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THE RESTORATION OF WOODS MILL LAKE (2004)

Hayes, E.

Oxford, UK : Blackwell Publishing Ltd

Water and environment journal 18 (2004), S. 0

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ISSN: 1747-6593

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Energy, Environment Protection, Nuclear Power Engineering

Notes: Woods Mill Lake is the centrepiece of a nature reserve at Henfield in Sussex, UK. During the last forty years, the lake has undergone a succession of changes, and this has resulted in loss of depth and encroachment of the reed-bed. In the summer months the large carp population was suffering stress due to shallow water. The problem of silt excavation required extensive discussion with statutory agencies: in addition, the work had to be scheduled around nesting birds, breeding newts and school visits. This paper (a) discusses the complexity of the work which was undertaken, and (b) provides an analysis of the fish population which was removed from the lake.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1747-6593.2004.tb00486.x

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Sperm precedence, mating interval, and a novel mechanism of paternity bias in a beetle (Tenebrio molitor L.) (2000)

Drnevich, J. M. ; Hayes, E. F. ; Rutowski, R. L.

Springer

Behavioral ecology and sociobiology 48 (2000), S. 447-451

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ISSN: 1432-0762

Keywords: Keywords Mating intervals ; Sperm precedence mechanisms ; Spermatophores ; Tenebrio molitor

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Abstract When females mate with more than one male, the ensuing sperm competition leads to the evolution of male mechanisms that skew paternity. Males of the yellow mealworm beetle (Tenebrio molitor) transfer a spermatophore to females during copulation, but sperm release and storage occur later. We investigated how the interval between two matings with different males affects sperm precedence by varying the interval between the copulations so that the second mating was either: (1) before sperm release from the first spermatophore (〈5 min); (2) after sperm release but before spermatophore ejection (15–20 min); (3) after spermatophore ejection but before sperm storage (4 h), or (4) after complete sperm storage (24 h). We collected offspring over a period of 2 weeks and determined paternity by protein electrophoresis. There was second-male sperm precedence in all treatments, but when the interval was 〈5 min, the second male usually (86% of cases) had complete sperm precedence (i.e., P 2=1). Investigations into the mechanism of second-male sperm precedence during 〈5-min mating intervals indicate that sperm release from the first spermatophore is inhibited, a phenomenon which has not been previously documented.