2004 | Jane Memmott, Nickolas M. Waser, and Mary V. Price
Pollination networks show greater tolerance to species extinction compared to standard food webs. This study simulated the removal of pollinators and observed the resulting plant extinctions in two large pollination networks. Plant diversity declined most rapidly when the most-linked pollinators were removed, but declines were not worse than linear. This tolerance is due to pollinator redundancy and nested network topology. Unlike food webs, where removal of highly connected species leads to catastrophic declines, pollination networks show more resilience.
The study used data from two networks: Clements & Long (C&L) and Robertson (R). Pollinators were removed randomly, systematically from least to most linked, and vice versa. Random removal caused a gradual decline in plant species, with most extinctions occurring after 70-80% of pollinators were lost. Systematic removal starting with least-linked pollinators led to a more dramatic decline, with plants disappearing rapidly once all pollinators were removed. Conversely, removing most-linked pollinators first resulted in a more rapid but linear decline in plant species.
Pollination networks are characterized by scale-free degree distributions and nestedness. Nestedness means that generalist pollinators interact with a broader range of plants, while specialists interact with a subset of those plants. This structure contributes to the resilience of pollination networks. Redundancy in pollinators and nestedness help maintain plant diversity even when some pollinators are lost.
The study highlights the importance of generalist pollinators, such as bumble-bees and some solitary bees, in maintaining pollination networks. These species are at higher risk of extinction and should be prioritized in conservation efforts. The results suggest that pollination networks are more resilient to extinction than food webs, but this does not mean they are immune. Conservation strategies should focus on protecting generalist pollinators and maintaining the structure of pollination networks to ensure the survival of plant-pollinator interactions.Pollination networks show greater tolerance to species extinction compared to standard food webs. This study simulated the removal of pollinators and observed the resulting plant extinctions in two large pollination networks. Plant diversity declined most rapidly when the most-linked pollinators were removed, but declines were not worse than linear. This tolerance is due to pollinator redundancy and nested network topology. Unlike food webs, where removal of highly connected species leads to catastrophic declines, pollination networks show more resilience.
The study used data from two networks: Clements & Long (C&L) and Robertson (R). Pollinators were removed randomly, systematically from least to most linked, and vice versa. Random removal caused a gradual decline in plant species, with most extinctions occurring after 70-80% of pollinators were lost. Systematic removal starting with least-linked pollinators led to a more dramatic decline, with plants disappearing rapidly once all pollinators were removed. Conversely, removing most-linked pollinators first resulted in a more rapid but linear decline in plant species.
Pollination networks are characterized by scale-free degree distributions and nestedness. Nestedness means that generalist pollinators interact with a broader range of plants, while specialists interact with a subset of those plants. This structure contributes to the resilience of pollination networks. Redundancy in pollinators and nestedness help maintain plant diversity even when some pollinators are lost.
The study highlights the importance of generalist pollinators, such as bumble-bees and some solitary bees, in maintaining pollination networks. These species are at higher risk of extinction and should be prioritized in conservation efforts. The results suggest that pollination networks are more resilient to extinction than food webs, but this does not mean they are immune. Conservation strategies should focus on protecting generalist pollinators and maintaining the structure of pollination networks to ensure the survival of plant-pollinator interactions.