2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
9/25/2018 | 4:15 PM - 4:30 PM | Expanding the Range of Black Grouse Lyrurus Tetrix in Northern England - Can Wild Females be Successfully Translocated? | Eccles Conference Center Auditorium
Expanding the Range of Black Grouse Lyrurus Tetrix in Northern England - Can Wild Females be Successfully Translocated?
Black grouse were once widespread in England but have declined over the past 150 years due to habitat changes. In 1998, 773 males remained and following the instigation of conservation measures increased to 1026 in 2006, but range remained stable. Range was expanded by translocating males beyond the existing range, resulting in new leks establishing, attraction of females and successful breeding. To establish whether females could also be translocated, 24 were moved and released at one of the male release sites. 20 survived to nest in their first spring on average 1.7 km from the release point. Annual survival averaged 0.81 (0.63-0.90, 95% CL) and was comparable to that of non-moved birds in northern England. Females exhibited fidelity to their breeding areas, nesting 0.2 km from nest sites of the previous year. Of the 35 nests studied, 71% hatched eggs. Brood survival to eight weeks old averaged 29% and the proportion of female that reared broods was 20%. Clutch size, egg volume, nest and brood survival were all comparable with estimates from non-moved birds. Chicks reared per female was poor at an average 0.3 (+ 0.1 SE) and was lower than non-moved birds in northern England. Numbers of males at leks following the cessation of releases males and females in 2014 remained stable, with 12 males in 2015, nine in 2016 and 11 in 2017. Our results that range expansion can be achieved by female translocation, having first moved males and establishing leks.
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Presenters/Authors
Philip Warren
(), Game and Wildlife Conservation Trust, pwarren@gwct.org.uk;
ASHA DISCLOSURE:
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David Baines
(), Game & Wildlife Conservation Trust, dbaines@gwct.org.uk;
ASHA DISCLOSURE:
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Nonfinancial -