Le nouvel horizon sénégalais

Lombard, Jérôme; Sakho, Papa; Bolten, Catherine E.

doi:10.3917/eg.484.0306

Cited by 3 publications

(2 citation statements)

References 9 publications

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“…The processes at work in complex commensal environments such as those found in large cities may be different, and the outcome of the interactions may not systematically benefit the larger species (here the black rat). Instead, the house mouse may well be favoured in urbanized environments such as those that are developing in sub‐Saharan Africa, as exemplified by the situation observed in Dakar (Stragier et al, 2020 ), and in most of the cities from the western part of Senegal North of the Gambia, that is, the area which has benefitted from the groundnut trade for its early and accelerated development since the 1960s (Lombard et al, 2020 ). In such habitats, the small size of the house mouse could represent a real advantage to (i) better hide from predators (including humans), (ii) more easily slip into well‐protected buildings and rooms and (iii) subsist on less abundant food resources.…”

Section: Discussionmentioning

confidence: 99%

Sharing space between native and invasive small mammals: Study of commensal communities in Senegal

Granjon,

Artige,

Bâ

et al. 2023

Ecology and Evolution

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Urbanization processes are taking place at a very high rate, especially in Africa. At the same time, a number of small mammal species, be they native or invasive, take advantage of human‐induced habitat modifications. They represent commensal communities of organisms that cause a number of inconveniences to humans, including potential reservoirs of zoonotic diseases. We studied via live trapping and habitat characterization such commensal small mammal communities in small villages to large cities of Senegal, to try to understand how the species share this particular space. Seven major species were recorded, with exotic invasive house mice (Mus musculus) and black rats (Rattus rattus) dominating in numbers. The shrew Crocidura olivieri appeared as the main and more widespread native species, while native rodent species (Mastomys natalensis, M. erythroleucus, Arvicanthis niloticus and Praomys daltoni) were less abundant and/or more localized. Habitat preferences, compared between species in terms of room types and characteristics, showed differences among house mice, black rats and M. natalensis especially. Niche (habitat component) breadth and overlap were measured. Among invasive species, the house mouse showed a larger niche breadth than the black rat, and overall, all species displayed high overlap values. Co‐occurrence patterns were studied at the global and local scales. The latter show cases of aggregation (between the black rat and native species, for instance) and of segregation (as between the house mouse and the black rat in Tambacounda, or between the black rat and M. natalensis in Kédougou). While updating information on commensal small mammal distribution in Senegal, a country submitted to a dynamic process of invasion by the black rat and the house mouse, we bring original information on how species occupy and share the commensal space, and make predictions on the evolution of these communities in a period of ever‐accelerating global changes.

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Section: Discussionmentioning

confidence: 99%

Sharing space between native and invasive small mammals: Study of commensal communities in Senegal

Granjon,

Artige,

Bâ

et al. 2023

Ecology and Evolution

View full text Add to dashboard Cite

show abstract

“…Instead, the house mouse may well be favoured in urbanized environments such as those that are developing in sub-Saharan Africa, as exemplified by the situation observed in Dakar (Stragier et al, 2020), and in most of the cities from the western part of Senegal North of the Gambia, that is, the area which has benefitted from the groundnut trade for its early and accelerated development since the 1960s (Lombard et al, 2020). In such habitats, the small size of the house mouse could represent a real advantage to (i) better hide from predators (including humans), (ii) more easily slip into well-protected buildings and rooms and (iii) subsist on less abundant food resources.…”

Section: Co-occurrence Patternsmentioning

confidence: 99%

Sharing space between native and invasive small mammals: Study of commensal communities in Senegal

Granjon

Artige

Bâ³

et al. 2023

Preprint

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Urbanization processes are taking place at a very high rate, especially in Africa, these. At the same time, a number of small mammal species, be they native of invasive, take advantage of these human-induced habitat modifications. They represent commensal communities of organisms that cause a number of inconveniences to humans, including as potential reservoirs of zoonotic diseases. We studied via live trapping and habitat characterization such commensal small mammal communities in small villages to large cities of Senegal, to try understand how the species share this particular space. Seven major species were recorded, with exotic invasive house mice (Mus musculus) and black rats (Rattus rattus) dominating in numbers. The shrew Crocidura olivieri appeared as the main and more widespread native species, while native rodent species (Mastomys natalensis, M. erythroleucus, Arvicanthis niloticus and Praomys daltoni) were less abundant and/or more localized. Habitat preferences, compared between species in terms of room types and characteristics, showed differences between house mice, black rats and M. natalensis especially. Niche (habitat component) breadth and overlap were measured. Among invasive species, the house mouse showed a larger niche breadth than the black rat, and overall, all species displayed high overlap values. Co-occurrence patterns were studied at the locality and local scales. The latter show cases of aggregation (between the black rat and native species, for instance) and of segregation (as between the house mouse and the black rat in Tambacounda, or between the black rat and M. natalensis in Kédougou). While updating information on commensal small mammal distribution in Senegal, a country submitted to a dynamic process of invasion by the black rat and the house mouse, we bring original information on how species occupy and share the commensal space, and make predictions on the evolution of these communities in a period of ever-accelerating global changes.

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Same Invasion, Different Routes: Helminth Assemblages May Favor the Invasion Success of the House Mouse in Senegal

et al. 2021

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Previous field-based studies have evidenced patterns in gastrointestinal helminth (GIH) assemblages of rodent communities that are consistent with “enemy release” and “spill-back” hypotheses, suggesting a role of parasites in the ongoing invasion success of the exotic house mouse (Mus musculus domesticus) in Senegal (West Africa). However, these findings came from a single invasion route, thus preventing to ascertain that they did not result from stochastic and/or selective processes that could differ across invasion pathways. In the present study, we investigated the distribution of rodent communities and their GIH assemblages in three distinct zones of Northern Senegal, which corresponded to independent house mouse invasion fronts. Our findings first showed an unexpectedly rapid spread of the house mouse, which reached even remote areas where native species would have been expected to dominate the rodent communities. They also strengthened previous insights suggesting a role of helminths in the invasion success of the house mouse, such as: (i) low infestation rates of invading mice by the exotic nematode Aspiculuris tetraptera at invasion fronts—except in a single zone where the establishment of the house mouse could be older than initially thought, which was consistent with the “enemy release” hypothesis; and (ii) higher infection rates by the local cestode Mathevotaenia symmetrica in native rodents with long co-existence history with invasive mice, bringing support to the “spill-back” hypothesis. Therefore, “enemy release” and “spill-back” mechanisms should be seriously considered when explaining the invasion success of the house mouse—provided further experimental works demonstrate that involved GIHs affect rodent fitness or exert selective pressures. Next steps should also include evolutionary, immunological, and behavioral perspectives to fully capture the complexity, causes and consequences of GIH variations along these invasion routes.

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Le nouvel horizon sénégalais

Cited by 3 publications

References 9 publications

Sharing space between native and invasive small mammals: Study of commensal communities in Senegal

Sharing space between native and invasive small mammals: Study of commensal communities in Senegal

Sharing space between native and invasive small mammals: Study of commensal communities in Senegal

Same Invasion, Different Routes: Helminth Assemblages May Favor the Invasion Success of the House Mouse in Senegal

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