Maksteņu kāpuru (Trichoptera) sabiedrību ekoloģija Latvijas vidēja lieluma ritrāla tipa upēs
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Latvijas Universitāte
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Abstract
Maksteņu kāpuru (Trichoptera) sabiedrību ekoloģija Latvijas vidēja lieluma
ritrāla tipa upēs
Anotācija
Veikta maksteņu Trichoptera kāpuru sabiedrību telpiskā sadalījuma izpēte Latvijas
vidēja lieluma ritrāla tipa upēs, pielietojot hierarhisku paraugu ievākšanas shēmu un
piemērotākās statistiskās metodes. Būtiskas atšķirības konstatētas starp īpatņu
blīvumu upju augštecēs un lejtecēs. Vislielākā ietekme uz maksteņu sabiedrībām bija
lokālajiem faktoriem un sateces baseina lielumam. Reofīlās sabiedrības, upju posmos
ar oļu un akmens mikrobiotopiem, atšķīrās no sabiedrībām mikrobiotopos ar smalkas
frakcijas minerālajiem substrātiem, bagātiem ar detrītu. Galvenais maksteņu barības
avots bija perifitons. Maksteņu driftam raksturīga sezonālā dinamika, nav būtiskas
atšķirības starp drifta blīvumu diennakts gaišajā un tumšajā periodā. Straujtecēs
nenotika būtisks drifta blīvuma pieaugums. Drifts būtiski ietekmē atsevišķu sugu
mikroizplatību.
Atslēgas vārdi: makstenes Trichoptera, vidēja lieluma upes, telpiskais sadalījums,
mikrobiotopi, drifts
Caddisfly (Trichoptera) community ecology in the medium-sized rhythral type streams in Latvia Abstract Spatial pattern of caddisfly Trichoptera communities was studied in the medium-sized lowland streams in Latvia, using hierarchical sampling design and appropriate statistical methods. Significant difference was found between the abundance in the upper and the lower stream reaches. Local scale factors and catchment area impacted caddisfly communities the most significantly. Reophilous communities, which inhabit various size lithal microhabitats, differed from the communities in the substrates with smaller grain size and rich with detritus. Periphyton was the main food recourse. Caddisfly drift showed the characteristic seasonal dynamics. Diurnal drift dynamic pattern was not found. The riffles did not contribute to the drift density significantly. Drift influenced the microdistribution of particular caddisfly species. Key words: caddisflies Trichoptera, medium-sized lowland streams, spatial scale, microhabitats, drift
Caddisfly (Trichoptera) community ecology in the medium-sized rhythral type streams in Latvia Abstract Spatial pattern of caddisfly Trichoptera communities was studied in the medium-sized lowland streams in Latvia, using hierarchical sampling design and appropriate statistical methods. Significant difference was found between the abundance in the upper and the lower stream reaches. Local scale factors and catchment area impacted caddisfly communities the most significantly. Reophilous communities, which inhabit various size lithal microhabitats, differed from the communities in the substrates with smaller grain size and rich with detritus. Periphyton was the main food recourse. Caddisfly drift showed the characteristic seasonal dynamics. Diurnal drift dynamic pattern was not found. The riffles did not contribute to the drift density significantly. Drift influenced the microdistribution of particular caddisfly species. Key words: caddisflies Trichoptera, medium-sized lowland streams, spatial scale, microhabitats, drift