Grazing for Weed Control and Wildlife Management Morgan Doran Livestock & Natural Resources Advisor University of California Cooperative Extension.

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Presentation transcript:

Grazing for Weed Control and Wildlife Management Morgan Doran Livestock & Natural Resources Advisor University of California Cooperative Extension

To Graze Or Not To Graze? Many years of debate, polarized views and management decisions based on dogma. Both sides want the same outcome from their management philosophy. Healthy ecosystem Sustainable provision of ecosystem services

Grazing References Marty, J Effects of cattle grazing on diversity in ephemeral wetlands. Conservation Biology 19: – Removal of grazing decreased native vegetation and invertebrate species in vernal pools. Pyke, C.R. and J. Marty Cattle grazing mediates climate change impacts on ephemeral wetlands. Conservation Biology 19: – Grazing can confound hydrologic changes driven by climate change and play a critical role in maintaining the hydrologic suitability of vernal pools for endangered aquatic invertebrates and amphibians. Germano, D.J., G.B. Rathbun, and L.R. Saslaw Managing exotic grasses and conserving declining species. Wildlife Society Bulletin 29(2): – Although livestock may have contributed originally to habitat destruction and introduction of exotic plants, we believe that in some years, moderate to heavy grazing by livestock is the best way to decrease the dense cover created by exotics. Russell W. H., and J.R. McBride Landscape scale vegetation-type conversion and fire hazard in the San Francisco bay area open spaces. Landscape and Urban Planning. 64: – Successional pressures resulting from fire suppression and reduced grazing have resulted in vegetation-type conversion in the open spaces surrounding the urbanized areas of the San Francisco bay area. Hayes, G.F. and K.D. Holl Cattle grazing impacts on annual forbs and vegetation composition of Mesic Grasslands in California. Conservation Biology. 17(6): – The results of this and other studies highlight the importance of considering the adaptation of vegetation communities to disturbance in making grazing management recommendations. DiDonato, J Endangered Amphibian Research within Grazed Grasslands. Symposium presentation: Grazing for Biological Conservation. San Jose, CA. – Amphibians evolved with disturbances associated with large herbivores and such animals continue to play an important role in these ecosystems.

Grazing? “Grazing” and “No Grazing” Grazing parameters are used to describe and define the type of grazing Targets based on objectives

Feeding Behavior Lunch Buffet

Targeted Grazing Grazing Parameters – Type of Animal – Timing of Grazing – Livestock Density – Grazing Duration Manipulated to achieve desired results.

Taeniatherum caput-medusae - medusahead

Low palatability Persistent thatch Decrease diversity

Fall germination Late-Spring Medusahead Desirable annual species Phenology of Medusahead relative to desirable annual species.

Early-summer Phenology of Medusahead relative to desirable annual species. Desirable annual species Medusahead Fall germination Late-Spring

Phenology of Medusahead relative to desirable annual species. Desirable annual species Medusahead Fall germination Late-SpringEarly-summer Control Livestock?

Medusahead Growth

Mh grazing trial

DiTomaso et al., Invasive Plant Science and Management 1:

# of Sheep (ewes)# of Cattle (cows)Area (acres)Time (days) # of Sheep (ewes)# of Cattle (cows)Area (acres)Time (days) # of Sheep (ewes)# of Cattle (cows)Area (acres)Time (days) Stocking rate (AUD/acre) Adjusting stocking density and duration with a static stocking rate.

Applying Targeted Grazing Timing Weather Acreage Livestock (number, class) Amount of forage Infrastructure Logistics Integrated with other options

Conclusions Conversion of CA rangelands Grazing can provide ecological benefits – Weed control, wildlife habitat, fire fuel reduction Weed control depends on precise timing based on plant phenology. Effective control requires long term planning and incorporation of treatments into the regular management Also requires a shift from traditional grazing practices (time, density, duration) We must accurately and precisely define grazing parameters to replicate successes and avoid problems

Questions Morgan Doran