Directional trends in species composition over time can lead to a widespread overemphasis of year-to-year asynchrony

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12310%2F20%3A43901050" target="_blank" >RIV/60076658:12310/20:43901050 - isvavai.cz</a>

Alternative codes found

RIV/60077344:_____/20:00531627 RIV/67985939:_____/20:00531627 RIV/60460709:41330/20:82313 RIV/00216224:14310/20:00116729 RIV/00216208:11310/20:10424704

Result on the web

<a href="https://onlinelibrary.wiley.com/doi/10.1111/jvs.12916" target="_blank" >https://onlinelibrary.wiley.com/doi/10.1111/jvs.12916</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1111/jvs.12916" target="_blank" >10.1111/jvs.12916</a>

Result language

angličtina

Original language name

Directional trends in species composition over time can lead to a widespread overemphasis of year-to-year asynchrony

Original language description

Questions: Compensatory dynamics are described as one of the main mechanisms that increase community stability, e.g., where decreases of some species on a year-to-year basis are offset by an increase in others. Deviations from perfect synchrony between species (asynchrony) have therefore been advocated as an important mechanism underlying biodiversity effects on stability. However, it is unclear to what extent existing measures of synchrony actually capture the signal of year-to-year species fluctuations in the presence of long-term directional trends in both species abundance and composition (species directional trends hereafter). Such directional trends may lead to a misinterpretation of indices commonly used to reflect year-to-year synchrony. Methods: An approach based on three-term local quadrat variance (T3) which assesses population variability in a three-year moving window, was used to overcome species directional trend effects. This &quot;detrending&quot; approach was applied to common indices of synchrony across a worldwide collection of 77 temporal plant community datasets comprising almost 7,800 individual plots sampled for at least six years. Plots included were either maintained under constant &quot;control&quot; conditions over time or were subjected to different management or disturbance treatments. Results: Accounting for directional trends increased the detection of year-to-year synchronous patterns in all synchrony indices considered. Specifically, synchrony values increased significantly in similar to 40% of the datasets with theT3 detrending approach while in similar to 10% synchrony decreased. For the 38 studies with both control and manipulated conditions, the increase in synchrony values was stronger for longer time series, particularly following experimental manipulation. Conclusions: Species&apos; long-term directional trends can affect synchrony and stability measures potentially masking the ecological mechanism causing year-to-year fluctuations. As such, previous studies on community stability might have overemphasised the role of compensatory dynamics in real-world ecosystems, and particularly in manipulative conditions, when not considering the possible overriding effects of long-term directional trends.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10618 - Ecology

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2020

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Vegetation Science

ISSN

1100-9233

e-ISSN

—

Volume of the periodical

31

Issue of the periodical within the volume

5

Country of publishing house

US - UNITED STATES

Number of pages

11

Pages from-to

792-802

UT code for WoS article

000553661300001

EID of the result in the Scopus database

2-s2.0-85088802359