Drivers of in vivo bite performance in wild brown mouse lemurs and a comparison with the grey mouse lemur

2018 ◽  
Vol 305 (3) ◽  
pp. 180-187 ◽  
Author(s):  
P. B. Zablocki Thomas ◽  
C. J. Karanewsky ◽  
J. L. Pendleton ◽  
F. Aujard ◽  
E. Pouydebat ◽  
...  
Keyword(s):  
Mouse Lemur ◽  
Mouse Lemurs ◽  
Grey Mouse Lemur

scholarly journals Does the grey mouse lemur use agonistic vocalisations to recognise kin?

2018 ◽  
Vol 87 (4) ◽  
pp. 261-274 ◽  
Author(s):  
Sharon E. Kessler ◽  
Ute Radespiel ◽  
Alida I. F. Hasiniaina ◽  
Leanne T. Nash ◽  
Elke Zimmermann
Keyword(s):  
National Park ◽  
Social Dynamics ◽  
Social Complexity ◽  
Kin Recognition ◽  
Wild Mouse ◽  
Mouse Lemur ◽  
Agonistic Interactions ◽  
Playback Experiments ◽  
Mouse Lemurs ◽  
Grey Mouse Lemur

Frequent kin-biased coalitionary behaviour is a hallmark of mammalian social complexity. Furthermore, selection to understand complex social dynamics is believed to underlie the co-evolution of social complexity and large brains. Vocalisations have been shown to be an important mechanism with which large-brained mammals living in complex social groups recognise and recruit kin for coalitionary support during agonistic conflicts. We test whether kin recognition via agonistic calls occurs in a small-brained solitary foraging primate living in a dispersed social network, the grey mouse lemur (Microcebus murinus, Miller JF, 1777). As mouse lemurs are frequent models for ancestral solitary foraging mammals, this study examines whether kin recognition via agonistic calls could be the foundation from which more complex, kin-based coalitionary behaviour evolved. We test whether female wild mouse lemurs in Ankarafantsika National Park, Madagascar, react differently to agonistic calls from kin and nonkin and to calls from familiar and unfamiliar individuals during playback experiments. Subjects showed no significant differences in reactions to the different stimuli; thus they did not react differently based upon kinship or familiarity. Results suggest that this solitary foraging species does not use agonistic calls to recognise kin and monitor agonistic interactions involving kin, unlike several species of Old World monkeys and hyenas. Thus, kin recognition via agonistic calls may have evolved independently in these lineages in parallel with greater social complexity and frequent coalitionary behaviour.

Molecular liver fingerprint reflects the seasonal physiology of the grey mouse lemur (Microcebus murinus) during winter

2021 ◽  
Author(s):  
Blandine Chazarin ◽  
Margaux Benhaim-Delarbre ◽  
Charlotte Brun ◽  
Aude Anzeraey ◽  
Fabrice Bertile ◽  
...  
Keyword(s):  
Glucose Intolerance ◽  
Molecular Mechanisms ◽  
Mouse Lemur ◽  
Primate Species ◽  
Whole Body ◽  
Microcebus Murinus ◽  
Late Winter ◽  
Pathological State ◽  
Fat Reserves ◽  
Mouse Lemurs

Grey mouse lemurs (Microcebus murinus) are a primate species exhibiting strong physiological seasonality in response to environmental energetic constraint. They notably store large amounts of lipids during early winter (EW), which are thereafter mobilized during late winter (LW), when food availability is low. In addition, they develop glucose intolerance in LW only. To decipher how the hepatic mechanisms may support such metabolic flexibility, we analyzed the liver proteome of adult captive male mouse lemurs, which seasonal regulations of metabolism and reproduction are comparable to their wild counterparts, during the phases of either constitution or use of fat reserves. We highlight profound changes that reflect fat accretion in EW at the whole-body level, however, without triggering an ectopic storage of fat in the liver. Moreover, molecular regulations would be in line with the lowering of liver glucose utilization in LW, and thus with reduced tolerance to glucose. However, no major regulation was seen in insulin signaling/resistance pathways, which suggests that glucose intolerance does not reach a pathological stage. Finally, fat mobilization in LW appeared possibly linked to reactivation of the reproductive system and enhanced liver detoxification may reflect an anticipation to return to summer levels of food intake. Altogether, these results show that the physiology of mouse lemurs during winter relies on solid molecular foundations in liver processes to adapt fuel partitioning while avoiding reaching a pathological state despite large lipid fluxes. This work emphasizes how the mouse lemur is of primary interest for identifying molecular mechanisms relevant to biomedical field.

scholarly journals The effects of a national highway on the Endangered golden-brown mouse lemur Microcebus ravelobensis in Ankarafantsika National Park, Madagascar

Oryx ◽  
2017 ◽  
Vol 53 (4) ◽  
pp. 727-731 ◽  
Author(s):  
Malcolm S. Ramsay ◽  
Andriamahery Razafindrakoto ◽  
Shawn M. Lehman
Keyword(s):  
National Park ◽  
Mouse Lemur ◽  
Population Subdivision ◽  
Empirical Testing ◽  
Future Studies ◽  
North West ◽  
Mouse Lemurs ◽  
Interior Forest ◽  
Males And Females ◽  
Dispersal Events

AbstractAlthough roads are often assumed to be barriers to the dispersal of arboreal species, there has been little empirical testing of this assumption. If arboreal animals are unable to cross roads, population subdivision may occur, or resources may become inaccessible. We tested the hypothesis that Route Nationale 4 (RN4), a paved highway, was a barrier to movement and dispersal of the Endangered golden-brown mouse lemur Microcebus ravelobensis in Ankarafantsika National Park, in north-west Madagascar. During June–August 2015 we conducted a capture–mark–recapture study at three sites: two adjacent to RN4 and one within intact forest without a potential barrier. During 2,294 trap nights we captured 120 golden-brown mouse lemurs 1,032 times. In roadside habitats we captured significantly more males than females, whereas the opposite was the case in interior forest habitat. We detected eighteen crossings of highway transects by nine individuals; however, all potential dispersal events involved males. In roadside habitat, movement was significantly inhibited in both males and females. We present some of the first data on the effects of roads on movement patterns in arboreal Malagasy mammals, showing species- and sex-biased effects of roads as dispersal barriers. Our findings indicate that roads may not be complete barriers to dispersal in lemurs. We recommend that conservation managers and scientists examine explicitly the effects of roads and natural arboreal bridges in Madagascar in future studies.

scholarly journals RADseq data reveal a lack of admixture in a mouse lemur contact zone contrary to previous microsatellite results

2021 ◽  
Author(s):  
Jelmer Wijtze Poelstra ◽  
B. Karina Montero ◽  
Jan Lüdemann ◽  
Ziheng Yang ◽  
S. Jacques Rakotondranary ◽  
...  
Keyword(s):  
Gene Flow ◽  
Contact Zone ◽  
Mouse Lemur ◽  
Biological Processes ◽  
Microsatellite Data ◽  
Ancestral Gene ◽  
Mouse Lemurs ◽  
Low Levels ◽  
Future Work ◽  
Lemur Species

Despite being one of the most fundamental biological processes, the process of speciation remains poorly understood in many groups of organisms. Mouse lemurs are a species-rich genus of small primates endemic to Madagascar, whose diversity has only recently been uncovered using genetic data and is primarily found among morphologically cryptic, allopatric populations. To assess to what extent described species represent reproductively isolated entities, studies are needed in areas where mouse lemur taxa come into contact. Hybridization has previously been reported in a contact zone between two closely related mouse lemur species (Microcebus murinus and M. griseorufus) based on microsatellite data. Here, we revisit this system using RADseq data for populations in, near, and far from the contact zone, including many of the individuals that had previously been identified as hybrids. Surprisingly, we find no evidence for admixed nuclear ancestry in any of the individuals. Re-analyses of microsatellite data and simulations suggest that previously inferred hybrids were false positives and that the program NewHybrids can be particularly sensitive to erroneously inferring hybrid ancestry. Using coalescent-bases analyses, we also show an overall lack of recent gene flow between the two species, and low levels of ancestral gene flow. Combined with evidence for local syntopic occurrence, these data indicate that M. murinus and M. griseorufus are reproductively isolated. Finally, we estimate that they diverged less than a million years ago, suggesting that completion of speciation is relatively rapid in mouse lemurs. Future work should focus on the underpinnings of reproductive isolation in this cryptic primate radiation, which are mostly unknown. Our study also provides a cautionary tale for the inference of hybridization with microsatellite data.

Food acquisition on arboreal substrates by the grey mouse lemur: implication for primate grasping evolution

2013 ◽  
Vol 291 (4) ◽  
pp. 235-242 ◽  
Author(s):  
S. Toussaint ◽  
E. Reghem ◽  
H. Chotard ◽  
A. Herrel ◽  
C. F. Ross ◽  
...  
Keyword(s):  
Mouse Lemur ◽  
Food Acquisition ◽  
Grey Mouse Lemur

P2-468: In vivo follow-up of cerebral aging and side effects of anti-amyloid immunotherapies in the mouse lemur primate

2011 ◽  
Vol 7 ◽  
pp. S462-S463
Author(s):  
Nelly Joseph-Mathurin ◽  
Olène Dorieux ◽  
Audrey Kraska ◽  
Mathieu Santin ◽  
Stéphanie Trouche ◽  
...  
Keyword(s):  
Side Effects ◽  
Mouse Lemur

Enter the Matrix: Use of Secondary Matrix by Mouse Lemurs

2020 ◽  
pp. 1-11
Author(s):  
Travis S. Steffens ◽  
Malcolm S. Ramsay ◽  
Bertrand Andriatsitohaina ◽  
Ute Radespiel ◽  
Shawn M. Lehman
Keyword(s):  
Relative Abundance ◽  
Mouse Lemur ◽  
Primate Species ◽  
Forest Loss ◽  
Fragmented Landscape ◽  
Forest Fragments ◽  
Matrix Elements ◽  
Fragmented Forest ◽  
Mouse Lemurs ◽  
The Matrix

Madagascar is home to many threatened and endemic primate species, yet this island has seen dramatic declines in lemur habitat due to forest loss. This forest loss has resulted in an increasingly fragmented forest landscape, with fragments isolated from each other by grasslands (i.e., matrix). The grassland matrix is not entirely homogeneous containing matrix elements such as isolated trees and shrubs and linear features such as drainage lines. Because most lemurs are predominantly arboreal, they may preferentially use matrix elements to facilitate dispersal between fragments for access to mates or reduce feeding competition, allowing gene flow between fragments of habitat. Therefore, it is important to understand to what degree they use the matrix. We investigated matrix use in two mouse lemurs, the grey mouse lemur (<i>Microcebus murinus</i>) and the golden-brown mouse lemur (<i>Microcebus ravelobensis</i>) in a fragmented landscape in northwest Madagascar. We tested the predictions that: (1) lemurs use matrix less often than forest fragments, (2) if they use the matrix, then they will preferentially use matrix elements compared to grassland, and (3) <i>M. murinus</i> will disperse into the matrix further than <i>M. ravelobensis</i>. In 2011, we visually surveyed line transects in four areas containing matrix elements and four adjacent forest fragments during nocturnal walks. In 2017, we set up traplines in four areas of the matrix containing matrix elements, three areas that were grassland, and six traplines in adjacent fragments. We compared the relative abundance of mouse lemurs in matrix transects to fragmented forest transects, and the relative abundance of captured lemurs in matrix elements, grassland, and fragment traplines. We found that encounter rates of mouse lemurs did not significantly differ between the matrix and fragmented forest transects or traplines. Our sample size was too low to determine if the mean distance from the forest was greater for either <i>Microcebus</i> spp. Our study highlights that mouse lemurs do use matrix elements and there may be interspecific differences in use. Further research is needed to confirm species-specific matrix use, why mouse lemurs use matrix, and how much matrix elements facilitate movement for each species in fragmented landscapes.

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