  The discourse surrounding the structural organization of mutualistic
interactions mostly revolves around modularity and nestedness. The former is
known to enhance the stability of communities, while the latter is related to
their feasibility, albeit compromising the stability. However, it has recently
been shown that the joint emergence of these structures poses challenges that
can eventually lead to limitations in the dynamic properties of mutualistic
communities. We hypothesize that considering compound arrangements -- modules
with internal nested organization -- can offer valuable insights in this
debate. We analyze the temporal structural dynamics of 20 plant-pollinator
interaction networks and observe large structural variability throughout the
year. Compound structures are particularly prevalent during the peak of the
pollination season, often coexisting with nested and modular arrangements in
varying degrees. Motivated by these empirical findings, we synthetically
investigate the dynamics of the structural patterns across two control
parameters -- community size and connectance levels -- mimicking the
progression of the pollination season. Our analysis reveals contrasting impacts
on the stability and feasibility of these mutualistic communities. We
characterize the consistent relationship between network structure and
stability, which follows a monotonic pattern. But, in terms of feasibility, we
observe non-linear relationships. Compound structures exhibit a favorable
balance between stability and feasibility, particularly in mid-sized ecological
communities, suggesting they may effectively navigate the simultaneous
requirements of stability and feasibility. These findings may indicate that the
assembly process of mutualistic communities is driven by a delicate balance
among multiple properties, rather than the dominance of a single one.
