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Trends in radar counts of Marbled Murrelets Brachyramphus marmoratus in British Columbia (1996-2018): Effects of 'The Blob' marine heatwave and prey fish abundance.
Citation
DREVER, M.C., MCALLISTER, M.K., BERTRAM, D.F., SCHROEDER, B.K. & WOO, K.J. 2021. Trends in radar counts of Marbled Murrelets Brachyramphus marmoratus in British Columbia (1996-2018): Effects of 'The Blob' marine heatwave and prey fish abundance.. Marine Ornithology 49: 37 - 49
Received 17 April 2020, accepted 09 October 2020
Date Published: 2021/04/15
Date Online: 2021/02/02
Key words: Brachyramphus marmoratus, radar counts, marine heatwave, Pacific Herring, sea surface temperature, trends
Abstract
During 2014-2016, the northeast Pacific Ocean experienced a large-scale marine heatwave (nicknamed ‘The Blob'), an event that was associated with die-offs of several marine bird species. The Marbled Murrelet Brachyramphus marmoratus is a small seabird in this region for which we evaluated trends in abundance—for the purposes of conservation planning—during radar surveys at 58 sites in coastal British Columbia, from 1996 to 2018, and for which we determined whether trends may have been affected by ‘The Blob'. A hierarchical Bayesian model allowed us to separate long-term trends from short-term annual fluctuations (‘year effects') that might have resulted from changes in ocean conditions, and it also allowed us to test whether predicted regional counts were associated with two indices of marine conditions: (1) measured abundance of a prey species, Pacific Herring Clupea pallasii; and (2) sea surface temperature (SST). Province-wide mean annual rate of change in counts was significantly negative, with a posterior median of -0.023 (95% credible interval: -0.033, -0.014); mean rate of change in counts per year was negative for all six Marbled Murrelet Conservation Regions; and trends were significantly negative at the Central Mainland Coast, East Vancouver Island, Haida Gwaii, and the South Mainland Coast conservation regions. Year effects during or after ‘The Blob' at West and North Vancouver Island (2016) and East Vancouver Island (2018) conservation regions were not statistically significant. Mean predicted regional counts of murrelets showed weakly positive correlations with age two herring recruitment, and no consistent associations with SST. These results indicate that the marine heatwave did not strongly affect forest-bound murrelets, and are consistent with the hypothesis that ongoing loss of terrestrial nesting habitat is associated with population declines of Marbled Murrelets in British Columbia.
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