Leeches (Annelida: Hirudinea) in the Experimental Lakes Area, Northwestern Ontario, Canada: Patterns of Species Composition in Relation to Environment

Grantham, Brian A.; Hann, Brenda J.

doi:10.1139/f94-159

Cited by 15 publications

(7 citation statements)

References 17 publications

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“…In general, highest species richness occurred in small eutrophic lakes where as lowest richness was recorded in medium to large lakes with low productivity. Contrary to results for some other taxa, lake pH was not a dominant variable describing only a small amount of variance in the species-environment relationship (Grantham and Hann, 1994). The oligochaete community of the acidified lakes was poorer compared to the neutral ones.…”

Section: Factors Affecting Lake Macroinvertebratescontrasting

confidence: 88%

Macroinvertebrates (oligochaetes) as indicators of pollution: A review

Rashid¹,

Pandit²

2014

J. Ecol. Nat. Environ.

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Macroinvertebrates formed an important constituent of an aquatic ecosystem and had functional importance in assessing the trophic status as the abundance of benthic fauna mainly depends on physical and chemical properties of the substratum and thus the benthic communities respond to changes in the quality of water and available habitat. This review discussed the occurrence, composition and distribution of macroinvertebrates of lakes and wetlands, and some environmental factors which regulated their occurrence and distribution. Also, analysis of the benthic community helped in the determination of trophic status of lakes because of their sensitivity to pollution and is, therefore, an important criterion in the ecological classification of lakes.

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Section: Factors Affecting Lake Macroinvertebratescontrasting

confidence: 88%

Macroinvertebrates (oligochaetes) as indicators of pollution: A review

Rashid¹,

Pandit²

2014

J. Ecol. Nat. Environ.

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“…CCA is a constrained ordination technique that incorporates the unimodal response of species to environmental variables. Linear combinations of environmental variables are selected to produce maximum separation of the species' distribution in the ordination space (ter Braak and Prentice 1988, Poulin et al 1993, Grantham and Hann 1994. In this analysis, the species data consisted of the count of individuals in each species at a point, adjusted for detectability based on the method of variable circular plots, and summed over all days.…”

Section: Discussionmentioning

confidence: 99%

“…The longer the arrow, the greater the correlation between the variable and the ordination axes and, hence, the greater that variable's influence in explaining the pattern of community variation. This also indicates the variable's relative predictive ability (ter Braak 1986, Grantham andHann 1994). (b) CCA ordination of species and environmental measures.…”

Section: + +mentioning

confidence: 99%

Land Use and Avian Species Diversity Along an Urban Gradient

Blair

1996

Ecological Applications

1,231

941

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Abstract. I examined the distribution and abundance of bird species across an urban gradient, and concomitant changes in community structure, by censusing summer resident bird populations at six sites in Santa Clara County, California (all former oak woodlands). These sites represented a gradient of urban land use that ranged from relatively undisturbed to highly developed, and included a biological preserve, recreational area, golf course, residential neighborhood, office park, and business district.The composition of the bird community shifted from predominantly native species in the undisturbed area to invasive and exotic species in the business district. Species richness, Shannon diversity, and bird biomass peaked at moderately disturbed sites. One or more species reached maximal densities in each of the sites, and some species were restricted to a given site. The predevelopment bird species (assumed to be those found at the most undisturbed site) dropped out gradually as the sites became more urban. These patterns were significantly related to shifts in habitat structure that occurred along the gradient, as determined by canonical correspondence analysis (CCA) using the environmental variables of percent land covered by pavement, buildings, lawn, grasslands, and trees or shrubs. I compared each formal site to four additional sites with similar levels of development within a two-county area to verify that the bird communities at the formal study sites were representative of their land use category.

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“…They are well known because of the sanguivorous habits of some taxa; however, leeches that are opportunistic predators of microinvertebrates (Davies et al, 1981;Young, 1981) are far more abundant in freshwater lakes and streams than are blood-feeders. Because of their abundance in some habitats, leeches have been used as environmental stress indicators in freshwater ecosystems (Klemm, 1991;Grantham and Hann, 1994). The parasitic leech taxa are important vectors of blood parasites among aquatic vertebrates, both in freshwater and in marine environments Desser, 1991, 1993;Burreson, 1994).…”

Section: Introductionmentioning

confidence: 99%