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174 results for “chameleon”
Simulation Reveals the Chameleonic Behavior of Macrocycles
<p>Supporting Information for article titled "Simulation Reveals the Chameleonic Behavior of Macrocycles"</p>
Reproducibility by Default: Jupyter on Chameleon (screencast)
<p>The Jupyter notebook is an interactive environment that allows users to tell the story of an experiment by combining explanations in text, capturing the process in code, and representing results as images or graphs.</p> <p>The Notebook a particularly useful tool for expressing reproducible experiments because it allows you to record and share the experimental process – as well as the reasoning that went with it -- rather than just the results. Sharing a notebook allows others to easily repeat – and potentially also modify your experiment. This makes “standing on the shoulders of giants” a much easier proposition than ever before.</p>
Fig. 5 in Parasite burden in a short-lived chameleon, Furcifer labordi
Fig. 5. Intensity of mite infestation in adult F. labordi and F. cf. nicosiai.
Fig. 3 in Parasite burden in a short-lived chameleon, Furcifer labordi
Fig. 3. Prevalence of filarial infection in F. labordi and F. cf. nicosiai.
The only complete articulated early Miocene chameleon skull (Rusinga Island, Kenya) suggests an African origin for Madagascar’s endemic chameleons
Open the record for dataset details and reuse information.
Data for: First evidence of yearly allochrony in a terrestrial vertebrate: A case study of an annual chameleon
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Jackson's Chameleon (Trioceros Jacksonii) lizard brain illustration
<p>3D model of the Jackson's Chameleon brain highlighting the anatomy and the spatial arrangement of its major subdivisions.</p> <p>The brain reconstruction was obtained from a microCT scan of a iodine-stained specimen through manual segmentation using the software Amira 5.5.0.</p> <p>Other illustrations can be found <strong><a href="https://zenodo.org/search?page=1&size=20&q=keywords:%22squamate%20brain%22">here</a></strong>.</p> <p><em>If you are interested in reptile brain evolution and behavior, please, have a look to our recent publication:</em></p> <p><a href="https://www.nature.com/articles/s41467-019-13405-w"><em><strong>"Comparative analysis of squamate brains unveils multi-level variation in cerebellar architecture associated with locomotor specialization"</strong></em></a></p> <p><strong>Simone Macrì, Yoland Savriama, Imran Khan & Nicolas Di-Poï</strong></p> <p><em>Nature Communications</em> <strong>10, </strong>5560 (2019)</p> <p> </p> <p><em>Check out also our *4K* video collection of various snake and lizard 3D brains:</em></p> <p><strong><a href="https://www.youtube.com/playlist?list=PLgx4vtT32C8hqxG_icKiuXGtZVLVX-oG1">Snake and Lizard brain reconstructions video collection</a></strong></p> <p> </p> <p>For any inquiries or additional information, please, refer to the contacts provided in the <strong><a href="https://www.nature.com/articles/s41467-019-13405-w">article</a></strong>.</p>
Data from: Alternative mating tactics in male chameleons (Chamaeleo chamaeleon) are evident in both long-term body color and short-term courtship pattern
Alternative mating tactics in males of various taxa are associated with body color, body size, and social status. Chameleons are known for their ability to change body color following immediate environmental or social stimuli. In this study, we examined whether the differential appearance of male common chameleon during the breeding season is indeed an expression of alternative mating tactics. We documented body color of males and used computer vision techniques to classify images of individuals into discrete color patterns associated with seasons, individual characteristics, and social contexts. Our findings revealed no differences in body color and color patterns among males during the non-breeding season. However, during the breeding season males appeared in several color displays, which reflected body size, social status, and behavioral patterns. Furthermore, smaller and younger males resembled the appearance of small females. Consequently, we suggest that long-term color change in males during the breeding season reflects male alternative mating tactics. Upon encounter with a receptive female, males rapidly alter their appearance to that of a specific brief courtship display, which reflects their social status. The females, however, copulated indiscriminately in respect to male color patterns. Thus, we suggest that the differential color patterns displayed by males during the breeding season are largely aimed at inter-male signaling.
Data from: Discovery of a giant chameleon-like lizard (Anolis) on Hispaniola and its significance to understanding replicated adaptive radiations
We report a new chameleon-like Anolis species from Hispaniola that is ecomorphologically similar to congeners found only on Cuba. Lizards from both clades possess short limbs and a short tail and utilize relatively narrow perches, leading us to recognize a novel example of ecomorphological matching among islands in the well-known Greater Antillean anole radiation. This discovery supports the hypothesis that the assembly of island faunas can be substantially deterministic and highlights the continued potential for basic discovery to reveal new insights in well-studied groups. Restricted to a threatened band of midelevation transitional forest near the border of the Dominican Republic and Haiti, this new species appears to be highly endangered.
Data from: Does diet drive the evolution of head shape and bite force in chameleons of the genus Bradypodion?
The head is a complex integrated system that is implicated in many vital functions. As such, its morphology is impacted by different and sometimes conflicting demands. Consequently, head shape varies greatly depending on the environment and dietary ecology of an organism. Moreover, given its role in territory defence and mating in lizards, it is also subjected to strong sexual selection in these animals. We investigated the relationships between head shape, bite performance and diet in 14 of the 17 extant Bradypodion species to determine whether variation in diet can explain the observed diversity in bite force and head shape in this genus. We also evaluate differences between sexes in terms of the relationships between head shape, bite force and diet and predict tighter relationships in females given that the head in this sex is principally under natural selection. Our results show that there is indeed a correlation between head shape, diet and bite force, but the direction and magnitude are sex-dependent. Whereas we observed a correlation between absolute bite force and head shape in both sexes, size-corrected bite force was correlated with mandible and quadrate shape in females only. Despite strong correlations between bite force and prey hardness, and between prey hardness and head shape, we did not find any relationship between head shape and prey evasiveness. These data suggest that the cranial system in chameleons of the genus Bradypodion evolves under natural selection for the ability to eat large or hard prey. Moreover, significant differences in the ecomorphological relationships between the two sexes suggest that sexual selection plays a role in driving the evolution of bite force and head shape. These data suggest that ecomorphological relationships may be sex-dependent.
Data from: Large-scale phylogeny of chameleons suggests African origins and Eocene diversification
Oceanic dispersal has emerged as an important factor contributing to biogeographic patterns in numerous taxa. Chameleons are a clear example of this, as they are primarily found in Africa and Madagascar, but the age of the family is post-Gondwanan break-up. A Malagasy origin for the family has been suggested, yet this hypothesis has not been tested using modern biogeographic methods with a dated phylogeny. To examine competing hypotheses of African and Malagasy origins, we generated a dated phylogeny using between six and 13 genetic markers, for up to 174 taxa representing greater than 90 per cent of all named species. Using three different ancestral-state reconstruction methods (Bayesian and likelihood approaches), we show that the family most probably originated in Africa, with two separate oceanic dispersals to Madagascar during the Palaeocene and the Oligocene, when prevailing oceanic currents would have favoured eastward dispersal. Diversification of genus-level clades took place in the Eocene, and species-level diversification occurred primarily in the Oligocene. Plio-Pleistocene speciation is rare, resulting in a phylogeny dominated by palaeo-endemic species. We suggest that contraction and fragmentation of the Pan-African forest coupled to an increase in open habitats (savannah, grassland, heathland), since the Oligocene played a key role in diversification of this group through vicariance.
FIGURE 1 in A new species of dwarf chameleon (Sauria; Chamaeleonidae, Bradypodion Fitzinger) from KwaZulu Natal South Africa with notes on recent climatic shifts and their influence on speciation in the genus
FIGURE 1. Forest localities for Bradypodion in KwaZulu-Natal. Forests are shown in black, with other vegetation types in grey (lightest to darkest: thicket, grassland, savanna). Map insets show the locations of the enlarged areas. The distribution of forests is shown by the black speckling in the inset of South Africa.
FIGURE 7 in A new species of dwarf chameleon (Sauria; Chamaeleonidae, Bradypodion Fitzinger) from KwaZulu Natal South Africa with notes on recent climatic shifts and their influence on speciation in the genus
FIGURE 7. Bradypodion nemorale, adult male, Qudeni Forest, KZN. Demonstrating phenotypic variation compared to same species from Nkandla Forest.
FIGURE 2 in A new species of dwarf chameleon (Sauria; Chamaeleonidae, Bradypodion Fitzinger) from KwaZulu Natal South Africa with notes on recent climatic shifts and their influence on speciation in the genus
FIGURE 2. Bayesian consensus phylogram for the genus Bradypodion, including chameleons from six forests in KwaZulu-Natal. Bayesian posterior probabilities are given above each node, whereas parsimony bootstrap values are given below each node. Only supported nodes are labeled.
FIGURE 6 in A new species of dwarf chameleon (Sauria; Chamaeleonidae, Bradypodion Fitzinger) from KwaZulu Natal South Africa with notes on recent climatic shifts and their influence on speciation in the genus
FIGURE 6. Bradypodion nemorale, adult male, Nkandla Forest, KZN. Demonstrating red interstitial web on the flank and superficial similarity to Bradypodion caeruleogula (compare Figure 9). Photo by Marius Burger
FIGURE 2 in A distinctive new species of chameleon of the genus Furcifer (Squamata: Chamaeleonidae) from the Montagne d'Ambre rainforest of northern Madagascar
FIGURE 2. Drawing of the head of the male holotype of Furcifer timoni sp. nov., ZSM 2103/2007 (by Ruth Kühbandner).
FIGURE 1 in A distinctive new species of chameleon of the genus Furcifer (Squamata: Chamaeleonidae) from the Montagne d'Ambre rainforest of northern Madagascar
FIGURE 1. Male holotype of Furcifer timoni sp. nov., ZSM 2103/2007 in life, (A) lateral view, (B) dorsolateral view of head; and (C) additional male of the same species photographed near the type locality by P. Schönecker (not collected).
FIGURE 5 in A distinctive new species of chameleon of the genus Furcifer (Squamata: Chamaeleonidae) from the Montagne d'Ambre rainforest of northern Madagascar
FIGURE 5. (A) Preserved male holotype of Furcifer bifidus (MNHN 6660) in comparison to (B) preserved male holotype of Furcifer timoni sp. nov. (ZSM 2103/2007).
FIGURE 3 in A distinctive new species of chameleon of the genus Furcifer (Squamata: Chamaeleonidae) from the Montagne d'Ambre rainforest of northern Madagascar
FIGURE 3. Drawings of hemipenis of the male holotype of Furcifer timoni sp. nov., ZSM 2103/2007 (by Ruth Kühbandner): (A) asulcal view, (B) lateral view; (C) sulcal view.
FIGURE 4 in A new species of chameleon (Sauria: Chamaeleonidae) from the highlands of northwest Kenya
FIGURE 4. Phylogeny generated from Maximum Parsimony analysis, based on partial 16S and ND4 mtDNA markers. Above branches = MP bootstrap support values. Below branches = Bayesian posterior probabilities. Scale bar indicates the number of nucleotide substitutions.
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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)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
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.