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6 results for “Pyric herbivory”
Fire and forage quality: post-fire regrowth quality and pyric herbivory in subtropical grasslands of Nepal
<p>Indiscriminate fire is rampant throughout subtropical South and Southeast Asian grasslands. However, very little is known about the role of fire and pyric herbivory on the functioning of highly productive subtropical monsoon grasslands lying within Cwa-climatic region. We collected grass samples from 60 m x 60 m plots and determined vegetation physical and chemical properties at regular 30-day intervals from April to July 2020, starting from 30 days after fire to assess post-fire regrowth forage quality. We counted pellet groups for the same four months from 2 m x 2 m quadrats that were permanently marked with pegs along the diagonal of each 60 m x 60 m plot to estimate grazing intensity to the progression of post-fire regrowth. We observed strong and significant reductions in crude protein (mean value 9.1 to 4.1 [55% decrease]) and phosphorus (mean value 0.2 to 0.11 [45% decrease]) in forage collected during different time intervals i.e., from 30 days to 120 days after fire. Mesofaunal deer utilised the burned areas extensively for a short period, <i>i.e</i>., up to two months after fire when the burned areas contained short grasses with a higher level of crude protein and phosphorus. Grazing intensity of chital (<i>Axis axis</i>) to post-fire regrowth differed significantly over time since fire, with higher intensity of use at 30 days after fire. Grazing intensity of swamp deer (<i>Rucervus duvaucelii</i>) did not differ significantly until 90 days after fire, however, decreased significantly after 90 days since fire. Large-scale indiscriminate single event fires thus may not fulfil nutritional requirements of all species in mesofaunal deer community in these subtropical monsoon grasslands. We recommend for a spatio-temporal manipulation of fire to reinforce grazing feedback and to yield for the longest possible period a reasonably good food supply for the conservation of mesofaunal deer.</p>
Fire and forage quality: post-fire regrowth quality and pyric herbivory in subtropical grasslands of Nepal
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Data from: Pyric herbivory, scales of heterogeneity, and drought
1. Understanding how extreme drought alters spatial patterns and temporal stability in grassland biomass will become increasingly important by the end of the century when climate model forecasts suggest drought events will occur more frequently. In grassland landscapes where grazing is driven by fire (termed pyric herbivory), temporal stability in aboveground plant biomass at landscape scales typically coincides with greater spatial variability across local communities (time-since fire patches), whereas variability within local communities is associated with lower temporal stability. 2. We assess the robustness of this relationship during one of the most severe droughts on modern record in the southern Great Plains. We use a long-term pyric herbivory experiment to test whether extreme drought: 1) changes patterns of spatial variability in aboveground plant biomass among or within local communities, 2) changes the temporal stability in aboveground plant biomass and the relationship between spatial variability and temporal variability, and 3) changes the underlying feedback mechanisms associated with pyric herbivory. Ordination revealed a shift from spatially distinct patches before drought to a convergence of patches during drought in terms of aboveground plant biomass and crude protein. 3. Permutation tests revealed that within-patch variability in aboveground plant biomass significantly increased during drought compared to pre-drought levels. Temporal stability in aboveground plant biomass decreased during drought and indeed corresponded with reduced variability in biomass among local communities and increased variability within local communities compared to pre-drought levels. 4. The results from this study strongly suggest that both positive and negative feedback loops responsible for pyric herbivory were maintained by scale-switching during periods of extreme drought and further reinforce the importance of scale in the study of pattern-process relationships.
Data from: Effect of pyric herbivory on source-sink dynamics in grassland birds
Grasslands world-wide provide a host of ecosystem services. In particular, these grasslands serve as biodiversity repositories for a myriad of imperilled animal species. One such group is grassland birds, which have experienced significant declines, predominantly caused by extensive loss and degradation of native grasslands. Rangeland management that promotes increasing and sustaining livestock production through reducing the inherent, disturbance-driven variability that historically occurred in grasslands is considered a major contributing factor to these declines. An alternative approach to this homogeneous management paradigm attempts to restore a shifting mosaic of disturbance patches across the landscape through the spatial and temporal interactions of fire and grazing (i.e. pyric herbivory). Application of pyric herbivory through patch-burn grazing increases overall habitat heterogeneity, likely a critically important factor in maintaining and enhancing grassland bird populations. We compared reproductive rates and estimates of fecundity of three grassland birds nesting in grasslands maintained by traditional and patch-burn grazing management paradigms in the Southern Great Plains of North America. Additionally, we used a sensitivity analysis approach to assess population stability (i.e. λ = 1) and source–sink population dynamics under the two management practices. Nest survival for dickcissels Spiza americana and grasshopper sparrows Ammodramus savannarum was higher in patch-burned grasslands than in traditionally managed grasslands, while nest survival for eastern meadowlarks Sturnella magna was higher in traditionally managed grasslands than in patch-burned grasslands. Dickcissels and grasshopper sparrows responded positively to patch burning with source habitats occurring over a wider range of survival rates under patch burning than traditional management, while no clear pattern emerged in source–sink dynamics of eastern meadowlarks. Synthesis and applications. Management strategies such as patch-burn grazing offer opportunities to restore landscape heterogeneity to benefit bird communities while maintaining livestock production goals. Applying patch-burn grazing to rangelands can increase productivity of grassland birds and could be effective for reversing the decline of grassland birds by providing source habitats more consistently than traditional rangeland management. Our results emphasize the utility of using sensitivity analyses to determine source–sink population dynamics when evaluating management practices. However, land managers should consider that source–sink models have shortcomings and designation of a habitat as a sink does not necessarily mean the habitat has low conservation value.
Data from: Effect of pyric herbivory on source-sink dynamics in grassland birds
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Data from: Pyric herbivory, scales of heterogeneity, and drought
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