气候变化领域集成服务门户(CCPortal): Coordinated distributed experiments in ecology do not consistently reduce heterogeneity in effect size

CCPortal

DOI	10.1111/oik.10722
	Coordinated distributed experiments in ecology do not consistently reduce heterogeneity in effect size
	Bebout, Julia; Fox, Jeremy W.
发表日期	2024
ISSN	0030-1299
EISSN	1600-0706
起始页码	2024
结束页码	6
卷号	2024 期号:6
英文摘要	Ecological meta-analyses usually exhibit high relative heterogeneity of effect size: most among-study variation in effect size represents true variation in mean effect size, rather than sampling error. This heterogeneity arises from both methodological and ecological sources. Methodological heterogeneity is a nuisance that complicates the interpretation of data syntheses. One way to reduce methodological heterogeneity is via coordinated distributed experiments, in which investigators conduct the same experiment at different sites, using the same methods. We tested whether coordinated distributed experiments in ecology exhibit 1) low heterogeneity in effect size, and 2) lower heterogeneity than meta-analyses, using data on 17 effects from eight coordinated distributed experiments, and 406 meta-analyses. Consistent with our expectations, among-site heterogeneity typically comprised <50% of the variance in effect size in distributed experiments. In contrast, heterogeneity within and among studies typically comprised >90% of the variance in effect size in meta-analyses. However, this difference largely reflected the small size of most coordinated distributed experiments, and was no longer significant after controlling for size (number of studies or sites). These results are consistent with the hypothesis that methodological heterogeneity rarely comprises a substantial fraction of variance in effect size in ecology. We also conducted pairwise comparisons of absolute heterogeneity between coordinated distributed experiments and meta-analyses on the same topics. Coordinated distributed experiments did not consistently exhibit lower absolute heterogeneity in effect size than meta-analyses on the same topics. Our findings suggest that coordinated distributed experiments rarely increase uniformity of results by reducing methodological heterogeneity. Our results help refine the numerous distinct reasons for conducting coordinated distributed experiments.
英文关键词	distributed experiment; effect size; heterogeneity; hierarchical random effects model; meta-analysis
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Ecology
WOS记录号	WOS:001198297200001
来源期刊	OIKOS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/301434
作者单位	University of Calgary
推荐引用方式 GB/T 7714	Bebout, Julia,Fox, Jeremy W.. Coordinated distributed experiments in ecology do not consistently reduce heterogeneity in effect size[J],2024,2024(6).
APA	Bebout, Julia,&Fox, Jeremy W..(2024).Coordinated distributed experiments in ecology do not consistently reduce heterogeneity in effect size.OIKOS,2024(6).
MLA	Bebout, Julia,et al."Coordinated distributed experiments in ecology do not consistently reduce heterogeneity in effect size".OIKOS 2024.6(2024).