Spatial variation in anuran richness, diversity, and abundance across montane wetland habitat in Volcanoes National Park, Rwanda

Hoek, Yntze van der; Tuyisingize, Deogratias; Eckardt, Winnie; Garriga, Núria; Derhé, Mia A.

doi:10.1002/ece3.5054

Cited by 13 publications

(6 citation statements)

References 62 publications

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“…As target species, we continued to use the hypothetical terrestrially moving animals. For this particular study area, they might be exemplified by golden monkeys (Cercopithecus mitis kandti), which are half-meter-long primates that feed on bamboo, leaves, and fruits and are found in different types of vegetation, mostly forest and bamboo (Twinomugisha and Chapman 2008). As listed as an endangered subspecies (of the blue monkey) on the IUCN Red List, their population and range are declining due to habitat degradation, loss, and fragmentation as a result of human activities (Butynski and de Jong 2020).…”

Section: Methodsmentioning

confidence: 99%

On the effects of spatial resolution on effective distance measurement in digital landscapes

Murekatete

Shirabe

2021

Ecol Process

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Background Connectivity is an important landscape attribute in ecological studies and conservation practices and is often expressed in terms of effective distance. If the cost of movement of an organism over a landscape is effectively represented by a raster surface, effective distances can be equated with the cost-weighted distance of least-cost paths. It is generally recognized that this measure is sensitive to the grid’s cell size, but little is known if it is always sensitive in the same way and to the same degree and if not, what makes it more (or less) sensitive. We conducted computational experiments with both synthetic and real landscape data, in which we generated and analyzed large samples of effective distances measured on cost surfaces of varying cell sizes derived from those data. The particular focus was on the statistical behavior of the ratio—referred to as ‘accuracy indicator’—of the effective distance measured on a lower-resolution cost surface to that measured on a higher-resolution cost surface. Results In the experiment with synthetic cost surfaces, the sample values of the accuracy indicator were generally clustered around 1, but slightly greater with the absence of linear sequences (or barriers) of high-cost or inadmissible cells and smaller with the presence of such sequences. The latter tendency was more dominant, and both tendencies became more pronounced as the difference between the spatial resolutions of the associated cost surfaces increased. When two real satellite images (of different resolutions with fairly large discrepancies) were used as the basis of cost estimation, the variation of the accuracy indicator was found to be substantially large in the vicinity (1500 m) of the source but decreases quickly with an increase in distance from it. Conclusions Effective distances measured on lower-resolution cost surfaces are generally highly correlated with—and useful predictors of—effective distances measured on higher-resolution cost surfaces. This relationship tends to be weakened when linear barriers to dispersal (e.g., roads and rivers) exist, but strengthened when moving away from sources of dispersal and/or when linear barriers (if any) are detected by other presumably more accessible and affordable sources such as vector line data. Thus, if benefits of high-resolution data are not likely to substantially outweigh their costs, the use of lower resolution data is worth considering as a cost-effective alternative in the application of least-cost path modeling to landscape connectivity analysis.

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Section: Methodsmentioning

confidence: 99%

On the effects of spatial resolution on effective distance measurement in digital landscapes

Murekatete

Shirabe

2021

Ecol Process

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“…Altitudinal range and province records in Rwanda: 1287-1785 m; Southern and Eastern Provinces. Erroneously reported from Volcanoes National Park based on misidentified H. castaneus [56,57] and H. glandicolor [129,130].…”

Section: Afrixalus Quadrivittatus (Werner 1908) (Figures 6c and 7c)mentioning

confidence: 99%

“…Distribution: It is one of the most abundant species in Burundi, DR Congo, Ethiopia, Kenya, Rwanda, Sudan, Tanzania, and Uganda at elevations of up to 2400 m. Altitudinal range and province records in Rwanda: 1287-2143 m; all 5 provinces. Erroneously reported from up to 3000 m in Volcanoes National Park based on misidentified H. glandicolor [56,129,130].…”

Section: External Morphologymentioning

confidence: 99%

“…Distribution: The species occurs from Angola to Rwanda and Burundi, and to southern Tanzania, Malawi, and northeastern Zimbabwe at elevations of 900-2400 m. Altitudinal range and province records in Rwanda: 1292-1839 m; Western and Eastern Provinces. Erroneously reported from higher elevations in Volcanoes National Park based on misidentified P. graueri by [129,130].…”

Section: Advertisement Callmentioning

confidence: 99%

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Amphibians of Rwanda: Diversity, Community Features, and Conservation Status

Dehling

Sinsch

2023

Diversity

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The diversity and distribution of the amphibians in Rwanda was critically reviewed to provide a reliable species inventory for informed conservation management. The checklist of the amphibian species of Rwanda is based on results of our own fieldwork, historical records compiled from the literature, and examination of voucher specimens in museum collections. A total of 62 species are recorded, and 22 further species listed in field guides and open-access data bases are discussed, identified as erroneous records, and consequently not included in the country list. We provide diagnostic characters of external morphology and the advertisement call for each validated species, and a short synopsis of geographic distribution, altitudinal range, occurrence in the provinces of Rwanda, and habitat preference. We provide keys to all genera, and all taxonomically described species based on morphological characters and additional keys based on features of the advertisement calls. We discuss features of amphibian communities including local community structure and delimitation of altitudinal metacommunities. Based on the IUCN red list assessment and our field surveys, we propose for the first time a national red list of amphibians in Rwanda.

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“…For example, it is possible to take adaptive management decisions by evaluating rates of arrival and succession of colonising plant species (Lavoie et al, 2003). Such monitoring efforts may be conducted by remote sensing techniques (Orimoloye et al, 2019; Slagter et al, 2020; Thamaga et al, 2021), though field‐based mapping may currently be the only option for very small wetlands such as those found in the Virunga Massif in eastern Africa (van der Hoek et al, 2019). Here, we present efforts to map upland plant encroachment via on‐the‐ground measurements in a series of small Afromontane wetlands in Volcanoes National Park (VNP; Rwanda).…”

Section: Introductionmentioning

confidence: 99%

Preliminary evidence of upland plant encroachment in high‐elevation wetlands of Volcanoes National Park, Rwanda

et al. 2023

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Wetland ecosystems are increasingly altered by anthropogenic activities, with upland plant encroachment as one possible outcome. Here, we present preliminary evidence that encroachment by herbaceous and woody upland species is ongoing in five small Afromontane wetlands straddling high elevations (~2600-3400 m a.s.l.) in Volcanoes National Park (Rwanda). Although encroachment seems to commence at wetland edges it reaches waterlogged soils at wetland centres. This evidence of the spread of upland plants in these wetlands should be followed by additional research efforts focused on possible causes and consequences of this encroachment as well as the exploration of potential management and mitigation efforts. RésuméLes écosystèmes des zones humides sont progressivement altérés par les activités anthropiques, l'empiètement des plantes des hautes terres étant l'une des conséquences possibles. Nous présentons ici des preuves préliminaires de l'empiètement des espèces herbacées et ligneuses des hautes terres dans cinq petites zones humides afromontanes situées à cheval sur des altitudes élevées (~2600-3400 m a.s.l.) dans le Parc National des Volcans (Rwanda). Bien que l'empiètement semble commencer au bord des zones humides, il atteint les sols gorgés d'eau au centre des zones humides.Cette preuve de la propagation des plantes des hautes terres dans ces zones humides devrait être suivie d'efforts de recherche supplémentaires axés sur les causes et les conséquences possibles de cet empiètement, ainsi que sur l'exploration des efforts potentiels de gestion et d'atténuation.

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Spatial variation in anuran richness, diversity, and abundance across montane wetland habitat in Volcanoes National Park, Rwanda

Cited by 13 publications

References 62 publications

On the effects of spatial resolution on effective distance measurement in digital landscapes

On the effects of spatial resolution on effective distance measurement in digital landscapes

Amphibians of Rwanda: Diversity, Community Features, and Conservation Status

Preliminary evidence of upland plant encroachment in high‐elevation wetlands of Volcanoes National Park, Rwanda

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