Bat Exploitation of Sitka Spruce Plantations: Impacts of Management on Bats and Nocturnal Invertebrates

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Bat Exploitation of Sitka Spruce Plantations: Impacts of Management on Bats and Nocturnal Invertebrates Bat exploitation of Sitka Spruce plantations: Impacts of management on bats and nocturnal invertebrates Lucinda Kirkpatrick Biological and Environmental Sciences School of Natural Sciences University of Stirling October 2016 i Declaration I hereby declare that this thesis has been completed by myself, and it embodies the results of my own research. Where appropriate, I have acknowledged the nature and extent of work carried out in collaboration with others. ……………………………………………………………………. Lucinda Kirkpatrick ii Summary Plantations are widespread throughout temperate regions, and the area of plantation land cover is predicted to get larger in the future. Interest in ensuring sustainable plantation management is also growing, as it is increasingly recognised that productive areas should play a role in biodiversity conservation. Plantation landscapes can comprise the majority of forested cover in some countries, but taxon-specific guidance can be lacking, due to plantations often being under surveyed. Therefore, despite substantial incentives existing to ensure that plantations meet various ecological criteria, plantation managers lack the information necessary to implement effective management plans. Many bat species have undergone widespread declines in recent decades, attributed to habitat loss and fragmentation, particularly of forested habitat. In many temperate countries, historical deforestation has resulted in very low native tree cover, and subsequently, considerable replanting with non-native commercial coniferous plantations has taken place. Species specific habitat surveys have often demonstrated avoidance of conifer plantations by bats, which has been attributed to a lack of roosts and low invertebrate prey abundance. Furthermore, widespread lepidopteran declines have been partly attributed to afforestation with non-native conifer, but moth associations with commercial coniferous plantations are usually only studied for pest species. Bats present a particular challenge in plantation landscapes; tree cover is important to many species to a greater or lesser extent, and in the United Kingdom, destruction of a roost site is illegal, regardless of whether it was deliberate or accidental. However, the extent to which bats associate with non-native commercial plantations is relatively unexplored. This is the first study to explicitly test bat associations with Picea sitchensis plantations (using acoustic detectors, trapping and radio tracking), and shows that, contrary to expectations, they may be an important habitat for breeding populations of Pipistrellus spp., particularly P. pygmaeus. High levels of activity were recorded for both P. pygmaeus and P. pipistrellus, despite little difference in dipteran abundance between different stand types, both species preferentially foraged in felled or less dense stands. This suggests that bats preferentially forage in areas with less acoustic and physical clutter, which will increase foraging efficiency. The impacts of felling in non-native commercial coniferous plantations on foraging activity was tested, for the first time, using a Before – After – Control – Impact experimental design. Bat activity (specifically P. pipistrellus and Nyctalus) increased after felling, particularly in smaller stands. In contrast felling had significant, negative impacts on moth abundance, species richness and diversity, and these effects remain after constraining for functional trait similarity. Reductions in richness and diversity in response to felling were similarly large for both rare and abundant species. Therefore, while bats may benefit from clear fell practices, albeit as long as the size of patches is small, moth populations could benefit from a shift towards other forestry methods, iii such as continuous cover forestry. These results also have implications for the recent, but increasing practice of siting wind turbines in commercial coniferous plantations, as pre-installation preparation involves clearing small patches of forest which may attract foraging bats; post felling monitoring should be carried out to examine potential impacts on bat populations. The presence of broadleaf trees in and around plantations significantly increased moth richness, mostly through increased occurrence of rare species. Broadleaf woodlands (defined as land spanning more than 0.5 ha, with trees higher than 5m and a combined cover of shrubs, bushes and trees above 10%), also had higher functional redundancy than plantation sites. For a diverse moth population to persist in plantation landscapes, preserving remnant patches of broadleaf trees is essential. There was little difference in bat activity between broadleaf woodlands and plantation sites. However, bat abundance, particularly that of reproductively active females, was greater in broadleaf sites compared to plantations. This was particularly true for Myotis and Nyctalus spp., very few of which were trapped in commercial plantations. Therefore, although reproductively active female Myotis bats are present in the surrounding landscape, they do not appear to associate with plantations themselves. This may reflect a lack of roost availability; both P. pygmaeus and P. pipistrellus preferentially form large maternity colonies in buildings, but for Myotis and Nyctalus spp. which roost switch regularly and often use trees, it is unlikely many suitable roosts exist within the plantations themselves. Many substantial P. pygmaeus maternity colonies were identified in and around Galloway forest, with some holding more than 500 individuals. All maternity colonies were in buildings, and most inhabited (and one uninhabited) buildings within the plantation contained a roost. Although females occasionally used old or dead deciduous trees as temporary roosts, there was no evidence of roosting in crop trees such as P. sitchensis. During this study, the Forestry Commission installed 36 bat boxes; within 6 months over 90% had been used, with a number of harems found inside. This fast uptake compared with bat use of boxes in other locations reflects the paucity of appropriate structures for either roost or harem use in commercial plantations. Twelve bats were captured while foraging, tagged with small radio transmitters, and followed for between 2 and 6 nights during 2014 and 2015. All but one tagged female preferentially foraged within the plantation, with individuals selecting equally riparian habitats and felled stands. Tagged females which roosted furthest from the plantation had the largest home ranges; one individual flew nearly 40km each night to reach foraging areas distant from her roost, suggesting that the food availability within the plantation was sufficient to render such a long journey energetically viable. iv These results have important implications for bat populations in and around commercial coniferous plantations. Far from being avoided by bats, plantation landscapes may constitute an important habitat type for both P. pygmaeus and P. pipistrellus, likely due to the high abundance of nematoceran diptera in plantation woodlands. Furthermore, plantation forests support a similar richness of moth species to urban and agricultural woodlands, including a number of declining species of special conservation concern. A list of management recommendations to benefit both bat and moth populations in commercial plantations is presented at the end of this thesis. v Acknowledgements As always, this PhD would not have been possible without the support, advice and input of a lot of people, many of whom gave up a lot of time to either listen to me waffle on about bats, or spend what sometimes felt like endless nights slowly going mad with the hum of thousands (millions?!) of midges. First and foremost, I need to thank my supervisors, especially Kirsty Park. Thank you for your support, advice, and encouragement, and for also telling me when to stop fiddling and just start writing. I have learnt an incredible amount during the course of this PhD, and a lot of it has come from you. I have been very lucky to have you as a supervisor, you have always been available for me to ask sometimes daft questions of, and supported me when I decided on rather ambitious surveying plans. Here’s to more Zombies in the future! I am also very grateful to Sallie Bailey, who has given me invaluable insight into the forestry world, and been immensely supportive with the equipment needed to carry out this work. Daisy Dent has also provided statistical advice, experimental planning and support. I have been very fortunate to have been supervised by three talented and inspiring women. My many field assistants and interns all deserve a huge thank you, giving up entire summers to live in the woods, catching bats and mostly being eaten alive by midges. Sarah Maher, Lynn Munro, Max Scoarize, Jen Graham, Liz Ferrell, Gill Birtles, John Oates, Sean McGregor, Clara Gajas, I am incredibly grateful to you all. It was incredibly hard work and you were all fantastic – there were moments of true brilliance which I will never forget, and I wish you all every success in the future. Zeltia, Fanny, Mel and Isobel, your work helping id seemingly endless bat calls and invertebrates was hugely appreciated, I could not have done it without you. So thank you all. Various bat ecologists, Forestry Commission staff and others have helped me along the way. It has been a pleasure, and a real insight to work with foresters that care so much about the state and condition of their forests, and the biodiversity within. Sitka
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