Tree use by koalas after timber harvesting in a mosaic landscape
Bradley Law
A * , Chris Slade B , Leroy Gonsalves A , Traecey Brassil A , Cheyne Flanagan C and Isobel Kerr A
A NSW Primary Industries, Forest Science, Parramatta, NSW, Australia.
B Forestry Corporation of NSW, Wauchope, NSW, Australia.
C Port Macquarie Koala Hospital, PO Box 236, Port Macquarie, NSW, Australia.
Wildlife Research 50(7) 581-592 https://doi.org/10.1071/WR22087
Submitted: 20 May 2022 Accepted: 12 September 2022 Published: 27 September 2022
© 2023 The Author(s) (or their employer(s)). Published by CSIRO Publishing
Abstract
Context: A better understanding of how individual animals use their habitat after disturbance can help optimise management practices for their conservation. Forestry is one such disturbance for koalas that operates under regulations based on best available information to minimise impacts.
Aims: This study aimed to investigate tree use by koalas in a mosaic of young, regenerating trees after timber harvest and mature trees in adjacent exclusion zones.
Methods: Tracking collars using very high frequency radio and Global Positioning System transmitters were used to track 10 koalas (five males, five females) across all seasons in three forests, 5–10 years after timber harvesting as regulated by practices current at that time. Tree use was compared to availability based on basal area in different parts of the forest.
Key results: We tracked koalas to 429 day-trees and 70 night-trees during this time. Males and females displayed little difference in tree use. Blackbutt Eucalyptus pilularis and turpentine Syncarpia glomulifera were the most commonly used species during the day, but blackbutt was ranked with the highest preference relative to tree availability. Tallowwood Eucalyptus microcorys was by far the most commonly used tree at night. Koalas used a broad range of tree sizes during the day and night, but most often used medium-sized trees, with preferences for a diameter of 30–60 cm (slightly smaller at night). Koalas used all topographic positions in the landscape, but more than half of the trees used were in lower topographic areas (gullies and lower slopes). Areas mapped as having previous heavy timber harvesting were the most used forest category, followed by riparian exclusion zones.
Conclusions: Our results demonstrate that koalas commonly used trees regenerating after harvest, although preferences for medium-sized trees and tallowwood as a night browse tree suggest current forestry regulations can be fine-tuned by retaining a greater proportion of these features.
Implications: Because most trees were used only once, our results support the view and current practice of retaining habitat patches, such as exclusion zones and wildlife clumps (triggered by a koala habitat model), to provide a mix of species and size classes for both food and shelter. A review of tree size and species retention is recommended.
Keywords: browse trees, forestry, forests, GPS-tracking, habitat selection, koala, timber harvesting, tree-use.
References
Aebischer, NJ, Robertson, PA, and Kenward, RE (1993). Compositional analysis of habitat use from animal radio-tracking data. Ecology 74, 1313–1325.| Compositional analysis of habitat use from animal radio-tracking data.Crossref | GoogleScholarGoogle Scholar |
Ashman, KR, Rendall, AR, Symonds, MRE, and Whisson, D (2020). Understanding the role of plantations in the abundance of an arboreal folivore. Landscape and Urban Planning 193, 103684.
| Understanding the role of plantations in the abundance of an arboreal folivore.Crossref | GoogleScholarGoogle Scholar |
Calenge C (2020) Package ‘adehabitatHS’, Version 0.3.15. Available at https://cran.r-project.org/web/packages/adehabitatHS/adehabitatHS.pdf
Clifton, ID, Ellis, WAH, Melzer, A, and Tucker, G (2007). Water turnover and the northern range of the koala (Phascolarctos cinereus). Australian Mammalogy 29, 85–88.
| Water turnover and the northern range of the koala (Phascolarctos cinereus).Crossref | GoogleScholarGoogle Scholar |
Cristescu, RH, Rhodes, J, Frére, C, and Banks, PB (2013). Is restoring flora the same as restoring fauna? Lessons learned from koalas and mining rehabilitation. Journal of Applied Ecology 50, 423–431.
| Is restoring flora the same as restoring fauna? Lessons learned from koalas and mining rehabilitation.Crossref | GoogleScholarGoogle Scholar |
Crowther, MS, Lunney, D, Lemon, J, Stalenberg, E, Wheeler, R, Madani, G, Ross, KA, and Ellis, M (2014). Climate-mediated habitat selection in an arboreal folivore. Ecography 37, 336–343.
| Climate-mediated habitat selection in an arboreal folivore.Crossref | GoogleScholarGoogle Scholar |
Davies, N, Gramotnev, G, Seabrook, L, McAlpine, C, Baxter, G, Lunney, D, and Bradley, A (2014). Climate-driven changes in diet composition and physiological stress in an arboreal folivore at the semi-arid edge of its distribution. Biological Conservation 172, 80–88.
| Climate-driven changes in diet composition and physiological stress in an arboreal folivore at the semi-arid edge of its distribution.Crossref | GoogleScholarGoogle Scholar |
Ellis, WAH, Melzer, A, Green, B, Newgrain, K, Hindell, MA, and Carrick, FN (1995). Seasonal-variation in water flux, field metabolic-rate and food-consumption of free-ranging koalas (Phascolarctos-Cinereus). Australian Journal of Zoology 43, 59–68.
| Seasonal-variation in water flux, field metabolic-rate and food-consumption of free-ranging koalas (Phascolarctos-Cinereus).Crossref | GoogleScholarGoogle Scholar |
Ellis, WAH, Melzer, A, Carrick, FN, and Hasegawa, M (2002). Tree use, diet and home range of the koala (Phascolarctos cinereus) at Blair Athol, central Queensland. Wildlife Research 29, 303–311.
| Tree use, diet and home range of the koala (Phascolarctos cinereus) at Blair Athol, central Queensland.Crossref | GoogleScholarGoogle Scholar |
Ellis, W, Melzer, A, Clifton, I, and Carrick, F (2010). Climate change and the koala Phascolarctos cinereus: water and energy. Australian Zoologist 35, 369–377.
| Climate change and the koala Phascolarctos cinereus: water and energy.Crossref | GoogleScholarGoogle Scholar |
Gallahar, N, Leigh, K, and Phalen, D (2021). Koala tree selection in a mixed-tenure landscape and post-fire implications. Wildlife Research 48, 737–755.
| Koala tree selection in a mixed-tenure landscape and post-fire implications.Crossref | GoogleScholarGoogle Scholar |
Goldingay, RL, and Dobner, B (2014). Home range areas of koalas in an urban area of north-east New South Wales. Australian Mammalogy 36, 74–80.
| Home range areas of koalas in an urban area of north-east New South Wales.Crossref | GoogleScholarGoogle Scholar |
Hindell, MA, and Lee, AK (1988). Tree use by individual koalas in a natural forest. Wildlife Research 15, 1–7.
| Tree use by individual koalas in a natural forest.Crossref | GoogleScholarGoogle Scholar |
Hindell MA, Lee AK (1990) Tree preferences of the koala. In ‘Biology of the koala’. (Eds AK Lee, KA Handasyde, GD Sanson) pp. 117–121. (Surrey Beatty and Sons: Sydney)
Hynes, EF, Whisson, DA, and Di Stefano, J (2021). Response of an arboreal species to plantation harvest. Forest Ecology and Management 490, 119092.
| Response of an arboreal species to plantation harvest.Crossref | GoogleScholarGoogle Scholar |
Jurskis V, Potter M (1997) Koala surveys, ecology, and conservation at Eden. (Forest Research and Development Division, State Forests of New South Wales: Sydney)
Kavanagh, RP, and Stanton, MA (2012). Koalas use young Eucalyptus plantations in an agricultural landscape on the Liverpool Plains, New South Wales. Ecological Management & Restoration 13, 297–305.
| Koalas use young Eucalyptus plantations in an agricultural landscape on the Liverpool Plains, New South Wales.Crossref | GoogleScholarGoogle Scholar |
Kavanagh, RP, Stanton, MA, and Brassil, TE (2007). Koalas continue to occupy their previous home-ranges after selective logging in Callitris–Eucalyptus forest. Wildlife Research 34, 94–107.
| Koalas continue to occupy their previous home-ranges after selective logging in Callitris–Eucalyptus forest.Crossref | GoogleScholarGoogle Scholar |
Law, B, Caccamo, G, Roe, P, Truskinger, A, Brassil, T, Gonsalves, L, McConville, A, and Stanton, M (2017). Development and field validation of a regional, management-scale habitat model: a koala Phascolarctos cinereus case study. Ecology and Evolution 7, 7475–7489.
| Development and field validation of a regional, management-scale habitat model: a koala Phascolarctos cinereus case study.Crossref | GoogleScholarGoogle Scholar |
Law, BS, Brassil, T, Gonsalves, L, Roe, P, Truskinger, A, and McConville, A (2018). Passive acoustics and sound recognition provide new insights on status and resilience of an iconic endangered marsupial (koala Phascolarctos cinereus) to timber harvesting. PLoS ONE 13, e0205075.
| Passive acoustics and sound recognition provide new insights on status and resilience of an iconic endangered marsupial (koala Phascolarctos cinereus) to timber harvesting.Crossref | GoogleScholarGoogle Scholar |
Law, B, Kerr, I, Gonsalves, L, Brassil, T, Eichinski, P, Truskinger, A, and Roe, P (2022a). Mini-acoustic sensors reveal occupancy and threats to koalas Phascolarctos cinereus in private native forests. Journal of Applied Ecology 59, 835–846.
| Mini-acoustic sensors reveal occupancy and threats to koalas Phascolarctos cinereus in private native forests.Crossref | GoogleScholarGoogle Scholar |
Law, B, Gonsalves, L, Burgar, J, Brassil, T, Kerr, I, O’Loughlin, C, Eichinski, P, and Roe, P (2022b). Regulated timber harvesting does not reduce koala density in north-east forests of New South Wales. Scientific Reports 12, 3968.
| Regulated timber harvesting does not reduce koala density in north-east forests of New South Wales.Crossref | GoogleScholarGoogle Scholar |
Lunney, D, Wells, A, and Miller, I (2016). An ecological history of the koala Phascolarctos cinereus in Coffs Harbour and its environs, on the mid-north coast of New South Wales, c1861-2000. Proceedings of the Linnean Society of New South Wales 138, 1–48.
Marsh, KJ, Moore, BD, Wallis, IR, and Foley, WJ (2014). Continuous monitoring of feeding by koalas highlights diurnal differences in tree preferences. Wildlife Research 40, 639–646.
| Continuous monitoring of feeding by koalas highlights diurnal differences in tree preferences.Crossref | GoogleScholarGoogle Scholar |
Martin, RW (1985). Overbrowsing, and decline of a population of the koala, Phascolarctos cinereus, in Victoria. II. Population condition. Australian Wildlife Research 12, 367–375.
| Overbrowsing, and decline of a population of the koala, Phascolarctos cinereus, in Victoria. II. Population condition.Crossref | GoogleScholarGoogle Scholar |
Matthews, A, Lunney, D, Gresser, S, and Maitz, W (2007). Tree use by koalas (Phascolarctos cinereus) after fire in remnant coastal forest. Wildlife Research 34, 84–93.
| Tree use by koalas (Phascolarctos cinereus) after fire in remnant coastal forest.Crossref | GoogleScholarGoogle Scholar |
Melzer, A, and Lamb, D (1994). Low density populations of the koala (Phascolarctos cinereus) in Central Queensland. Proceedings of the Royal Society of Queensland 104, 89–93.
Melzer, A, Baudry, C, Kadiri, M, and Ellis, W (2011). Tree use, feeding activity and diet of koalas on St Bees Island, Queensland. Australian Zoologist 35, 870–875.
| Tree use, feeding activity and diet of koalas on St Bees Island, Queensland.Crossref | GoogleScholarGoogle Scholar |
Melzer, A, Cristescu, R, Ellis, W, FitzGibbon, S, and Manno, G (2014). The habitat and diet of koalas (Phascolarctos cinereus) in Queensland. Australian Mammalogy 36, 189–199.
| The habitat and diet of koalas (Phascolarctos cinereus) in Queensland.Crossref | GoogleScholarGoogle Scholar |
Moore, BD, Wallis, IR, Wood, JT, and Foley, WJ (2004). Foliar nutrition, site quality, and temperature influence foliar chemistry of tallowwood (Eucalyptus microcorys). Ecological Monographs 74, 553–568.
| Foliar nutrition, site quality, and temperature influence foliar chemistry of tallowwood (Eucalyptus microcorys).Crossref | GoogleScholarGoogle Scholar |
Pollard, JH (1971). On distance estimators of density in randomly distributed forests. Biometrics 27, 991–1002.
| On distance estimators of density in randomly distributed forests.Crossref | GoogleScholarGoogle Scholar |
Radford, SL, McKee, J, Goldingay, RL, and Kavanagh, RP (2006). The protocols for koala research using radio-collars: a review based on its application in a tall coastal forest in New South Wales and the implications for future research. Australian Mammalogy 28, 187–200.
| The protocols for koala research using radio-collars: a review based on its application in a tall coastal forest in New South Wales and the implications for future research.Crossref | GoogleScholarGoogle Scholar |
Radford Miller SL (2012) Aspects of the ecology of the koala, Phascolarctos cinereus, in a tall coastal production forest in north eastern New South Wales. Doctoral dissertation. Southern Cross University.
Slade, C, and Law, B (2017). The other half of the coastal State Forest estate in New South Wales; the value of informal forest reserves for conservation. Australian Zoologist 39, 359–370.
| The other half of the coastal State Forest estate in New South Wales; the value of informal forest reserves for conservation.Crossref | GoogleScholarGoogle Scholar |
Stalenberg, E, Wallis, IR, Cunningham, RB, Allen, C, and Foley, WJ (2014). Nutritional correlates of koala persistence in a low-density population. PLoS ONE 9, e113930.
| Nutritional correlates of koala persistence in a low-density population.Crossref | GoogleScholarGoogle Scholar |
Woodward, W, Ellis, WA, Carrick, FN, Tanizaki, M, Bowen, D, and Smith, P (2008). Koalas on North Stradbroke Island: diet, tree use and reconstructed landscapes. Wildlife Research 35, 606–611.
| Koalas on North Stradbroke Island: diet, tree use and reconstructed landscapes.Crossref | GoogleScholarGoogle Scholar |
