Data and R code for: Biogeography and conservation of bycatch decapods

Aim To investigate the spatial patterns of species richness (SR),
phylogenetic diversity (PD), and phylogenetic endemism (PE) in bycatch
decapod crustaceans along the Brazilian Exclusive Economic Zone and to
assess the influence of environmental variables and trawling effort on
these diversity indices. Location Brazilian Exclusive Economic Zone. Taxa
Decapoda Results Decapod diversity showed strong spatial heterogeneity
across the EEZ. SR peaked in southeastern Brazil in upwelling-influenced
ecotones, while PD and PE were highest in offshore and equatorial regions.
PD was strongly associated with bottom temperature, primary productivity
(PP) and current velocity, SR was mainly driven by salinity, light
availability, and PP, and PE was best explained by temperature and PP.
Most hotspots of phylogenetic diversity and endemism fell outside Marine
Protected Areas (MPAs), revealing significant conservation gaps in
offshore and southern regions. Main conclusions This study provides the
first macroecological framework of decapod diversity in the Brazilian EEZ,
revealing that temperature, salinity, productivity, and current dynamics
differentially shape biodiversity metrics. Southeastern and offshore zones
host unique evolutionary lineages but remain underrepresented in current
MPA networks. By integrating phylogenetic and environmental data, our
findings offer a baseline to improve spatial biodiversity assessments and
support more representative conservation planning under shifting ocean
conditions.