Relationship between littoral grazers and metaphytic algae in five softwater lakes

France, Robert; Howell, E. Todd; Paterson, Michael; Welbourn, Pamela

doi:10.1007/bf00017488

Cited by 24 publications

(9 citation statements)

References 76 publications

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“…Taxa were identified to order as in France (1995 a ). A list of dominant family and generic levels for littoral macroinvertebrates in Canadian Shield lakes is provided in France et al (1991).…”

Section: Wood Breakdown and Colonizationmentioning

confidence: 99%

Macroinvertebrate Colonization of Woody Debris in Canadian Shield Lakes following Riparian Clearcutting

France

1997

Conservation Biology

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Deployment of litterfall traps revealed that clearcut logging of boreal riparian forests in northwestern Ontario, Canada resulted in a dramatic shift from once dominant conifers to regrowth composed largely of deciduous trees and reduced the allochthonous inputs of small woody debris to lake littoral zones by over 90%. Due to the rarity of macrophytes in these oligotrophic lakes, littoral macroinvertebrates were found to actively colonize woody debris placed within mesh litter bags. The recalcitrant nature of small woody debris in these lakes (average median persistence time of about 5 years estimated from mass loss data) indicates, however, that this important habitat resource will probably never completely disappear in relation to its projected rate of resupply during post‐disturbance forest regeneration. Colonization rates of twigs and bark contained within the litter bags were not found to differ between coniferous and deciduous species. This indicates that macroinvertebrates in these boreal lakes are merely opportunistic colonizers of woody debris, probably for its use as either a biofilm substrate or a predation refuge. As a result, shifts in tree species composition following riparian clearcutting should not detrimentally affect the taxa richness or organism abundance of aquatic macroinvertebrates in these lakes.

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Section: Wood Breakdown and Colonizationmentioning

confidence: 99%

Macroinvertebrate Colonization of Woody Debris in Canadian Shield Lakes following Riparian Clearcutting

France

1997

Conservation Biology

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“…The study of littoral communities in acidic lakes ( Turner et al , 1987, 1991, 1995a, b, c ; Howell et al , 1990 ; France et al , 1991 ; Webster et al , 1992 ; Paterson, 1993) has only recently begun, in part due to the complexity of this region and attendant sampling difficulties. Microcrustacea (Cladocera and Copepoda) inhabit diverse substrata, including macrophytes, sediments and rock surfaces, as well as the water column ( Whiteside, Williams & White, 1978; Paterson, 1993).…”

Section: Introductionmentioning

confidence: 99%

Littoral microcrustacea in Lake 302S in the Experimental Lakes Area of Canada: acidification and recovery

Hann¹,

Turner²

2000

Freshwater Biology

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Summary The littoral microcrustacean community (Cladocera and Copepoda) was examined from 1989 to 1991 in a lake experimentally acidified to pH 4.5, and from 1992 to 1997 during the early stages of pH recovery. Cladoceran abundance declined significantly from 1989 to 1991 (pH 4.5), but species richness did not change. Acantholeberis curvirostris, Simocephalus serrulatus, Latona spp. (Latona setifera, L. parviremis), and all species of chydorid Cladocera declined markedly in abundance while at pH 4.5. The abundance of cyclopoid copepods was low and Ceriodaphnia and calanoid copepods were absent. Recovery of the community was subsequently monitored as pH was incrementally changed to a target pH 5.1 in 1992 and 1993, and to 5.8 in 1994–97. Species richness remained unchanged. Chydorid cladocerans remained at low abundance in 1992, and only Chydorus cf. brevilabris increased substantially from 1993 to 1996. Non‐chydorid Cladocera increased in abundance in 1992, declined again in 1993, then gradually increased (mainly due to Ophryoxus gracilis) in 1994–96. All species declined in 1997 as minnows recolonized the lake. The calanoid copepod Leptodiaptomus minutus was present in low numbers in 1997. The microcrustacean community in the littoral zone of Lake 302S has not yet shown consistent signs of recovery from acidification.

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“…In contrast, field surveys document that acidification results in species replacements (Turner et al 1987;Howell et al 1990;Nichols et al 1992), although not necessarily a decline in production (Shearer and DeBruyn 1986; but see Turner et al 1987). In principle, trophic interactions within the food web could lead to either increase or decrease phytoplankton and periphyton abundance, depending on whether predators or prey species are more strongly influenced by acidification events (e.g., Schindler et al 1985;France et al 1991;Appelberg et al 1993). Acidification also reduces the availability of dissolved inorganic carbon (DIC) and photosynthesis by periphyton (e.g., Turner et al 1994Turner et al , 1995aVinebrooke 1996).…”

mentioning

confidence: 99%

Algal responses to dissolved organic carbon loss and pH decline during whole‐lakeacidification: Evidence from paleolimnology

Leavitt

Findlay

Hall

et al. 1999

Limnology & Oceanography

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Fossil pigment analyses and 19 year-long historical records were used to quantify whole-lake algal response to changes in optical and chemical properties following experimental acidification of Lake 302 with H 2 SO 4 (south basin, 302S; 1981-1989) or HNO 3 (north basin, 302N; 1982-1986) and HCl (1987HCl ( -1989. Undisturbed sediments were collected by freeze-coring, sectioned in approximately annual intervals, and analyzed for fossil carotenoids, chlorophylls, and derivatives by high performance liquid chromatography. Concentrations of fucoxanthin (diatoms, chrysophytes, some dinoflagellates) were correlated with algal standing crop (r 2 ϭ 0.67, P Ͻ 0. 05; 1978-1989) and increased 6-fold following acidification of Lake 302S with H 2 SO 4 from pH 6.6 to 5.0, consistent with observed reductions in dissolved organic carbon (DOC) from 7 to 4.5 mg liter Ϫ1 , improved water clarity, and increased biomass of deep-water chrysophytes. However, fucoxanthin concentrations declined to baseline values in sediments from 1988 to 1990, concomitant with severe acidification to pH 4.5, continued DOC loss (Ͻ1.5 mg liter Ϫ1 ) and an estimated 8-fold increase in the penetration of UVb radiation (UVR-b). Increased penetration of ultraviolet radiation (UVR) was recorded also by increased relative abundance of pigments characteristic of UVR-transparent environments. In contrast, pigments from green algae (Chl b, pheophytin b, lutein-zeaxanthin) doubled during acidification with H 2 SO 4 , while those from cryptophytes (alloxanthin) were unaffected and diatoxanthin from diatoms declined. Patterns of ubiquitous ␤-carotene, Chl a, and pheophytin a suggested that total algal biomass increased ϳ200-400% by the mid-1980s, but declined to near-baseline under severe acidification. Variance partitioning using redundancy analysis captured 80-83% of variation in fossil chlorophylls and carotenoids and suggested that the direct effects of pH were greater (ϳ50% of total variance) than those of irradiance (ϳ12%), but that ϳ20% of variance was attributable to factor interactions. Fossil concentrations of pigments from green algae and diatoms increased ϳ100% following acidification of Lake 302N to pH 6.1, but there were few signals of deep-water blooms, possibly because DOC remained 3.5-5.0 mg liter Ϫ1 . Such complex interactions between pH, DOC, and light may help explain the high variability of algal biomass response to lake acidification. Lake acidification can impact algal communities through both biotic and abiotic pathways (Fig. 1). To date, most research has focused on the direct effects of pH or associated factors (e.g., metals) on members of aquatic food webs (reviewed by Stokes 1986). Laboratory and field experiments

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Relationship between littoral grazers and metaphytic algae in five softwater lakes

Cited by 24 publications

References 76 publications

Macroinvertebrate Colonization of Woody Debris in Canadian Shield Lakes following Riparian Clearcutting

Macroinvertebrate Colonization of Woody Debris in Canadian Shield Lakes following Riparian Clearcutting

Littoral microcrustacea in Lake 302S in the Experimental Lakes Area of Canada: acidification and recovery

Algal responses to dissolved organic carbon loss and pH decline during whole‐lakeacidification: Evidence from paleolimnology

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