+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

The introduced aquatic macrophyte myriophyllum spicatum as habitat for fish and their invertebrate prey

, : The introduced aquatic macrophyte myriophyllum spicatum as habitat for fish and their invertebrate prey. Canadian Journal of Zoology 62(7): 1289-1303

The exotic macrophyte M. spicatum spread widely in Lake Opinicon, Ontario, [Canada] after 1974, dominating the 2.0-3.5 m depth zone which had previously been largely open water. In the shallows it formed beds within the species-rich native Potamogeton-Vallisneria community. Fish and prey-invertebrate abundance and distribution were compared before and after the milfoil invasion for a series of depth zones (1972 relative to 1979-1980) and in communities of M. spicatum relative to native macrophytes in the littoral zone shallows in the summer of 1980. At a depth of 2.0-3.5 m (major M. spicatum zone), there were significantly fewer bluegill but more black crappie and golden shiner in 1979-1980 compared with 1972, and significantly fewer isopods, chironomid and trichopteran larvae and ephemeropteran nymphs. Differences were greatest in late summer. Inshore and offshore from the M. spicatum zone, differences were minor, suggesting that the invader, not time, was responsible. At a 1.0-1.3 m depth in the summer of 1980, 3-4 times as many fish occurred during the daytime feeding periof in the Potamogeton-Vallisneria community than in the M. spicatum area. In the benthos, beneath the native beds, 5 major taxa of prey invertebrates were 3-7 times more abundant. The foliage of Potamogeton plus Vallisneria supported twice as many invertebrates per square meter in late summer than did M. spicatum. Insect emergences over the summer (May-Sept.) were twice as high. Up to the present, the net impact of the habitat change on the fish populations of Lake Opinicon has not been great. If in the future M. spicatum were to replace the rich native macrophyte beds in the shallows, this would be cause for concern.


DOI: 10.1139/z84-186

Other references

Kristan, W.B., 1979: Neuronal changes related to behavioral changes in chronically isolated segments of the medicinal leech. Brain Research 167(1): 215-220

Zimmer Faust R.K.; Case J.F., 1982: Odors influencing foraging behavior of the california usa spiny lobster panulirus interruptus and other decapod crustacea. Trapping experiments were conducted in the More Mesa coastal area of Santa Barbara, California, 4 km east of the U.C. [University of California] Santa Barbara campus. Live intact and injured prey as well as excised tissues were placed in traps, in...

Sutic, D.; Tosic, M.; Starovic, M.; Stankovic, R.; Tomic, T., 2002: O crvenilu kukuruza. A disease labelled redness has been observed for several decades on maize in Serbia, particularly in regions: Banat, Stig and Pomoravlje. Etiology of redness of maize has been variously interpreted. Some researchers interpreted data that disease o...

Dunn, R.D.; Hoffmann, P.; Fouch, F., 1937: Skin and Chemical Tests for Pregnancy. California and Western Medicine 47(5): 315-317

Xu, X-jing.; Zhang, Y-hua.; Sun, H-hui.; Liu, X-yan.; Jiang, Y-wu.; Wu, X-ru., 2013: Genetic and phenotypic characteristics of SCN1A mutations in Dravet syndrome. To study SCN1A gene mutations and their inheritance in patients with Dravet syndrome(DS), and to analyze the phenotypes of their family members and genotype-phenotype correlations. Genomic DNA was extracted from peripheral blood samples from 181 D...

Schiodt, E.; Moltke, O., 1961: Otto MOLTKE: 2/7 1895 - 1/7 1961. Ugeskrift for Laeger 123: 1043-1045

Patil V.N., 1984: Evaluation of 4 cotton genotypes for resistance to field weathering. Four cotton genotypes with distinct seed coat characteristics were evaluated for seed response to moisture fluctuation and viability in relation to field weathering. Impermeable seeds (hard seededness) of LA HS 901 and permeable seeds of STV 213,...

Kobayashi Akio; Yoshida Akio, 2004: Crustal deformation in and extended area after the 1946 Nankai earthquake deduced from tide gauge records. We investigated crustal deformation after the 1946 Nankai earthquake using tide gauge records. Although resolution of tide gauge records is not so high for seeing the temporal change in detail, vertical crustal movements whose relaxation times are...

Bermudez-Santana, C.; Attolini, C.Stephan-Otto.; Kirsten, T.; Engelhardt, J.; Prohaska, S.J.; Steigele, S.; Stadler, P.F., 2010: Genomic organization of eukaryotic tRNAs. Surprisingly little is known about the organization and distribution of tRNA genes and tRNA-related sequences on a genome-wide scale. While tRNA gene complements are usually reported in passing as part of genome annotation efforts, and peculiar fe...

Stillwell, R.J.; Berry, M.J., 2005: Expanding the repertoire of the eukaryotic selenoproteome. Fusarium head blight epidemics of wheat and barley cause heavy economic losses to farmers due to yield decreases and production of mycotoxin that renders the grain useless for flour and malt products. No highly resistant cultivars are available at...