Changes in invertebrate food web structure between high- and low-productivity environments are driven by intermediate but not top-predator diet shifts

被引：3

作者：

Miller-ter Kuile, Ana ^{[1
,2
,3
]}

Apigo, Austen ^{[1
]}

Bui, An ^{[1
]}

Butner, Kirsten ^{[1
,4
]}

Childress, Jasmine N. N. ^{[1
]}

Copeland, Stephanie ^{[1
]}

DiFiore, Bartholomew P. P. ^{[1
]}

Forbes, Elizabeth S. S. ^{[1
,5
]}

Klope, Maggie ^{[1
]}

Motta, Carina I. I. ^{[1
,6
]}

Orr, Devyn ^{[1
,7
]}

Plummer, Katherine A. A. ^{[8
]}

Preston, Daniel L. L. ^{[9
]}

Young, Hillary S. S. ^{[1
]}

机构：

[1] Univ Calif Santa Barbara, Ecol Evolut Marine Biol Dept, Santa Barbara, CA 93106 USA

[2] No Arizona Univ, Sch Informat Comp & Cyber Syst, Flagstaff, AZ 86011 USA

[3] USDA Forest Serv, Rocky Mt Res Stn, Flagstaff, AZ 59644 USA

[4] Johns Hopkins Bloomberg Sch Publ Hlth, Dept Mol Microbiol & Immunol, Baltimore, MD USA

[5] Yale Univ, Yale Sch Environm, New Haven, CT USA

[6] Univ Estadual Paulista, Dept Biodiversidade, Ave 24 A,1515-Bela Vista, BR-13506752 Rio Claro, SP, Brazil

[7] ARS, USDA, Eastern Oregon Agr Res Ctr, Burns, OR USA

[8] Stanford Univ, Dept Biol, Stanford, CA USA

[9] Colorado State Univ, Dept Fish Wildlife & Conservat Biol, Ft Collins, CO USA

来源：

BIOLOGY LETTERS | 2022年 / 18卷 / 10期

基金：

美国国家科学基金会;

关键词：

food chain; Araneae; diet DNA metabarcoding; stable isotope analysis; BIODIVERSITY; DIVERSITY; STABILITY; COMMUNITY; SIZE;

D O I：

10.1098/rsbl.2022.0364

中图分类号：

Q [生物科学];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Predator-prey interactions shape ecosystem stability and are influenced by changes in ecosystem productivity. However, because multiple biotic and abiotic drivers shape the trophic responses of predators to productivity, we often observe patterns, but not mechanisms, by which productivity drives food web structure. One way to capture mechanisms shaping trophic responses is to quantify trophic interactions among multiple trophic groups and by using complementary metrics of trophic ecology. In this study, we combine two diet-tracing methods: diet DNA and stable isotopes, for two trophic groups (top predators and intermediate predators) in both low- and high-productivity habitats to elucidate where in the food chain trophic structure shifts in response to changes in underlying ecosystem productivity. We demonstrate that while top predators show increases in isotopic trophic position (delta N-15) with productivity, neither their isotopic niche size nor their DNA diet composition changes. Conversely, intermediate predators show clear turnover in DNA diet composition towards a more predatory prey base in high-productivity habitats. Taking this multi-trophic approach highlights how predator identity shapes responses in predator-prey interactions across environments with different underlying productivity, building predictive power for understanding the outcomes of ongoing anthropogenic change.

引用

页数：6