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Multigenerational exposure to warming and fishing causes recruitment collapse, but size diversity and periodic cooling can aid recovery
Citation
Wootton, HF and Audzijonyte, A and Morrongiello, J, Multigenerational exposure to warming and fishing causes recruitment collapse, but size diversity and periodic cooling can aid recovery, Proceedings of the National Academy of Sciences of The United States of America, 118, (18) Article e2100300118. ISSN 0027-8424 (2021) [Refereed Article]
Copyright Statement
Copyright © 2021 National Academy of Sciences
DOI: doi:10.1073/pnas.2100300118
Abstract
Global warming and fisheries harvest are significantly impacting wild fish stocks, yet their interactive influence on population resilience to stress remains unclear. We explored these interactive effects on early-life development and survival by experimentally manipulating the thermal and harvest regimes in 18 zebrafish (Danio rerio) populations over six consecutive generations. Warming advanced development rates across generations, but after three generations, it caused a sudden and large (30–50%) decline in recruitment. This warming impact was most severe in populations where size-selective harvesting reduced the average size of spawners. We then explored whether our observed recruitment decline could be explained by changes in egg size, early egg and larval survival, population sex ratio, and developmental costs. We found that it was most likely driven by temperature-induced shifts in embryonic development rate and fishing-induced male-biased sex ratios. Importantly, once harvest and warming were relaxed, recruitment rates rapidly recovered. Our study suggests that the effects of warming and fishing could have strong impacts on wild stock recruitment, but this may take several generations to manifest. However, resilience of wild populations may be higher if fishing preserves sufficient body size diversity, and windows of suitable temperature periodically occur.
Item Details
| Item Type: | Refereed Article |
|---|---|
| Keywords: | fisheries, climate change, recruitment, long-term effects, selective fishing, size diveristy |
| Research Division: | Agricultural, Veterinary and Food Sciences |
| Research Group: | Fisheries sciences |
| Research Field: | Fisheries management |
| Objective Division: | Animal Production and Animal Primary Products |
| Objective Group: | Fisheries - wild caught |
| Objective Field: | Fisheries - wild caught not elsewhere classified |
| UTAS Author: | Audzijonyte, A (Dr Asta Audzijonyte) |
| ID Code: | 144202 |
| Year Published: | 2021 |
| Funding Support: | Australian Research Council (DP190101627) |
| Deposited By: | Ecology and Biodiversity |
| Deposited On: | 2021-04-27 |
| Last Modified: | 2021-10-13 |
| Downloads: | 0 |
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