Conservation Status of Crayfishes of the United States and Canada

Taylor, Christopher A.; Warren, Melvin L.; Fitzpatrick, James; Hobbs, Horton H.; Jezerinac, Raymond F.; Pflieger, William L.; Robison, Henry W.

doi:10.1577/1548-8446(1996)021<0025:csocot>2.0.co;2

Cited by 209 publications

(141 citation statements)

References 23 publications

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“…8. Historic range size in the USA (number of states in which species occurred) for native unionid mussels species [(a) data from Williams et al 1993] and crayfish species [(b) data from Taylor et al 1996] in different conservation categories. In a few cases, particularly for crayfishes (C. A. Taylor pers.…”

Section: Conclusion and Recommendationsmentioning

confidence: 99%

Predicting impact of freshwater exotic species on native biodiversity: Challenges in spatial scaling

Lodge

Stein

Brown

et al. 1998

Australian Journal of Ecology

266

166

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Global homogenization of biota is underway through worldwide introduction and establishment of nonindigenous (exotic) species. Freshwater ecologists should devote more attention to exotic species for two reasons. First, exotics provide an opportunity to test hypotheses about what characteristics of species or habitats are related to successful establishment or invasibility, respectively. Second, predicting which species will cause large ecological change is an important challenge for natural resource managers. Rigorous statistical relationships linking species characteristics to probability of establishment or of causing ecological impacts are needed. In addition, it is important to know how reliable different sorts of experiments are in guiding predictions. We address this issue with different spatial scales of experiments testing the impact of two predators on native snail assemblages in northern Wisconsin USA lakes: an exotic crayfish, the rusty crayfish (Orconectes rusticus); and a native fish predator, the pumpkinseed sunfish (Lepomis gibossus). For the crayfish, laboratory experiments, a field cage experiment, and a snapshot survey of 21 lakes gave consistent results: the crayfish reduced abundance and species richness of native snails. Laboratory and field experiments suggested that pumpkinseed sunfish should have a similar impact, but the lake survey suggested little impact. Unfortunately, no algorithms exist to guide scaling up from small‐scale experiments to the whole‐lake, long‐term management scale. To protect native biodiversity, management of freshwater exotic species should be targeted on lakes or drainages that are both vulnerable to colonization by an exotic, and that harbour endemic species. Management should focus on preventing introduction because eradication after establishment is usually not possible.

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Section: Conclusion and Recommendationsmentioning

confidence: 99%

Predicting impact of freshwater exotic species on native biodiversity: Challenges in spatial scaling

Lodge

Stein

Brown

et al. 1998

Australian Journal of Ecology

266

166

View full text Add to dashboard Cite

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“…Ten percent of all the freshwater fish species, 30% of all the freshwater mussels, and 61% of all the freshwater crayfish that have been described worldwide occur in the United States (Page and Burr 1991, Williams et al 1993, Warren and Burr 1994, Taylor et al 1996, Master et al 1998. Even more impressive statistics have been reported for other freshwater taxa (e.g., stoneflies, dragonflies, mayflies; Master et al 1998).…”

Section: Introductionmentioning

confidence: 99%

A Gap Analysis and Comprehensive Conservation Strategy for Riverine Ecosystems of Missouri

Sowa

Annis

Morey

et al. 2007

Ecological Monographs

139

128

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Abstract. North America harbors an astounding proportion of the world's freshwater species, but it is facing a freshwater biodiversity crisis. A first step to slowing the loss of biodiversity involves identifying gaps in existing efforts to conserve biodiversity and prioritizing opportunities to fill these gaps. In this monograph we detail two separate, but complementary, conservation planning efforts-a Gap Analysis (GAP) and a State Wildlife Action Plan (WAP)-for Missouri that address this first step. The goal of the Missouri Aquatic GAP Project was to identify riverine ecosystems, habitats, and species not adequately represented (i.e., gaps) within existing conservation lands. The goal of the freshwater component of the Missouri Wildlife Action Plan was to identify and map a set of conservation-opportunity areas (COAs) that holistically represent all riverine ecosystems, habitats, and species in Missouri. Since conservation planning is a geographical exercise, both efforts utilized geographic information systems (GIS). Four principal GIS data sets were used in each planning effort: (1) a hierarchical riverine ecosystem classification, (2) predicted species distributions, (3) public ownership/stewardship, and (4) a human-threat index. Results of the gap analyses are not encouraging. Forty five, mostly rare, threatened, or endangered, species are not represented in lands set aside for conserving biodiversity. Results also illustrate the fragmented nature of conservation lands, which are mainly situated in the uplands and fail to provide connectivity among riverine habitats. Furthermore, many conservation lands are severely threatened by an array of human disturbances. In contrast, results of the WAP provide hope that relatively intact riverine ecosystems still exist. A total of 158 COAs, representing ;6% of the total kilometers of stream in Missouri, were selected for the WAP. This illustrates that a wide spectrum of biodiversity can be represented within a small portion of the total resource base, but the area of conservation concern is often much larger. Identifying priority riverscapes for conservation is an important first step toward effective biodiversity conservation. Yet, achieving the ultimate goal of conserving biodiversity will require vigilance on the part of all responsible parties, with particular attention to addressing and coordinating the many remaining logistical tasks.

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“…While all 640+ species of freshwater crayfish have yet to be categorized for conservation status relative to the IUCN Red List Criteria (IUCN 2001), a large number of species already occur on that list. Taylor et al (1996) found that over 50% of the United States species of freshwater crayfish are endangered or threatened to some degree. Yet, surprising, very few of these species are under national protection with a few more under local (state, provincial) protection.…”

Section: Human Related Issuesmentioning

confidence: 99%