The effect of temperature on asexual population growth of three species of Naididae (Oligochaeta)

Lochhead, G.; Learner, M. A.

doi:10.1007/bf02185627

Cited by 28 publications

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“…This species did not show any allegiance to specific types of habitat, since it is equally numerous in stony, sandy, and slimy bottoms. Lochhead & Learner (1983) and Juget et al (1989) investigated the effect of temperature on asexual population growth of N. variabilis, N. elinguis and P. equiseta. The mean population doubling time was about 3 days for N. variabilis and P. aequiseta at 20°C and the lowest was 22 days for P. aequiseta at 8°C.…”

Section: Temperature Ph and Oxygenmentioning

confidence: 99%

Sludge reduction by predatory activity of aquatic oligochaetes in wastewater treatment plants: science or fiction? A review

Ratsak¹,

Verkuijlen²

2006

Aquatic Oligochaete Biology IX

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Biological aerobic wastewater treatment plants (WWTPs) produce a lot of excess sludge. The costs for handling this residual product are increasing, so the search for alternative techniques to reduce the amount of sludge has to be continued. Activated sludge consists of inorganic and organic substances, bacteria, protozoa and metazoa. Due to incomplete biomass conversion, sludge consumption yields less oligochaete biomass. From a technological point of view, the application of aquatic oligochaetes to reduce the sludge production offers interesting perspectives. This paper aims to review the feasibility for the reduction of activated sludge in WWTPs by means of aquatic oligochaetes. Also the current techniques concerning sludge reduction are taken into account. Several of the WWTPs relevant parameters, which may influence predatory activity of aquatic oligochaetes, are discussed: particle size, organic content of substrate, bacteria preference, life cycle and population dynamics of aquatic oligochaetes, temperature, pH, oxygen and process conditions. From the literature it appeared that most research has been performed on laboratory scale. Only a few authors mention a significant reduction of the sludge production by 'sessile' species such as Lumbriculus. Vermicultures for the reduction of activated sludge are rather common in developing countries. Incidentally large annelid blooms have been noticed in WWTPs. It remains obscure which factors trigger the initiation of annelid blooms in WWTPs and which are of importance to maintain a stable annelid population in WWTPs. The influence of a considerable worm bloom on the waste sludge production is still under investigation.

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Section: Temperature Ph and Oxygenmentioning

confidence: 99%

Sludge reduction by predatory activity of aquatic oligochaetes in wastewater treatment plants: science or fiction? A review

Ratsak¹,

Verkuijlen²

2006

Aquatic Oligochaete Biology IX

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“…Entre ellos se destacan: la temperatura, la disponibilidad de alimento, la profundidad, la conductividad, el tenor de oxígeno disuelto y el fotoperíodo (Learner et al 1978, Loden 1981, Lochhead & Learner 1983, Smith 1986, Irmler 1989, Schierwater & Hauenschild 1990a. En el caso particular de la temperatura, si bien la mayoría de las especies registran un incremento en su tasa de fisión con el aumento en la misma, en ciertas especies, entre las cuales se encuentra Stylaria lacustris, la mayor abundancia ocurre en ambientes con menor temperatura (Poddubnaya 1972, Learner et al 1978, Lochhead & Learner 1983, Smith 1986, Irmler 1989. Tal es el caso de la población de S. lacustris estudiada durante dos ciclos anuales en Argentina, dónde se registró su pico de abundancia a fines del invierno y principios de primavera (temperatura del medio entre 13-15 °C) y su ausencia durante el verano, presentando de esta manera una clara estacionalidad (Armendáriz 2000).…”

Section: Discussionunclassified

Efectos de la temperatura sobre el crecimiento individual y formación de zooides en Stylaria lacustris (Linnaeus, 1767) (Oligochaeta, Naididae)

Armendáriz¹

2007

Biota Neotrop.

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The experiments carried out with S. lacustris showed that the temperature plays a role of importance in the rate of asexual reproduction, as for the number of zooids produced by individual, as well as to the size reached by them. On the other hand, it would regulate the rate of growth and the sexual reproduction, giving place to the maturity of the individuals when temperature increases. The life time of the immature individuals was estimated in 15 days, being this independent of the temperature used in the cultures. The mature individuals lived on the average 37 days. The survival in S. lacustris was falling gradually, following a curve of type lll. Life expectancy presented its major value at the age of 16 days and stayed approximately constant up to an age of 28 days, after then falled persistently until the last reached age. The individual growth according to von Bertalanffy equation, was estimated for the organisms maintained at 23 2 °C and at 14 1 °C. Those individuals cultivated at higher temperature attained a bigger size, although their rate of growth was smaller than those maintained at 14 °C.Keywords: cultures, asexual reproduction, Argentina. ResumenArmendáriz, L.C. Efectos de la temperatura sobre el crecimiento individual y formación de zooides en Stylaria lacustris (Linnaeus, 1767) (Oligochaeta, Naididae) Biota Neotrop. May/Aug 2007 vol. 7, no. 2 http:// www.biotaneotropica.org.br/v7n2/pt/abstract?article+bn00907022007. ISSN 1676-0603.Los cultivos realizados con S. lacustris demostraron que la temperatura juega un papel de importancia en la tasa de la reproducción, en cuanto al número de zooides producido por individuo así como también al tamaño alcanzado por los mismos. Por otro lado, regularía la tasa de crecimiento y la reproducción sexual, dando lugar a la madurez de los individuos cuando aumenta la temperatura. El tiempo de vida promedio de los individuos inmaduros se estimó en 15 días, siendo este valor independiente de la temperatura utilizada en los cultivos. Los individuos maduros vivieron en promedio 37 días. La supervivencia en S. lacustris fue decreciendo gradualmente, según una curva de tipo lll. La expectativa de vida presentó su pico a la edad de 16 días y se mantuvo aproximadamente constante hasta una edad de 28 días a partir de la cual fue decreciendo en forma persistente hasta la última edad alcanzada. Se estimó el crecimiento individual, según la ecuación de von Bertalanffy, para los organismos mantenidos a 23 2 °C y a 14 1 °C. En aquellos individuos cultivados a mayor temperatura se registró una mayor talla, aunque su tasa de crecimiento fue menor que la de los individuos mantenidos a 14 °C.Palabras-clave: cultivos, reproducción asexual, Argentina.

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“…Similar to our results, the longest population doubling times were found for Nais sp. Under more natural conditions (laboratory set-ups with polluted river water and detritus as food source), the population doubling times of several Nais species were longer (3-16 days) (Lochhead & Learner, 1983;Schönborn, 1985).…”

Section: Population Dynamicsmentioning

confidence: 99%

Population dynamics of free-swimming Annelida in four Dutch wastewater treatment plants in relation to process characteristics

et al. 2008

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Free-swimming Annelida occasionally occur in very high densities in WWTPs (WasteWater Treatment Plants) and are nowadays applied for waste sludge reduction, but their growth is uncontrollable. In order to get more insight in the population dynamics of these free-swimming Annelida, and relate their presence to process characteristics, nine ATs (Aeration Tanks) of four Dutch WWTPs were regularly sampled over a 2.5-year period. For each species, peak periods in worm population growth were defined and population doubling times and half-lives calculated. Peak periods and doubling times were compared to those in natural systems. Process characteristics were obtained from the plant operators and related to the worm populations by multivariate analysis for the first time in large-scale WWTPs. The species composition in the WWTPs was limited and the most abundant free-swimming Annelida were in decreasing order Nais spp., Aeolosoma hemprichi, Pristina aequiseta, Aeolosoma variegatum, Chaetogaster diastrophus, and Aeolosoma tenebrarum.This latter species had never been found before in WWTPs. Worm absence sometimes coincided with the presence of anoxic zones, but this was possibly overcome by higher temperatures in the WWTPs. Worms were present all year round, even in winter, but no yearly recurrences of population peaks were observed, probably as a result of stable food supply and temperature, and the lack of predation in the WWTPs. Peak periods were similar between the ATs of each WWTP. The duration of the peak periods was on average 2-3 months for each species and the population doubling times in the peak periods were short (on average 2-6 days), which also corresponds to a stable favorable environment. The disappearance of worm populations from the WWTPs was presumably caused by declining asexual reproduction and subsequent removal with the waste sludge. Multivariate analysis indicated that 36% of the variability in worm populations was due to spatial and temporal patterns only. In addition, no more than 4% of the variability in worm populations was related to variations in process characteristics only and worm presence was usually associated with better sludge settleability. In conclusion, our data from large-scale Hydrobiologia (2008) 605:131-142 DOI 10.1007 WWTPs suggest that growth of free-swimming Annelida still seems uncontrollable and that their effects on treatment processes are unclear, which makes stable application in wastewater treatment for sludge reduction difficult.

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The effect of temperature on asexual population growth of three species of Naididae (Oligochaeta)

Cited by 28 publications

References 11 publications

Sludge reduction by predatory activity of aquatic oligochaetes in wastewater treatment plants: science or fiction? A review

Sludge reduction by predatory activity of aquatic oligochaetes in wastewater treatment plants: science or fiction? A review

Efectos de la temperatura sobre el crecimiento individual y formación de zooides en Stylaria lacustris (Linnaeus, 1767) (Oligochaeta, Naididae)

Population dynamics of free-swimming Annelida in four Dutch wastewater treatment plants in relation to process characteristics

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