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163 results for “Alligator”
Figure 10 in Growth and textural ageing in long bones of the American alligator Alligator mississippiensis (Crocodylia: Alligatoridae)
Figure 10. Relationships between bone texture type and femur length body-size proxy for individuals of known sex. A, male femora. B, female femora. C, male tibiae. D, female tibiae. E, male humeri. F, female humeri.
Figure 8 in Growth and textural ageing in long bones of the American alligator Alligator mississippiensis (Crocodylia: Alligatoridae)
Figure 8. Examples of grossly smooth and muted persistent coarse surfaces. A, shallow surface dimples (arrows) (MOR HIP2001-08R-32, femur). B, smooth surface (FWC 40853, femur). C, muted texture, femoral fourth trochanter (FWC 40853). D, muted texture, femoral proximal lateral (dorsal) surface (FWC 40859). Scale bars = 1 cm.
Figure 2 in Growth and textural ageing in long bones of the American alligator Alligator mississippiensis (Crocodylia: Alligatoridae)
Figure 2. Diagrammatic representation of Alligator long bones showing locations of thin sections used in histological analyses in relation to major bone contours. Elements are all drawn to the same scale and are not in proportion to one another as they would be in a single individual. A, femur, caudomedial (caudoventral) view. B, tibia, cranial view. C, humerus, cranial (ventral) view.
Figure 1 in Growth and textural ageing in long bones of the American alligator Alligator mississippiensis (Crocodylia: Alligatoridae)
Figure 1. Diagrammatic representation of Alligator long bones illustrating bone landmarks used in determining sizeindependent maturity estimates. Elements are all drawn to the same scale and are not in proportion to one another as they would be in a single individual. Numbers correspond to character definitions in Appendix 1. A, femur, craniolateral (craniodorsal) view. B, femur, caudomedial (caudoventral) view. C, tibia, cranial view. D, tibia, caudal view. E, humerus, cranial (ventral) view. F, humerus, caudolateral (dorsocranial) view.
Figure 7 in Growth and textural ageing in long bones of the American alligator Alligator mississippiensis (Crocodylia: Alligatoridae)
Figure 7. Examples of porous surface patterns. A, fuzzy fibrous pattern with visible pores (UF 109039, femur). B, fuzzy fibrous pattern without visible pores (UF 109039, humerus). C, etched porosity with connecting surface grooves (UF 38974, femur). D, etched porosity (FWC 35119, humerus). E, porous surface (top) grading into radiating fibrous surface (bottom) (FWC LGS1, femur). F, dotted porosity (FWC LGS2, femur). G, overprinted etched and dotted porosity, etched more prominent (ROM R4415, femur). H, overprinted etched and dotted porosity, dotted more prominent (FWC LGS1, femur). Scale bars = 1 cm.
Figure 4 in Growth and textural ageing in long bones of the American alligator Alligator mississippiensis (Crocodylia: Alligatoridae)
Figure 4. Consensus results of cluster analyses of bone landmark characters. Distance metric is normalized percent disagreement. Complete linkage method (farthest neighbour). Numbers in parentheses represent ontogenetic stages. 'Groups' represent individuals of the same ontogenetic stage grouped together to reduce the size of the trees; included individuals are listed in Appendix 2. A, femur: tree based on distributions of characters 1, 4, 5, 8 and 10. B, tibia: tree based on distributions of characters 5, 6, 7, 8 and 9. C, humerus: tree based on distributions of characters 1, 3, 4, 6, 7 and 8.
Figure 6 in Growth and textural ageing in long bones of the American alligator Alligator mississippiensis (Crocodylia: Alligatoridae)
Figure 6. Examples of persistent coarse surfaces. A, femoral fourth trochanter in caudomedial (caudoventral) view (FWC LGS2). B, femoral proximal lateral (dorsal) surface (FWC LGS1). C, humeral medial (caudal) condyle in caudomedial (dorsocaudal) view, collateral ligament attachment site (FWC 35119). D, humeral deltopectoral crest, lateral (cranial) surface (FWC LGS3). E, humeral deltopectoral crest, craniomedial (ventrocaudal) surface (FWC 35119). F, adductor ridges on caudal surface of femoral shaft (FWC LGS2). Proximal is toward the top in all images. Scale bars = 1 cm.
Figure 3 in Growth and textural ageing in long bones of the American alligator Alligator mississippiensis (Crocodylia: Alligatoridae)
Figure 3. Strict consensus trees resulting from parsimony analyses. Numbered ontogenetic stages are defined in Table 2. A, femur: strict consensus of 34 281 trees, tree length = 18, CI = 0.3846. B, tibia: strict consensus of 357 trees, tree length = 13, CI = 0.5077. C, humerus: strict consensus of 36 trees, tree length = 15, CI = 0.4286.
Figure 9 in Growth and textural ageing in long bones of the American alligator Alligator mississippiensis (Crocodylia: Alligatoridae)
Figure 9. Relationship between bone texture type and femur length body-size proxy for all elements. A, femora. B, tibiae. C, humeri.
The Reef Fish faunas of 6 sites in the Greater Caribbean: Alligator Reef, Bermuda, Curacao, Roatan, St. Croix and St. Eustatius
<p>Species of marine fishes in Families with members known to associate with shallow reefs in the Greater Caribbean. For each species its island(s) of occurrence are indicated, together with whether or not it is a reef-associate, its habitat usage (pelagic, demersal or benthic), for benthic species whether or not it is cryptobenthic, whether or not it is a member of a Core Coral Reef Fish Family, whether or not is maximum size is less than 10 cm TL, and whether or not it is restricted to deep water , ie below 40 m. </p> <p>These ecological characteristics are described in more detail in: Robertson DR, Tornabene L (2020) Reef-associated Bony Fishes of the Greater Caribbean: A Checklist (VERSION 3). <a href="https://zenodo.org/record/3974538#.X7a0W81KiUl">Zenodo</a>. DOI 10.5281/zenodo.4279301 </p>
The influence of incubation temperature on offspring traits varies across northern and southern populations of the American alligator (Alligator mississippiensis)
Open the record for dataset details and reuse information.
Data from: Maternal deposition of hormones and contaminants shape the gonadal transcriptome in American alligators
Open the record for dataset details and reuse information.
SNP data for Northern Alligator Lizards
<p>Understanding the processes that shape genetic diversity by either promoting or preventing population divergence can help identify geographic areas that either facilitate or limit gene flow. Furthermore, broadly distributed species allow us to understand how biogeographic and ecogeographic transitions affect gene flow. We investigated these processes using genomic data in the Northern Alligator Lizard (<em>Elgaria coerulea</em>), which is widely distributed in Western North America across diverse ecoregions (California Floristic Province and Pacific Northwest) and mountain ranges (Sierra Nevada, Coastal Ranges, and Cascades). We collected single nucleotide polymorphism (SNP) data from 120 samples of <em>E. coerulea</em>. Biogeographic analyses of squamate reptiles with similar distributions have identified several shared diversification patterns that provide testable predictions for <em>E. coerulea</em>, including deep genetic divisions in the Sierra Nevada, demographic stability of southern populations, and recent post-Pleistocene expansion into the Pacific Northwest. We use genomic data to test these predictions by estimating the structure, connectivity, and phylogenetic history of populations. At least ten distinct populations are supported, with mixed-ancestry individuals situated at most population boundaries. A species tree analysis provides strong support for the early divergence of populations in the Sierra Nevada Mountains and recent diversification into the Pacific Northwest. Admixture and migration analyses detect gene flow among populations in the Lower Cascades and Northern California, and a spatial analysis of gene flow identified significant barriers to gene flow across both the Sierra Nevada and Coast Ranges. The distribution of genetic diversity in <em>E. coerulea</em> is uneven, patchy, and interconnected at population boundaries. The biogeographic patterns seen in <em>E. coerulea</em> are consistent with predictions from co-distributed species.</p>
JC Nichols Fountain - Rider & Alligator
3D Mesh of the J.C. Nichols fountain created from Faro Focus 3D laser scans. Source: Objaverse 1.0 / Sketchfab
Transcriptional networks underlying a primary ovarian insufficiency disorder in alligators naturally exposed to EDCs: Transformed read counts and supplementary materials
<p>Interactions between the endocrine system and environmental contaminants are responsible for impairing reproductive development and function. Despite the taxonomic diversity of affected species and attendant complexity inherent to natural systems, the underlying signaling pathways and cellular consequences are mostly studied in lab models. To resolve the genetic and endocrine pathways that mediate affected ovarian function in organisms exposed to endocrine disrupting contaminants in their natural environments, we assessed broad-scale transcriptional and steroidogenic responses to exogenous gonadotropin stimulation in juvenile alligators (<em>Alligator missippiensis</em>) originating from a lake with well-documented pollution (Lake Apopka, FL) and a nearby reference site (Lake Woodruff, FL). We found that individuals from Lake Apopka are charachterized by hyperandrogenism and display hyper-sensitive transcriptional responses to gonadotropin stimulation when compared to individuals from Lake Woodruff. Site-specific transcriptomic divergence appears to be driven by wholly distinct subsets of transcriptional regulators, indicating alterations to fundamental genetic pathways governing ovarian function. Consistent with broad-scale transcriptional differences, ovaries of Lake Apopka alligators displayed impediments to folliculogenesis, with larger germinal beds and decreased numbers of late-stage follicles. After resolving the ovarian transcriptome into clusters of co-expressed genes, most site-associated modules were correlated to ovarian follicule phenotypes across individuals. However, expression of two site-specific clusters were independent of ovarian cellular architecture and are hypothesized to represent alterations to cell-autonomous transcriptional programs. Collectively, our findings provide high resolution mapping of transcriptional patterns to specific reproductive function and advance our mechanistic understanding regarding impaired reproductive health in an established model of environmental endocrine disruption.</p>
Sexual dimorphism of the gut microbiota in the Chinese alligator and its convergence in the wild environment
<p>The gut microbiota forms a complex microecosystem in vertebrates and is affected by various factors. As a key intrinsic factor, sex has a persistent impact on the formation and development of gut microbiota. Few studies have analysed sexual dimorphism of gut microbiota, particularly in wild animals. We used 16S rRNA sequencing to analyse the gut microbiota of juvenile and adult Chinese alligators, and untargeted metabolomics to study serum metabolomes of adult alligators. We observed significant sex-biased differences in the community diversity in juvenile, but not adult, alligators. In terms of taxonomic composition, the phylum Fusobacteriota and genus <em>Cetobacterium</em> were highly abundant in adult alligators, similar to that in carnivorous fishes, whereas the gut microbiota composition in juvenile alligators resembled that in terrestrial reptiles, indicating that adults are affected by their wild aquatic environment and lack sex dimorphism in gut microbiota. The correlation analysis revealed that the gut microbiota of adults was also affected by cyanobacteria in the external environment, and this effect was sex-biased and mediated by sex hormones. Overall, this study reveals sexual differences in the gut microbiota of crocodilians and their convergence in the external environment. It also provides insights into host-microbiota interactions in the wild.</p>
Alligator limb bone. Gray Fossil Site, TN
Alligator limb bone from Gray Fossil Site, TN. Pliocene. On exhibit at the McClung Museum, University of Tennessee, Knoxville. Source: Objaverse 1.0 / Sketchfab
Geographic Zone Report for AR.docx: a summary of REEF surveys for Alligator Reef from 1 January 1993 to 7 February 2016.
<p>Geographic Zone Report for AR.docx: a summary of REEF surveys for Alligator Reef from 1 January 1993 to 7 February 2016. from </p> <p>Starck, W.A., Estapé C.J. & Morgan Estapé, A. (2017) The fishes of Alligator Reef and environs in the Florida Keys: a half-century update. Journal of the Ocean Science Foundation, 27, 74–117.<br> </p>
Alligator Reef checklist.xlsx: the spreadsheet version of the checklist of Alligator Reef fishes, from Starck, W.A., Estapé C.J. & Morgan Estapé, A. (2017) The fishes of Alligator Reef and environs in the Florida Keys: a half-century update. Journal of the Ocean Science Foundation, 27, 74–117.
<p>Alligator Reef checklist.xlsx: the spreadsheet version of the checklist of Alligator Reef fishes, from Starck, W.A., Estapé C.J. & Morgan Estapé, A. (2017) The fishes of Alligator Reef and environs in the Florida Keys: a half-century update. Journal of the Ocean Science Foundation, 27, 74–117.</p>
AlligatorReefPhotos.pdf: a selection of images of various reef habitats on Alligator Reef, Florida Keys, from both the 1960s and today, for Starck, W.A., Estapé C.J. & Morgan Estapé, A. (2017) The fishes of Alligator Reef and environs in the Florida Keys: a half-century update. Journal of the Ocean Science Foundation, 27, 74–117.
<p>AlligatorReefPhotos.pdf: a selection of images of various reef habitats from both the 1960s and today, for Starck, W.A., Estapé C.J. & Morgan Estapé, A. (2017) The fishes of Alligator Reef and environs in the Florida Keys: a half-century update. Journal of the Ocean Science Foundation, 27, 74–117.</p>
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Allen Brain Atlas
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