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FIGURE 9 in Integrative taxonomy reveals two new narrowly-endemic crayfish species (Decapoda: Cambaridae) from the Yadkin River Basin in western North Carolina, USA
FIGURE 9. Cambarus burchfielae, (left) second form male morphotype (NCSM 90221) in life, North Prong Lewis Fork, Wilkes County, NC; (right) female allotype (NCSM 90220) in life from the type locality, Fall Creek, Wilkes County, NC; (photo credit: Michael A. Perkins, NCWRC).
FIGURE 5 in Integrative taxonomy reveals two new narrowly-endemic crayfish species (Decapoda: Cambaridae) from the Yadkin River Basin in western North Carolina, USA
FIGURE 5. Cambarus lapidosus, (left) second form male morphotype (NCSM 90224) in life, Stony Fork, Wilkes County, NC; (right) female allotype (NCSM 90223) in life, Orchard Creek, Watauga County, NC (note: regenerated left chela with single row of mesial tubercles); (photo credit: Michael A. Perkins, NCWRC).
Supplementary material 3 from: Mohammed E, Amen R, Abdelwahab HM, Winkelmann C (2023) Potential impacts of invasive crayfish on native benthic fish: shelter use and agonistic behaviour. NeoBiota 83: 131-153. https://doi.org/10.3897/neobiota.83.102975
Correlation scatterplot of the crayfish frequency of aggressive movements, carapace length, chela length, body mass, bullhead standard length, and bullhead body mass
Supplementary material 2 from: Mohammed E, Amen R, Abdelwahab HM, Winkelmann C (2023) Potential impacts of invasive crayfish on native benthic fish: shelter use and agonistic behaviour. NeoBiota 83: 131-153. https://doi.org/10.3897/neobiota.83.102975
Scatterplot of the frequency of crayfish aggressive movements vs. carapace length, chela length, body mass, stone loach standard length, and stone loach body mass
Data for: Northern crayfish form alternation morphometrics
<p>Complex life histories are frequently associated with biological trade-offs, as the use of one trait can decrease the performance of a second trait due to the need to balance competing demands to maximize fitness. Here, we examine growth patterns in invasive adult male northern crayfish (<em>Faxonius virilis</em>) that are indicative of a potential trade-off between energy allocation for body size versus chelae size growth. Northern crayfish undergo cyclic dimorphism, a process characterized by seasonal morphological changes associated with reproductive status. We measured carapace length and chelae length before and after molting and compared these growth increments between the four morphological transitions of the northern crayfish. Consistent with our predictions, reproductive crayfish molting to the non-reproductive form and non-reproductive crayfish molting within the non-reproductive form experienced a larger carapace length growth increment. Reproductive crayfish molting within the reproductive form and non-reproductive crayfish molting to the reproductive form, on the other hand, experienced a larger growth increment in chelae length. The results of this study support that cyclic dimorphism evolved as a strategy for optimizing energy allocation for body and chelae size growth during discrete periods of reproduction in crayfish with complex life histories.</p>
FIGURE 3 in Cherax woworae, a new freshwater crayfish (Decapoda: Parastacidae) from Southwest Papua Province, Indonesia
FIGURE 3. The Bird's Head Peninsula, Indonesia, and the locality of Cherax woworae n. sp. in Southwest Papua Province indicated by the red dot.
FIGURE 2. Cherax woworae n in Cherax woworae, a new freshwater crayfish (Decapoda: Parastacidae) from Southwest Papua Province, Indonesia
FIGURE 2. Cherax woworae n. sp., a–g, holotype ♁, PCL 29 mm, MZB Cru 5644; h–i, allotype ♀, PCL 31 mm, MZB Cru 5645: a, lateral view of carapace; b, dorsal view of carapace; c, dorsal view of left chela; d, ventral view of left chela; e, dorsal view of left scaphocerite; f, epistome and coxopodite of antennal peduncles; g, outer lateral margin of right male chela; h, outer lateral margin of right female chela; i, sternal keel. Scale bars = 1 cm.
FIGURE 1. Cherax woworae n in Cherax woworae, a new freshwater crayfish (Decapoda: Parastacidae) from Southwest Papua Province, Indonesia
FIGURE 1. Cherax woworae n. sp., holotype ♁, PCL 29 mm, MZB Cru 5644: a, colour in life; b, colour in preservative.
FIGURE 4 in Cherax woworae, a new freshwater crayfish (Decapoda: Parastacidae) from Southwest Papua Province, Indonesia
FIGURE 4. Bayesian analysis consensus phylogram of selected Cherax based on combined COI and 16S dataset. Posterior probabilities and ML bootstrap values are displayed next to each node. An asterisk indicates nodes with full support (1/100) in both analyses. The scale bar indicates the substitution rate.
Figure 9 in Natural history and ecology of the slender crayfish (Faxonius compressus): an ecosystem engineer in the Western Highland Rim, USA
Figure 9. The mean carapace length of Faxonius compressus collected across 33 sites, based on the macrohabitat type and the water depth at which they were collected. Boxes indicate the treatments̍ interquartile range, and points represent our raw data.
Figure 6 in Natural history and ecology of the slender crayfish (Faxonius compressus): an ecosystem engineer in the Western Highland Rim, USA
Figure 6. The density of burrows counted within a 0.25 m2 quadrat based on three separate macrohabitat types across 33 different sites. Boxes indicate the treatments̍ interquartile range, and points represent our raw data.
Figure 5 in Natural history and ecology of the slender crayfish (Faxonius compressus): an ecosystem engineer in the Western Highland Rim, USA
Figure 5. Fish species that we documented utilising crayfish burrows. Note that not all photographs depict the fish utilising crayfish burrows. (A) Fantail darter, Etheostoma flabellare. (B) Rainbow darter, Etheostoma caeruleum. (C) Saffron darter, Etheostoma flavum. (D) Redline darter, Etheostoma rifilineatum. (E) Gaurdian darter, Etheostoma oophylax. (F) Banded sculpin, Cottus carolinae.
Figure 1 in Natural history and ecology of the slender crayfish (Faxonius compressus): an ecosystem engineer in the Western Highland Rim, USA
Figure 1. (A) Adult male slender crayfish, Faxonius compressus. (B) Morphology of F. compressus claw.
Figure 4 in Natural history and ecology of the slender crayfish (Faxonius compressus): an ecosystem engineer in the Western Highland Rim, USA
Figure 4. Co-occurring crayfish species encountered alongside Faxonius compressus within our study area. (A) The hillbilly hairy crayfish, Cambarus polypilosus. (B) Saddleback crayfish, Faxonius durrelli. (C) A juvenile F. durrelli using a hyporheic burrow. (D) An adult big claw crayfish, Faxonius placidus, using a hyporheic burrow.
Figure 2 in Natural history and ecology of the slender crayfish (Faxonius compressus): an ecosystem engineer in the Western Highland Rim, USA
Figure 2. (A) Typical view of Faxonius compressus habitat with an abundance of chert gravel and cobble. Large boulders are rare or entirely absent. (B) Benthic view of typical F. compressus habitat, with ample interstitial space allowing for the excavation of interstitial burrows. (C,D) Examples of F. compressus hyporheic burrows within the chert substrate on the stream benthos.
Figure 8 in Natural history and ecology of the slender crayfish (Faxonius compressus): an ecosystem engineer in the Western Highland Rim, USA
Figure 8. The number of Faxonius compressus collected across 33 sites based on the macrohabitat type and the water depth at which they were collected. Boxes indicate the treatments̍ interquartile range, and points represent our raw data.
Figure 7 in Natural history and ecology of the slender crayfish (Faxonius compressus): an ecosystem engineer in the Western Highland Rim, USA
Figure 7. The relationship between estimated water depth and the density of burrows counted within a 0.25 m2 quadrat. Black circles represent our raw data, and the dashed line presents the linear relationship between water depth and burrow density.
Data from: Environmental DNA surveillance for invertebrate species: advantages and technical limitations to detect invasive crayfish Procambarus clarkii in freshwater ponds
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Data for: Northern crayfish form alternation morphometrics
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Data from: Environmental DNA (eDNA) detects the invasive rusty crayfish (Orconectes rusticus) at low abundances
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