Eur. J. Entomol. 101 (1): 57-62, 2004 | DOI: 10.14411/eje.2004.013

Host-plant specialisation and habitat restriction in an endangered insect, Lycaena dispar batavus (Lepidoptera: Lycaenidae) II. Larval survival on alternative host plants in the field

Lynn A. MARTIN1, Andrew S. PULLIN2
1 Department of Life Sciences, Keele University, Staffs ST5 5BG, UK
2 School of Biosciences, The University of Birmingham, Edgbaston, Birmingham B15 2TT, UK

The Large Copper butterfly, Lycaena dispar batavus, is extinct in Britain and rapidly declining in Europe, due predominantly to loss of its wetland habitats. Northern populations have more specialised foodplant and habitat requirements than their more southerly counterparts and rely solely on Rumex hydrolapathum, the Great Water Dock, as their hostplants. Southern colonies use a greater range of Rumex. Previous work has shown that specialisation is not due to foodplant chemistry and in this paper we investigate the ability of different Rumex species to support the larval stages of L. d. batavus in a natural environment. Comparisons were also made between a captive colony at Woodwalton Fen, Cambridgeshire, UK and native larvae at De Weerribben, Netherlands. Field experiments using a captive colony revealed that other Rumex hosts can successfully support larvae throughout each of their larval stages in wet grassland and fenland habitats with no significant differences in survival rates compared with their natural hostplant R. hydrolapathum. An overwintering experiment using a native wild population of both butterfly and Rumex species in De Weerribben found 25% of larvae survived on the natural hostplant R. hydrolapathum and no survivors on alternative Rumex hosts. It is suggested that R. crispus and R. obtusifolius growing in their natural habitat may harbour significant competitors to L. d. batavus leading to its specialisation on R. hydrolapathum in fenland habitats.

Keywords: Butterfly ecology, larval survival, Rumex, fenland, competitive exclusion

Received: August 12, 2003; Revised: November 27, 2003; Accepted: November 30, 2003; Published: March 25, 2004  Show citation

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MARTIN, L.A., & PULLIN, A.S. (2004). Host-plant specialisation and habitat restriction in an endangered insect, Lycaena dispar batavus (Lepidoptera: Lycaenidae) II. Larval survival on alternative host plants in the field. EJE, 101(1), 57-62. doi: 10.14411/eje.2004.013
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