Derived detected-behaviour layers from the MegaMove global tracking synthesis (Sequeira et al. 2025, Science): 11 million positions from 15,845 individuals across 121 species (whales & dolphins, sea turtles, sharks & fishes, seabirds, penguins, pinnipeds, sirenians, polar bears).
Three behaviour layers, each at 1° native resolution, keyed by taxonomic group with an
All taxa dissolved union, published as GeoParquet + PMTiles + H3 hex (resolution 4):
Taxa: Birds, Cetaceans (whales & dolphins), Fishes, Penguins, Polar bears,
Seals, Sirenians, Turtles, All taxa. (Corridors has no Sirenians — none detected.)
area_km2 = global area (km²) the taxon uses for that behaviour; time_frac = fraction of
tracked time spent in that behaviour (both from Sequeira et al. 2025). These are per-taxon
global constants. All three layers carry them — for IMMegAs (the corridor∪residence union)
area_km2 = total area used for any important behaviour and time_frac = fraction of time in
any important behaviour. The area_behaviours / time_behaviours CSV table assets on the
parent megamove collection give the full per-taxon, per-behaviour and in-EEZ breakdowns.
Use source-layer residencies / immegas for the other two PMTiles.
One row per (Taxon, h4) cell, hive-partitioned by h0. Native resolution 4 (≈ the 1° source grid).
area_km2 / time_frac on the hex layers are repeated identically on every cell of a taxon —
never SUM() them. To measure area within a region, use COUNT(DISTINCT h4) × (res-4 H3 cell area).
A fourth collection, megamove/tracked-individuals, holds the per-species grid: the number of
tracked individuals (nind) of each of the 111 species in each 1° cell, as a long-format
point layer (69,641 features), enriched with taxonomy (scientific_name, class, order,
family, derived taxon). It is a tracking-effort / sampling-density layer — where animals
were tagged and tracked, not unbiased abundance or space-use importance (use corridors/
residencies/immegas for behaviour).
Unlike the behaviour layers, nind is safe to SUM on the hex (points map 1:1 to res-4 cells) —
but an individual is counted once per 1° cell it occupied, so totals exceed the 15,845 unique animals.
PMTiles source-layer is tracked-individuals.