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Lehtonen, Jukka T.; Mustonen, Olli; Ramiarinjanahary, Haingotiana; Niemelä, Jari; Rita, Hannu

doi:10.1023/a:1016687608020

Cited by 32 publications

(7 citation statements)

References 9 publications

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“…It is located in southeastern Madagascar ( Figure S1; 47°18′-47°37′E, 21°02′-21°25′S) and covers 43,500 ha of mid-elevation rain forest at elevations ranging from 400 to 1,400 m a. s. l. The average annual rainfall in Ranomafana area is 2,300-4,000 mm, the heaviest rains taking place in December-March. Average monthly temperatures vary between 15 and 24°C (Lehtonen, Mustonen, Ramiarinjanahary, Niemelä, & Rita, 2001). Ranomafana National Park harbors a rich community of mammals, including 13 species of lemurs (Wright et al, 2012).…”

Section: Study Areamentioning

confidence: 99%

“…Certain species of lemurs are known to be able to survive in fragments and degraded habitats between Ranomafana and Vatovavy, although in reduced numbers (Dehgan, 2003;Holmes et al, 2015). In addition to lemurs, selectively logged forests support diverse communities of native rodents whereas introduced Rattus rattus is spreading in open and anthropogenic landscapes (Lehtonen et al, 2001).…”

Section: Study Areamentioning

confidence: 99%

“…In addition to higher level of generalism among Malagasy dung beetles, new introduced resources in degraded forests may facilitate their persistence. One such resource could be the dung of the introduced Rattus rattus which has been reported to increase in anthropogenic landscapes (Lehtonen et al, 2001). It is improbable that rat dung would support very large-bodied dung beetles, but it might be suitable for smaller species, and rat as carrion would be suitable also for larger species.…”

Section: Ta B L Ementioning

confidence: 99%

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Unexpectedly diverse forest dung beetle communities in degraded rain forest landscapes in Madagascar

2020

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Tropical forests, which harbor high levels of biodiversity, are being lost at an alarming speed. Madagascar, a biodiversity hotspot, has lost more than half of its original forest cover. Most of the remaining forests are small fragments of primary and secondary forest with differing degrees of human impact. These forests, as well as coffee and fruit plantations, may be important in supporting the forest‐dependent biodiversity in Madagascar but this has been little studied. In Madagascar, dung beetles, which offer important ecosystem services, are largely restricted to forests. We examined the ability of fragmented and degraded forests to support dung beetle diversity, compared to the large areas of primary forest in eastern Madagascar. We found a general trend of a reduction of species with a loss of forest connectivity. In contrast, a higher level of forest disturbance was associated with higher species diversity. In several sites of low‐quality forest as many or more species were found as in less disturbed and primary forests. The average size of dung beetles was smaller in the lower quality localities than in the primary forests. These findings suggest that many forest dung beetles in Madagascar are better adapted to forest disturbance than earlier expected, although they require some level of connectivity to surrounding forest. Abstract in Malagasy is available with online material.

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Section: Study Areamentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%

Section: Ta B L Ementioning

confidence: 99%

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Unexpectedly diverse forest dung beetle communities in degraded rain forest landscapes in Madagascar

2020

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“…These environmental variables were selected because they were previously shown to potentially influence small-mammal species abundance (Ford et al 1997;Malcolm and Ray 2000;Lehtonen et al 2001;Schmid-Holmes and Drickamer 2001;Shanker 2001;Lambert et al 2003;Greenberg et al 2007). …”

Section: Environmental Characteristicsmentioning

confidence: 99%

Shrew species diversity and abundance in Ziama Biosphere Reserve, Guinea: comparison among primary forest, degraded forest and restoration plots

et al. 2009

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The aim of our study was to compare the shrew community diversity and structure in gradients of tropical forest degradation and restoration. Four plots within each of six habitats of the Ziama Biosphere Reserve were surveyed, including primary forest, secondary forest, cultivated fields, recently (less than 3 years) abandoned fields, young (10-12 years) forest restoration plots, and old (34 years) restoration plots. From August to November 2003, we pitfall-trapped 2,509 shrews representing 11 species. Shrew species richness and composition was similar in the six habitat surveyed, while shrew species abundance varied between habitats. Canopy height and cover, density of stems and trees and understorey density were shown to constitute important parameters influencing the abundance of several shrew species. After clear-cutting, restoration of key attributes of the forest vegetation structure was possible in 10-34 years, either by natural regeneration or by planting of seedlings. The relative abundance of most shrew species was similar between restoring forest (i.e., young restoration plots or fallows) and primary forest. Considering the advantages and disadvantages of these two methods of forest restoration, one of the most suitable management practices to restore forest while preserving shrew biodiversity could be to perform an alternation of native seedling plantation lines and fallows.

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“…The city of Antananarivo expends considerable effort in removing it annually from Lake Anosy (Binggeli 2003d). As far as animals go, we might highlight the impact of Rattus rattus (black rats), which arrived with early humans and spread in disturbed habitats around the island associated with human settlements, and which have serious consequences in terms of spreading diseases, threatening food stocks, and even eating rice in the rice fields (Lehtonen et al 2001, Tollenaere et al 2010. Likewise, the recent spread of Procambarus 'Marmorkrebs' (marbled crayfish) in rivers close to Antananarivo is thought to threaten rice production (Jones et al 2009, Kawai et al 2009 (Masuda et al 1984, Sparks andStiassny 2003).…”

Section: Origin: Native or Not Native To Madagascar?mentioning

confidence: 99%

Approaching invasive species in Madagascar

Kull¹,

Tassin²,

Carrière³

2015

MCD

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Contrairement à la plupart des autres îles, et en dépit du qualificatif 'invasif' rattaché depuis longtemps à certaines espèces qui s'y sont naturalisées, les réflexions autour de l'approche des espèces invasives à Madagascar demeurent récentes. L'opuntia (Opuntia spp.) figure certes parmi les plus anciens exemples d'espèces traités dans la littérature sur les invasions biologiques. Mais ce n'est vraiment qu'avec le retentissement médiatique autour de la détection en 2011 de la présence du crapaud masqué (Duttaphrynus melanostictus) et la recherche d'une parade appropriée que s'est affirmée la nécessité de traiter cette question des espèces invasives en tant que telle. Une posture nativiste et uniforme qui ignorerait la spécificité des contextes biophysiques et socio - économiques locaux, mais aussi la pluralité des formes d'invasion biologique et des définitions qui s'y rattachent, ne saurait être privilégiée. L'article montre qu'il s'agit de situer les réflexions dans un contexte insulaire socio - économique dans lequel les espèces allogènes tiennent depuis longtemps une large place. Il défend en outre la nécessité d'envisager les espèces invasives non pas selon une forme de perception unique et autoritariste, mais selon une diversité de points de vue, conforme aux conflits d'intérêts qui se manifestent parfois, et mettant plutôt en avant le caractère exogène des espèces invasives, leurs effets (négatifs, mais aussi positifs) sur le milieu, ou leur mode de fonctionnement (dispersion, dominance) dans des contextes spécifiques et locaux. Il convient en particulier d'observer qu'aux coûts générés par les invasions biologiques peuvent s'ajouter des bénéfices économiques, et que les impacts écologiques néfastes peuvent se combiner avec des incidences heureuses, y compris auprès d'espèces indigènes en situation critique. En outre, le point de vue des populations humaines, leur connaissance d'espèces invasives quotidiennement rencontrées, leur réticence à scinder le vivant en espèces indigènes et allogène, mais aussi leur vision pragmatique, ne sauraient être mésestimés, et moins encore oubliés. Enfin, l'article invite à prendre du recul face aux effets rhétoriques liés aux discours conventionnels sur les invasions biologiques, à éviter les amalgames et les généralisations excessives, à tenir compte des contraintes environnementales mais aussi des aspirations socio - économiques des populations locales, et à prendre en compte la diversité des spécificités locales, qu'elles soient biophysiques ou sociales. En conclusion, il est sans doute heureux que Madagascar n'ait rejoint que très récemment la mouvance internationale des réflexions sur les espèces invasives : cela lui permet en effet d'être en mesure de disposer d'une position équilibrée, déjouant certains discours catastrophistes, et préférant une approche résolument contextualisée, à l'échelle nationale comme aux échelles régionales. (Résumé d'auteur

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Untitled

Cited by 32 publications

References 9 publications

Unexpectedly diverse forest dung beetle communities in degraded rain forest landscapes in Madagascar

Unexpectedly diverse forest dung beetle communities in degraded rain forest landscapes in Madagascar

Shrew species diversity and abundance in Ziama Biosphere Reserve, Guinea: comparison among primary forest, degraded forest and restoration plots

Approaching invasive species in Madagascar

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