Novel temperature gradient incubator to study the effects of temperature on motile aquatic organisms

Heinze, Adam W.; Sanders, Robert W.

doi:10.4319/lom.2009.7.216

Cited by 2 publications

(4 citation statements)

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“…Light intensities at those depths were 144 and 868 µM m −2 s −1 at the time of sampling in 2005 and 2006, respectively, while temperatures were 14.6° and 13.6°C, and overall PAR fluxes during the week prior to each bloom were similar. Furthermore, Dinobryon are active swimmers and will migrate in response to temperature in the absence of light and nutrient gradients (Clegg et al 2003, Heinze & Sanders 2009). Dinobryon has a broad range of temperature in which it survives (Table 1).…”

Section: Discussionmentioning

confidence: 99%

“…Field data indicate that highest abundances of Dinobryon are often found at temperatures between 9 and 18°C (Fig. 4), and the tendency of Dinobryon to migrate to an intermediate temperature when light and nutrient levels were constant (Clegg et al 2003, Heinze & Sanders 2009) suggests that there may be a directed movement toward temperatures where growth rates are high. Nutrient concentrations were not reported for the studies plotted in Fig.…”

Section: Discussionmentioning

confidence: 99%

“…D. sertularia re sponded with slowed swimming and increased turning at 'preferred' temperatures in horizontal temperature gradients (Clegg et al 2003), and Dinobryon sp. migrated to depths with an intermediate temperature range in a vertical gradient in which light and nutrients were constant (Heinze & Sanders 2009). Nevertheless, the role of temperature in the vertical/depth distribution of the genus in lakes is essentially unexplored.…”

Section: Introductionmentioning

confidence: 99%

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Role of temperature in growth, feeding, and vertical distribution of the mixotrophic chrysophyte Dinobryon

Heinze

Truesdale

DeVaul

et al. 2013

Aquat. Microb. Ecol.

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Dinobryon spp. are common components of the phytoplankton in temperate lakes. While these chrysophytes link bacterial carbon as well as primary production to the larger food web, few studies have examined their vertical distribution over a season. Data were collected over a 2.5 yr period in mesotrophic Lake Lacawac in eastern Pennsylvania (USA) to examine water column attributes relating to seasonality of the mixotrophic alga D. cylindricum, and specifically to address a hypo thesis that abundance and vertical distribution in the genus are associated with temperature. This information was used to guide laboratory experiments examining temperature and light effects on growth, feeding, and vertical migration of cultured Dinobryon. Data from Lake Lacawac and the literature indicated that high abundances of Dinobryon were associated with a narrow range of temperature (9−18°C) relative to temperatures where they were present (3−26°C). High abundances of several species of Dynobryon were associated with this temperature range, and occurred from late winter to late spring, depending on latitude and depth in the water column. Although high Dinobryon abundances were not tied directly to levels of photosynthetically active radiation in Lake Lacawac, a UV-exclusion experiment in a nearby oligotrophic lake indicated a temperature-dependent negative effect of UV radiation. UV may limit the occurrence of Dinobryon populations in surface waters of clear oligotrophic lakes. Laboratory experiments showed that both light and temperature affected growth and feeding rates of Dinobryon, and that maximum feeding and growth rates occurred within the temperature range where high Dinobryon abundances were observed in field studies.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Role of temperature in growth, feeding, and vertical distribution of the mixotrophic chrysophyte Dinobryon

Heinze

Truesdale

DeVaul

et al. 2013

Aquat. Microb. Ecol.

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“…Whereas some groups such as diatoms are susceptible to sinking, many nanoflagellates are highly motile and can maintain their position in the water column. Stratification of motile flagellates are often to a species‐specific optimal environment based on light, temperature and/or nutrient availability (Clegg et al ; Ptacnik et al ; Heinze and Sanders ).…”

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confidence: 99%

Heterotrophic and mixotrophic nanoflagellates in a mesotrophic lake: Abundance and grazing impacts across season and depth

Princiotta

Sanders

2016

Limnology & Oceanography

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Nanoflagellates are recognized as fundamental members of the planktonic microbial food web due to their contribution to photosynthetic fixation of carbon and phagotrophic ingestion of bacteria. Although the presence, and often dominance, of mixotrophic nutrition among phytoflagellates has been well documented within a variety of aquatic ecosystems and in a range of taxa, few studies have assessed the abundance and grazing impact of mixotrophs in comparison to their photosynthetic and heterotrophic counterparts across seasons at multiple depths. Abundance and, as appropriate, bacterivory of phototrophic, heterotrophic, and mixotrophic nanoflagellates were quantified at three depths over a 15‐month period in Lake Lacawac (Pocono Mountains, Pennsylvania, U.S.A.) via microscopic analysis of ingested bacterial surrogates. The absolute and relative abundances of all nanoflagellate trophic groups varied with season and depth, likely as a result of differences in physiological tolerance. Whereas the abundance of phototrophic and heterotrophic nanoflagellates varied with depth in both the presence and absence of thermal stratification, mixotrophic protists were evenly distributed throughout the water column during mixis. The abundances of phototrophic and mixotrophic protists were significantly correlated, but only in surface waters during periods of thermal stratification. Grazing rate and consequent impact by bacterivorous nanoflagellates varied with depth across season, particularly during thermal stratification. Mixotrophic bacterivory exceeded that of heterotrophs in the epi‐ and metalimnion during stratification, removing an estimated maximum of 80% of the bacterial standing stock d−1. The relative contribution of heterotrophic nanoflagellates to community bacterivory increased with depth, even during mixis, and dominated the grazing impact in the hypolimnion.

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Novel temperature gradient incubator to study the effects of temperature on motile aquatic organisms

Cited by 2 publications

References 16 publications

Role of temperature in growth, feeding, and vertical distribution of the mixotrophic chrysophyte Dinobryon

Role of temperature in growth, feeding, and vertical distribution of the mixotrophic chrysophyte Dinobryon

Heterotrophic and mixotrophic nanoflagellates in a mesotrophic lake: Abundance and grazing impacts across season and depth

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