Freshwater phytoplankton — accessible, microbial, influential population dynamics

Tailing, J. F.

doi:10.1080/03680770.2001.11902544

Cited by 4 publications

(6 citation statements)

References 71 publications

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“…Nevertheless, this decline might result in a phytoplankton minimum that could either be accentuated by the zooplankton maximum (Windermere) or precede a zooplankton maximum that separately induced a later phytoplankton minimum by grazing (Esthwaite Water). These possibilities are envisaged in accounts of Chl changes in these lakes over short periods (Heaney et al ., 1986; Talling, 1993, 2002). They are much strengthened by the present correlative analysis based on a 20‐year period with records of both total phytoplankton and larger zooplankton.…”

Section: Discussionmentioning

confidence: 99%

“…4, wherein contours of abundance over seasonal time are compared for phytoplankton (as Chl) and zooplankton (as total count per 2 L). The corresponding graphical comparison for Windermere South Basin over the same period (in Talling, 2002) shows an almost equally immediate succession of vernal phytoplankton to zooplankton maxima.…”

Section: Zooplankton Timing In Relation To Spring Phytoplankton Maximamentioning

confidence: 99%

“…Evidence has been given (Talling, 2002) that the seasonal phytoplankton minimum with zooplankton maximum can also constitute a ‘clear‐water phase’, with a strong increase of light penetration and transparency by Secchi disc. The evidence was taken from Esthwaite Water in 1980 and 1981.…”

Section: The Phytoplankton Minimum As a ‘Clear‐water Phase’mentioning

confidence: 99%

“…For this and other lake basins nearby, there are now improved records of plankton abundance over several decades. I have surveyed those of phytoplankton in terms of chlorophyll a (Chl) concentration during the period 1964–89 (Talling, 1993), and have briefly given evidence that a ‘clear‐water phase’ in early summer ascribable to grazing can result during maxima of crustacean zooplankton (Talling, 2002). The present contribution substantiates, extends and generalizes; it is based mainly on 20 years of observation over three lake basins, among which the timing of the phytoplankton maximum shows systematic differences.…”

Section: Introductionmentioning

confidence: 99%

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Phytoplankton–zooplankton seasonal timing and the ‘clear‐water phase’ in some English lakes

Talling

2002

Freshwater Biology

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SUMMARY 1. An examination is made of the relative seasonal timing of the postwinter increase of phytoplankton and zooplankton populations in four English lake basins. It centres upon weekly sampling over 20 years and rough counts of larger Crustacea, as copepods and cladocerans, from filtered samples that were used for chlorophyll a (Chl) estimation. 2. Typically, a spring maximum of phytoplankton, dominated by diatoms and earlier in the shallower lakes, is accompanied or followed by a maximum of copepods and then one of cladocerans dominated by the Daphnia hyalina–galeata complex. Regarding timing, the maximum of copepods has no apparent relation with phytoplankton abundance (Chl). The maximum of cladocerans appears to be largely independent of variation in the phytoplankton maximum, but is generally associated with a minimum in Chl. Evidence for some direct causality in this inverse correlation after the spring phytoplankton maximum is best displayed by the shallow Esthwaite Water in which the peaks of Chl and cladocerans are separated further than in the deep Windermere basins where phytoplankton growth is delayed. In Esthwaite Water, and possibly often in Windermere, a principal minimum in Chl is ascribable to grazing by Daphnia. 3. The typical inverse relationship of Chl and cladocerans is lost in some years when relatively inedible large phytoplankters (e.g. colonial chrysomonads, filamentous cyanophytes) are abundant and Chl minima are less pronounced, although maxima of cladocerans still occur. Conversely, available edible phytoplankters include various small forms grouped as μ‐algae and Cryptomonas spp.; their probable depletions by Daphnia appear to be sequential and may limit the latter's maxima, whose inception is temperature‐dependent. 4. The spring–summer maxima of cladocerans and minima of Chl are generally coincident with a main seasonal maximum of Secchi disc transparency and light penetration – to which removal of non‐phytoplankton particles by filtering cladocerans may contribute.

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Section: Discussionmentioning

confidence: 99%

Section: Zooplankton Timing In Relation To Spring Phytoplankton Maximamentioning

confidence: 99%

Section: The Phytoplankton Minimum As a ‘Clear‐water Phase’mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Phytoplankton–zooplankton seasonal timing and the ‘clear‐water phase’ in some English lakes

Talling

2002

Freshwater Biology

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“…The primary aim is to interrelate processes of importance in this seasonal transition that have been the focus of separate studies -onset of thermal stratification (Szumiec, 1985), limitation and sedimentation of diatom populations (Lund, 1950(Lund, , 1954, clearwater conditions linked to the grazing of Daphnia (Talling, 2002(Talling, , 2003, a minimum of phytoplankton in the euphotic zone (Talling, 1993), and the development of deep maxima of living phytoplankters (Heaney & Talling, 1980;Heaney et al, 1986;Davis et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

The ‘shock period’: dynamics of phytoplankton during the spring–summer transition of a stratifying English lake

2005

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The spring to summer transition in a productive English lake is considered with respect to phytoplankton and its environmental conditions. Salient environmental changes include the onset of temperature/density stratification that is usually accompanied by a clear-water phase associated with a maximum of grazing Daphnia and a minimum of phytoplankton in the 0-5 m zone. Below this zone, as thermal stratification progresses, a deep maximum of phytoplankton can develop under strong thermal/density gradients and enhanced light penetration. Examples are resolved by estimations of chlorophyll-a, beam attenuance in situ and cell counts. Attributed origins are by sedimentation of diatoms, migration of flagellates, and depthadjusted buoyancy of a gas-vacuolate cyanophyte. The transition period involves a decline of springassociated diatom populations and a rise of summer-associated species. The generally low algal abundance within the transition phase has at least four origins -prior nutrient (Si) depletion, sedimentation, grazing, and low 'inoculum' levels of successor species. It can be augmented by the re-growth of species abundant in spring, by early extensions of normally summer species, by seasonally characteristic colonial chrysophytes, and by other phytoflagellates of small size that are seasonally less specific ('opportunistic') and probably critical for Daphnia grazing with consequent generation of the clear-water phase.

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Freshwater Phytoplankton Ecology: The British Contribution in Retrospect

Talling¹

2012

Freshwater Reviews

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Freshwater phytoplankton — accessible, microbial, influential population dynamics

Cited by 4 publications

References 71 publications

Phytoplankton–zooplankton seasonal timing and the ‘clear‐water phase’ in some English lakes

Phytoplankton–zooplankton seasonal timing and the ‘clear‐water phase’ in some English lakes

The ‘shock period’: dynamics of phytoplankton during the spring–summer transition of a stratifying English lake

Freshwater Phytoplankton Ecology: The British Contribution in Retrospect

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