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163 results for “Alligator”
Alligator pond food-web sampling in Shark River Slough and Taylor Slough, Everglades National Park, Florida, USA, 2018–2019
These datasets were used to investigate if American Alligators engineer differences in nutrient availability and changes to community structure by their creation of “alligator ponds” compared to the surrounding phosphorus (P)-limited oligotrophic marsh in the Everglades. We used a halo sampling design of three distinct habitats extending outward from ten active alligator ponds across a hydrological gradient. We performed nutrient analysis on basal food-web resources and quantitative community analyses, and stoichiometric analyses on plants and animals. These data underly the work in Strickland et al. (2023). An apex predator engineers wetland food-web heterogeneity through nutrient enrichment and habitat modification. Journal of Animal Ecology.
American alligator GPS tracking study from May 2008 to September 2010 on Sapelo Island, Georgia
We deployed GPS tracking units on seven adult American alligators (two females and five males), for periods ranging from 34 to 100 days from May 2008 to September 2010 on Sapelo Island, Georgia. GPS units were set to record the location of tracked alligators every 1.5 to 2 hours. GPS data were then downloaded and tracks analyzed using GIS software after recapture.
Fig. 4 in Thermal ecology of the Pygmy Alligator Lizard, Gerrhonotus parvus Knight and Scudday, 1985 (Squamata: Anguidae), in Nuevo Léon, Mexico
Fig. 4. Relationship between body temperature (T b), air temperature (T) and substrate temperature (T) for Gerrhonotus a s parvus of Sierra Madre Oriental in Nuevo León, Mexico.
Fig. 1 in Thermal ecology of the Pygmy Alligator Lizard, Gerrhonotus parvus Knight and Scudday, 1985 (Squamata: Anguidae), in Nuevo Léon, Mexico
Fig. 1. Distribution of Gerrhonotus parvus in northeastern Mexico. The stars indicate the localities of specimens used in this study: Cañon de San Isidro, Santiago (white star) and Ejido Santa Rita, Galeana (black star). The coordinates are shown around the edges of the map in the UTM/WGS84 metric system.
FIGURE 7 in Oldest record of Alligator in southeastern North America
FIGURE 7. Box and whisker plots of dorsal skull length of published fossil Alligator specimens and extant Alligator mississippiensis (this study). For data, see Table 3. Time shown in millions of years ago (MYA). UF 422816, an isolated right premaxilla, was estimated following methods outlined in the main document. Most notable is that the estimated dorsal skull length for UF 422816 is small, similar to ancestral forms such as Allognathosuchus, Procaimanoidea, and Wannaganosuchus. Global temperature curve from Zachos et al. (2001).
FIGURE 6. X-Y in Oldest record of Alligator in southeastern North America
FIGURE 6. X-Y scatter plot of premaxillary-maxillary suture lengths compared to dorsal skull length of extant Alligator (n = 22). Linear regression is best-fit line (R2 = 0.9917).
FIGURE 4. Alligatorid fossils from the Live Oak fossil site. A in Oldest record of Alligator in southeastern North America
FIGURE 4. Alligatorid fossils from the Live Oak fossil site. A: Isolated tooth, likely mid-rostral position (UF 424640) in lingual view. B: Isolated tooth, likely anterior position (UF 424639) in lingual view. C: Caudal vertebra exhibiting a fully fused neurocentral suture (UF 424637) in left lateral view. D: Caudal vertebra exhibiting a fully fused neurocentral suture (UF 424638) in left lateral view. E: Osteoderm (UF 424633) in dorsal view. F: Osteoderm (UF 424635) in dorsal view.
FIGURE 5 in Oldest record of Alligator in southeastern North America
FIGURE 5. Isolated osteoderm fragment attributed to Alligatoridae from the I-75 fossil site (UF 16729) in dorsal view.
FIGURE 3. Alligator fossils from the late Oligocene Brooksville 2 in Oldest record of Alligator in southeastern North America
FIGURE 3. Alligator fossils from the late Oligocene Brooksville 2 site in northern Florida. A, B: Dorsal view of parietal (UF 333984). C, D: Cranial fragment (UF 425424) in dorsal (C) and ventral (D) views; position is uncertain. E: Alligatorid tooth from posterior dentition (UF 422818). F: Alligatorid tooth from middle dentition (UF 422819). G: Alligatorid tooth from middle dentition (UF 422820). Fragment of right dentary (UF 425402) in lateral (H) and medial (I) views. Right articular (UF 422817) in dorsal (J), lateral (K), and medial (L) views. Dorsal osteoderm (UF 424647) in dorsal view (M) and left lateral view (N). Anterior portion of osteoderm (UF 425398) in dorsal view (O). Partial osteoderm (UF 422827) in dorsal view (P). Osteoderm (UF 425395) in dorsal view (Q). Neural arch of a dorsal vertebra (UF 424653) in posterior view (R). Ungual (UF 424655) in lateral view (S). Ungual (UF 425405) in lateral view (T). U, V: Caudal vertebra in left lateral view (UF 425435). Abbreviations: f-p, frontoparietal; i s, imbricating shelf; m k, median keel; nc, neurocentral; po-p, postorbital-parietal; sq-p, squamosal-parietal; stf, supratemporal fenestra.
FIGURE 2 in Oldest record of Alligator in southeastern North America
FIGURE 2. Right premaxilla of Alligator from the late Oligocene Brooksville 2 site in northern Florida (UF 422816). Element shown in dorsal (A, D), lateral (B, E), and ventral (C, F) views, with photos and interpretive sketches. Abbreviations: d4 o p, occlusal pit for the fourth dentary tooth; e n, external naris; i f, incisive foramen; pm 3–5, premaxillary alveoli 3–5; pmx-mx, premaxillary-maxillary; pmx-n, premaxillary-nasal; pmx-pmx, premaxillary-premaxillary.
Fig. 3 in Gastric nematode diversity between estuarine and inland freshwater populations of the American alligator (Alligator mississippiensis, daudin 1802), and the prediction of intermediate hosts
Fig. 3. Prey content species richness accumulation curves based on 1000 randomizations using Estimate 9.1.0. Data obtained from stomach flushing or necropsy of American alligators from (A) coastal or (B) inland habitats between 2008 and 2011. The black broken line (- -) represents the upper 95% confidence level, and the broken dotted broken line (- · -) represents the lower 95% confidence level of the species accumulation curve. The slow approach to the asymptote in coastal habitats suggests prey contents of sampled alligators did not capture all probable prey. The asymptote of inland alligators slowly begins to plateau, which may suggest our sampling efforts were close to capturing most of the probable prey of alligators.
Fig. 2 in Gastric nematode diversity between estuarine and inland freshwater populations of the American alligator (Alligator mississippiensis, daudin 1802), and the prediction of intermediate hosts
Fig. 2. Nematode species richness accumulation curve (A) and Coleman rarefaction curve (B) based on 1000 randomizations using Estimate 9.1.0. The black broken line (- -) represents the upper 95% confidence level, and the broken dotted broken line (- · -) represents the lower 95% confidence level of the species accumulation curve (A). Upper and lower Coleman standard deviations are represented by solid black lines (B). Data obtained from stomach flushing or necropsy of American alligators from Florida and Georgia between 2008 and 2011. The rapid approach to the asymptote suggests we captured all possible species of alligator nematodes.
Fig. 2. Alligator mississippiensis Daudin, 1802 in New data on the anatomy and relationships of the Paleocene crocodylian Akanthosuchus langstoni
Fig. 2. Alligator mississippiensis Daudin, 1802. SBU Rp8, Recent, from southern Louisiana, USA. Dorsal osteoderms from different locations along the trunk. A. Nuchal osteoderm in superficial (A1), deep (A2), and lateral (A3) views. B. Mid−dorsal osteoderm in superficial (B1), deep (B2), and lateral (B3) views. C. Dorsolateral osteoderm in superficial (C1), deep (C2), and lateral (C3) views. D. Caudal osteoderm in superficial (D1), deep (D2), and lateral (D3) views.
Figure 17 in Growth and textural ageing in long bones of the American alligator Alligator mississippiensis (Crocodylia: Alligatoridae)
Figure 17. Histology of muted persistent coarse surfaces. A, attachment of m. puboischiofemoralis (FWC 40583, femur section b). B, fourth trochanter (FWC 40583, femur section b). Scale bars = 919 µm.
Figure 18 in Growth and textural ageing in long bones of the American alligator Alligator mississippiensis (Crocodylia: Alligatoridae)
Figure 18. Individual variation in surface pattern and growth in Lake Griffin alligators. A, overprinted etched and dotted porosity (FWC 40723, femur). B, mainly smooth surface with faint scattered dotted porosity (FWC 40583, femur). C, fibrolamellar zones underlying porous surface shown in A (FWC 40723, femur section c). D, lamellar zones underlying smooth surface shown in B (FWC 40583, femur section c). Scale bars: A, B = 1 cm; C, D = 919 µm.
Figure 16 in Growth and textural ageing in long bones of the American alligator Alligator mississippiensis (Crocodylia: Alligatoridae)
Figure 16. Histology of normal persistent coarse surfaces. A, Sharpey's fibres (arrows) visible as black thread-like structures beneath the bone surface (FWC LGS8, tibia section a). B, collateral ligament attachment site (FWC 40583, femur section e). C, fourth trochanter. Arrow indicates recently enclosed channel (FWC 40723, femur section b). D, attachment of m. puboischiofemoralis (FWC LGS1, femur section b). E, lateral (cranial) surface of deltopectoral crest (FWC 40723, humerus section b). F, humeral proximal cranial (ventral) surface. Arrows indicate recently enclosed channels (FWC 35119, humerus section a). Scale bars: A = 230 µm; B–F = 919 µm.
Figure 15. Histology underlying grossly smooth surface patterns. A in Growth and textural ageing in long bones of the American alligator Alligator mississippiensis (Crocodylia: Alligatoridae)
Figure 15. Histology underlying grossly smooth surface patterns. A, slight surface undulations (arrows) associated grossly with shallow dimples (FWC 40854, femur section b). B, smooth surface underlain by zone of lamellar bone (FWC 40583, humerus section c). C, smooth surface underlain by annulus. Arrows indicate annuli throughout cortex (FWC LGS8, tibia section d). Scale bars = 230 µm.
Figure 12 in Growth and textural ageing in long bones of the American alligator Alligator mississippiensis (Crocodylia: Alligatoridae)
Figure 12. Possible geographical effect on the relationships between bone texture type and femur length body-size proxy for wild individuals of known sex. A, femora of Florida animals. B, tibiae of Florida animals. C, humeri of Florida animals. D, tibiae of Everglades animals only. E, humeri of Everglades animals only.
Figure 14. Histology underlying porous surface patterns. A in Growth and textural ageing in long bones of the American alligator Alligator mississippiensis (Crocodylia: Alligatoridae)
Figure 14. Histology underlying porous surface patterns. A, zone of fibrolamellar bone underlying etched porous surface (FWC 40723, tibia section c). B, fibrolamellar zone with large radial channels (arrow) underlying surface with overprinted dotted and etched porosity (FWC 40723, femur section c). C, longitudinal channels underlying radiating fibrous region, with arrows indicating channels intersecting and recently incorporated into the bone surface (FWC LGS4, femur section d). D, channels in varying orientations underlying dotted porous surface (FWC LGS1, femur section c). E, zone of lamellar bone underlying dotted porous surface (FWC 40583, humerus section c). Scale bars = 230 µm.
Figure 13 in Growth and textural ageing in long bones of the American alligator Alligator mississippiensis (Crocodylia: Alligatoridae)
Figure 13. Relationships between bone texture type and cluster-based percentage maturity indices. Circle diameter proportional to number of individuals. A, femora: three individuals 25% mature, 21 individuals 50% mature, 61 individuals 75% mature, 24 individuals 100% mature. B, tibiae: one individual 0% mature, 16 individuals 33% mature, 24 individuals 67% mature, four individuals 100% mature. C, humeri: three individuals 0% mature, seven individuals 33% mature, 32 individuals 67% mature, six individuals 100% mature.
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