index, importance value calculated for each The analysis variance with confidence 95% used studied variables, multiple comparisons made Duncan's test group species ranges statistical importance. results indicated that not presented change similarity, richness due application treatment, without differences according mix distribution forest, indicates selective logging does Regarding indices diversity, by species, no significant observed terms treatment. According these results, possible identify groups value, where Pinus durangensis Martínez most representative

Language: Английский

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Interactions between Climate, Soil and Competition Drive Tree Growth in Quebec Forests

Published: Jan. 1, 2023

Climate, soil, and competition factors jointly drive tree growth variability at local regional scale. However, the comprehensive interaction of these their combined effects on responses within environment remains poorly explored in current research. Using a detailed forest inventory dataset Québec, we examined red maple (Acer rubrum L.), sugar saccharum Marshall), yellow birch (Betula alleghaniensis Britton), white papyrifera balsam fir (Abies balsamea Mill), black spruce (Picea mariana as function for light space with neighboring trees, climate soil-related variables. Interactions between all variables were considered Bayesian model predicting growth. The amount received by trees was main explaining except coniferous species which influenced mostly Among studied species, only exhibited increased under warmer conditions. Intraspecific had strong species-specific impacts, varying from negative fir, to positive birch. climate, played crucial role shaping patterns, especially maple, that strongly responded combination factors. In general, also soil cation-exchange capacity (CEC), when higher CEC is coupled temperatures precipitation, spruce. While anticipated conditions Quebec, even most optimistic scenarios, will have impact management can mitigate this promoting diversity more complex stand structures.

Language: Английский

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