Gastrointestinal parasite infection of the Gray mouse lemur (&lt;i&gt;Microcebus murinus&lt;/i&gt;) in the littoral forest of Mandena, Madagascar: Effects of forest fragmentation and degradation

Raharivololona, Brigitte M.; Ganzhorn, Jörg U.

doi:10.4314/mcd.v4i2.48650

Cited by 27 publications

(45 citation statements)

References 73 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The intensity of infection was defined as the number of eggs, larvae, and cysts found in 1 g of feces (fecal egg count, FEC). This definition deviates from the generally accepted term that includes only eggs, and was used to be consistent with our previous papers (Raharivololona 2007, 2009, Raharivololona & Ganzhorn 2009) in which we defined FEC as the number of eggs and larvae found in 1 g of feces of 1 ind. This value is obtained by multiplying the number of eggs, larvae, and cysts counted in the 2 chambers of a McMaster cell by 50 (Euzéby 1981).…”

Section: Methodsmentioning

confidence: 99%

“…Food passage time was investigated using markers and determined to be < 24 h in all cases. Therefore, all parasites found in the feces of these animals after the second night were assumed to be genuine parasites of M. murinus and not temporary parasites from prey or accidental infections (Raharivololona 2009, Raharivololona & Ganzhorn 2009). While these precautions might help to separate true from accidental gastrointestinal parasites, we do not have sufficient information yet to know which of the parasites found in the feces of lemurs are of clinical significance (Junge & Louis 2007.…”

Section: Methodsmentioning

confidence: 99%

“…In addition, months were pooled and assigned to different seasons: (1) hot season (April, May, September to December) and cold season (June to August); (2) wet season (April to August, December) and dry season (September to November). For these analyses, we used data only from the fragment M15/M16 because parasite infections differ between fragments of different size and degree of degradation (Raharivololona & Ganzhorn 2009). We used non-parametric tests (chisquared, Mann-Whitney U, and Kruskal-Wallis analysis of variance, Spearman rank correlation) for these analyses.…”

Section: Methodsmentioning

confidence: 99%

“…In large forests, degradation of the forest was linked to higher parasite loads. This situation was reversed in small forest fragments (Raharivololona & Ganzhorn 2009). N. Schwitzer et al (unpubl.…”

Section: Seasonal Variations In Gastrointestinal Parasites Excreted Bmentioning

confidence: 98%

“…Junge & Louis 2002, 2005, 2007, Dutton et al 2003, 2008, Schad et al 2004, 2005, Junge & Sauther 2006, Raharivololona et al 2007, Schwensow et al 2007, Raharivololona & Ganzhorn 2009, Wright et al 2009. In studies on Microcebus murinus in the littoral forest, lemurs from smaller fragments were parasitized to a higher degree than animals from larger forest fragments.…”

Section: Seasonal Variations In Gastrointestinal Parasites Excreted Bmentioning

confidence: 99%

See 4 more Smart Citations

Seasonal variations in gastrointestinal parasites excreted by the gray mouse lemur Microcebus murinus in Madagascar

Raharivololona¹,

Ganzhorn²

2010

Endang. Species. Res.

Self Cite

View full text Add to dashboard Cite

We describe seasonal variations in gastrointestinal parasites found in feces of the gray mouse lemur Microcebus murinus. Our study was carried out in the evergreen littoral forest of Mandena, Madagascar. Fecal samples from M. murinus caught during monthly trapping sessions were screened for eggs and larvae of intestinal parasites. Gastrointestinal parasite infection of M. murinus was characterized by parasite species richness, the prevalence of parasites, and the intensity of infection expressed as the number of parasite eggs, larvae, and cysts per g feces. We used a modification of the McMaster flotation egg counting technique to quantify parasite egg shedding. Parasite excretions changed seasonally when analyzed on the level of individual hosts. The number of parasite species and the abundance of parasite eggs and larvae in Microcebus feces were higher during the hot season than during the cold season. Reduced parasite excretion during the cold season could be due to environmental factors or to the ability of M. murinus to enter torpor and hibernation during the cold season, which might lead to reduced metabolism of intestinal parasites and might thus result in reduced shedding of eggs. No such variation was found when the analyses were based on samples of unknown origin.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Seasonal Variations In Gastrointestinal Parasites Excreted Bmentioning

confidence: 98%

Section: Seasonal Variations In Gastrointestinal Parasites Excreted Bmentioning

confidence: 99%

See 3 more Smart Citations

Seasonal variations in gastrointestinal parasites excreted by the gray mouse lemur Microcebus murinus in Madagascar

Raharivololona¹,

Ganzhorn²

2010

Endang. Species. Res.

Self Cite

View full text Add to dashboard Cite

show abstract

Effects of anthropogenic disturbance on indri (Indri indri) health in Madagascar

Junge

Barrett

Yoder

2011

American J Primatol

View full text Add to dashboard Cite

Anthropogenic habitat disturbance impairs ecosystem health by fragmenting forested areas, introducing environmental contamination, and reducing the quality of habitat resources. The effect of this disturbance on wildlife health is of particular concern in Madagascar, one of the world's biodiversity hotspots, where anthropogenic pressures on the environment remain high. Despite the conservation importance of threatened lemur populations in Madagascar, few data exist on the effects of anthropogenic disturbance on lemur health. To examine these impacts, indri (Indri indri) populations were evaluated from two forest reserves that differ in their exposure to anthropogenic disturbance. We compared the health status of 36 indri individuals from two sites: one population from a protected, undisturbed area of lowland evergreen humid forest and the other population from a reserve exposed to frequent tourism and forest degradation. Comparison of indri health parameters between sites suggests an impact of anthropogenic disturbance, including significant differences in leukocyte count and differential, 12 serum parameters, 6 trace minerals, and a higher diversity of parasites, with a significant difference in the presence of the louse, Trichophilopterus babakotophilus. These data suggest that indri living in disturbed forests may experience physiological changes and increased susceptibility to parasitism, which may ultimately impair reproductive success and survival.

show abstract

Trends in forest fragment research in Madagascar: Documented responses by lemurs and other taxa

Kling

Yaeger

Wright

2020

American J Primatol

View full text Add to dashboard Cite

The rise in research investigating fragmentation and its impact on primates and other taxa reflects the growing presence of fragmented landscapes themselves. Although numerous studies report the negative effects of fragmentation on biodiversity, it is difficult to generalize responses to fragmentation for specific taxonomic groups, such as non-human primates, when studies have not employed a definitive concept of fragmentation or fragments themselves. Madagascar's high degree of fragmentation, wealth of endemic taxa, and extensive history of ecological research provide the opportunity to compare fragmentation studies across similar contexts. We conducted a literature search of peer-reviewed articles on fragmentation in Madagascar to characterize its trends. A total of 70 articles, 46 of which concentrated on lemurs, tested the impacts of fragmentation on Malagasy taxa, while additional sources conducted research in one or more fragments without testing its effects (n = 112 total, 79 on lemurs). Studies on lemurs most frequently tested fragmentation's impacts on genetics and biodiversity metrics (n = 16 and 15 studies, respectively), although health, modeling, behavioral, and cross-disciplinary techniques were also reported. Responses to fragmentation were reported for 49 lemur species, with most studies concentrated in eastern Madagascar (87%). Although there was variation in the metrics reported in studies testing the effects of fragmentation on Malagasy species, the most common measures were fragment area, isolation, or comparison to a control site. Landscape-scale approaches and examination of fragmentation per se were rarely employed. Characterizing trends of fragmentation research in Madagascar emphasizes the challenges of documenting fragmentation's effects while highlighting the benefits of research within fragmented landscapes, particularly when combined with consideration for how the matrix within human-modified landscapes may impact primate populations. K E Y W O R D S forest fragments, fragmentation, lemurs, literature search, Madagascar

show abstract

Gastrointestinal parasite infection of the Gray mouse lemur (<i>Microcebus murinus</i>) in the littoral forest of Mandena, Madagascar: Effects of forest fragmentation and degradation

Cited by 27 publications

References 73 publications

Seasonal variations in gastrointestinal parasites excreted by the gray mouse lemur Microcebus murinus in Madagascar

Seasonal variations in gastrointestinal parasites excreted by the gray mouse lemur Microcebus murinus in Madagascar

Effects of anthropogenic disturbance on indri (Indri indri) health in Madagascar

Trends in forest fragment research in Madagascar: Documented responses by lemurs and other taxa

Contact Info

Product

Resources

About