Ecology and Conservation of the Land-Snails of the Eastern Arc Mountains

Tattersfield, Peter; Seddon, Mary; Meena, C.; Kayumbo, N.; Kasigwa, Peter F.

doi:10.2982/0012-8317(1998)87[119:eacotl]2.0.co;2

Cited by 13 publications

(14 citation statements)

References 9 publications

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“…These three sites may be exceptional in an East African context although it should be noted that they were also sampled more intensively than those on Mount Kenya. Elsewhere in East Africa, overall species richness appears to be lower (Tattersfield et al. , 1998) and more comparable with, or lower than, that found on Mount Kenya.…”

Section: Discussionmentioning

confidence: 64%

“…, 1998) and more comparable with, or lower than, that found on Mount Kenya. The lowest levels of diversity were reported in the Nguru Mountains of northern Tanzania (Tattersfield et al. , 1998).…”

Section: Discussionmentioning

confidence: 97%

“…de Winter & Gittenberger, 1998). However, Tattersfield (1996, 1998) and Tattersfield et al. (1998) used broadly similar methods involving direct search and litter sieving techniques in Kakamega Forest, Kenya, and several coastal forests and four Eastern Arc mountain ranges in Tanzania, although the duration of the direct search and volume of litter searched varied.…”

Section: Discussionmentioning

confidence: 99%

“…de Winter & Gittenberger, 1998). However, Tatters®eld (1996Tatters®eld ( , 1998 and Tatters®eld et al (1998) used broadly similar methods involving direct search and litter sieving techniques in Kakamega Forest, Kenya, and several coastal forests and four Eastern Arc mountain ranges in Tanzania, although the duration of the direct search and volume of litter searched varied. Mollusc species richness at the individual sampling sites on Mount Kenya does not approach the totals of forty-®ve, ®fty and ®fty-seven species recorded, respectively, from the single altitude sites of the limestone forest at Kimboza in the Ulugurus (350 m altitude) in Tanzania, Kakamega Forest (1600 m) in western Kenya or Bomole Forest (1000 m) in the East Usambaras, Tanzania.…”

Section: Discussionmentioning

confidence: 99%

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Land‐snail faunas of afromontane forests of Mount Kenya, Kenya: ecology, diversity and distribution patterns

Tattersfield¹,

Warui²,

Seddon³

et al. 2001

Journal of Biogeography

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Aims To (1) describe the distribution patterns of land‐snails occurring in afromontane forest habitats on Mount Kenya, in relation to elevation and aspect; (2) explore the relations between the land‐snail faunas and environmental conditions within the forests. Location Mount Kenya, Kenya. Methods Molluscs were sampled using standardized direct search and litter sieving methods in a total of sixty‐four replicated plots along four elevational transects spanning an altitudinal range from 1782 to 2851 m on the east, west, south and north‐northwest sides of Mount Kenya. Elevation, vegetation type, forest structure, soil calcium, soil pH, mean annual rainfall and other environmental variables were measured on each plot. Correlation and joint regression analysis, and canonical correspondence analysis (CCA) were used to relate snail diversity and abundance, and faunal composition, to site elevation and other environmental variables. Results Sixty‐eight mollusc species were recorded during the study with transect totals between thirty‐four and fifty‐three species. Mean number of species and mean snail abundance ranged from 6.75 to 23.0 and 19 to 348 per plot, respectively. Overall, species richness and Shannon diversity index declined with increasing elevation. Snail abundance declined with increasing altitude along three transects and was positively related to soil pH and soil calcium, but species richness was not. Several species exhibited clear altitudinal distribution patterns. Mean annual rainfall varies greatly around the mountain and tends to decrease with altitude over the elevational range studied. Soil calcium and pH were negatively related to annual rainfall. Estimated mean annual rainfall accounted for the greatest variation in the mollusc fauna around the mountain. Faunas in forests on the drier, western side of Mount Kenya contained higher numbers of species in families that are characteristic of temperate latitudes, whereas tropical families were more prevalent on the wetter, south and east sides. Main conclusions Land‐snail diversity in Mount Kenya’s forests declines with elevation and thus follows the widespread pattern shown by most groups of organism. However, faunal variation appears to be more closely related to rainfall levels, than to altitude per se or the other environmental variables examined. The effects of rainfall on snails could either be direct, or indirect via its effects on soils or vegetation, but the study suggests that direct effects are more important. Indirect effects mediated by changes in soil chemistry appear to be less important because lower altitude sites with more strongly leached and acidic soils tend to have richer and more abundant snail faunas. The reason for the association of temperate latitude mollusc families with forests on the drier, western sides of the mountain is not clear. The number of mollusc species present in Mount Kenya’s forests is broadly comparable with that reported elsewhere in East African forests. However, overall, the data from this study and elsewher...

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Section: Discussionmentioning

confidence: 64%

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Land‐snail faunas of afromontane forests of Mount Kenya, Kenya: ecology, diversity and distribution patterns

Tattersfield¹,

Warui²,

Seddon³

et al. 2001

Journal of Biogeography

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“…Dadagulella selene comb. nov., a species with a more rounded apex and apical whorls with "a hint of spiral engraving", deserves further investigation from this perspective although its authors (van Bruggen & Van Goethem 1999) Tattersfield, 1998, with which they occur at several Tanzanian sites (Tattersfield 1998b) in lacking the downturned aperture of adult Juventigulella.…”

Section: Descriptionmentioning

confidence: 99%

Revision of Dadagulella gen. nov., the “Gulella radius group" (Gastropoda: Streptaxidae) of the eastern Afrotropics, including six new species and three new subspecies

Rowson

Tattersfield

2013

EJT

950

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The genus Dadagulella gen. nov. is described to include 16 species of small, dentate, ovate-acuminate Afrotropical snails. An identification key is provided and biogeography, anatomy and systematics are discussed. The type species is the Kenyan D. radius (Preston, 1910) comb. nov., whose name has informally been used for part of the group in the past. Substantial intraspecific variation occurs in three species: D. radius itself, D. browni (van Bruggen, 1969) comb. nov. and D. minuscula (Morelet, 1877) comb. nov. (= Ennea fischeriana Morelet, 1881) (non Gulella minuscula Emberton & Pearce, 2000) . We recognise subspecies within each of these: D.radius radius (Preston, 1910) comb. nov., D. r. calva (Connolly, 1922) comb. et stat. nov., D. browni browni (van Bruggen, 1969) comb. nov., D. b. mafiensis subsp. nov., D. b. semulikiensis subsp. nov., D. minuscula minuscula (Morelet, 1877) comb. nov., D. m. mahorana subsp. nov. Six new Tanzanian species are described: D. cresswelli sp. nov., D. delta sp. nov., D. ecclesiola sp. nov., D. frontierarum sp. nov., D. minareta sp. nov., and D. pembensis sp. nov. The genus includes seven other previously described species: D. cuspidata (Verdcourt, 1962) comb. nov.; D. rondoensis (Verdcourt, 1994) comb. nov.; D. conoidea (Verdcourt, 1996) comb. nov.; D. selene (van Bruggen & Van Goethem, 1999) comb. nov.; D. meredithae (van Bruggen, 2000) comb. nov.; D. nictitans (Rowson & Lange, 2007) comb. nov.; and D. delgada (Muratov, 2010) comb. nov.

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Gastropoda

Tattersfield¹

2011

Paleontology and Geology of Laetoli: Human Evolution in Context

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Ecology and Conservation of the Land-Snails of the Eastern Arc Mountains

Abstract: BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access titles in the biological, ecological, and environmental sciences published by nonprofit societies, associations, museums, institutions, and presses.

Cited by 13 publications

References 9 publications

Land‐snail faunas of afromontane forests of Mount Kenya, Kenya: ecology, diversity and distribution patterns

Land‐snail faunas of afromontane forests of Mount Kenya, Kenya: ecology, diversity and distribution patterns

Revision of Dadagulella gen. nov., the “Gulella radius group" (Gastropoda: Streptaxidae) of the eastern Afrotropics, including six new species and three new subspecies

Gastropoda

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