Response of grazing snails to phosphorus enrichment of modern stromatolitic microbial communities

Elser, James J.; Schampel, John H.; Kyle, Marcia; Watts, J. M.; Carson, Evan W.; Dowling, Thomas E.; Tang, Carol M.; Roopnarine, Peter D.

doi:10.1111/j.1365-2427.2005.01453.x

Cited by 65 publications

(72 citation statements)

References 39 publications

(71 reference statements)

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“…A possible explanation for the relationship with TP is that very low C:P values in snail tissue reflecting highly P-enriched sediments could inhibit the growth and survival of M. melanioides. P is a fundamental nutrient for invertebrate growth (Elser et al 2000), but the snails live on a stoichiometric knife edge, which means that snail growth requires at least moderate values of C:P in their tissues (Elser 2005). In Lake Dianchi, M. melanioides probably could absorb a large amount of P by ingesting P-rich microbes and nonliving organic matter.…”

Section: Population Structure In Lake Dianchimentioning

confidence: 99%

Population structure of an endemic gastropod in Chinese plateau lakes: evidence for population decline

et al. 2013

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Abstract. The highly endemic diversity of the Yun-Gui plateau lakes has decreased severely in recent decades. Protecting these native species is a challenge, in part because their biology and population ecology remain unexplored. We investigated 1 focal endangered gastropod species (Margarya melanioides) in 1 plateau lake: 1) to quantify spatiotemporal variation in population abundance and size structure, and 2) to identify the key variables influencing these variations. Density was 0.068 individuals/m 2 with an estimated total population size of 2.1 3 10 7 individuals. The size-frequency distribution was skewed toward larger, mature individuals (40.0-60.0 mm), a result indicating that the population is aging. Population size structure showed high spatial heterogeneity, and density was highest in the north-central region of the lake. Redundancy analysis indicated that human-induced environmental degradation strongly controlled the spatial patterns in size-structure. This species has experienced a remarkable decrease in range and population size over the past 50 y, and the population probably will collapse by 2015. The decline could be attributed to demographic drift, environmental filtering, human harvesting, and its limited dispersal ability. Our studies should give useful information for building efficient conservation strategies for M. melanioides and other threatened plateau gastropods. Further studies are needed on the population ecology and reproductive biology of M. melanioides, particularly on its reproductive behavior and size-specific survivorship.

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Section: Population Structure In Lake Dianchimentioning

confidence: 99%

Population structure of an endemic gastropod in Chinese plateau lakes: evidence for population decline

et al. 2013

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“…While epiphytes are a major component of the diet of gastropods, the silicon (Si) from these algae can also influence their dynamics, as Si keeps aquatic ecosystems healthy through viable plant production [34]. In addition, several studies focus on the effects of carbon, nitrogen, and phosphorous (CNP) stoichiometry on snails [35], including physiological responses to stoichiometric constraints: nutrient limitation and compensatory feeding in a freshwater snail [36,37].…”

Section: Introductionmentioning

confidence: 99%

Potential Indicator Value of Subfossil Gastropods in Assessing the Ecological Health of the Middle and Lower Reaches of the Yangtze River Floodplain System (China)

et al. 2018

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Abstract:The lakes across China's middle and lower reaches of the Yangtze River system have a long history of sustaining human pressures. These aquatic resources have been exploited for fisheries and irrigation over millennia at a magnitude of scales, with the result that many lakes have lost their ecological integrity. The consequences of these changes in the ecosystem health of lakes are not fully understood; therefore, a long-term investigation is urgently needed. Gastropods (aquatic snails) are powerful bio-indicators that link primary producers, herbivores, and detritivores associated with macrophytes and grazers of periphyton and higher-level consumers. They are sensitive to abrupt environmental change such as eutrophication, dehydration, flooding, and proliferation of toxicity in floodplain lake systems. The use of the remains of gastropod shells (subfossils) preserved in the sedimentary archives of the floodplain lakes of the middle and lower reaches of the Yangtze River system holds high significance, as their potential in environmental change has not been studied in detail in the past. Here, we aim to test the hypothesis that modern and sub-fossil gastropods in the sediments of the middle and lower reaches of the Yangtze River floodplains systems have significant value as bioindicators, as they have the ability to reveal health-gradients of lake-ecosystem change in the region.

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“…Periphyton containing sedimentary autotrophs has been found to be strongly P-limited (Sabater et al 2000, Elser et al 2005a. Nutrient enrichment in calcifying environments may affect algal composition and C:P:N ratios (Elser et al 2005a), and, at the same time, may control the growth and metabolism of grazing snails (Elser et al 2005b). Inorganic P can slow calcite growth, and, at higher concentrations, even cause it to stop (Plant & House 2002).…”

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confidence: 99%

Response of periphyton to nutrient addition in a tufa-depositing environment

Kepčija¹,

Miliša²,

Perić³

et al. 2011

Aquat. Microb. Ecol.

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We examined the effects of added nutrients on primary producers, protozoans and meiofauna -as well as on tufa deposition -in a short-term in situ experiment using nutrientdiffusing substrata. The study was carried out in the tufa-depositing barrage lake system National Park Plitvice Lakes (Croatia). To address the question of whether the extent of tufa deposition and the flow velocity modify the response of periphyton to nutrient addition, we selected 2 sites -fast flow (FF) and slow flow (SF) -on each of the 2 barriers, one barrier having a low rate of tufa deposition (LTD) and the other having a high rate of tufa deposition (HTD). The nutrients examined were nitrogen (N), phosphorus (P), and their combination (N+P). Both N and P were limiting nutrients for autotrophs in periphyton, and the response to nutrient enrichment was lower at HTD sites. A combination of HTD and FF was the most limiting factor for periphyton. Nutrient enrichment did not impede calcite deposition; P enrichment even enhanced calcite deposition -probably as a result of a denser autotrophic periphyton matrix. HTD supported a lower taxa richness of heterotrophs in the periphyton, and flow velocity had taxa-specific effects. The addition of nutrients led to a decrease in the number of heterotrophic taxa at FF sites, while there was no effect at SF sites. The response of ciliates to flow velocity was taxa-specific. The effect of nutrients on the abundance of heterotrophs was rather weak, except for omnivorous and bacterivorous ciliates. Our results showed a direct effect of N and P on autotrophic periphyton in this tufa-depositing system, and only a weak effect on protozoans and micro-metazoans. KEY WORDS: Flow velocity · Chlorophyll a · Protozoa · Nutrient limitation Resale or republication not permitted without written consent of the publisherAquat Microb Ecol 65: [183][184][185][186][187][188][189][190][191][192][193][194][195] 2011 ( Andrushchyshyn et al. 2006). Bernhardt & Likens (2004) showed that eutrophication does not have an effect on the biomass of periphyton. To date, the effects of nutrient enrichment on protozoa have been examined in lakes (Hillebrand et al. 2002), rivers (Rublee & Partusch-Talley 1995) and streams (Domènech et al. 2006). While weak effects of nutrient enrichment on ciliate biomass were reported by Hillebrand et al. (2002), Rublee & Partusch-Talley (1995) ob served a significant increase in the abundance and biomass of heterotrophic microfauna after the addition of N+P, but no significant difference after the addition of P alone. Domènech et al. (2006) attributed an increase in ciliate density to the addition of N+P, whereas flagellates and testate amoebae were reported to be less sensitive to nutrient enrichment.Tufa develops under specific physico-chemical conditions as an ambient temperature freshwater carbonate deposit in which biological remains (particularly those of macrophyte stands) may comprise significant parts of deposited frameworks (Pedley 2000). Tufa formation is also responsible for i...

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Response of grazing snails to phosphorus enrichment of modern stromatolitic microbial communities

Cited by 65 publications

References 39 publications

Population structure of an endemic gastropod in Chinese plateau lakes: evidence for population decline

Population structure of an endemic gastropod in Chinese plateau lakes: evidence for population decline

Potential Indicator Value of Subfossil Gastropods in Assessing the Ecological Health of the Middle and Lower Reaches of the Yangtze River Floodplain System (China)

Response of periphyton to nutrient addition in a tufa-depositing environment

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