Abstract:
:Snail hosts of different ages constitute different resource environments for larval trematodes because each individual has a particular energy budget and energy allocation pattern at the time of infection. Effects of monomiracidial trematode infections on shell growth, body dry weight and reproductive effort of the snail host were compared between controls and infected juvenile and adult snails during the prepatent and patent periods. The results demonstrate phenotypic plasticity in the host response. There is an age/size-specific effect characterized by limitation of growth rate when snails are infected as juveniles and reduction of reproductive effort when snails are infected as adults, and a time-specific effect with early enhancement of growth rate and reproductive effort for infected juvenile and adult snails respectively during prepatency, before reduction and cessation during patency. The parasite is considered as a generalist in its energy exploitation strategy of the snail host, but taking into account the differential host responses observed relative to the host age, the possibility of a host preference for juvenile or adult snails is discussed.
journal_name
Oecologiajournal_title
Oecologiaauthors
Gérard C,Théron Adoi
10.1007/s004420050331subject
Has Abstractpub_date
1997-11-01 00:00:00pages
447-452issue
4eissn
0029-8549issn
1432-1939pii
10.1007/s004420050331journal_volume
112pub_type
杂志文章相关文献
OECOLOGIA文献大全abstract::With the increasing imperative for societies to act to curb climate change by increasing carbon stores and sinks, it has become critical to understand how organic carbon is produced, released, transformed, transported, and sequestered within and across ecosystems. In freshwater and open-ocean systems, shredders play a...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-019-04571-1
更新日期:2020-01-01 00:00:00
abstract::To investigate the physiological, behavioral, and genetic contributions to growth rate, we studied the thermal sensitivity of growth rate in hatchlings of the iguanid lizards Sceloporus occidentalis and S. graciosus in the laboratory. We used a cycling thermal regime patterned after thermal environments found in natur...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00379118
更新日期:1989-03-01 00:00:00
abstract::While trying to achieve their nutritional requirements, foraging herbivores face the costs of plant defenses, such as toxins. Teasing apart the costs and benefits of various chemical constituents in plants is difficult because their chemical defenses and nutrient concentrations often co-vary. We used an approach deriv...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-014-2980-0
更新日期:2014-08-01 00:00:00
abstract::The duration and amount of water captured on leaves and its functional significance is highly varied. Leaf surface wettability influences water absorption, gas exchange, pathogen infection, nutrient leaching, contamination by pollutants, self-cleaning properties and in freezing environments the probability of extrinsi...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-009-1437-3
更新日期:2010-01-01 00:00:00
abstract::Net photosynthetic rates for the lichen Parmelia praesignis Nyl. were obtained as a function of 5 light levels, 5 temperature levels, and of water content as thalli dried from saturated conditions. Data are described as second order polynomials in the light, and as saturation curves in the dark. Rates in the light wer...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00376872
更新日期:1984-10-01 00:00:00
abstract::The effect of invertebrate shredders on organic matter dynamics and phosphorus spiralling was studied over a 30-week period in laboratory streams. The streams were fed by groundwater, layered with cobble and gravel from a natural stream, covered with opaque material to eliminate algal growth, and initially contained 1...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00379855
更新日期:1985-05-01 00:00:00
abstract::The population metabolism of N. muscorum at a beechwood site in southern England was determined for two separate year periods by two methods; a detailed computer analysis and a 'best estimate'. These methods, which are based on data of biomass, population dynamics, field temperatures, and respiration rates of all life...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00347621
更新日期:1979-01-01 00:00:00
abstract::Intraspecific and intrasexual variation in home range size, body mass and ecological productivity is examined in three selected species of Carnivora (Felis rufus: Canis latrans; Ursus americanus), reflecting different diets. We then compare the intraspecific results with prior cross-species studies. Home range size an...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00634589
更新日期:1991-09-01 00:00:00
abstract::Atmospheric inputs of N and S in bulk deposition (open collectors) and throughfall (beneath canopy collectors) were measured in and adjacent to two Class 1 wilderness areas of the northeastern US. In general, atmospheric S inputs followed our expectations with throughfall S fluxes increasing with elevation in the Whit...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-014-3121-5
更新日期:2015-01-01 00:00:00
abstract::The need to allocate a limited amount of energy between different life-history traits is a fundamental assumption in life-history theory. However, it has often turned out to be extremely difficult to measure the competing processes that contribute to costs or benefits for individual organisms. The present investigatio...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00333257
更新日期:1995-05-01 00:00:00
abstract::Predators have far-reaching effects on communities by triggering top-down trophic cascades that influence ecosystem functioning. Omnivory and intraguild interactions between predators give rise to reticulate food webs and may either strengthen or dampen trophic cascades depending on context. Disentangling the effects ...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-015-3442-z
更新日期:2016-01-01 00:00:00
abstract::The central mudminnow (Umbra limi) and yellow perch (Perca flavescens) are two species of fishes that commonly co-occur in small bog lakes in the Great Lakes region of North America. Both species are dietary generalists with a high degree of dietary overlap, and perch populations have been shown to have a strong negat...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00379865
更新日期:1985-05-01 00:00:00
abstract::In this review I offer a solution to the problem why endotherm populations appear to be so inefficient in converting food energy into body substance despite the fact that individual endotherms are just as 'efficient' in this respect as individual ectotherms. Calculated for individuals of half the adult mass both ectot...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00379341
更新日期:1985-07-01 00:00:00
abstract::The mortality and physiological status (body water content) of Asellus aquaticus (Isopoda) and Gammarus pulex (Amphipoda) were measured after 25 days exposure in 20 natural streams with a pH range of 4.3-7.5 and a colour range of 8-280 mg Pt L-1. In addition, the effects of keeping the animals as single species or tog...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00317482
更新日期:1990-03-01 00:00:00
abstract::Release from natural enemies is often cited as a key factor for understanding the success of invasive plant species in novel environments. However, with time invasive species will accumulate native enemies in their invaded range, with factors such as spread distance from the site of introduction, climate and leaf-leve...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-017-4008-z
更新日期:2018-02-01 00:00:00
abstract::Studies relating reproduction to food availability are usually restricted to food quantity, but ignore food quality and the effects of habitat structure on obtaining the food. This is particularly true for insectivorous birds. In this study we relate measures of reproductive success, time of reproduction and nestling ...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s004420050074
更新日期:1997-01-01 00:00:00
abstract::We studied the nutritional behaviour of hinds foraging on a mixed-forest edge by direct observation of their choices at each season and by measuring nutrient concentration in the plants. We compared nutrient concentrations in the observed diets with those in the total available vegetation, and with those of 1,000 rand...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-008-1020-3
更新日期:2008-06-01 00:00:00
abstract::Most models of parental investment in offspring assume a trade-off between propagule size and number, and an increasing "concave down" function relating offspring fitness to propagule size. In this study, we test these two fundamental assumptions, using three closely related species of crickets, Gryllus firmus, G. vel...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00329806
更新日期:1995-06-01 00:00:00
abstract::Photosynthetic induction under constant and fluctuating light conditions was investigated in intact leaves of Alocasia macrorrhiza and Toona australis, two species native to Australian rainforests. When leaves were exposed to saturating light following a long period at low light intensity, an induction period of 25-40...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00410357
更新日期:1986-07-01 00:00:00
abstract::Much more tannic acid or pin oak tannin is required to precipitate the abundant leaf protein, ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBPC), from Manduca sexta gut fluid adjusted to pH 6.5 than is required to precipitate this protein from an aqueous buffer at the same pH. This finding demonstrates that some ...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00379632
更新日期:1984-03-01 00:00:00
abstract::Direct and interactive effects of daylength and temperature preconditioning of above- and below-ground parts of Chrysanthemum morifolium Ramat. 'Astrid' are examined in relation to net photosynthesis. Most previous work on thermal preconditioning has concentrated on the effects of a given thermal regime on entire plan...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00348072
更新日期:1979-01-01 00:00:00
abstract::Hawaiian lobeliads have radiated into habitats from open alpine bogs to densely shaded rainforest interiors, and show corresponding adaptations in steady-state photosynthetic light responses and associated leaf traits. Shaded environments are not uniformly dark, however, but punctuated by sunflecks that carry most of ...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-007-0936-3
更新日期:2008-03-01 00:00:00
abstract::The effects of density on growth and development of Scaphiopus couchi tadpoles in desert ponds were investigated, and sources of mortality over a three-year period were documented. In 16 of the 82 ponds monitored, predation was the principal cause of death, demonstrating that tadpoles in desert ponds may be exposed to...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00377299
更新日期:1987-01-01 00:00:00
abstract::The responses of Polygonum pensylvanicum L., an early successional annual, and of Polygonum virginianum L., a late successional perennial, were examined along discontinuous gradients of soil moisture, light and nutrient availability. In the case of P. virginianum both individuals grown from seed and individuals grown ...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00378779
更新日期:1986-03-01 00:00:00
abstract::Plant interactions with mutualists and antagonists vary remarkably across space, and have played key roles in the ecology and evolution of flowering plants. One dominant form of spatial variation is human modification of the landscape, including urbanization and suburbanization. Our goal was to assess how suburbanizat...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-013-2797-2
更新日期:2014-03-01 00:00:00
abstract::Temperature regulation and oxygen consumption were examined in two species of grasshoppers: Melanoplus sanguinipes from cold alpine tundra at elevation 3,800 m, and Trimerotropis pallidipennis from hot desert habitats at elevation 250 m. Both species utilized behavioral thermoregulation to keep body temperature (T b )...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00378228
更新日期:1983-01-01 00:00:00
abstract::Research on winter energy management in small vertebrates has focused on the regulation of body mass (BM) within a framework of starvation-predation trade-off. Winter-acclimatized birds exhibit a seasonal increase in both BM and basal metabolic rate (BMR), although the patterns of co-variation between the two traits r...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-018-04332-6
更新日期:2019-02-01 00:00:00
abstract::This paper considers prey size selection by four molluscivorous cichlids feeding on the intermediate host snail of Schistosoma parasites, Biomphalaria glabrata. Haplochromis ishmaeli obtains its prey by crushing the snails between the pharyngeal jaws, whereas H. xenognathus, H. sauvagei and Macropleurodus bicolor appl...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00379359
更新日期:1987-12-01 00:00:00
abstract::Multiple regression analyses were made of the effect of food composition upon energetic efficiency and existence energy of House Sparrows, Passer domesticus. Protein content of experimental food is the most important of eleven independent variables tested in the prediction of energetic efficiency. Other variables sign...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00345102
更新日期:1976-09-01 00:00:00
abstract::Among birds of the Bismarck Archipelago, only certain combinations of the species in a guild coexist on islands, and some species that are very similar ecologically have mutually exclusive distributions. Diamond (1975) interpreted these patterns as biologically significant, involving effects such as competition. Conno...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00349013
更新日期:1982-01-01 00:00:00