10 Works

Thermal stratification and fish thermal preference explain vertical eDNA distributions in lakes

Joanne Littlefair, Lee Hrenchuk, Paul Blanchfield, Michael Rennie & Melania Cristescu
Significant advances have been made towards surveying animal and plant communities using DNA isolated from environmental samples. Despite rapid progress, we lack a comprehensive understanding of the “ecology” of environmental DNA (eDNA), particularly its temporal and spatial distribution and how this is shaped by abiotic and biotic processes. Here, we tested how seasonal variation in thermal stratification and animal habitat preferences influence the distribution of eDNA in lakes. We sampled eDNA depth profiles of five...

Data from: Global pattern and drivers of nitrogen saturation threshold of grassland productivity

Yunfeng Peng, Han Chen, Yuanhe Yang & Han Y.H. Chen
Ecosystem productivity usually exhibits first increase and then saturated response to increasing nitrogen (N) additions, yet the broad-scale pattern and potential drivers of the N saturation threshold are little investigated. By synthesizing N addition experiments with at least four N-input levels from the global grasslands, we applied the quadratic-plus-plateau model to fit the aboveground net primary productivity (ANPP)-N rate relationship, and estimated the saturation threshold for N rate (critical N rate, NCR) and maximum ANPP...

Database from forest inventory of the different states and provinces of western North America

Yassine Messaoud
The climate variables effect on tree growth in boreal and temperate forests has received increased interest in the global context of climate change. However, most studies are often limited to local or regional scales and involved a few tree species. Here, sixteen tree species across western North America were used to investigate tree response to climate change at the species range scale. Forest inventory databases from 36,944 stands established between1600 and 1968 throughout western Canada...

Interactive effects of global change factors on terrestrial net primary productivity are treatment length- and intensity-dependent

Zilong Ma, Scott Chang, Han Chen & Yongchun Li
1. Individual effects of co‐occurring global change factors on net primary productivity (NPP) have been widely studied; however, their interactive effects remain highly debated. 2. Here, we conducted a global meta‐analysis based on 919 multifactor observations from 120 published studies to examine the interactive effects on NPP of global change factors including elevated [CO2], warming, nitrogen addition, irrigation, drought, and changes in species diversity. 3. On average, of the factors studied, six pairs of factors...

Isotopic evidence for long-distance connections of the AD thirteenth century Promontory caves occupants

Jessica Metcalfe, John Ives, Sabrina Shirazi, Kevin Gilmore, Jennifer Hallson, Fiona Brock, Bonnie Clark & Beth Shapiro
The Promontory caves (Utah) and Franktown Cave (Colorado) contain high-fidelity records of short-term occupations by groups with material culture connections to the Subarctic/Northern Plains. This research uses Promontory and Franktown bison dung, hair, hide, and bone collagen to establish local baseline carbon isotopic variability and identify leather from a distant source. The ankle wrap of one Promontory Cave 1 moccasin had a δ13C value that indicates a substantial C4 component to the animal’s diet, unlike...

Forest soil acidification consistently reduces litter decomposition irrespective of nutrient availability and litter type

Ying Shen, Tian Dashuan, Hou Jihua, Wang Jinsong, Zhang Ruiyang, Li Zhaolei, Chen Xinli, Wei Xuefeng, Zhang Xinyu, He Yicheng & Niu Shuli
Nitrogen (N), phosphorus (P), and acid deposition are co-occurring in many ecosystems, likely with complex interactive effects on litter decomposition. Few studies have been conducted to distinguish the interactive effects of these three factors on forest litter decomposition. Thus, we performed a 5-year litter decomposition experiment with N, P, acid addition in a temperate forest of Changbai Mountain in China, including four litter types from Pinus koraiensis, Quercus mongolica, Tilia amurensis and their mixtures. Our...

Clients’ and Coaches’ Perspectives of a Life Coaching Intervention for Parents with Overweight/Obesity

Shazya Karmali, Danielle S. Battram, Shauna M. Burke, Anita Cramp, Tara Mantler, Don Morrow, Victor Ng, Erin S. Pearson, Robert Petrella, Patricia Tucker & Jennifer D. Irwin

Projected effects of climate change on boreal bird community accentuated by anthropogenic disturbances in western boreal forest, Canada

Philippe Cadieux, Yan Boulanger, Dominic Cyr, Anthony Taylor, David Price, Peter Solymos, Diana Stralberg, Han Chen, Aaron Brecka & Junior Tremblay
Aim Climate change is expected to influence boreal bird communities significantly, notably through changes in forest habitat (composition and age structure), in the coming decades. How these changes will accumulate and interact with anthropogenic disturbances remains an open question for most species. Location Northeastern Alberta, Canada. Methods We used the LANDIS-II forest landscape model to project changes in forest landscapes, and associated bird populations (72 passerine species), according to three climatic scenarios (baseline, RCP 4.5,...

Warming effect on ecosystem stability

Quan Quan, Fangyue Zhang, Lin Jiang, Han Y. H. Chen, Jinsong Wang, Fangfang Ma, Bing Song & Shuli Niu
1. Ecosystem stability is essential to its sustainable functions and services to humanity. Although climate warming is projected to vary from 1-5ºC by the end of 21st century, how the temporal stability of plant community biomass production responds to different warming scenarios remains unclear. 2. To fill this knowledge gap, we conducted a 6-year field experiment with three levels of warming treatments (control, + 1.5oC, + 5oC) by using infrared radiators, in an alpine meadow...

Data from: Functional and phylogenetic diversity promotes litter decomposition across terrestrial ecosystems

Wenya Xiao, Chen Chen, Xinli Chen, Zhiqun Huang & Han Chen
Aim: Litter decomposition is a vital process of carbon and nutrient cycling in terrestrial ecosystems. Despite rapid declines in plant diversity worldwide, the plant diversity effects on litter decomposition, along with the factors driving their directions and magnitudes, remain uncertain. Location: Globe. Time period: 1985-2018. Major taxa studied: Plants. Methods: By synthesizing 492 paired observations of leaf litter mixtures and monocultures from 110 studies, we conducted a global meta-analysis of the effects of litter mixtures...

Registration Year

  • 2020

Resource Types

  • Dataset
  • Text


  • Lakehead University
  • University of Alberta
  • Institute of Geographic Sciences and Natural Resources Research
  • McGill University
  • Georgia Institute of Technology
  • Fujian Normal University
  • Environment Canada
  • Queen Mary University of London
  • Western University
  • Middlesex London Health Unit