Effect of sheep grazing and fire on sage grouse populations in southeastern Idaho

Pedersen, Ellen K.; Connelly, J.W.; Hendrickson, John; Grant, William E.

doi:10.1016/s0304-3800(02)00382-4

Cited by 28 publications

(22 citation statements)

References 34 publications

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“…Sagebrush community connectivity needs to be maintained for migration corridors. The natural spread of Wyoming big sagebrush over time tends to occur slowly (Monsen et al, 2004;Pedersen et al, 2003), but land managers may be able to hasten the process by seeding sagebrush following fire. Currently, the BLM encourages sagebrush seedlings to be planted on rehabilitation projects; seedling establishment is successful but this is expensive, time consuming and extremely limited in scale.…”

Section: Discussionmentioning

confidence: 99%

Post-fire seeding on Wyoming big sagebrush ecological sites: Regression analyses of seeded nonnative and native species densities

Eiswerth

Krauter

Swanson

et al. 2009

Journal of Environmental Management

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Section: Discussionmentioning

confidence: 99%

Post-fire seeding on Wyoming big sagebrush ecological sites: Regression analyses of seeded nonnative and native species densities

Eiswerth

Krauter

Swanson

et al. 2009

Journal of Environmental Management

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“…Current area affected is likely greater. This is especially problematic as large fires, which have been linked to extirpation of local populations of Sage-Grouse (Pedersen et al 2003), may be occurring more frequently. This is especially problematic as large fires, which have been linked to extirpation of local populations of Sage-Grouse (Pedersen et al 2003), may be occurring more frequently.…”

Section: Managing Fluctuating Sagebrush Landscapesmentioning

confidence: 99%

Historical fire regimes, reconstructed from land‐survey data, led to complexity and fluctuation in sagebrush landscapes

Bukowski

Baker

2013

Ecological Applications

105

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Sagebrush landscapes provide habitat for Sage-Grouse and other sagebrush obligates, yet historical fire regimes and the structure of historical sagebrush landscapes are poorly known, hampering ecological restoration and management. To remedy this, General Land Office Survey (GLO) survey notes were used to reconstruct over two million hectares of historical vegetation for four sagebrush-dominated (Artemisia spp.) study areas in the western United States. Reconstructed vegetation was analyzed for fire indicators used to identify historical fires and reconstruct historical fire regimes. Historical fire-size distributions were inverse-J shaped, and one fire > 100 000 ha was identified. Historical fire rotations were estimated at 171-342 years for Wyoming big sagebrush (A. tridentata ssp. wyomingensis) and 137-217 years for mountain big sagebrush (A. tridentata ssp. vaseyana). Historical fire and patch sizes were significantly larger in Wyoming big sagebrush than mountain big sagebrush, and historical fire rotations were significantly longer in Wyoming big sagebrush than mountain big sagebrush. Historical fire rotations in Wyoming were longer than those in other study areas. Fine-scale mosaics of burned and unburned area and larger unburned inclusions within fire perimeters were less common than in modern fires. Historical sagebrush landscapes were dominated by large, contiguous areas of sagebrush, though large grass-dominated areas and finer-scale mosaics of grass and sagebrush were also present in smaller amounts. Variation in sagebrush density was a common source of patchiness, and areas classified as "dense" made up 24.5% of total sagebrush area, compared to 16.3% for "scattered" sagebrush. Results suggest significant differences in historical and modern fire regimes. Modern fire rotations in Wyoming big sagebrush are shorter than historical fire rotations. Results also suggest that historical sagebrush landscapes would have fluctuated, because of infrequent episodes of large fires and long periods of recovery and maturity. Due to fragmentation of sagebrush landscapes, the large, contiguous expanses of sagebrush that dominated historically are most at risk and in need of conservation, including both dense and scattered sagebrush. Fire suppression in Wyoming big sagebrush may also be advisable, as modern fire rotations are shorter than their historical counterparts.

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“…The choice of the grazed horizon is correctly simulated under these different management scenarios, but grazing is not spatially explicit. Pedersen et al [39] used a discretetime, stochastic compartment model based on difference equations with a time interval of one week to simulate the effect of sheep grazing on vegetation and a resident bird population dynamics. The spatial aspect is limited to the consideration of 15 patches in different stages of vegetation development and onto which different grazing events were applied.…”

Section: Spatially Explicit Models Of Herbivore Foraging That Do Not mentioning

confidence: 99%

Spatially explicit models of group foraging by herbivores: what can Agent-Based Models offer?

Dumont

Hill

2004

Anim. Res.

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-Spatially explicit models of herbivore foraging can increase the knowledge of ethologists by enabling the prediction of the evolution of complex systems and revealing underlying behavioural mechanisms. We first show how spatially explicit models that do not distinguish between individuals imply making assumptions which violate some basic biological principles. Next, we describe how the main behavioural processes that determine herbivore foraging have already been incorporated in spatially explicit individual-based models of foraging. We then discuss how the use of agent technology promotes the inclusion of social oriented cognition in individual-based simulations, emphasising the emergence of macro-phenomena from the local interactions between individual organisms. This approach makes agent-based models particularly suited to simulate the behaviour of groups of foraging herbivores. We discuss how agent-based models can help to investigate conditions that are not easily amenable to experimentation, such as the effects of differences in memory capacity or in sociability, and how they are adapted to integrate the experimentally-demonstrated laws, processes and theoretical frameworks developed in herbivore foraging. agent-based model / grazing / individual-based model / social behaviour / spatial memory Résumé -L'apport des systèmes multi-agents à la modélisation du pâturage des herbivores. Les modèles spatialisés relatifs au pâturage des herbivores augmentent la connaissance des éthologues lorsqu'ils permettent de comprendre les mécanismes sous-jacents au fonctionnement des systèmes, et de prédire leur évolution. Nous commençons par montrer que les modèles spatialisés qui ne prennent pas en compte les caractéristiques individuelles des animaux vont à l'encontre de principes biologiques majeurs. Puis, nous décrivons comment les principaux mécanismes comportementaux qui déterminent le comportement des herbivores au pâturage ont déjà été pris en compte dans des modèles spatialisés individus-centrés. Ensuite, nous discutons que l'approche multi-agents s'adapte remarquablement bien à la représentation du comportement de groupes d'animaux, parce qu'elle permet de représenter les conséquences d'intéractions d'agents agissant en parallèle, de telle manière qu'elles influencent le comportement de l'ensemble du système. Nous montrons alors comment un modèle multi-agents peut permettre d'explorer des situations difficiles à tester expérimentalement, comme par exemple les conséquences de variations des capacités mémorielles des animaux ou de

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Effect of sheep grazing and fire on sage grouse populations in southeastern Idaho

Cited by 28 publications

References 34 publications

Post-fire seeding on Wyoming big sagebrush ecological sites: Regression analyses of seeded nonnative and native species densities

Post-fire seeding on Wyoming big sagebrush ecological sites: Regression analyses of seeded nonnative and native species densities

Historical fire regimes, reconstructed from land‐survey data, led to complexity and fluctuation in sagebrush landscapes

Spatially explicit models of group foraging by herbivores: what can Agent-Based Models offer?

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