Archives Antarctiques Belges – Belgische Antarctische Archieven (AABBAA – asbl) and APECS Belgium are proud to present a conference evening where researchers share their findings and experiences in Antarctica!
Belgium and Antarctica… Researchers’ views 21 March 2018 (Wednesday) 19:00 Campus Solbosch, ULB Building D Local DC2.223 Open to public and FREE of charge!
AABBAA is a non-profit organization which gathers archives on Belgian Antarctic expeditions. Please join us for this great initiative!
Request for all occurrence records of these threatened species within antarctic and subantarctic zone from OBIS.
# get the occurrence of these threatened species from OBIS using API
# polygon include antarctic and subantarctic area
occ <- occurrence(scientificname = not.lc.dd$scientific_name, geometry = "POLYGON((180 -90, -180 -90, -180 -45, 180 -45, 180 -90))")
# convert eventDate from string to date time format
occ$eventDate <- as.POSIXct(strptime(occ$eventDate, format = "%Y-%m-%d %H:%M:%S", tz = "GMT"))
occ$month <- as.numeric(format(occ$eventDate, "%m"))
occ$year <- as.numeric(format(occ$eventDate, "%Y"))
obs <- occ %>% filter(year == 2003)
# remove preservedSpecimen occurrences
obs <- occ %>% filter(basisOfRecord != "PreservedSpecimen")
Plot orthographic projected map and animate with gganimate
Plot map with orthographic projection from South Pole and add a layer of occurrences, color by genus.
Animate the plots and create a gif file called occ_by_month.gif
# plot map with orthographic projection from South Pole
world <- map_data("world")
## long lat group order region subregion
## 1 -69.89912 12.45200 1 1 Aruba
## 2 -69.89571 12.42300 1 2 Aruba
## 3 -69.94219 12.43853 1 3 Aruba
## 4 -70.00415 12.50049 1 4 Aruba
## 5 -70.06612 12.54697 1 5 Aruba
## 6 -70.05088 12.59707 1 6 Aruba
Please note that this exercise is not based on science. For instance, there are a lot more occurrence records from November to March, maybe because there are more people at field in Antarctica during that period. I am assuming that all occurrences here means presence. Not observing an occurrence do not means its absence either.