HR: 10:30h
AN: NB52C-01    [Abstracts]
TI: Landscape, Population Structure and Genetic Relatedness in two Contrasting Caddisflies
AU: * Hildrew, A G
EM: a.hildrew@qmul.ac.uk
AF: Queen Mary, University of London, School of Biological Sciences, Mile End Road, London, E1 4NS United Kingdom
AU: Wilcock, H R
AF: Queen Mary, University of London, School of Biological Sciences, Mile End Road, London, E1 4NS United Kingdom
AU: Wilcock, H R
AF: University of Hull, Department of Biological Sciences, Cottingham Road, Hull, HU6 7RX United Kingdom
AU: Nichols, R R
AF: Queen Mary, University of London, School of Biological Sciences, Mile End Road, London, E1 4NS United Kingdom
AU: Bruford, M W
AF: Cardiff University, School of Biosciences, Cathays Park, Cardiff, CF10 3XQ United Kingdom
AB: We used microsatellite markers to examine the genetic relatedness of populations of two polycentropodid caddisflies over substantial areas of Great Britain. One (the small-bodied Polycentropus flavomaculatus) is found in large, continuous populations in larger streams and rivers, while the other (the large-bodied Plectrocnemia conspersa) is found in small, fragmented larval habitats in the extreme headwaters. In P. flavomaculatus, populations were genetically distinct between almost all pairs of sites, suggesting limited dispersal by adults between rivers. In P. conspersa, on the other hand, populations were homogenous in lowland England over distances approaching 100km, inferring widespread adult dispersal. In upland north-western England, however, P conspersa populations were more distinct in a landscape where streams are separated by land of higher altitude. This infers that high relief may act as a barrier to adult dispersal. Other evidence suggests that there may be other barriers to adult dispersal through the landscape, beyond the effect of high ground alone, that could disrupt dispersal by the adults of species living in patchily distributed larval habitats
DE: 9810 New fields (not classifiable under other headings)
SC: North American Benthological Society [NB]
MN: 2005 Joint Assembly