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124 results for “iguana”
Figure 1 in Is Geckobiella stamii (Acari: Pterygosomatidae) a hyperparasite or phoretic on Amblyomma dissimile (Acari: Ixodidae) associated with Iguana iguana from Panama?
Figure 1 Map of the locations where Geckobiella stamii was found associated withAmblyomma dissimile. 1: Corozal, Panama province; 2: Bugaba, Chiriquí province; 3: Tonosí, Los Santos province.
Interactions data on Iguana iguana and other taxa from the Cayman Islands, extended with interaction data of Cyclura lewisi
<p>Biotic interactions data of the Green Iguana (<em>Iguana iguana), </em>extracted from the literature. Extended data set with species interaction data of the Blue Iguana (<em>Cyclura lewisi</em>) from the Cayman Islands.</p>
Figure 6 in Gastroesophageal tube of the Iguana iguana (Iguanidae): histological description, histochemical and immunohistochemical analysis of 5-HT and SS cells
Figure 6. Immunoreactivity for Serotonin (5-HT) a-g and Somatostatin (SS) i-h in histological sections of the oesophagus (a,b), cranial stomach (c), middle stomach (d,e) and caudal stomach (f-i) of I. iguana. a-g Serotonin-positive cells (arrow). h,i Somatostatin-positive cells (arrowhead) in the caudal region of the stomach.
Figure 5 in Gastroesophageal tube of the Iguana iguana (Iguanidae): histological description, histochemical and immunohistochemical analysis of 5-HT and SS cells
Figure 5. Histological sections of caudal region in stomach. The epithelium lining (EP) is simple columnar with gastric glands (G) in the lamina propria (LP). M: mucosa. Note the thickening of the muscular layer (ML) and the presence of serosa (S). Detail of mucous layer with epithelium (EP), lamina propria (LP), gastric glans (G), muscularis mucosa (MM) and submucosa (SM). HE staining. Bars = 300 µm.
Figure 4 in Gastroesophageal tube of the Iguana iguana (Iguanidae): histological description, histochemical and immunohistochemical analysis of 5-HT and SS cells
Figure 4. Histological sections of cranial and middle region in stomach. Note the gastric glands are more developed in the middle region, occupying a large part of the lamina propria (star). M: mucosa, SM: submucosa, ML: muscular layer and S: serosa. HE staining.
Figure 1 in Gastroesophageal tube of the Iguana iguana (Iguanidae): histological description, histochemical and immunohistochemical analysis of 5-HT and SS cells
Figure 1. Histological sections of the mucosa layer of I. iguana in different regions of the oesophagus and stomach. HE. Bars = 100 µm. Caudal eosophagus 20 µm.
Figure 3 in Gastroesophageal tube of the Iguana iguana (Iguanidae): histological description, histochemical and immunohistochemical analysis of 5-HT and SS cells
Figure 3. Histological sections of cervical oesophagus of I. iguana. Observe longitudinal folds. Absence of glands in the lamina propria (LP) and submucosa (SM), and evident muscular layer (ML) and adventitia (A). Bars = 3 mm. Detail of mucous layer with epithelium (EP), lamina propria (LP) and muscularis mucosa (MM). Gomori`s tricrome staining.
Figure 2 in Gastroesophageal tube of the Iguana iguana (Iguanidae): histological description, histochemical and immunohistochemical analysis of 5-HT and SS cells
Figure 2. Histological sections of the (a,b) oesophagus, (c) cranial, (d) middle and (e-f) caudal regions of stomach of I. iguana. (a) After Periodic Acid Schiff (PAS) staining the glycoconjugates are identified in magenta in the goblet cells (arrow) in oesophagus; (b) The ephitelium (EP) of oesophagus has positive histochemical reaction to Alcian Blue (AB, pH 2.5); (c-f) The epithelium lining of stomach is simple columnar mucous with positive histochemical reactions to PAS (c,e) and AB (d,f). (c) Note the mucous cells PAS-positive along the glands (arrowhead) in cranial region of stomach; (e) In caudal region gastric glands (G) are positive only for PAS reaction.
Graph 1 in Gastroesophageal tube of the Iguana iguana (Iguanidae): histological description, histochemical and immunohistochemical analysis of 5-HT and SS cells
Graph 1. Number of 5-HT and SS-cells/µm2 per oesophageal and gastric region in I. iguana. Values are averages with their standard deviatin shown by vertical bars (p = 0,05). Cervical oesophagus (CER): 4.6x10-2 ± 2.0 [5-HT cells]/µm2. Celomatic oesophagus (CEL): 4.0x10-2 ± 1.0 [5-HT cells]/µm2. Cranial and middle regions of the stomach (C/MS): 6.18x10-2 ± 3.2 [5-HT cells]/µm2. Caudal Stomach (CS): 0.6x10-2 ± 0.2 [5-HT cells]/µm2 and 1.4x 10-2 ± 0.9 [SS-cells]/µm2.
Interactions data on Iguana iguana and other taxa from its native and invasive range
<p>Biotic interactions data of the Common Green Iguana (<em>Iguana iguana)</em> and other taxa from its native distribution and areas where it has been introduced. This represents an addition to the previously published data set 10.5281/zenodo.6355576</p>
Heterozygosity–fitness correlations reveal inbreeding depression in neonatal body size in a critically endangered rock iguana
Inbreeding depression, though challenging to identify in nature, may play an important role in regulating the dynamics of small and isolated populations. Conversely, greater expression of genetic load can enhance opportunities for natural selection. Conditional expression concentrates these opportunities for selection and may lead to failure of detection. This study investigates the possibility for age-dependent expression of inbreeding depression in a critically endangered population of rock iguanas, Cyclura nubila caymanensis. We employ heterozygote-fitness correlations to examine the contributions of individual genetic factors to body size, a fitness-related trait. Nonsignificant reductions in homozygosity (up to 7%) were detected between neonates and individuals surviving past their first year, which may reflect natural absorption of inbreeding effects by this small, fecund population. The majority of variation in neonate body size was attributed to maternal or environmental effects (i.e., clutch identity and incubation length); however, heterozygosity across 22 microsatellite loci also contributed significantly and positively to model predictions. Conversely, effects of heterozygosity on fitness were not detectable when adults were examined, suggesting that inbreeding depression in body size may be age dependent in this taxon. Overall, these findings emphasize the importance of taking holistic, cross-generational approaches to genetic monitoring of endangered populations.
Data from: Iguanas rafted more than 8,000 km from North America to Fiji
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Heterozygosity–fitness correlations reveal inbreeding depression in neonatal body size in a critically endangered rock iguana
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Conditional female strategies influence hatching success in a communally-nesting iguana
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Data from: Genetic structure at three spatial scales is consistent with limited philopatry in Ricord's Rock Iguanas (Cyclura ricordii)
Cyclura ricordii is an endemic iguana from Hispaniola Island and is threatened on the IUCN Red List. The main threats are predation by introduced mammals, habitat destruction, and hunting pressure. The present study focused on two nesting sites from Pedernales Province in the Dominican Republic. The hypothesis that natal philopatry influences dispersal and nest site selection was tested. Monitoring and sampling took place in 2012 and 2013. Polymorphic markers were used to evaluate whether natal philopatry limits dispersal at multiple spatial scales. Ripley's K revealed that nests were significantly clustered at multiple scales, when both nesting sites were considered and within each nesting site. This suggests a patchy, non-random distribution of nests within nest sites. Hierarchical AMOVA revealed that nest site aggregations did not explain a significant portion of genetic variation within nesting sites. However, a small but positive correlation between geographic and genetic distance was detected using a Mantel's test. Hence, the relationship between geographic distance and genetic distance among hatchlings within nest sites, while detectable, was not strong enough to have a marked effect on fine scale genetic structure. Spatial and genetic data combined determined that the nesting sites included nesting females from multiple locations, and the hypothesis of 'natal philopatry', was not supported because females nesting in the same cluster were no more closely related to each other than to other females from the same nesting site. These findings imply that nesting aggregations are more likely associated with cryptic habitat variables contributing to optimal nesting conditions.
Data from: Evidence for dominant males but not choosy females in an insular rock iguana
In natural populations susceptible to inbreeding depression, behaviors such as female promiscuity and disassortative mating may enhance the production of outbred progeny and help maintain genetic variation at the population-level. However, empirical tests of such hypotheses have largely focused on mating systems in which female choice is known to play a large role. In insular reptile populations, cryptic choice may be important for overcoming constraints on precopulatory choice and diversifying breeder representation. We carried out pedigree reconstructions of 50 clutches of critically endangered Cyclura nubila caymanensis (Sauria: Iguanidae) to investigate the prevalence and efficacy of strategies theorized to optimize genetic compatibility among mate pairs. We found that females mating disassortatively and multiply, but not with respect to male heterozygosity, tended to produce more heterozygous offspring on average. Pair relatedness also had a negative effect on hatching success, while additional sires positively influenced clutch size. Despite evidence for direct and indirect benefits, females did not mate with more outbred or genetically dissimilar males than expected by chance. Our data imply strong reproductive skew among males, with geographic proximity and body size largely predicting siring success. Multiple-paternity occurred in a minimum of 38% of clutches. Paradoxically, females were not more promiscuous when confronted with more males, as demonstrated at a site supporting high local densities. Our data imply that while female mating behaviors have the potential to confer adaptive benefits in this small population, the trajectory of mating system evolution may be largely constrained by sexual conflict.
Data from: Hybridization masks speciation in the evolutionary history of the Galápagos marine iguana
The effects of the direct interaction between hybridization and speciation—two major contrasting evolutionary processes—are poorly understood. We present here the evolutionary history of the Galápagos marine iguana (Amblyrhynchus cristatus) and reveal a case of incipient within-island speciation, which is paralleled by between-island hybridization. In-depth genome-wide analyses suggest that Amblyrhynchus diverged from its sister group, the Galápagos land iguanas, around 4.5 million years ago (Ma), but divergence among extant populations is exceedingly young (less than 50 000 years). Despite Amblyrhynchus appearing as a single long-branch species phylogenetically, we find strong population structure between islands, and one case of incipient speciation of sister lineages within the same island—ostensibly initiated by volcanic events. Hybridization between both lineages is exceedingly rare, yet frequent hybridization with migrants from nearby islands is evident. The contemporary snapshot provided by highly variable markers indicates that speciation events may have occurred throughout the evolutionary history of marine iguanas, though these events are not visible in the deeper phylogenetic trees. We hypothesize that the observed interplay of speciation and hybridization might be a mechanism by which local adaptations, generated by incipient speciation, can be absorbed into a common gene pool, thereby enhancing the evolutionary potential of the species as a whole.
FIGURE 2 in Conolophus marthae sp. nov. (Squamata, Iguanidae), a new species of land iguana from the Galápagos archipelago
FIGURE 2. Conolophus marthae sp. nov. Holotype. Adult male with brand number 117 and PIT number 091-601-303. The individual is changing skin.
FIGURE 6 in Conolophus marthae sp. nov. (Squamata, Iguanidae), a new species of land iguana from the Galápagos archipelago
FIGURE 6. Head-bob display of Conolophus marthae sp. nov. Multiple series (a, b, c, and d) of head-bob performed by the Holotype (June 2006). The series were performed with the following time intervals between each other: a–b, 27 seconds; b–c, 34 seconds; c–d, 11 seconds.
FIGURE 1 in Conolophus marthae sp. nov. (Squamata, Iguanidae), a new species of land iguana from the Galápagos archipelago
FIGURE 1. Galápagos archipelago. Grey indicates islands were land iguana species occur or have occurred in historic times. Crosses indicate extinction in whole island. A dot indicates Volcan Wolf.
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
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DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.