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Survival, gap formation, and recovery dynamics, in grassland ecosystems exposed to heat extremes : the role of species richness

(2001) ECOSYSTEMS. 4(8). p.797-806
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Abstract
A field experiment was performed in which the richness of perennial grasses (S) was varied in model ecosystems exposed to a simulated heat wave (free air temperature increase and drought). The proportion of individuals that survived the heat wave decreased with S, which could be ascribed to higher water consumption in the species-rich systems. Higher transpiration at high diversity was also observed in other studies using functional groups and could have originated from increased leaf area, less intense stomatal closure, or a combination of both. The increased tiller number per plant that we observed, while leaf area per tiller remained constant, suggests that an enhanced leaf area index was most likely responsible. However, competitive interactions also seemed to play a role in the influence of S on survival. Regrowth of the surviving individuals, expressed as leaf area per living plant after a recovery period following the heat wave, increased with S, most likely due to the dominance of productive species, which was facilitated by the additional space yielded by more intense gap formation at higher S (due to higher plant mortality). Species richness affected both the size and density of the gaps. Mean size increased exponentially with S, while density increased at low S but decreased at higher S when connectance of the gaps occurred. Size distribution of the gaps was not affected.
Keywords
community stability, gap formation, heat wave, perennial grasses, regrowth, resistance, species richness, BIODIVERSITY, STABILITY, DIVERSITY, PRODUCTIVITY, COMPLEXITY, MODEL, COMMUNITIES

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Chicago
Van Peer, Liesbeth, Ivan Nijs, Jan Bogaert, Iris Verelst, and Dirk Reheul. 2001. “Survival, Gap Formation, and Recovery Dynamics, in Grassland Ecosystems Exposed to Heat Extremes : the Role of Species Richness.” Ecosystems 4 (8): 797–806.
APA
Van Peer, L., Nijs, I., Bogaert, J., Verelst, I., & Reheul, D. (2001). Survival, gap formation, and recovery dynamics, in grassland ecosystems exposed to heat extremes : the role of species richness. ECOSYSTEMS, 4(8), 797–806.
Vancouver
1.
Van Peer L, Nijs I, Bogaert J, Verelst I, Reheul D. Survival, gap formation, and recovery dynamics, in grassland ecosystems exposed to heat extremes : the role of species richness. ECOSYSTEMS. 2001;4(8):797–806.
MLA
Van Peer, Liesbeth, Ivan Nijs, Jan Bogaert, et al. “Survival, Gap Formation, and Recovery Dynamics, in Grassland Ecosystems Exposed to Heat Extremes : the Role of Species Richness.” ECOSYSTEMS 4.8 (2001): 797–806. Print.
@article{443911,
  abstract     = {A field experiment was performed in which the richness of perennial grasses (S) was varied in model ecosystems exposed to a simulated heat wave (free air temperature increase and drought). The proportion of individuals that survived the heat wave decreased with S, which could be ascribed to higher water consumption in the species-rich systems. Higher transpiration at high diversity was also observed in other studies using functional groups and could have originated from increased leaf area, less intense stomatal closure, or a combination of both. The increased tiller number per plant that we observed, while leaf area per tiller remained constant, suggests that an enhanced leaf area index was most likely responsible. However, competitive interactions also seemed to play a role in the influence of S on survival. Regrowth of the surviving individuals, expressed as leaf area per living plant after a recovery period following the heat wave, increased with S, most likely due to the dominance of productive species, which was facilitated by the additional space yielded by more intense gap formation at higher S (due to higher plant mortality). Species richness affected both the size and density of the gaps. Mean size increased exponentially with S, while density increased at low S but decreased at higher S when connectance of the gaps occurred. Size distribution of the gaps was not affected.},
  author       = {Van Peer, Liesbeth and Nijs, Ivan and Bogaert, Jan and Verelst, Iris and Reheul, Dirk},
  issn         = {1432-9840},
  journal      = {ECOSYSTEMS},
  language     = {eng},
  number       = {8},
  pages        = {797--806},
  title        = {Survival, gap formation, and recovery dynamics, in grassland ecosystems exposed to heat extremes : the role of species richness},
  url          = {http://dx.doi.org/10.1007/s10021-001-0047-7},
  volume       = {4},
  year         = {2001},
}

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