Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ecosystem-level stabilizing effects of biodiversity via
  nutrient-diversity feedbacks in multitrophic systems   Statistical averaging and asynchronous population dynamics as portfolio
mechanisms are considered as the most important processes with which
biodiversity contributes to ecosystem stability. However, portfolio theories
usually regard biodiversity as a fixed property, but overlook the dynamics of
biodiversity altered by other ecosystem components. Here, we proposed a new
mechanistic food chain model with nutrient-diversity feedback to investigate
how dynamics of phytoplankton species diversity determines ecosystem stability.
Our model focuses on nutrient, community biomass of phytoplankton and
zooplankton, and phytoplankton species richness. The model assumes diversity
effects of phytoplankton on trophic interaction strength along plankton food
chain: phytoplankton diversity influences nutrient uptake by phytoplankton and
zooplankton grazing on phytoplankton, which subsequently affects nutrient level
and community biomass of phytoplankton and zooplankton. The nutrient level in
turn affects phytoplankton diversity. These processes collectively form
feedbacks between phytoplankton diversity and dynamics of plankton and
nutrient. More importantly, nutrient-diversity feedback introduced additional
temporal variabilities in community biomass, which apparently implies a
destabilizing effect of phytoplankton diversity on ecosystem. However, the
variabilities made ecosystems more robust against extinction of plankton
because increasing phytoplankton diversity facilitates resource consumptions
when consumers prone to extinct; while, reducing diversity weakens
destabilizing dynamics caused by over-growth. Our results suggest the presence
of a novel stabilizing effect of biodiversity acting through nutrient-diversity
feedback, being independent of portfolio mechanisms.

15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
2
The categories of this paper are: math
23
The categories of this paper are: solv-int
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph