Six years after 'the Blob' in the Santa Barbara Channel, researchers find lasting effects in the kelp forest CommsBio nature
for the period 2003–2021. The number of heatwave days at each site were summed within each season in the time series and used to calculate the proportion of heatwave days per season at each site.
Sessile invertebrate and understory macroalgal communities were sampled twice seasonally from 2008 to 2013 and once seasonally from 2013 to winter of 2021. Data were not collected during the spring of 2020 due to research restrictions stemming from the COVID-19 pandemic. Uniform point contact surveys were performed by divers along a 40 m x 2 m permanent transect. Paired points were sampled every 0.5 m for a total of 80 points per transect.
. The total number of unique species encountered in 80 points per transect was used to measure sessile invertebrate species richness. Giant kelp was sampled along the same permanent transect and the total number of plants and stipes per plant were recorded and converted to biomass using established allometric relationships
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