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5 results for “Nutrient trapping”
On-shelf nutrient trapping enhances the fertility of the southern Benguela upwelling system
<p>The data submitted here is published in the manuscript entitled "On-shelf nutrient trapping enhances fertility of the southern Benguela upwelling system". Our data show that regenerated nutrients get “trapped” on the shelf of the southern Benguela upwelling system (SBUS), increasing the on-shelf nutrient pool available for upwelling. Nutrient trapping occurs when phytoplankton consume upwelled nutrients, sequestering them in their biomass, then sink and are decomposed on the shallow continental shelf, releasing nutrients to bottom waters. The nutrient-deplete surface waters subsequently flow offshore. SBUS nutrient trapping appears to be assisted by hydrographic fronts that limit the offshore transport of phytoplankton, such that their sinking and subsequent decomposition occurs on-shelf. Decomposition consumes oxygen, which means that enhanced nutrient trapping may increase oxygen depletion in the SBUS, with ecosystem-wide deleterious effects.</p> <p> </p>
Data from: Can differential nutrient extraction explain property variations in a predatory trap?
Predators exhibit flexible foraging to facilitate taking prey that offer important nutrients. Because trap-building predators have limited control over the prey they encounter, differential nutrient extraction and trap architectural flexibility may be used as a means of prey selection. Here, we tested whether differential nutrient extraction induces flexibility in architecture and stickiness of a spider's web by feeding Nephila pilipes live crickets (CC), live flies (FF), dead crickets with the web stimulated by flies (CD) or dead flies with the web stimulated by crickets (FD). Spiders in the CD group consumed less protein per mass of lipid or carbohydrate, and spiders in the FF group consumed less carbohydrates per mass of protein. Spiders from the CD group built stickier webs that used less silk, whereas spiders in the FF group built webs with more radii, greater catching areas and more silk, compared with other treatments. Our results suggest that differential nutrient extraction is a likely explanation for prey-induced spider web architecture and stickiness variations.
Litter–trapping tank bromeliads in five different forests: carbon and nutrient pools and fluxes
Bromeliads are the most abundant litter–trapping plants in Neotropical forest canopies. By intercepting litter, bromeliads obtain and retain nutrients before they reach the pedosphere. Here, we analyzed the litter captured and stored by tank bromeliads (TB) in five different forests along an elevation gradient in Mexico. Among those forests, carbon and nutrient pools and nitrogen fluxes in TB were estimated in a mangrove (MF) and a semi–deciduous tropical forest (SDTF). The composition of the litter trapped by TB along the gradient was similar to forest litterfall and was mainly composed of leaves. Most of the litter was captured in the dry season and we found a significant effect of projected plant area and the interaction between month and site on bromeliad litter capture. Moreover, litter stored in TB increased exponentially with projected plant area and differed between three studied species. In the MF (with ca. 2,700 TB ha<sup>-1</sup>), barely ca. 1% of annual litterfall is trapped by these plants, but even in the SDTF, with >10,000 TB ha<sup>-1</sup>, only ca. 2.4% is captured. We found that carbon and nitrogen pools in TB were small and represented < 1% of the carbon and nitrogen stored in forest aboveground biomass. Furthermore, the residence time of litter trapped in TB was not particularly large and was similar to that of litter on the forest floor. In light of our results, we conclude that in the studied forests the effect of TB on the forest carbon and nutrient cycle is negligible.
Data from: Can differential nutrient extraction explain property variations in a predatory trap?
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Litter–trapping tank bromeliads in five different forests: carbon and nutrient pools and fluxes
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