Alternations in the foraging behaviour of a primary consumer drive patch transition dynamics in a temperate rocky reef ecosystem. (29th June 2022)

• Record Type: Journal Article
• Authors: Smith, Joshua G.; Tinker, M. Tim
• Is Part Of: Ecology letters. Volume 25:Number 8(2022)
• Page Start: 1827
• Page End: 1838
• Publication Date: 2022-06-29
• Subjects: alternative stable states -- behaviour -- kelp forest -- patch dynamics -- trophic cascades; Ecology -- Periodicals; 577
• DOI: 10.1111/ele.14064
• Languages: English
• ISSNs: 1461-023X

Abstract

Abstract: Understanding the role of animal behaviour in linking individuals to ecosystems is central to advancing knowledge surrounding community structure, stability and transition dynamics. Using 22 years of long‐term subtidal monitoring, we show that an abrupt outbreak of purple sea urchins ( Strongylocentrotus purpuratus ), which occurred in 2014 in southern Monterey Bay, California, USA, was primarily driven by a behavioural shift, not by a demographic response (i.e. survival or recruitment). We then tracked the foraging behaviour of sea urchins for 3 years following the 2014 outbreak and found that behaviour is strongly associated with patch state (forest or barren) transition dynamics. Finally, in 2019, we observed a remarkable recovery of kelp forests at a deep rocky reef. We show that this recovery was associated with sea urchin movement from the deep reef to shallow water. These results demonstrate how changes in grazer behaviour can facilitate patch dynamics and dramatically restructure communities and ecosystems. Abstract : Understanding the role of animal behavior in linking individuals to ecosystems is central to advancing knowledge surrounding community structure, stability, and transition dynamics. Using 22‐years of long‐term subtidal monitoring, we show that an abrupt outbreak of purple sea urchins (Strongylocentrotus purpuratus) in southern Monterey Bay, California, USA, was primarily driven by a behavioral shift, not by a demographic response (i.e., survival or recruitment). We then tracked the behavior (passive or active grazing) of sea urchins for three years following the 2014 outbreak and found that behavior is strongly associated with patch state (forest or barren) transition dynamics. Image credit: Patrick Webster.