Find research datasets worth reusing
Search datasets from major research repositories and use ShareScore to quickly assess how well each record supports discovery, access, and reuse.
17
datasets available to search
ShareScore release 0.7.1
Dataset results
17 results for “Nectomys”
Does stress mess with rodents' heads? Influence of habitat availability and genetic factors in mandible fluctuating asymmetry (FA) in South American water rats (Nectomys squamipes, Sigmodontinae) from Brazilian Atlantic rainforest remnants
<p>Loss of developmental stability can lead to deviations from bilateral symmetry (i.e. Fluctuating Asymmetry -FA), and is thought to be caused by environmental and genetic factors associated with habitat loss and stress. Therefore, levels of FA might be a valuable tool to monitor wild populations if FA serves an indicator of exposure to stress due to impacts of habitat loss and fragmentation. In studies examining FA and habitat fragmentation, FA levels are often explained by loss of genetic variation, though few studies have addressed FA's use as indicator of environmental impact. Here we investigated whether habitat loss, genetic variation and/or inbreeding affect the developmental instability in Brazilian Atlantic rainforest populations of a Neotropical water rat (Nectomys squamipes). We sampled individuals from eight forest remnants with different amounts of available habitat and assessed FA levels with geometric morphometric techniques using adult mandibles. We used observed heterozygosity (Ho) and inbreeding coefficient (Fis), from seven microsatellite markers, as a proxy of genetic variation at individual and population levels. Populations were not significantly different for shape or size FA levels. Furthermore inter-individual variation in both shape and size FA levels, as well as inter-populational differences in size FA levels, were best explained by chance. However, habitat availability was negatively associated with both inter-populational variance and average shape FA levels. This association was stronger in populations living in areas with less than 20% of habitat available, which presented higher variance and higher average of FA, suggesting that Nectomys squamipes might have a tolerance threshold to small availability of habitat. Our work was one of the first to use FA to address environmental stress caused by reduced habitat availability in small mammal populations from a Neotropical biome. We suggest that shape FA might serve as a conservation tool to monitor human impact on natural animal populations.</p>
On following pages: 462. Gray Rice Rat (Eremoryzomys polius); 463. Medium-tailed Rice Rat (Eremoryzomys mesocaudis Brazilian False Rice Rat (Pseudoryzomys simplex); 467. Venezuelan Marsh Rat (Holochilus venezuelae); 468. Amazonian (Holochilus brasiliensis); 471. Crafty Marsh Rat (Holochilus vulpinus); 472. Lagiglia's Marsh Rat (Holochilus lagiglia Rat (Cerradomys maracajuensis); 476. Lindbergh's Rice Rat (Cerradomys scott); 477. Akroa Rice Rat (Cerradomys Goytaca Rice Rat (Cerradomys goytaca); 481. Ucayali Water Rat (Amphinectomys savamis); 482. Trinidad Water Rat Rat (Nectomys apicalis); 485. South American Water Rat (Nectomys rattus); 486. Atlantic Water Rat (Nectomys squamipes), 464. Lund''s Water Rat (Lundomys molitor); 465. Paraguayan Rice Rat (Sooretamys angouya); 466. Marsh Rat (Holochilus sciureus); 469. Chacoan Marsh Rat (Holochilus chacarius); 470. Brazilian Marsh Rat); 473. Langguth's Rice Rat (Cerradomys langguthi); 474. Vivo's Rice Rat (Cerradomys vivoi); 475. Maracaju Rice akroal); 478. Marinho's Rice Rat (Cerradomys marinhus); 479. Terraced Rice Rat (Cerradomys subflavus); 480. (Nectomys palmipes); 483. Magdalena Water Rat (Nectomys magdalenae); 484. Western Amazonian Water ). in Cricetidae
On following pages: 462. Gray Rice Rat (Eremoryzomys polius); 463. Medium-tailed Rice Rat (Eremoryzomys mesocaudis Brazilian False Rice Rat (Pseudoryzomys simplex); 467. Venezuelan Marsh Rat (Holochilus venezuelae); 468. Amazonian (Holochilus brasiliensis); 471. Crafty Marsh Rat (Holochilus vulpinus); 472. Lagiglia's Marsh Rat (Holochilus lagiglia Rat (Cerradomys maracajuensis); 476. Lindbergh's Rice Rat (Cerradomys scott); 477. Akroa Rice Rat (Cerradomys Goytaca Rice Rat (Cerradomys goytaca); 481. Ucayali Water Rat (Amphinectomys savamis); 482. Trinidad Water Rat Rat (Nectomys apicalis); 485. South American Water Rat (Nectomys rattus); 486. Atlantic Water Rat (Nectomys squamipes), 464. Lund''s Water Rat (Lundomys molitor); 465. Paraguayan Rice Rat (Sooretamys angouya); 466. Marsh Rat (Holochilus sciureus); 469. Chacoan Marsh Rat (Holochilus chacarius); 470. Brazilian Marsh Rat); 473. Langguth's Rice Rat (Cerradomys langguthi); 474. Vivo's Rice Rat (Cerradomys vivoi); 475. Maracaju Rice akroal); 478. Marinho's Rice Rat (Cerradomys marinhus); 479. Terraced Rice Rat (Cerradomys subflavus); 480. (Nectomys palmipes); 483. Magdalena Water Rat (Nectomys magdalenae); 484. Western Amazonian Water ).
FIGURE 8 in The taxonomic status of Nectomys saturatus Thomas, 1897 (Cricetidae: Sigmodontinae)
FIGURE 8. The occlusal view of the upper and lower molar rows of Nectomys saturatus paratype BMNH 3.1.8.3. The bar represents 2 mm.
FIGURE 7 in The taxonomic status of Nectomys saturatus Thomas, 1897 (Cricetidae: Sigmodontinae)
FIGURE 7. The skull of Nectomys saturatus. Dorsal, ventral, and lateral views of the skull and lateral view of the mandible N. saturatus holotype BMNH 97.11.7.40. Courtesy of the Trustees of the Natural History Museum, London. The bar represents 10 mm.
FIGURE 3 in The taxonomic status of Nectomys saturatus Thomas, 1897 (Cricetidae: Sigmodontinae)
FIGURE 3. Bar chart showing the frequency of the characters states of the six informative morphological traits. In the x axes are the species and in the y axes are the absolute frequency of characters states. Each chart (a–f) represents one character where the numbers represent the character states. A, size of mystacial vibrissae; 1, mystacial vibrissae reaches the base of the ear; 2, mystacial vibrissae surpass the base of the ear, but do not reach the top of pinnae; 3, mystacial vibrissae surpass the pinnae top. B, color of ungual tufts; 1, ungual tufts dark brown; 2, ungual tufts dark colored in the base and white in the top; 3, ungual tufts white. C, presence and size of hypothenar pad of pes; 1, hypothenar pad present, small and fleshy; 2, hypothenar pad of pes absent; 3, hypothenar pad of pes small, not fleshy. D, color of ventral keel of hair on ventral surface of the tail; 1, keel dark brown-haired; 2, keel white-haired; 3, keel white-haired at a half to two-thirds apical part of the tail; 4, keel white-haired at a quarter to one-third apical part of the tail; 5, keel entire mixed with dark brown and white hairs; 6, keel mixed with dark brown and white hairs at one-third apical part. E, shape of interorbital region; 1, interorbital region strongly convergent posteroanteriorly; 2, interorbital region with supraorbital margin tending to be parallel. F, presence of paralophule on M1; 1, paralophule absent; 2, paralophule present.
FIGURE 5 in The taxonomic status of Nectomys saturatus Thomas, 1897 (Cricetidae: Sigmodontinae)
FIGURE 5. Upper molars. Occlusal view of upper molars showing the presence of paralophule at M1 of Nectomys saturatus (BMNH 3.1.8.3, arrow in the left panel), and the absence of this character in N. rattus (NMW B471, right panel). The bars represent 5 mm.
FIGURE 2 in The taxonomic status of Nectomys saturatus Thomas, 1897 (Cricetidae: Sigmodontinae)
FIGURE 2. Scatter plot of the individual scores obtained from the first two discriminant functions of Discriminant Analysis: axis x, first discriminant function (DF1) represents 52.3% of variance; axis y, second discriminant function (DF2) represents 26.1% of variation.
FIGURE 1 in The taxonomic status of Nectomys saturatus Thomas, 1897 (Cricetidae: Sigmodontinae)
FIGURE 1. Location of Nectomys specimens employed in this study. Countries acronyms: ARG, Argentina; BRA, Brazil; COL, Colombia; ECU, Ecuador; FGU, French Guiana; GUY, Guyana; PER, Peru; SUR, Suriname; TRI, Trinidad and Tobago; VEN, Venezuela.
FIGURE 4 in The taxonomic status of Nectomys saturatus Thomas, 1897 (Cricetidae: Sigmodontinae)
FIGURE 4. Interorbital region. Dorsal view of the skull showing the different shapes of interorbital region. Upper panel, interorbital region strongly convergent, Nectomys apicalis (AMNH 71909). Lower panel, interorbital with supraorbital margins almost parallel sided, N. saturatus (BMNH 3.1.8.3). The bars represent 5 mm.
Figure 1 in Predation of the black-eared opossum (Didelphis aurita) on the great kiskadee (Pitangus sulphuratus) and the water rat (Nectomys squamipes)
Figure 1: Predation of Pitangus sulphuratus by Didelphis aurita at the Institute of Biodiversity and Sustainability, Macaé, Rio de Janeiro, Brazil. (A) A young individual of P. sulphuratus sleeps on a top of a box on the ground. (B) D. aurita appears in the video in a sinuous way being guided by smell. (C) The opossum moves behind the young P. sulphuratus, which shows no reaction. (D) D. aurita walks towards the P. sulphuratus individual. (E) D. aurita attacks young P. sulphuratus by grabbing it with its front limbs. (F) The opossum makes a fatal bite on the bird.
Does stress mess with rodents’ heads? Influence of habitat availability and genetic factors in mandible fluctuating asymmetry (FA) in South American water rats (Nectomys squamipes, Sigmodontinae) from Brazilian Atlantic rainforest remnants
Open the record for dataset details and reuse information.
Figure 4 in Spatial patterns of the semi-aquatic rodent Nectomys squamipes in Atlantic forest streams
Figure 4. Linear regressions between body weight (g) and home length (m) for 29 individuals of Nectomys squamipes analysed through capture–mark–recapture (CMR). Black circles represent males and grey circles represent females. The top line represents the linear regression for males, while the bottom and dotted line represents the linear regression for females. The regression equations are presented on the figure. HL = home length; BWeight = body weight.
Figure 2 in Spatial patterns of the semi-aquatic rodent Nectomys squamipes in Atlantic forest streams
Figure 2. Geometric regression curve between river/tributary width (m) and Nectomys squamipes trapping success (%). The regression equation is presented on the figure. TS = trapping success.
Figure 1 in Spatial patterns of the semi-aquatic rodent Nectomys squamipes in Atlantic forest streams
Figure 1. Study area, in Rio de Janeiro state, Brazil. Tg 1 and Tg 2 are tributaries of Águas Claras River; Tf 1 and Tf 2 are tributaries of Floresta River.
Figure 3 in Spatial patterns of the semi-aquatic rodent Nectomys squamipes in Atlantic forest streams
Figure 3. Home length and home range (MCP) for four males (R-M) and one female (R-F) of Nectomys squamipes monitored through radio tracking and capture–mark–recapture.
Figure 5 in Spatial patterns of the semi-aquatic rodent Nectomys squamipes in Atlantic forest streams
Figure 5. Box plots of distance between successive captures (DSC) for 64 individuals of Nectomys squamipes studied using capture–mark–recapture (CMR). (a) Males' DSC between seasons; (b) females' DSCs between seasons. The middle line on boxes represents the median; the bottom and top of the boxes represent the first and the third quartiles; the whiskers extend to no more than 1.5 times the interquartile range from the boxes or to the extreme data point. Numbers in parentheses are the sample sizes for each sample group.
FIGURE 6 in The taxonomic status of Nectomys saturatus Thomas, 1897 (Cricetidae: Sigmodontinae)
FIGURE 6. The skin of Nectomys saturatus. Dorsal, ventral and lateral view of the skin of N. saturatus holotype BMNH 97.11.7.40. Courtesy of the Trustees of the Natural History Museum, London. The bar represents 100 mm.
ScienceDex guides
Understand access before you commit
These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
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.