Oecologia最新文献_第2页

Effects of elevated nutrient supply on litter decomposition are robust to impacts of mammalian herbivores across diverse grasslands. 在不同草原上，养分供给增加对凋落物分解的影响对哺乳动物和食草动物的影响是显著的。

IF 2.3 2区环境科学与生态学

Oecologia Pub Date : 2025-09-13 DOI: 10.1007/s00442-025-05791-4

Adrienne B Keller, Elizabeth T Borer, Christopher R Buyarski, Elsa E Cleland, Allison Gill, Andrew S MacDougall, Joslin L Moore, John W Morgan, Rebecca L McCulley, Anita C Risch, Eric W Seabloom, Justin Wright, Sarah E Hobbie

{"title":"Effects of elevated nutrient supply on litter decomposition are robust to impacts of mammalian herbivores across diverse grasslands.","authors":"Adrienne B Keller, Elizabeth T Borer, Christopher R Buyarski, Elsa E Cleland, Allison Gill, Andrew S MacDougall, Joslin L Moore, John W Morgan, Rebecca L McCulley, Anita C Risch, Eric W Seabloom, Justin Wright, Sarah E Hobbie","doi":"10.1007/s00442-025-05791-4","DOIUrl":"10.1007/s00442-025-05791-4","url":null,"abstract":"Litter decomposition is one of the largest carbon (C) fluxes in terrestrial ecosystems and links aboveground biomass to soil C pools. In grasslands, decomposition drivers have received substantial attention but the role of grassland herbivores in influencing decay rates is often ignored despite their potentially large effects on standing biomass and nutrient cycling. Recent work has demonstrated that nutrient addition increases early-stage decay and suppresses late-stage decay. Mammalian herbivores can mediate the effects of nutrient supply on biomass, suggesting herbivores may alter the effects of nutrients on decomposition, though this is largely unknown. We examined how herbivory mediates the effects of nutrient supply on long-term decomposition across 19 grassland sites of the Nutrient Network distributed experiment. At each site, a full-factorial experiment of combined nitrogen (N), phosphorus (P), and micronutrient (K) enrichment ('control' or ' + NPK') and mammalian herbivore (> ~ 50 g) exclusion ('unfenced' or 'fenced') was carried out in a randomized block design. We hypothesized that nutrient effects on litter decomposition would be strongest where herbivores caused the greatest reductions in aboveground plant biomass (i.e., at sites with more intense herbivory). After accounting for wide variation in decomposition rates across sites, we found that, within sites, elevated nutrients increased early-stage decay and suppressed late-stage decay. In contrast, neither herbivore exclusion (i.e., fencing) nor site level changes in aboveground biomass due to herbivory altered the nutrient effects on decomposition rates. Across grasslands, our results indicate that elevated nutrient supply modifies litter decomposition rates independent of herbivore impacts.","PeriodicalId":19473,"journal":{"name":"Oecologia","volume":"207 10","pages":"157"},"PeriodicalIF":2.3,"publicationDate":"2025-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12433350/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145058557","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

No drought memory in cotton despite evidence of drought acclimation. 棉花没有干旱记忆，尽管有干旱驯化的证据。

IF 2.3 2区环境科学与生态学

Oecologia Pub Date : 2025-09-12 DOI: 10.1007/s00442-025-05794-1

Ricky S Kong, Hugh A L Henry, Nicholas G Smith

{"title":"No drought memory in cotton despite evidence of drought acclimation.","authors":"Ricky S Kong, Hugh A L Henry, Nicholas G Smith","doi":"10.1007/s00442-025-05794-1","DOIUrl":"10.1007/s00442-025-05794-1","url":null,"abstract":"Plants are likely to experience multiple cycles of drought. However, physiological acclimation and stress memory may play key roles in reducing the detrimental effects of successive droughts. We investigated drought acclimation in cotton (Gossypium hirsutum) fertilized with low or high nitrogen (N) in a greenhouse factorial experiment. The cotton plants were subjected to one of four drought treatments applied during two 15-day periods, where plants were withheld water or were fully watered. We assessed CO2 assimilation (A400) and stomatal conductance (gs400), maximum rates of ribulose-1,5-bisphosphate (RuBP) carboxylase/oxygenase (RuBisCO) carboxylation (Vcmax), maximum rates of electron transport for RuBP regeneration (Jmax), and biomass at the time of harvest. Droughted and well-watered plants had similar rates of A400, gs400, Vcmax, and Jmax during the first drought under low N. High N plants were larger in size than low N plants, which suggests that the additional N likely increased the severity of the drought, causing stomatal closure and a decline in photosynthesis. However, there were increases in both Vcmax and Jmax for high N plants during the first drought. There was no evidence of drought memory, and plants exposed to both droughts responded similarly to plants exposed to only the second drought. Overall, our results indicate that cotton can acclimate under drought, and additional fertilization may result in severe drought stress.","PeriodicalId":19473,"journal":{"name":"Oecologia","volume":"207 10","pages":"156"},"PeriodicalIF":2.3,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145054872","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hydraulic constraints to stomatal conductance in flooded trees. 水淹树木气孔导度的水力约束。

IF 2.3 2区环境科学与生态学

Oecologia Pub Date : 2025-09-10 DOI: 10.1007/s00442-025-05789-y

Marisa J Brennan, Kristopher S Criscione, Jacob A Olichney, Junyan Ding, Yilin Fang, Nate McDowell, Brett T Wolfe

{"title":"Hydraulic constraints to stomatal conductance in flooded trees.","authors":"Marisa J Brennan, Kristopher S Criscione, Jacob A Olichney, Junyan Ding, Yilin Fang, Nate McDowell, Brett T Wolfe","doi":"10.1007/s00442-025-05789-y","DOIUrl":"10.1007/s00442-025-05789-y","url":null,"abstract":"Stomatal closure is a pervasive response among trees exposed to flooded soil. We tested whether this response is caused by reduced hydraulic conductance in the soil-to-leaf hydraulic continuum (ktotal), and particularly by reduced root hydraulic conductance (kroot), which has been widely hypothesized. We tracked stomatal conductance at the leaf level (gs) and canopy scale (Gs) along with physiological conditions in two temperate tree species, Magnolia grandiflora and Quercus virginiana, that were subjected to flood and control conditions in a greenhouse experiment. Flooding reduced gs, Gs, kroot and ktotal. Path analysis showed strong support for direct effects of ktotal on gs and for flood duration on ktotal, but not kroot on ktotal. A process-based model that accounted for the ktotal reduction predicted the timeseries of Gs in flood and control treatment trees reasonably well (predicted versus observed Gs R2 = 0.80 and 0.51 for M. grandiflora and Q. virginiana, respectively). However, accounting only for kroot reduction in flooded trees was insufficient for predicting observed Gs reduction. Together, these results suggest that hydraulic constraints were not limited to roots and highlight the need to account for flooding effects on ktotal when projecting forest ecosystem function using process-based models.","PeriodicalId":19473,"journal":{"name":"Oecologia","volume":"207 10","pages":"154"},"PeriodicalIF":2.3,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12423221/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145030348","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Crape myrtle bark scale Acanthococcus lagerstroemiae (Coccidae: Eriococcidae) infestation seasonally alters the insect biodiversity on crape myrtle trees. 紫薇树皮鳞片对紫薇树昆虫多样性的影响是季节性的。

IF 2.3 2区环境科学与生态学

Oecologia Pub Date : 2025-09-10 DOI: 10.1007/s00442-025-05792-3

Elijah P Carroll, David W Held, Nash E Turley, Selina Bruckner

{"title":"Crape myrtle bark scale Acanthococcus lagerstroemiae (Coccidae: Eriococcidae) infestation seasonally alters the insect biodiversity on crape myrtle trees.","authors":"Elijah P Carroll, David W Held, Nash E Turley, Selina Bruckner","doi":"10.1007/s00442-025-05792-3","DOIUrl":"10.1007/s00442-025-05792-3","url":null,"abstract":"Understanding changes to local communities brought about by biological invasions is important for conserving biodiversity and maintaining environmental stability. Scale insects (Hemiptera: Coccoidea) are a diverse group of insects well known for their invasion potential and ability to modify local abundance of multiple insect groups. Here, we tested how the presence of crape myrtle bark scale (Acanthococcus lagerstroemiae, CMBS), an invasive felt scale species, seasonally impacted local insect abundance, biodiversity, and community structure on crape myrtle trees. Our field surveys showed that CMBS-infested trees had seasonal changes to local insect abundance and family-level richness, and inverse Simpson's diversity relative to non-infested trees. CMBS infestation resulted in a decrease in community evenness on crape myrtle trees. Community compositions of insect visitors were distinct between infested and non-infested trees. CMBS-infested trees had greater seasonal abundances of Coccinellidae, Vespidae, Dolichopodidae, and Muscidae. Two of the families (Coccinellidae, Vespidae) that responded most strongly to CMBS infestation were dominated by non-native species. Our results show that CMBS-infested trees acted as resource hubs for natural enemies and carbohydrate scavengers, resulting in uneven communities shaped by a few highly responsive taxa. The temporal dynamics of these effects support CMBS as an ecological catalyst, reshaping urban insect communities and highlight its potential for facilitating invasion cascades in anthropogenic habitats. These results emphasize the importance of fine-scale temporal monitoring for understanding and mitigating the ecological impacts of introduced scale insects in urban environments.","PeriodicalId":19473,"journal":{"name":"Oecologia","volume":"207 10","pages":"155"},"PeriodicalIF":2.3,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12423138/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145033832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Beech leaf disease reduces nitrogen retranslocation at leaf fall, altering litter chemistry. 山毛榉叶病减少了落叶时氮的再转运，改变了凋落物的化学性质。

IF 2.3 2区环境科学与生态学

Oecologia Pub Date : 2025-09-09 DOI: 10.1007/s00442-025-05790-5

Aaron A MacDonald, Quincy S Dowling, Zoe G Cardon

{"title":"Beech leaf disease reduces nitrogen retranslocation at leaf fall, altering litter chemistry.","authors":"Aaron A MacDonald, Quincy S Dowling, Zoe G Cardon","doi":"10.1007/s00442-025-05790-5","DOIUrl":"https://doi.org/10.1007/s00442-025-05790-5","url":null,"abstract":"Beech leaf disease (BLD) poses a serious threat to the health of beech forests throughout the northeastern USA and Canada. Caused by invasive nematodes, BLD first appeared in 2012 in Ohio and has rapidly spread eastward. We investigated the effects of BLD on leaf and litter chemistry and leaf litter decomposition rate from four infected beech stands in Falmouth, Massachusetts. Attached leaves exhibiting differential infection intensity were collected from trees in October 2023 and analyzed for metrics of carbon (C) and nitrogen (N) content including %C, δ13C, %N, and δ15N. Severely infected and asymptomatic newly fallen leaf litter was gathered in November 2023 and analyzed for %C and %N only. We tested the effect of BLD-altered litter chemistry (separate from BLD-altered leaf structure) on litter decomposition rates by incubating ground litter in soil. Despite notably lower C:N in severely infected (C:N ~ 25) vs. asymptomatic (C:N ~ 43) litter, the difference in CO2 evolution was negligible in short-term incubations. Percent N was significantly higher in severely infected (cupped) vs. asymptomatic litter (P = 0.00076), but significantly lower in severely infected leaves compared to asymptomatic green leaves (P = 0.021). δ13C tended to increase with infection intensity, possibly reflecting increased water use efficiency with infection stress; δ15N showed no clear pattern. The severely symptomatic cupped leaves (gathered in October) and litter (gathered in November) had indistinguishable %N, suggesting trees retranslocated far less N out of infected leaves than out of asymptomatic leaves prior to leaf fall.","PeriodicalId":19473,"journal":{"name":"Oecologia","volume":"207 10","pages":"153"},"PeriodicalIF":2.3,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145023886","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Warming accelerates soil respiration and enhances the carbon sequestration in shrub and grass patches in Patagonian steppes. 变暖加速了巴塔哥尼亚草原灌木和草地的土壤呼吸和碳固存。

IF 2.3 2区环境科学与生态学

Oecologia Pub Date : 2025-09-05 DOI: 10.1007/s00442-025-05795-0

Sandra Janet Bucci, Luisina Carbonell-Silletta, Rocio Guillermina Haro, Gabriela Oliva, Nadia Soledad Arias, Guang-You Hao, Guillermo Goldstein, Fabian Gustavo Scholz

{"title":"Warming accelerates soil respiration and enhances the carbon sequestration in shrub and grass patches in Patagonian steppes.","authors":"Sandra Janet Bucci, Luisina Carbonell-Silletta, Rocio Guillermina Haro, Gabriela Oliva, Nadia Soledad Arias, Guang-You Hao, Guillermo Goldstein, Fabian Gustavo Scholz","doi":"10.1007/s00442-025-05795-0","DOIUrl":"10.1007/s00442-025-05795-0","url":null,"abstract":"Under the scenario of global warming, the response of carbon (C) fluxes of arid and semi-arid ecosystems, is still not well understood. A field warming experiment using open top chambers (OTCs) was conducted in a shrub-grass patagonian steppe to evaluate the effects on bare soil respiration (Rsoil), and ecosystem respiration (Reco), gross primary productivity (GPP) and net C exchange (NEE) during the growing season. Air (Tair) and soil (Tsoil) temperature, and soil available phosphorus changed significantly while there were no changes in soil moisture, soil organic carbon, total soil nitrogen and root biomass, after one-year of treatment. Inside OTCs Rsoil increased by 61%, with larger changes found during the daytime than during nighttime and tended to increase the temperature sensitivity (Q10) from 1.49 to 1.58. Enhanced daytime NEE was observed inside OTCs mainly in the shrub Senecio filaginoides patches where C sequestration increased by 37% and GPP by 35% without effects on Reco. In the grass Poa ligularis patches changes in C fluxes were not significant, but lower decrease in GPP than in Reco tended to increase C uptake inside OTCs. This study reveals that future climate scenarios will lead to an enhanced C sequestration of vegetated patches but also to a higher bare soil CO2 emission which may turn this ecosystem in a substantial C source if bare soil fraction increases due to global changes.","PeriodicalId":19473,"journal":{"name":"Oecologia","volume":"207 9","pages":"152"},"PeriodicalIF":2.3,"publicationDate":"2025-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145001030","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Biotic interactions and environmental filtering both determine earthworm alpha and beta diversity in tropical rainforests. 生物相互作用和环境过滤都决定了热带雨林中蚯蚓α和β的多样性。

IF 2.3 2区环境科学与生态学

Oecologia Pub Date : 2025-09-01 DOI: 10.1007/s00442-025-05788-z

Arnaud Goulpeau, Mickaël Hedde, Pierre Ganault, Emmanuel Lapied, Marie-Eugénie Maggia, Eric Marcon, Thibaud Decaëns

{"title":"Biotic interactions and environmental filtering both determine earthworm alpha and beta diversity in tropical rainforests.","authors":"Arnaud Goulpeau, Mickaël Hedde, Pierre Ganault, Emmanuel Lapied, Marie-Eugénie Maggia, Eric Marcon, Thibaud Decaëns","doi":"10.1007/s00442-025-05788-z","DOIUrl":"10.1007/s00442-025-05788-z","url":null,"abstract":"Understanding the relative importance of biotic interactions, multiple environmental drivers, and neutral processes in shaping community diversity and composition is a central question for both theoretical and applied ecology. We analysed a dataset describing 125 earthworm communities sampled in 10 localities in French Guiana. DNA barcodes were used to delimit operational taxonomic units (OTUs) that we considered as species surrogates to avoid the taxonomic deficit and calculate community-scale species richness and pair-wise Sørensen beta-diversity. We used log-ratio and generalised linear models to highlight the effects of biotic interactions and environment as drivers of alpha diversity, and generalised dissimilarity models to figure out the relative contribution of space and environment to beta-diversity at different spatial extents. Community-scale alpha diversity was mainly explained by habitat filtering (soil texture) and interspecific competition that limit the number of locally co-existing species. Beta diversity between pairs of communities was mainly explained by distance when comparing communities in similar habitats, by topography and available soil phosphorus when comparing communities in different habitats, and by distance, elevation and climate when comparing all possible pairs of communities. While community composition is determined locally by neutral processes and environmental filtering, biogeographic processes linked to dispersal limitation and adaptation to local environment are the most influential on a regional scale. This highlights the complex interplay of dispersal limitation, biotic interactions and environmental filtering during the process of community assembly.","PeriodicalId":19473,"journal":{"name":"Oecologia","volume":"207 9","pages":"151"},"PeriodicalIF":2.3,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144963393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Phenological mismatch between alpine flowers and bumble bees: its mechanism and impacts on the population dynamics of bumble bees. 高山花与大黄蜂物候失配的机制及其对大黄蜂种群动态的影响

IF 2.3 2区环境科学与生态学

Oecologia Pub Date : 2025-08-23 DOI: 10.1007/s00442-025-05775-4

Gaku Kudo, Tetsuo Imoto, Taietsu Nagase, Hai Xiang Liew

{"title":"Phenological mismatch between alpine flowers and bumble bees: its mechanism and impacts on the population dynamics of bumble bees.","authors":"Gaku Kudo, Tetsuo Imoto, Taietsu Nagase, Hai Xiang Liew","doi":"10.1007/s00442-025-05775-4","DOIUrl":"10.1007/s00442-025-05775-4","url":null,"abstract":"To determine the impacts of global warming on pollinator-plant interactions, we recorded phenological variations in alpine flowers and bumble bees during 10-12 years in northern Japan, and analyzed the effects of weather conditions and phenological shift on worker population dynamics of four Bombus species. Flowering patterns of alpine plants were formed by the combination of early-flowering fellfield and late-flowering snowbed communities, where snowbed flowers were important resources for worker bees. The flowering phenology of the fellfield communities was correlated with early season air temperature, whereas that of the snowbed communities was clearly predicted by snowmelt time. It was predicted that 1 °C warming with 10 days earlier snowmelt would advance the peak flowering time of the fellfield and snowbed communities by 3.6 and 9.5 days, respectively, resulting in a 9.2 day shorter flowering period. In contrast, the peak time of worker abundance was consistent between years, independent of temperature and snowmelt time. As a result, the time lag between the peak flowering of snowbed plants and the peak abundance of worker bees, i.e., the phenological mismatch, increased with earlier snowmelt. Mid-summer temperature was negatively correlated with worker abundance for three Bombus species, and the effect of phenological mismatch varied between Bombus species. The abundance of B. hypocrita decreased with increasing phenological mismatch in the previous year, the abundance of B. beaticola and B. yezoensis increased, and B. hypnorum showed no clear response. Therefore, changes in the phenology of alpine plants due to global warming affect pollinators in highly species-specific ways.","PeriodicalId":19473,"journal":{"name":"Oecologia","volume":"207 9","pages":"150"},"PeriodicalIF":2.3,"publicationDate":"2025-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12374912/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144963356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Widespread legacy effects on net primary productivity across western US drylands. 对美国西部旱地净初级生产力的广泛遗留影响。

IF 2.3 2区环境科学与生态学

Oecologia Pub Date : 2025-08-22 DOI: 10.1007/s00442-025-05785-2

Isabella R Goodman, Andrew J Felton

{"title":"Widespread legacy effects on net primary productivity across western US drylands.","authors":"Isabella R Goodman, Andrew J Felton","doi":"10.1007/s00442-025-05785-2","DOIUrl":"10.1007/s00442-025-05785-2","url":null,"abstract":"Despite the water-limited nature of dryland ecosystems, interannual variability in precipitation (PPT) fails to explain a significant fraction of interannual variability in net primary productivity (NPP). One hypothesis states that these weak temporal NPP-PPT associations arise from the lagged effects of previous-year conditions, denoted as \"legacy effects,\" which may amplify or constrain NPP in subsequent years. Although evidence suggests the existence of legacy effects in many ecosystem types, their generality in drylands remains unclear. We used long-term (35-year) remotely sensed estimates of NPP, climate, and a vegetation structure across the western United States to quantify the sign, magnitude, and drivers of legacy effects, defined as the lagged effects of previous-year weather and NPP anomalies on current-year NPP. Legacy effects exert a widespread effect on interannual variability in NPP across drylands spanning annual and perennial grasslands to hot and cold deserts. Previous-year NPP anomalies were the strongest predictor of current-year NPP anomalies, both across the entire time series and during specific extreme-to-average year transitions. The association between previous- and current-year NPP anomalies was consistently positive, indicating that a productive previous year will tend to result in a productive current year, and vice versa, even after accounting for the effect of current-year PPT. The strength of legacy effects increased slightly with increasing mean annual PPT and decreased slightly with an increase in the average fraction of herbaceous NPP. We conclude that legacy effects consistently effect current-year NPP in drylands and that consideration of these effects can improve predictions of temporal variation in dryland NPP.","PeriodicalId":19473,"journal":{"name":"Oecologia","volume":"207 9","pages":"149"},"PeriodicalIF":2.3,"publicationDate":"2025-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12373685/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144963529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Insect functional traits reveal processes that shape niche differentiation patterns. 昆虫的功能性状揭示了形成生态位分化模式的过程。

IF 2.3 2区环境科学与生态学

Oecologia Pub Date : 2025-08-21 DOI: 10.1007/s00442-025-05783-4

Robert Grosdidier, Raelene M Crandall, Emma Silverman, Philip G Hahn

{"title":"Insect functional traits reveal processes that shape niche differentiation patterns.","authors":"Robert Grosdidier, Raelene M Crandall, Emma Silverman, Philip G Hahn","doi":"10.1007/s00442-025-05783-4","DOIUrl":"10.1007/s00442-025-05783-4","url":null,"abstract":"Functional traits allow ecologists to infer processes that structure ecological communities and quantify interactions between trophic levels. Insects are a ubiquitous group that exhibits a variety of functional traits, and studying these traits could prove useful for understanding insect community assembly. We use insect trait measurements, community sampling along a disturbance gradient, and a cafeteria-style feeding assay to elucidate the mechanisms that govern insect herbivore community assembly processes. Using a trait principal component analysis, we first identified life history trade-offs between herbivore feeding and nutrition based on 3 traits measured on 14 grasshopper species collected across 30 pine savanna field sites. In the field, we tested hypotheses regarding how competition or environmental filtering might structure communities by examining dispersion patterns of functional traits. We found that grasshopper incisor strength and C:N ratio were consistently under-dispersed, patterns that indicate trait-clustering resulting from environmental filtering. Using mesocosms, we tested the hypothesis that grasshopper species should exhibit differentiation in their feeding niches based on the traits of the plants they consume and that feeding traits should correlate with traits of consumed plants. We demonstrated that grasshopper species strongly differentiated their feeding niche based on the traits of plants incorporated into their diets. We also found linkages between herbivore incisor strength and plant leaf dry matter content, and between grasshopper C:N ratio or body size and plant C:N ratio. This study revealed likely mechanisms that govern the interactions between insect herbivores, the plants they feed on, and how they partition resources to coexist.","PeriodicalId":19473,"journal":{"name":"Oecologia","volume":"207 9","pages":"147"},"PeriodicalIF":2.3,"publicationDate":"2025-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12370786/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144963378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0