Pulsed pressure: Fluctuating impacts of multifactorial environmental change on a temperate macroalgal community

Martin Wahl, Francisco R. Barboza, Björn Buchholz, Sergey Dobretsov, Tamar Guy-Haim, Gil Rilov, Renate Schuett, Fabian Wolf, Jahangir Vajedsamiei, Maryam Yazdanpanah, Christian Pansch

Research output: Contribution to journalArticlepeer-review

Abstract

Global change impacts marine organisms and communities mainly through ocean warming, acidification, deoxygenation, and changes in nutrient inputs and water circulation. To assess the ecological impacts of global change, the effects of multiple interacting environmental drivers, including their fluctuations, should be tested at different levels of biological organization. In an outdoor mesocosm study, we investigated the differential effects of three simulated upwelling events coupled with ocean warming (1–5°C above ambient) on a temperate benthic community in the Western Baltic Sea. Ocean warming, especially in summer when temperatures are close to or above the physiological optimum of many species, is likely to impose thermal stress with species-specific impacts. As the properties of deep water vary seasonally, so will the effects of upwelling. Upwelling of cooler deep water in midsummer may alleviate thermal stress, although this mitigation may be modulated by upwelling-associated shifts in other water-quality parameters such as salinity, nutrients, or late-summer hypoxia. This investigation showed that in the Western Baltic Ocean warming was rather beneficial in early and late summer but detrimental when ambient temperatures were highest in midsummer. The effects of upwelling in the absence of ocean warming were generally weakly beneficial, while this effect tended to vanish with intensifying imposed ocean warming. Hypoxia associated with the late summer upwelling impacted some of the grazer species but did not impact the macroalgae. We conclude that in coastal temperate benthic communities, ocean warming is the predominant stressor that may partially and seasonally be buffered by upwelling.

Original languageEnglish
Pages (from-to)4210-4226
Number of pages17
JournalLimnology and Oceanography
Volume66
Issue number12
DOIs
StatePublished - Dec 2021
Externally publishedYes

Bibliographical note

Funding Information:
We gratefully acknowledge the financial and logistic support by the German Ministry of Education and Research (BMBF) in the project BIOMOD (FKZ 03F0821A) and the EU funded project AQUACOSM (project no. 731065, EU H2020‐INFRAIA). We are grateful for the valuable support by Renate Schütt, Nadja Staerck, and Claas Hiebenthal (all GEOMAR, Kiel). Open access funding enabled and organized by Projekt DEAL.

Funding Information:
We gratefully acknowledge the financial and logistic support by the German Ministry of Education and Research (BMBF) in the project BIOMOD (FKZ 03F0821A) and the EU funded project AQUACOSM (project no. 731065, EU H2020-INFRAIA). We are grateful for the valuable support by Renate Sch?tt, Nadja Staerck, and Claas Hiebenthal (all GEOMAR, Kiel). Open access funding enabled and organized by Projekt DEAL.

Publisher Copyright:
© 2021 The Authors. Limnology and Oceanography published by Wiley Periodicals LLC on behalf of Association for the Sciences of Limnology and Oceanography.

ASJC Scopus subject areas

  • Oceanography
  • Aquatic Science

Fingerprint

Dive into the research topics of 'Pulsed pressure: Fluctuating impacts of multifactorial environmental change on a temperate macroalgal community'. Together they form a unique fingerprint.

Cite this