Population Biology of the Freshwater Snail Bulinus globosus on the Kenya Coast. II. Feeding and Density Effects on Population Parameters

O’Keeffe, Joanna

doi:10.2307/2403329

Cited by 15 publications

(11 citation statements)

References 4 publications

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“…Other studies have suggested that density-dependent declines in snail growth, reproduction, and survival can be a direct result of food limitation ( O'Keeffe 1985 ). Because snails in the present study were fed in excess at all densities, it is not likely that food limitation can explain the negative density effect.…”

Section: Discussionmentioning

confidence: 99%

Effects of husbandry parameters on the life‐history traits of the apple snail, Marisa cornuarietis: effects of temperature, photoperiod, and population density

Aufderheide¹,

Warbritton²,

Pounds

et al. 2006

Invertebrate Biology

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Abstract. These experiments are part of a larger study designed to investigate the influence of husbandry parameters on the life history of the apple snail, Marisa cornuarietis. The overall objective of the program is to identify suitable husbandry conditions for maintaining multigeneration populations of this species in the laboratory for use in ecotoxicological testing. In this article, we focus on the effects of photoperiod, temperature, and population density on adult fecundity and juvenile growth. Increasing photoperiod from 12 to 16 h of light per day had no effect on adult fecundity or egg hatching and relatively minor effects on juvenile growth and development. Rearing snails at temperatures between 221C and 281C did not influence the rates of egg production or egg clutch size. However, the rates of growth and development (of eggs and juveniles) increased with increasing temperature in this range, and when temperatures were reduced to 221C egg-hatching success was impaired. Juvenile growth and development were more sensitive to rearing density than adult fecundity traits. On the basis of the present results, we conclude that rearing individuals of M. cornuarietis at a temperature of 251C, a photoperiod of 12L:12D, and a density of o0.8 snails L À1 (with lower densities for juvenile snails) should provide favorable husbandry conditions for maintaining multi-generation populations of this species.

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Section: Discussionmentioning

confidence: 99%

Effects of husbandry parameters on the life‐history traits of the apple snail, Marisa cornuarietis: effects of temperature, photoperiod, and population density

Aufderheide¹,

Warbritton²,

Pounds

et al. 2006

Invertebrate Biology

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“…For food, the snails feed on the microflora and decaying plant matter of the water lily leaves. 28 Aquatic macrophytes may also protect snails from predators such as birds. A pitfall that may result in an overemphasis of the importance of water lily leaves is that they are much easier to sample than a dense stand of grass or sedges.…”

Section: Discussionmentioning

confidence: 99%

Distribution Patterns and Cercarial Shedding of Bulinus Nasutus and Other Snails in the Msambweni Area, Coast Province, Kenya

Kariuki

Clennon²,

Brady³

et al. 2004

The American Journal of Tropical Medicine and Hygiene

103

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In the Msambweni area of the Kwale District in Kenya, an area endemic for Schistosoma haematobium, potential intermediate-host snails were systematically surveyed in water bodies associated with human contact that were previously surveyed in the 1980s. Bulinus (africanus) nasutus, which accounted for 67% of the snails collected, was the only snail shedding S. haematobium cercariae. Lanistes purpureus was the second most common snail (25%); lower numbers of Bulinus forskalii and Melanoides tuberculata were also recovered. Infection with non-S. haematobium trematodes was found among all snail species. Rainfall was significantly associated with the temporal distribution of all snail species: high numbers of Bulinus nasutus developed after extensive rainfall, followed, in turn, by increased S. haematobium shedding. Spatial distribution of snails was significantly clustered over a range of up to 1 km, with peak clustering observed at a distance of 400 meters. Water lily (Nymphaea spp.) and several aquatic grass species appeared necessary for local colonization by B. nasutus or L. purpureus.

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“…It also allowed experimental manipulation of densities and feeding regimes in semi-natural conditions (these are described in detail in O'Keeffe (1985)). This provided measures of age-specific reproduction and growth rates for snails too small (<2 mm) to be paint-marked.…”

Section: Methodsmentioning

confidence: 99%

Population Biology of the Freshwater Snail Bulinus globosus on the Kenya Coast. I. Population Fluctuations in Relation to Climate

Yang

Wu²,

Wu³

et al. 1985

The Journal of Applied Ecology

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org. This content downloaded from 130.102.42.98 on Mon, SUMMARY(1) Bulinus globosus populations were sampled weekly in two reservoirs over 2 years, using plastic sheet snail traps and mark recapture techniques to measure density, growth rates and reproduction.(2) Captive cohorts were raised in netted boxes in the reservoirs to measure age specific reproduction and egg viability.(3) Growth rates were used to identify snail cohorts, and life tables were constructed to measure mortality rates and the intrinsic rate of natural increase (rm).(4) Values for ri were inversely related to mean water temperatures, with no positive values when the mean water temperature exceeded 28-5 'C during a cohort's early reproductive phase.(5) Rainfall (and associated environmental variables) appear to influence the carrying capacity of the snail habitat, so that in both reservoirs, populations increased fastest and to the highest densities when large amounts of unseasonal rain fell during the coolest months.

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Population Biology of the Freshwater Snail Bulinus globosus on the Kenya Coast. II. Feeding and Density Effects on Population Parameters

Cited by 15 publications

References 4 publications

Effects of husbandry parameters on the life‐history traits of the apple snail, Marisa cornuarietis: effects of temperature, photoperiod, and population density

Effects of husbandry parameters on the life‐history traits of the apple snail, Marisa cornuarietis: effects of temperature, photoperiod, and population density

Distribution Patterns and Cercarial Shedding of Bulinus Nasutus and Other Snails in the Msambweni Area, Coast Province, Kenya

Population Biology of the Freshwater Snail Bulinus globosus on the Kenya Coast. I. Population Fluctuations in Relation to Climate

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