This report summarizes recommendations from a group of independent science advisors for the Yolo County Natural Community Conservation Plan/Habitat Conservation Plan (NCCP/HCP). This scientific input is provided early in the planning process, before preparation of a draft plan, to help ensure that the plan is developed using best available science. To ensure objectivity, the advisors operate independent of the Yolo County Habitat/Natural Community Conservation Plan Joint Powers Agency (JPA), its consultants, or any other entities involved in the NCCP/HCP. Our recommendations are advisory only and are not binding on NCCP/HCP participants.
In some cases our advice may extend beyond what was expected by the JPA, relative to the current scope of the NCCP/HCP. For example, although the JPA is not seeking permit coverage for aquatic species or flood-control projects through the plan, we offer recommendations concerning these issues (1) in case the plan is ever expanded to address them, (2) because even development projects in terrestrial habitats can affect aquatic species, and (3) because the plan has potential to contribute to the recovery of aquatic resources in coordination with other planning or regulatory mechanisms. For example, throughout this document we offer suggestions for where the NCCP/HCP may complement the goals of such other planning efforts as the County’s Integrated Regional Water Management Plan.
Our recommendations are organized by the following major topics: (1) the scope of the plan, (2) review of existing information, (3) conservation design approaches, (4) conservation analyses, and (5) adaptive management and monitoring.
This report summarizes recommendations from a group of independent science advisors for the Yuba and Sutter County Natural Community Conservation Plan/Habitat Conservation Plan (NCCP/HCP). This statutorily required scientific input is provided early in the planning process, before preparation of a draft plan, to help ensure that the plan is developed using best available science. Attachment A provides brief biographies of the independent science advisors. To ensure objectivity, the advisors operate independent of the two counties, their consultants, the wildlife agencies, or any other entities involved in the NCCP/HCP.
This report assesses potential impacts of feral pig populations in southern California (San Diego, Riverside, Imperial, and Orange counties) and Baja California, with an emphasis on San Diego County. We compiled information on the status of pigs in these areas from the literature and interviews with numerous individuals knowledgeable about feral pig populations, including a population recently introduced into San Diego County. We also reviewed available information on the potential impacts of feral pigs on natural resources, water systems, agriculture, and human health, and discussed the feasibility of various control and eradication options.
We developed population and habitat suitability models for feral pigs in San Diego County to examine the potential for numeric and geographic expansion following the recent introduction near El Capitan Reservoir. The models suggest that the population has the potential to grow rapidly and expand into large expanses of currently un-occupied habitat. Such expansion could harm natural biological resources, including riparian and oak woodland communities and numerous sensitive species. It is possible that populations could establish in such protected lands as Cuyamaca Rancho State Park and Volcan Mountain Preserve, as well as various wilderness areas. This could greatly diminish and possibly nullify large conservation investments already made in this region, including habitat restoration efforts. Finally, an expanding feral pig population in San Diego County could invade and cause grave damage in Baja California, where feral pig populations have not, to date, been reported.
This report evaluates the impact that administrative and ecological constraints might have on the amount of forest biomass that could be extracted for energy use in the Southeastern U.S. Using available spatial datasets, we quantified and mapped how the application of various “conservation value screens” would change previous estimates of available standing forest biomass (Blackard et al. 2008). These value screens included protected areas managed for conservation values, USDA Forest Service and Bureau of Land Management (BLM) lands, steep slopes, designated critical habitat for federally-listed threatened and endangered species, inventoried roadless areas, old-growth forests, wetlands, hydrographic (lake, stream, and coastline) buffers, and locations of threatened and endangered species (G1-G3, S1-S3).
Two alternative combinations of values were examined: in Alternative 1, all areas within value screens, including all Forest Service and BLM lands, were excluded from biomass development. In Alternative 2, Forest Service and BLM lands not afforded extra protection by such designations as wilderness or research natural areas were assumed available for biomass extraction; all other values continued to be excluded from extraction. In both alternatives, biomass located within the Wildland-Urban Interface (WUI) was assumed available for extraction regardless of conservation value screens.
The analysis was conducted at 100-m x 100-m resolution. Summary statistics were derived at three scales – entire study area, 13 states, and 24 World Wildlife Fund (WWF) ecoregions. Results were also summarized and mapped for all 1,342 counties.
Finally, we compared hydrologic datasets at two different scales (1:24,000 and 1:100,000) at multiple sample areas in the study area to evaluate how hydrologic scale might affect the delineation of riparian reserves and resulting estimates of biomass availability.
According to the California Department of Forestry and Fire Protection’s Fire and Resource Assessment Program (CDF FRAP 2005) there are over 340 million bone dry tons (BDT) of nonmerchantable, technical (potentially available) forest biomass, and slightly over 62 million BDT of shrubland biomass, that could be used for energy production in California. However, these CDF estimates did not account for a variety of administrative and ecological constraints that may limit where or how much biomass can actually be removed, due for example to concerns about impacts to ecologically sensitive lands or areas of high conservation value. We therefore evaluated to what degree additional ecological and administrative constraints might reduce the CDF estimates of technical forest and shrubland biomass for energy production. This coarse evaluation is meant more to illustrate the nature and extent of the constraints these issues may present to biomass use, rather than provide a comprehensive and precise quantification of the issues.
The Sonoran Desert of southern California has long been a region of under-appreciated natural significance. For most, the term “desert” evokes images of a bleak and lifeless wasteland—a place of unforgiving heat, sun, sand, and rocks. Throughout history, the Southwest’s deserts have been avoided or they presented a challenging obstacle on the way to a greener place. In the 19th century, during the era of exploration and migration, the desert was seen as an area to be crossed as quickly as possible. Even today, the Sonoran Desert remains one of the least populated areas in California. Historically and recently, many who ventured into the desert did so for utilitarian purposes—for activities such as mining, military training, farming, off-highway vehicle (OHV) recreation and, more recently, for energy production. In general, however, there has been a lack of awareness of the special and uniquely diverse species and ecosystems found in the region, leading to an unfortunate under-appreciation for what is truly an area of incredible
natural significance.
The foothills of the iconic Sierra Nevada—the California gold fields—are linked to California’s way of life and sense of place, as well as tied to the history of our nation. To many Californians, the natural resources of the Sierran foothills are emblematic of our state—grasslands golden in the summer sun mingling with rolling oak woodlands. Nonetheless, this iconic California landscape is not well protected, but rather is severely threatened by residential sprawl that has the potential to permanently compromise its conservation values. Less than 10% of the oak woodlands and grasslands in the Sierra Nevada foothills are protected, and the value of these conservation investments relies on maintaining the lands’ integrity and ecosystem functions by buffering them from development and maintaining connections to other intact areas. The current downturn in the real estate market provides a window of opportunity to protect some of the last uncompromised areas of the northern Sierra foothills using conservation tools such as fee title acquisitions, conservation easements, and land management agreements.
The California Department of Transportation (Caltrans) and California Department of Fish and Game (CDFG) commissioned the California Essential Habitat Connectivity Project because a functional network of connected wildlands is essential to the continued support of California’s diverse natural communities in the face of human development and climate change. This Report is also intended to make transportation and land-use planning more efficient and less costly, while helping reduce dangerous wildlife-vehicle collisions.
This Report was produced by a highly collaborative, transparent, and repeatable process that can be emulated by other states. The work was guided by input and review of a Multidisciplinary Team of agency representatives, a Technical Advisory Group, and a Steering Committee. The Multidisciplinary Team (~200 people from 62 agencies) provided broad representation across Federal, State, Tribal, regional, and local agencies that are involved in biodiversity conservation, land-use planning, or land management—and that could therefore both contribute to and benefit from efforts to improve habitat connectivity at various scales. The Technical Advisory Group (44 people from 23 agencies) was a subset of the Multidisciplinary Team. It provided technical expertise to help guide such decisions as selection of data sources, models, and mapping criteria. The Steering Committee (ten people from four partner agencies) guided key decisions about work flow, meeting agendas, and document contents. In addition to review by these agency representatives, the work plan and this final report were subject to peer review by five outside experts in conservation biology and conservation planning.
This report assess (1) the current status of fisher habitat and fishers (Martes pennanti) in the southern Sierra Nevada, California, and (2) how fisher habitat and the fisher population may respond in the future to potential forest management practices and wildfires. The ultimate goals are to hlep the three southern Sierra Forests (Sierra, Sequoia, and Stanislaus) improve landscape-level fuels management plans intended to reduce the risk of unplanned and unwanted wildland fire to human and natural communities, to restore and maintain fire-adapted ecosystems, and to conserve habitat for at-risk species.
The fisher is one at risk species whose habitat and population in the Sierra Nevada may be threatened by unnaturally large and severe wildfires; however, they may also be harmed by management efforts intended to reduce wildfire threats. This report assesses these competing threat and applies the results to recommending approaches for maximizing Fireshed Assessment goals, including to conserve and enhance habitat value for fishers to ensure their continued persistence, and perhaps expansion, in the Sierra Nevada.
Altruism presents a challenge to evolutionary theory because selection should favor selfish over caring strategies. Greenbeard altruism resolves this paradox by allowing cooperators to identify individuals carrying similar alleles producing a form of genic selection. In side-blotched lizards, genetically similar but unrelated blue male morphs settle on adjacent territories and cooperate. Here we show that payoffs of cooperation depend on asymmetric costs of orange neighbors. One blue male experiences low fitness and buffers his unrelated partner from aggressive orange males despite the potential benefits of defection. We show that recognition behavior is highly heritable in nature, and we map genetic factors underlying color and self-recognition behavior of genetic similarity in both sexes. Recognition and cooperation arise from genomewide factors based on our mapping study of the location of genes responsible for self-recognition behavior, recognition of blue color, and the color locus. Our results provide an example of greenbeard interactions in a vertebrate that are typified by cycles of greenbeard mutualism interspersed with phases of transient true altruism. Such cycles provide a mechanism encouraging the origin and stability of true altruism.