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Habitat associations and distributions of two endemic crayfishes, Cambarus (Erebicambarus) maculatus Hobbs & Pflieger, 1988 and Faxonius (Billecambarus) harrisonii (Faxon, 1884) (Decapoda: Astacoidea: Cambaridae), in the Meramec River drainage, Missouri, USA
Journal of Crustacean Biology ( IF 1.2 ) Pub Date : 2020-06-20 , DOI: 10.1093/jcbiol/ruaa033
Joe Chilton 1 , Amanda E Rosenberger 2 , Robert J DiStefano 3
Affiliation  

Understanding the habitat associations and distributions of rare species is important to inform management and policy decisions. Cambarus (Erebicambarus) maculatus Hobbs & Pflieger, 1988, the freckled crayfish, and Faxonius (Billecambarus) harrisonii (Faxon, 1884), the belted crayfish, are two of Missouri’s endemic crayfish species. Both species are listed as Vulnerable (S3) on Missouri’s Species and Communities of Conservation Concern Checklist due to their limited range within the Meramec River drainage (MRD) and the impact of anthropogenic activities therein. Their distributional overlap offers an opportunity for multi-species research to address gaps in information required for conservation. We sampled 140 sites throughout the MRD during the summers of 2017 and 2018 for crayfishes and associated habitat variables, which we related to crayfish presence in an occupancy modeling framework. We found that C. maculatus occupancy was associated with larger stream size, boulder substrate, dolomite lithology, aquatic vegetation beds, dissolved oxygen, and pool mesohabitat. Faxonius harrisonii occupancy increased with boulder substrate, aquatic vegetation beds, the presence of C. maculatus, and decreased in third-order streams. We also expanded the known range for both species within the MRD. Range estimates (watershed area) for C. maculatus and F. harrisonii were 4,347 km2 and 3,690 km2, respectively. This study demonstrates the importance of targeted rather than opportunistic sampling for species distribution.

中文翻译:

两种地方性小龙虾的栖息地关联和分布,Cambarus (Erebicambarus) maculatus Hobbs & Pflieger,1988 年和 Faxonius (Billecambarus) harrisonii (Faxon,1884)(十足目:Astacoidea:Cambaridae),位于美国密萨米克河的河流

了解稀有物种的栖息地关联和分布对于为管理和政策决策提供信息非常重要。Cambarus (Erebicambarus) maculatus Hobbs & Pflieger, 1988,雀斑小龙虾和 Faxonius (Billecambarus) harrisonii (Faxon, 1884),带状小龙虾,是密苏里州特有的两种小龙虾。由于它们在 Meramec 河流域 (MRD) 内的范围有限以及其中人为活动的影响,这两个物种在密苏里州的物种和社区保护问题清单中被列为易危 (S3)。它们的分布重叠为多物种研究提供了解决保护所需信息差距的机会。我们在 2017 年和 2018 年夏季在整个 MRD 的 140 个地点采样了小龙虾和相关的栖息地变量,我们将其与占用建模框架中的小龙虾存在联系起来。我们发现 C. maculatus 的占有率与较大的河流大小、巨石基质、白云岩岩性、水生植被床、溶解氧和水池中生境有关。Faxonius harrisonii 的占有率随着巨石基质、水生植被床、C. maculatus 的存在而增加,而在三阶溪流中则减少。我们还扩大了 MRD 内这两个物种的已知范围。C. maculatus 和 F. harrisonii 的估计范围(流域面积)分别为 4,347 平方公里和 3,690 平方公里。这项研究证明了有针对性的而不是随机抽样对物种分布的重要性。白云岩岩性、水生植被床、溶解氧和水池中生境。Faxonius harrisonii 的占有率随着巨石基质、水生植被床、C. maculatus 的存在而增加,而在三阶溪流中则减少。我们还扩大了 MRD 内这两个物种的已知范围。C. maculatus 和 F. harrisonii 的估计范围(流域面积)分别为 4,347 平方公里和 3,690 平方公里。这项研究证明了有针对性的而不是随机抽样对物种分布的重要性。白云岩岩性、水生植被床、溶解氧和水池中生境。Faxonius harrisonii 的占有率随着巨石基质、水生植被床、C. maculatus 的存在而增加,而在三阶溪流中则减少。我们还扩大了 MRD 内这两个物种的已知范围。C. maculatus 和 F. harrisonii 的估计范围(流域面积)分别为 4,347 平方公里和 3,690 平方公里。这项研究证明了有针对性的而不是随机抽样对物种分布的重要性。C. maculatus 和 F. harrisonii 的估计范围(流域面积)分别为 4,347 平方公里和 3,690 平方公里。这项研究证明了有针对性的而不是随机抽样对物种分布的重要性。C. maculatus 和 F. harrisonii 的估计范围(流域面积)分别为 4,347 平方公里和 3,690 平方公里。这项研究证明了有针对性的而不是随机抽样对物种分布的重要性。
更新日期:2020-06-20
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