asian elephants
Recently Published Documents


TOTAL DOCUMENTS

516
(FIVE YEARS 158)

H-INDEX

34
(FIVE YEARS 5)

2021 ◽  
Author(s):  
Dongwei Kang ◽  
Junqing Li
Keyword(s):  

Pathogens ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 2
Author(s):  
Ruenruetai Udonsom ◽  
Yoshifumi Nishikawa ◽  
Ragab M. Fereig ◽  
Thitirat Topisit ◽  
Natchakorn Kulkaweewut ◽  
...  

Toxoplasma gondii is the causative agent of toxoplasmosis in humans and various animal species worldwide. In Thailand, seroprevalence studies on T. gondii have focused on domestic animals, and information on infections in Asian elephants (Elephas maximus indicus) is scarce. This study was conducted to determine the seroprevalence of T. gondii infection in archival sera collected from 268 elephants living in Thailand. The serum samples were analyzed for anti-T. gondii immunoglobulin G antibodies using the latex agglutination test (LAT) and indirect enzyme-linked immunosorbent assay (iELISA) based on T. gondii lysate antigen (TLA-iELISA) and recombinant T. gondii dense granular antigen 8 protein (TgGRA8-iELISA). The prevalence of antibodies against T. gondii was 45.1% (121/268), 40.7% (109/268), and 44.4% (119/268) using LAT, TLA-iELISA, and TgGRA8-iELISA, respectively. Young elephants had a higher seropositivity rate than elephants aged >40 years (odds ratio = 6.6; p < 0.001; 95% confidence interval: 2.9–15.4). When LAT was used as the reference, TLA-iELISA and TgGRA8-iELISA showed a substantial (κ = 0.69) and moderate (κ = 0.42) agreement, respectively. Although our findings suggest the widespread exposure of Asian elephants to T. gondii in Thailand, the source of infection was not investigated. Therefore, investigation of the predisposing factors associated with toxoplasmosis is necessary to identify the potential risk factors for infection.


Author(s):  
Ranjini M. ◽  
Deepa P. M. ◽  
Vijayakumar K. ◽  
Janus A. ◽  
Karthyayini K.

Tuberculosis is known to be a disease of elephants for the past 2000 years. The main causative agent isolated from reported tuberculosis (TB) cases were Mycobacterium tuberculosis. The study focuses on the haematological and serum biochemical changes in the blood of TB infected Asian elephants (Elephas maximus). Twelve apparently healthy elephants and twelve TB infected elephants (confirmed by trunk wash smear positive for acid fast bacilli) were selected for the study. Neonates, pregnant elephants and elephants in musth were not included in the study. The study animals were subjected to haematological and serum biochemical evaluation. The data were analysed statistically. The results showed a significant increase in total leukocyte count, lymphocyte count, monocyte count, thrombocyte count and ESR in TB affected animals compared with apparently healthy animals. Serum creatinine, total bilirubin, direct bilirubin, globulin was significantly high in TB affected animals compared with healthy controls. Assessment of haematological and serum biochemical parameters in TB affected elephants aid in diagnosis and tracking of the infection


Parasitology ◽  
2021 ◽  
pp. 1-19
Author(s):  
Hla Myet Chel ◽  
Saw Bawm ◽  
Lat Lat Htun ◽  
Md. Abdul Masum ◽  
Osamu Ichii ◽  
...  

2021 ◽  
Vol 3 (1) ◽  
Author(s):  
Mia M. Keady ◽  
Natalia Prado ◽  
Haw Chuan Lim ◽  
Janine Brown ◽  
Steve Paris ◽  
...  

Abstract Background The gut microbiome is important to immune health, metabolism, and hormone regulation. Understanding host–microbiome relationships in captive animals may lead to mediating long term health issues common in captive animals. For instance, zoo managed African elephants (Loxodonta africana) and Asian elephants (Elephas maximus) experience low reproductive rates, high body condition, and gastrointestinal (GI) issues. We leveraged an extensive collection of fecal samples and health records from the Elephant Welfare Study conducted across North American zoos in 2012 to examine the link between gut microbiota and clinical health issues, reproductive hormones, and metabolic hormones in captive elephants. We quantified gut microbiomes of 69 African and 48 Asian elephants from across 50 zoos using Illumina sequencing of the 16S rRNA bacterial gene. Results Elephant species differed in microbiome structure, with African elephants having lower bacterial richness and dissimilar bacterial composition from Asian elephants. In both species, bacterial composition was strongly influenced by zoo facility. Bacterial richness was lower in African elephants with recent GI issues, and richness was positively correlated with metabolic hormone total triiodothyronine (total T3) in Asian elephants. We found species-specific associations between gut microbiome composition and hormones: Asian elephant gut microbiome composition was linked to total T3 and free thyroxine (free T4), while fecal glucocorticoid metabolites (FGM) were linked to African elephant gut microbiome composition. We identified many relationships between bacterial relative abundances and hormone concentrations, including Prevotella spp., Treponema spp., and Akkermansia spp. Conclusions We present a comprehensive assessment of relationships between the gut microbiome, host species, environment, clinical health issues, and the endocrine system in captive elephants. Our results highlight the combined significance of host species-specific regulation and environmental effects on the gut microbiome between two elephant species and across 50 zoo facilities. We provide evidence of clinical health issues, reproductive hormones, and metabolic hormones associated with the gut microbiome structure of captive elephants. Our findings establish the groundwork for future studies to investigate bacterial function or develop tools (e.g., prebiotics, probiotics, dietary manipulations) suitable for conservation and zoo management.


2021 ◽  
Author(s):  
Rob Ament ◽  
Sandeep Kumar Tiwari ◽  
Melissa Butynski ◽  
Becky Shu Chen ◽  
Norris Dodd ◽  
...  

Asian elephants are endangered across their remaining home ranges in South and Southeast Asia. According to recent estimates, fewer than 52,000 individuals remain in the wild across 13 range states. Ongoing loss and fragmentation of habitat, increasingly caused by the development and operation of linear transport infrastructure (LTI) - such as roads, railways, and highways - is now exacerbating these threats. The Asian Elephant Transport Working Group (AsETWG) began collaboration in early 2019 to focus its efforts on developing solutions for conserving core habitats and decreasing mortality and barriers to Asian elephant movement. This publication marks a first milestone in AsETWG's work. It highlights the impacts that LTI has on Asian elephants and their habitats, addresses existing frameworks for reducing elephant-transport conflicts, provides seven case studies and a focus on emerging technologies, and makes general recommendations for inspiring urgent and practical actions.


2021 ◽  
Author(s):  
Sarah L. Jacobson ◽  
Amanda Puitiza ◽  
Rebecca J. Snyder ◽  
Ashley Sheppard ◽  
Joshua M. Plotnik

PLoS ONE ◽  
2021 ◽  
Vol 16 (11) ◽  
pp. e0260284
Author(s):  
Evelyn Fuchs ◽  
Veronika C. Beeck ◽  
Anton Baotic ◽  
Angela S. Stoeger

Most studies on elephant vocal communication have focused on the low-frequency rumble, with less effort on other vocalization types such as the most characteristic elephant call, the trumpet. Yet, a better and more complete understanding of the elephant vocal system requires investigating other vocalization types and their functioning in more detail as well. We recorded adult female Asian elephants (Elephas maximus) at a private facility in Nepal and analyzed 206 trumpets from six individuals regarding their frequency, temporal and contour shape, and related acoustic parameters of the fundamental frequency. We also tested for information content regarding individuality and context. Finally, we recorded the occurrence of non-linear phenomena such as bifurcation, biphonation, subharmonics and deterministic chaos. We documented a mean fundamental frequency ± SD of 474 ± 70 Hz and a mean duration ± SD of 1.38 ± 1.46 s (Nindiv. = 6, Ncalls = 206). Our study reveals that the contour of the fundamental frequency of trumpets encodes information about individuality, but we found no evidence for trumpet subtypes in greeting versus disturbance contexts. Non-linear phenomena prevailed and varied in abundance among individuals, suggesting that irregularities in trumpets might enhance the potential for individual recognition. We propose that trumpets in adult female Asian elephants serve to convey an individual’s identity as well as to signal arousal and excitement to conspecifics.


Author(s):  
Shanelle J. Thevarajah ◽  
Taylor S. Readyhough ◽  
Maura Davis ◽  
Anneke Moresco ◽  
Sharon Joseph ◽  
...  

2021 ◽  
pp. 111629
Author(s):  
Sophie Reichert ◽  
Vérane Berger ◽  
Diogo João Franco dos Santos ◽  
Mirkka Lahdenperä ◽  
U. Kyaw Nyein ◽  
...  

Sign in / Sign up

Export Citation Format

Share Document