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Keyword: nonnative species

Climate, demography, and zoogeography predict introgression thresholds in salmonid hybrid zones in Rocky Mountain streams

Publications Posted on: November 09, 2016
Among the many threats posed by invasions of nonnative species is introgressive hybridization, which can lead to the genomic extinction of native taxa. This phenomenon is regarded as common and perhaps inevitable among native cutthroat trout and introduced rainbow trout in western North America, despite that these taxa naturally co-occur in some locations.

Response of conifer-encroached shrublands in the Great Basin to prescribed fire and mechanical treatments

Publications Posted on: July 14, 2015
In response to the recent expansion of pinon and juniper woodlands into sagebrush-steppe communities in the northern Great Basin region, numerous conifer-removal projects have been implemented, primarily to release understory vegetation at sites having a wide range of environmental conditions. Responses to these treatments have varied from successful restoration of native plant communities to complete conversion to nonnative invasive species.

Barriers, invasion, and conservation of native salmonids in coldwater streams [Box 18.2]

Publications Posted on: March 30, 2011
Habitat loss and fragmentation are threats to persistence of many native fish populations. Invading nonnative species that may restrict or displace native species are also important. These two issues are particularly relevant for native salmonids that are often limited to remnant habitats in cold, headwater streams.

Invasion by non-native brook trout in Panther Creek, Idaho: Roles of habitat quality, biotic resistance, and connectivity to source habitats

Publications Posted on: August 31, 2009
Theoretical models and empirical evidence suggest that the invasion of nonnative species in freshwaters is facilitated through the interaction of three factors: habitat quality, biotic resistance, and connectivity. We measured variables that represented each factor to determine which were associated with the occurrence of nonnative brook trout Salvelinus fontinalis in Panther Creek, a tributary to the Salmon River, Idaho.

Chapter 16: Fire and nonnative plants-summary and conclusions

Publications Posted on: April 16, 2009
This volume synthesizes scientific information about interactions between fire and nonnative invasive plants in wildlands of the United States. If the subject were clear and simple, this volume would be short; obviously, it is not.

Chapter 15: Monitoring the effects of fire on nonnative invasive plant species

Publications Posted on: April 16, 2009
Monitoring, as defined by Elzinga and others (1998), is "the collection and analysis of repeated observations or measurements to evaluate changes in condition and progress towards meeting a management objective." Analyses of monitoring data may indicate that a project is meeting land management goals, or it may indicate that goals are not being met and management methods need to be adapted to reach them.

Chapter 14: Effects of fire suppression and postfire management activities on plant invasions

Publications Posted on: April 16, 2009
This chapter explains how various fire suppression and postfire management activities can increase or decrease the potential for plant invasions following fire. A conceptual model is used to summarize the basic processes associated with plant invasions and show how specific fire management activities can be designed to minimize the potential for invasion.

Chapter 13: Effects of fuel and vegetation management activities on nonnative invasive plants

Publications Posted on: April 16, 2009
Twentieth century land use and management practices have increased the vertical and horizontal continuity of fuels over expansive landscapes. Thus the likelihood of large, severe wildfires has increased, especially in forest types that previously experienced more frequent, less severe fire (Allen and others 2002).

Chapter 12: Gaps in scientific knowledge about fire and nonnative invasive plants

Publications Posted on: April 16, 2009
The potential for nonnative, invasive plants to alter an ecosystem depends on species traits, ecosystem characteristics, and the effects of disturbances, including fire. This study identifies gaps in science-based knowledge about the relationships between fire and nonnative invasive plants in the United States. The literature was searched for information on 60 nonnative invasives.

Chapter 11: Fire and nonnative invasive plants in the Hawaiian Islands bioregion

Publications Posted on: April 16, 2009
The Hawaiian Islands are national and global treasures of biological diversity. As the most isolated archipelago on earth, 90 percent of Hawaii's 10,000 native species are endemic (Gagne and Cuddihy 1999). The broad range of elevation and climate found in the Hawaiian Islands supports a range of ecosystems encompassing deserts, rain forests and alpine communities often within the span of less than 30 miles.

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