DOI: 10.5061/dryad.d1d4177
title: Data from: A global estimate of terrestrial net secondary production of primary consumers

description: Aim: Net Secondary production (NSP) emerges from the consumption of Net
 Primary Production (NPP) by any heterotrophic organism. There has been
 sporadic interest in the importance of NSP, but no global estimates have
 been produced. We revisit NSP and attempt a global estimate using
 contemporary NPP data combined with modern metabolic scaling theory for
 consumption rates. We distinguish between potential NSP as the amount of
 secondary production that could be supported by NPP, and realized NSP as
 the amount remaining after anthropogenic habitat disruption. Location:
 Global Time period: 2000-2014 Methods: We present a model of NSP
 implementing a Type II functional response for consumption rates wherein
 search efficiency and handling time are calculated based on consumer mass
 and ambient temperature. We solve this model for each 0.05-decimal-degree
 pixel in the global terrestrial biosphere using as data inputs NPP
 (MOD17A3) and land-surface temperature (MOD11C3). We aggregate estimates
 within global land cover classifications (MCD12C1) to obtain
 cover-specific and global estimates of NSP. We also correct our estimates
 based on declines in consumer abundance reported in Living Planet Report
 2014. Results: We estimate potential NSP is 4.74 PgCy-1 globally
 (95%~CI~=~3.75--5.75). When we correct for global consumer population
 declines, realized NSP declines to 2.37 PgCy-1 (95%~CI~=~1.86--2.89), a
 loss of 50% in the rate of carbon flux through secondary consumers. Main
 Conclusions: Our estimates are sufficient to suggest that the flux of
 carbon through consumers is of a similar magnitude to many other fluxes
 critical to the global carbon cycle. We view this as a hypothesis to be
 tested that suggests NSP deserves significantly more attention in earth
 systems, macroecology, and biogeochemical research.
description: Average Global
 Consumption of NPPThis is a dataset of
 expected average terrestrial consumption of NPP by primary consumers and
 reducers. The data layer is a 0.05-decimal-degree resolution raster in
 latitude/longitude (WGS 1984). Pixel units are in grams of carbon consumed
 per meter squared per year (g C m^-2 y^-1). For details regarding creation
 of this data, please see the referenced manuscript.consumption.tifAverage Potential Net Secondary ProductionThis is a dataset of expected average terrestrial potential Net Secondary Production (NSP) by primary consumers and reducers. Potential NSP is the amount of carbon production by primary consumers and reducers based on foraging and metabolic theory. The data layer is a 0.05-decimal-degree resolution raster in latitude/longitude (WGS 1984). Pixel units are in grams of carbon produced per meter squared per year (g C m^-2 y^-1). For details regarding creation of this data, please see the referenced manuscript.potential_NSP.tifAverage Realized Net Secondary ProductionThis is a dataset of expected average terrestrial realised Net Secondary Production (NSP) by primary consumers and reducers. Realized NSP is what is expected to remain of potential NSP after accounting for reported global declines in population abundance from the Living Planet Index 2014. The data layer is a 0.05-decimal-degree resolution raster in latitude/longitude (WGS 1984). Pixel units are in grams of carbon produced per meter squared per year (g C m^-2 y^-1). For details regarding creation of this data, please see the referenced manuscript.realized_NSP.tif