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38 results for “Faxonius”
Boldness and Congener Impact on the Behavior of Faxonius rusticus and Faxonius virilis
Competition is an important ecological interaction that drives a number of processes from evolution to behavioral and physiological mechanisms. Competition between congeners is often intense given the significant overlap of niche structures for the two species. An interesting aspect of competition that is understudied is the mechanisms by which organisms know that they are in competition with another species. Thus, the sensory cues or signals that are being detected by competitors is the initial mechanism for changes in behavior or physiology. Crayfish are the most invasive aquatic species and often replace existing crayfish species through superior competition. This study was designed to investigate how chemical cues my be used by overlapping species of crayfish to determine the degree and intensity of competition and how that recognition changes resource use. These studies were performed in flow through mesocosms at the University of Michigan Biological Station. The results indicate that internal factors (size and personality) play a role in determining resource use for some resources, whereas external (chemical cues) and internal (personality) play a role in determining resource use for other resources.
The effects the mode of delivery of microcystin-LR has on rusty crayfish (Faxonius rusticus) behavior and physiology
Microcystin is a deadly toxin produced during algal blooms. The cells release MCLR which can cause significant neurological and behavioral damage to organisms exposed to the toxin. MCLR can exist in the water column and in the sediment and through normal ecological processes move between those two states or location. Given the location of the toxin, it is possible that MCLR in the sediment could have different adverse effects on organisms as opposed to when the toxin is in the water column. We tested that idea using crayfish that were exposed to either nothing, a vehicle to carry the mclr, and mclr. In addition, the toxin and vehicle were dosed either in the water column or in the sediment. Behavioral and physiological measures were taken after 4 days of exposure, The results indicate that at both the behavioral and physiological level, the location of the toxin has different adverse effects.
The impact of the presence of the crayfish Faxonius virilis on the excavating behavior of Faxonius propinquus, Michigan, 2025
Faxonius propinquus are native crayfish to the Upper Midwest. They are burrowing crayfish that work the sediment and make small burrows with numerous openings. These crayfish are imperiled by Faxonius virilis which overlap in niche structure. We were interested in the impact of the chemical cues emanating from F. virilis on the sediment and burrowing nature of F. propinquus. We conducted a study at the University of Michigan's Biological Station using F. propinquus caught in nearby Douglas Lake. In addition, we collected marl substrate from where these animals are found. We created flow through mesocosms and placed F. propinquus in the mesocosm with marl substrate. Then upstream of this, we placed a F. virilis in a flow through container to allow chemical cues from F. virilis to reach F. propinquus. We did a 48 hour study where 24 hours were with a competitor chemical cue and 24 were without. This 48 cycle was repeated to provide discrete 48 hour replicates. We monitored sediment working behavior at night and during the day.
REU data set from summer of 2022. Project was designed to understand how crayfish (Faxonius rusticus) respond to chemical cues from largemouth bass predators under different shelter distributions.
Research into predator–prey interactions has focused on the landscape of fear and nonconsumptive effects that result from prey responses. Prey behavior is influenced by predator presence and the location and quality of foraging resources in habitats. These areas have been fruitful, but the role of prey refuges has lagged. We investigated how refuge spatial distribution and quality influence prey behavior. To determine the role of the landscape of safety (LOS) in prey decision-making, we altered spatial relationships between refuges, refuge quality, and predation threats in mesocosms. Mesocosms were constructed such that prey only received predatory chemical cues. We employed a behavioral assay including largemouth bass (Micropterus salmoides (Lacepède, 1802): predator) and virile crayfish (Faxonius rusticus (Girard, 1852): prey). Crayfish shelter use was significantly influenced by quality and spatial relationship of shelters to predatory threats, and the interaction of these two factors. Particularly, crayfish used high-quality shelters more often when located closer to predatory cues than farther away and did not use low-quality shelters more than controls. High-quality shelter usage decreased as threat level (measured by gape ratio) decreased. These results support the idea that prey utilize an LOS, and information contained in these two landscapes may alter behavioral decisions.
Linked collectors and determiners for: Two new species of freshwater crayfish of the genus Faxonius (Decapoda: Cambaridae) from the Ozark Highlands of Arkansas and Missouri.
Natural history specimen data linked to collectors and determiners held within, "Two new species of freshwater crayfish of the genus Faxonius (Decapoda: Cambaridae) from the Ozark Highlands of Arkansas and Missouri". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/6c711c6e-5983-41a5-9ba0-133ac3e85f4a">https://bionomia.net/dataset/6c711c6e-5983-41a5-9ba0-133ac3e85f4a</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/6c711c6e-5983-41a5-9ba0-133ac3e85f4a">https://gbif.org/dataset/6c711c6e-5983-41a5-9ba0-133ac3e85f4a</a>. Formatted as a Frictionless Data package.
Are you anxious yet? Investigating the effects of citalopram on the physiology and behavior of the rusty crayfish (Faxonius rusticus)
Selective serotonin reuptake inhibitors (SSRI) are a growing group of pollutants that are increasingly causing detrimental changes to aquatic ecosystems. Upon entering aquatic habitats, these chemicals affect both vertebrates and invertebrates by influencing fecundity, aggression, exploration, and mortality in non-target organisms. In crustaceans, more specifically in crayfish and lobsters, since serotonin (5-Hydroxytryptamine, 5-HT) has been linked to a suite of stress responses and agonistic behaviors, SSRIs have the potential to harm these organisms significantly. In this study, we aimed to quantify the effects of a twenty-one day exposure of citalopram on the behavior and physiology of the rusty crayfish (Faxonius rusticus). Crayfish were exposed to an environmentally relevant concentration (1 μg / L) of citalopram in their tank water for 21 days and perform physiological (oxygen consumption and stress analysis) and behavioral (flight initiation distance) assays. Changes in behavior (reaction distance), physiology (oxygen consumption), and neurotransmitter levels (stress) were used to quantify any effects due to citalopram exposure. We found that as the length of exposure increased, regardless of citalopram presence, the oxygen consumption rate decreased significantly. Females that were injected with supplemental 5-HT froze closer to a novel stimulus than males or individuals from other treatment groups. Females also took longer to explore the arena than males, regardless of treatment. The amount of 5-HT present in individuals increased with mass, but this was not observed in individuals exposed to an external stressor regardless of the presence or absence of citalopram in their system. Exposure to 1 μg / L of citalopram for 21 days did not significantly impact crayfish behavior, but behavior and oxygen consumption were impacted by sex and isolation length, respectively. While this concentration of citalopram did not alter behavior or physiology, further work is
Supplementary material 3 from: Satmari A, Miok K, Ion MC, Zaharia C, Schrimpf A, Pârvulescu L (2023) Headwater refuges: Flow protects Austropotamobius crayfish from Faxonius limosus invasion. NeoBiota 89: 71-94. https://doi.org/10.3897/neobiota.89.110085
Overview of the results from the eDNA analysis for the detection of A. bihariensis/A. torrentium, F. limosus and A. astaci
Supplementary material 2 from: Satmari A, Miok K, Ion MC, Zaharia C, Schrimpf A, Pârvulescu L (2023) Headwater refuges: Flow protects Austropotamobius crayfish from Faxonius limosus invasion. NeoBiota 89: 71-94. https://doi.org/10.3897/neobiota.89.110085
Results of two samples Welch t-tests for comparisons between species with respect to the geospatial variables in occurrence sites
FIGURE 8. Faxonius elix n in Description of a new species of crayfish in the genus Faxonius (Decapoda: Cambaridae) from the Lower Ohio River Drainage, with evidence of glacial influence on the distribution of some crayfish species throughout the Ohio River basin
FIGURE 8. Faxonius elix n. sp.: Male Form I holotype (A–D; H, J, K), morphotype male Form II (E, F), and allotype female (G, I). Lateral aspect of carapace (A); mesial and lateral aspect of Form I male gonopod, respectively (B–C), mesial view of entire gonopod of Form I male (D); mesial and lateral aspect of form II male gonopod, respectively (E–F); ventral aspect of epistome (G); dorsal view of carapace (H); ventral view of female annulus ventralis (I); dorsal view of antennal scale (J); dorsal view of right chelae (K). Photographs by Guenter Schuster.
FIGURE 7 in Description of a new species of crayfish in the genus Faxonius (Decapoda: Cambaridae) from the Lower Ohio River Drainage, with evidence of glacial influence on the distribution of some crayfish species throughout the Ohio River basin
FIGURE 7. Comparative plate of key diagnostic differences between Faxonius jeffersoni and Faxonius elix n. sp. Photos include MI gonopod (left column), rostrum (center column), and mandible (right column) of F. elix n. sp. (top row) and F. jeffersoni (bottom row). Arrows point to diagnostic characteristics for F. elix n. sp. Photographs by Guenter Schuster.
FIGURE 4 in Description of a new species of crayfish in the genus Faxonius (Decapoda: Cambaridae) from the Lower Ohio River Drainage, with evidence of glacial influence on the distribution of some crayfish species throughout the Ohio River basin
FIGURE 4. Phylogenetic analyses of the mitochondrial gene cytochrome oxidase subunit 1 (CO1) using newly generated sequence data and all publicly available Cambaridae sequence data. TOP LEFT: Maximum Likelihood analysis of all Cambaridae with the genus Faxonius highlighted (gray box). Star on the bottom clade indicates the same branch as the phylogeny on the right. Bottom Left: Unrooted phylogenetic network of the genus Faxonius. Blue circle indicates the same clade as the phylogeny on the right. Right: Excerpt from the tree on the left showing the focal group of this study, including F. jeffersoni and F. elix. Black dots above branches indicate maximum likelihood values>95%.
FIGURE 2 A–G in Description of a new species of crayfish in the genus Faxonius (Decapoda: Cambaridae) from the Lower Ohio River Drainage, with evidence of glacial influence on the distribution of some crayfish species throughout the Ohio River basin
FIGURE 2 A–G. Box pots of scaled body measurements of FI male Faxonius jeffersoni and Faxonius elix, new species. Black dots represent outliers. Measurements made to the nearest 0.01mm.
FIGURE 10. Typical habitat for Faxonius elix n in Description of a new species of crayfish in the genus Faxonius (Decapoda: Cambaridae) from the Lower Ohio River Drainage, with evidence of glacial influence on the distribution of some crayfish species throughout the Ohio River basin
FIGURE 10. Typical habitat for Faxonius elix n. sp. throughout its range with signs of anthropogenic alternation.
FIGURE 3 in Description of a new species of crayfish in the genus Faxonius (Decapoda: Cambaridae) from the Lower Ohio River Drainage, with evidence of glacial influence on the distribution of some crayfish species throughout the Ohio River basin
FIGURE 3. Results of principle components analysis of standardized measurements of Faxonius elix n. sp. and Faxonius jeffersoni. Triangles represent F. jeffersoni. Circles represent F. elix n. sp. Polygons were constructed based on 95% confidence intervals.
FIGURE 1 in Description of a new species of crayfish in the genus Faxonius (Decapoda: Cambaridae) from the Lower Ohio River Drainage, with evidence of glacial influence on the distribution of some crayfish species throughout the Ohio River basin
FIGURE 1. Field surveys undertaken to collect individuals for genetic and morphometric analysis. Crosses represent localities where Faxonius elix was detected. Circles represent areas where F. jeffersoni was detected. Stars represent localities where F. ronaldi was detected. Triangles represent areas where F. illinoiensis was detected.
FIGURE 9. Type locality for Faxonius elix n in Description of a new species of crayfish in the genus Faxonius (Decapoda: Cambaridae) from the Lower Ohio River Drainage, with evidence of glacial influence on the distribution of some crayfish species throughout the Ohio River basin
FIGURE 9. Type locality for Faxonius elix n. sp., Fern Creek at Feganbush Lane (Kentucky Highway 864) crossing, Jefferson County, Kentucky (38.160374o N, -85.639214o W. Photograph taken on November 19, 2018.
FIGURE 5 in Description of a new species of crayfish in the genus Faxonius (Decapoda: Cambaridae) from the Lower Ohio River Drainage, with evidence of glacial influence on the distribution of some crayfish species throughout the Ohio River basin
FIGURE 5. Preglacial drainages and glacial maximum of the Wisconsin, Illinois, and Pre-Illinois glaciation events. Areas shaded by diagonal lines indicate the approximate extent of glacial Lake Tight. Map modified from Taylor and Niemiller, 2016.
FIGURE 5 in Two new species of freshwater crayfish of the genus Faxonius (Decapoda: Cambaridae) from the Ozark Highlands of Arkansas and Missouri
FIGURE 5. Photo of the type locality of Faxonius roberti, new species, taken on the mainstem of the Spring River, 135 meters upstream of the Bayou Access boat ramp (36.433959, -91.527190,WGS84).
FIGURE 4 in Two new species of freshwater crayfish of the genus Faxonius (Decapoda: Cambaridae) from the Ozark Highlands of Arkansas and Missouri
FIGURE 4. Faxonius roberti, new species; all from holotype male Form-I (CMNH 38749), except D and E from morphotype male Form-II (CMNH 38751), and I from allotype female (CMNH 38750). A) lateral aspect of carapace; B–C) mesial and lateral aspect of Form-I male gonopod, respectively; D–E) mesial and lateral views of Form-II male gonopod, respectively; F) mesial view of entire gonopod of male Form-I gonopod; G) dorsal aspect of antennal scale; H) dorsal veiw of carapace; I) ventral aspect of the female annulus ventralis; J) dorsal aspect of merus of first pereiopod (=cheliped) showing location of spines; K) dorsal aspect of distal podomeres of the right cheliped. Plate by Guenter A. Schuster.
FIGURE 3 in Two new species of freshwater crayfish of the genus Faxonius (Decapoda: Cambaridae) from the Ozark Highlands of Arkansas and Missouri
FIGURE 3. Dorsal view of Faxonius roberti new species, holotype, male form-I (CMNH 38749) from the type locality.
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