Influence of Lake pH and Macrograzers on the Distribution and Abundance of Nuisance Metaphytic Algae in Ontario, Canada

Welbourn, Pamela

doi:10.1139/f92-022

Cited by 23 publications

(10 citation statements)

References 21 publications

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“…The precise location, pH, and total phosphorus concentrations of these lakes are provided elsewhere France & Welbourn, 1991,1992. Modified minnow traps (enlarged openings; painted black) were set in 36 lakes between June 20 and August 4, 1988.…”

Section: Methodsmentioning

confidence: 99%

Influence of lake pH on the distribution, abundance and health of crayfish in Canadian Shield lakes

France

1993

Hydrobiologia

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Thirty-six softwater lakes in central Ontario were sampled during 1988 to determine the relationship between lake pH and ecology of resident crayfish populations. The distribution and relative abundance of crayfish was found to depend upon lake pH. Sublethal acidification stress was also reflected by a decrease in carapace rigidity of Orconectes spp. No evidence of microsporidosis was detected. These results support previous population-specific research in demonstrating the marked sensitivity of crayfish to lake acidification below pH 6.0.There are few multi-lake surveys of the abundance of crayfish in North American lakes (Collins etal.

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Section: Methodsmentioning

confidence: 99%

Influence of lake pH on the distribution, abundance and health of crayfish in Canadian Shield lakes

France

1993

Hydrobiologia

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“…Crayfish are often implicated in causing reductions of filamentous algae or periphyton (Flint and Goldman, 1975;France and Welbourne, 1992;Charlebois and Lamberti, 1992). "When P. clarkii and P. zonangulus were fed filamentous algae (Spirogyra), they showed little or no growth (Sanguanruang, 1988).…”

Section: Algaementioning

confidence: 99%

Redefining the role of crayfish in aquatic ecosystems

Momot

1995

Reviews in Fisheries Science

443

289

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“…35 -38). Simple random sampling is inefficient because nearshore substrates are heterogeneous and crayfish abundance varies with substrate type and water depth (Rabeni 1985;Somers and Stechey 1986;Davies 1989;France and Welbourn 1992). Fifty-metre segments of lake shoreline with predominantly rocky substrates in the shallows were identified on maps while snorkelling.…”

Section: Cray$sh Samplingmentioning

confidence: 99%

“…each of these three sections of lake shoreline to ensure that the traps were distributed around the entire lake. France and Welbourn (1992) used a similar sampling design to survey crayfish, tadpoles, and metaphytic algae in 36 lakes in south-central Ontario.…”

Section: Cray$sh Samplingmentioning

confidence: 99%

Seasonal patterns in trap catches of the crayfish Cambarus bartoni and Orconectes virilis in six south-central Ontario lakes

Somers¹,

Green²

1993

Can. J. Zool.

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SOMERS, K.M., and GREEN, R.H. 1993. Seasonal patterns in trap catches of the crayfish Cambarus bartoni and Orconectes virilis in six south-central Ontario lakes. Can. J. Zool. 71: 1136-1145. Crayfish were trapped in six south-central Ontario lakes to examine seasonal changes in estimates of relative abundance. Baited-trap catches of Cambarus bartoni and Orconectes virilis correlated with changes in water temperature. Cambarid catches increased in the spring until a midsummer maximum, but dropped suddenly as the water temperature began to fall in August. Ovigerous (i.e., egg-bearing) females and recently moulted males were captured by SCUBA divers in August. Trap catches increased, once breeding and moulting periods concluded, and subsequently decreased as water temperatures continued to drop in the autumn. In contrast, catches of male 0 . virilis increased in the spring and remained relatively constant throughout the summer until water temperatures fell in September. Catches of female 0 . virilis peaked somewhat later in the summer and then gradually declined in the early fall. Although the two species and the two sexes differed in the length of the midsummer sampling period when trap catches were relatively constant, similar seasonal trends among lakes suggest that midsummer trap catches can be used to estimate crayfish relative abundance. Other factors, such as the presence of smallmouth bass (Micropterus dolomieui), lake physical and chemical characteristics, and the number of co-occurring crayfish species also correlated with trap catches. Both the presence of bass and the number of co-occurring species of crayfish probably affect crayfish behaviour and activity, thereby reducing catches in baited traps, but not necessarily affecting actual population abundance. Comparisons of relative abundance based on catches from baited traps must control for these seasonal behavioural, and environmental factors. SOMERS, K.M., et GREEN, R.H. 1993. Seasonal patterns in trap catches of the crayfish Cambarus bartoni and Orconectes virilis in six south-central Ontario lakes. Can. J. Zool. 71 : 1 136 -1 145.La capture par pikgeage a permis d'estimer les fluctuations saisonnikres de l'abondance des kcrevisses dans six lacs du centre sud de I'Ontario. Le nombre de Cambarus bartoni et d'orconectes virilis captures dans des pikges appitks variait en fonction de la temperature de l'eau. Le nombre de cambaridks dans les pikges a subi une augmentation au printemps pour atteindre un sommet au milieu de l'ktk, mais a diminuk brusquement lorsque la tempkrature de l'eau s'est mise h baisser au mois d'aout. Des femelles ovigkres (i.e. porteuses d'oeufs) et des miles qui venaient de muer ont kt6 capturks lors de plongCes SCUBA en aodt. Les captures dans les pikges ont augment6 aprks les pCriodes de reproduction et de mue et ont diminuk par la suite h mesure que la temperature continuait sa chute h l'automne. En revanche, le nombre d'O. virilis miles a augment6 au printemps et est demeurk relativement constant durant tout l'ktk, jusqu'h la...

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Influence of Lake pH and Macrograzers on the Distribution and Abundance of Nuisance Metaphytic Algae in Ontario, Canada

Cited by 23 publications

References 21 publications

Influence of lake pH on the distribution, abundance and health of crayfish in Canadian Shield lakes

Influence of lake pH on the distribution, abundance and health of crayfish in Canadian Shield lakes

Redefining the role of crayfish in aquatic ecosystems

Seasonal patterns in trap catches of the crayfish Cambarus bartoni and Orconectes virilis in six south-central Ontario lakes

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