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Introduction

This report summarizes the status of a type of canopy kelp (macrocystis or nereocystsis at particular site using drone-based imagery. The analysis includes the application of tide corrections, calculation of averages, and visualization of the data.

Site Trend

Error bars = max and min of tide correction coefficient applied

Red line = Entire Time series average (baseline)

Green line = First 5 year average (baseline)

Blue line = overall trend with p-value :

## [1] 0.2235901
## `geom_smooth()` using formula = 'y ~ x'

year PRNPR_entire_series Haida_Gwaii_entire_series PRNPR_first_5years Haida_Gwaii_first_5years
2016 decrease no trend decrease decrease
2017 large increase increase large increase increase
2018 increase increase increase no trend
2019 decrease no trend decrease decrease
2020 increase no trend decrease no trend
2021 decrease no trend decrease no trend
2022 increase no trend increase no trend
2023 increase no trend decrease no trend
2024 decrease no trend decrease decrease
year perc_change_area_to_mean_whole_time_series perc_change_area_to_mean_first_5_years
2016 -19 -26
2017 70 55
2018 32 20
2019 -24 -30
2020 -10 -18
2021 -18 -25
2022 -1 -10
2023 -10 -18
2024 -21 -28
PRNPR definitions :

large increase = over 50% more than baseline

increase = 15-50% more than baseline

no trend = 15 more or less than baseline

decrease = 15-50% less than baseline

large decrease = over 50% less than baseline

Haida_Gwaii definitions :

large increase = over 75% more than baseline

increase = 25-75% more than baseline

no trend = 25 more or less than baseline

decrease = 25-75% less than baseline

large decrease = over 75% less than baseline

Region Trend

Error bars = average of max and min from tide correction coefficient applied

Red line = Entire Time series average (baseline)

Green line = First 5 year average (baseline)

Blue line = overall trend with p-values:

##                 (Intercept) year:canopy_typemacrocystis 
##                 0.007806608                 0.007888144 
## year:canopy_typenereocystis 
##                 0.007950834
## `geom_smooth()` using formula = 'y ~ x'

year PRNPR_entire_series Haida_Gwaii_entire_series PRNPR_first_5years Haida_Gwaii_first_5years
2014 limited data limited data limited data limited data
2015 limited data limited data large increase large increase
2016 limited data limited data increase no trend
2017 limited data limited data decrease decrease
2018 large increase no trend decrease decrease
2019 increase no trend decrease decrease
2020 increase no trend decrease decrease
2021 increase no trend decrease decrease
2022 decrease decrease large decrease large decrease
2023 increase no trend large decrease large decrease
2024 increase no trend large decrease large decrease
year perc_change_area_to_mean_whole_time_series perc_change_area_to_mean_first_5_years
2014 1143 398
2015 358 84
2016 228 31
2017 101 -20
2018 64 -34
2019 48 -41
2020 47 -41
2021 33 -47
2022 -40 -76
2023 7 -57
2024 -5 -62
year PRNPR_entire_series Haida_Gwaii_entire_series PRNPR_first_5years Haida_Gwaii_first_5years
2016 increase no trend increase no trend
2017 large increase large increase large increase large increase
2018 increase no trend increase no trend
2019 increase no trend increase no trend
2020 increase no trend increase no trend
2021 increase no trend increase no trend
2022 increase no trend increase no trend
2023 increase no trend increase no trend
2024 increase no trend increase no trend
year perc_change_area_to_mean_whole_time_series perc_change_area_to_mean_first_5_years
2016 46 46
2017 75 75
2018 6 6
2019 3 3
2020 10 10
2021 18 18
2022 35 35
2023 27 27
2024 31 31