Ecological implications of deep pruning: a case report on Persian squirrel nesting in a centennial olive grove on the island of Lesvos, Greece

Yiannis G. Zevgolis; Christodoulos I. Sazeides; Evdoxia Bintsi-Frantzi; Alexandros D. Kouris; Apostolos Christopoulos

Yiannis G. Zevgolis https://orcid.org/0000-0003-4379-3007; Christodoulos I. Sazeides https://orcid.org/0000-0003-3558-4627; Evdoxia Bintsi-Frantzi https://orcid.org/0009-0004-0709-2881; Alexandros D. Kouris https://orcid.org/0009-0000-9417-1107; Apostolos Christopoulos https://orcid.org/0000-0001-5123-2432

1 March 2024 · volume 46 · (issue 3) · pp. 89–97 · PDF [full text]

Abstract: In recent years, traditional olive groves have undergone a shift towards modern farming practices, raising concerns about their potential impact on local fauna. Despite the documented effects of various agricultural practices on wildlife, there is a notable gap in understanding the implications of pruning practices in traditional olive groves. This study presents a unique observation, the first documented adverse effect of pruning on an olive tree within a traditional grove in Lesvos, Greece, inhabited by Persian squirrels (Sciurus anomalus). Beyond immediate impacts, we conducted comprehensive measurements of both the pruned olive tree and the squirrel’s nest (den), along with an assessment of the entire grove. The findings highlight the need for ecologically informed olive grove management to sustain biodiversity in these historically significant environments.

Keywords: Caucasian squirrel, centennial olive trees, nesting locality, threat, traditional olive groves

References [42]

Abenavoli L.M., Marcianò C. 2013 Technical and economic analysis of alternative pruning systems in high dimensions olive trees in Calabria. Agronomy Research 11 (1): 7–12.

Aghbolaghi M.A., Keyghobadi N., Azarakhsh Z., Dadizadeh M., Aghbolaghi S.A., Zamani N. 2023 An evaluation of isolation by distance and isolation by resistance on genetic structure of the Persian squirrel (Sciurus anomalus) in the Zagros forests of Iran. Ecology and Evolution 13 (7): e10225. https://doi.org/10.1002/ece3.10225

Aidek A., Amr Z.S., Abu Baker M. 2022 Distribution and conservation of Sciurus anomalus in Syria (Rodentia: Sciuridae). Lynx new Ser. 52: 5–13. https://doi.org/10.37520/lynx.2021.001

Arnan X., López B.C., Martínez-Vilalta J., Estorach M., Poyatos R. 2012 The age of monumental olive trees (Olea europaea) in northeastern Spain. Dendrochronologia 30 (1): 11–14. https://doi.org/10.1016/j.dendro.2011.02.002

Calabrese G., Tartaglini N., Ladisa G. 2012 Study on biodiversity in century-old olive groves. CIHEAM-Mediterranean Agronomic Institute, Bari, pp. 1–108.

Camposeo S., Vicino F., Vivaldi G.A., Pascuzzi S. 2023 Re-shaping pruning improves the dynamic response of centuries-old olive trees to branch-shaker vibrations application. Frontiers in Plant Science 14: 1155120. https://doi.org/10.3389/fpls.2023.1155120

Christopoulos A., Pafilis P. 2021 An agricultural practice as a direct threat to the snake-eyed skink Ablepharus kitaibelii (Bibron and Bory de Saint-Vincent, 1833) in central Greece. Herpetozoa 34: 9–12. https://doi.org/10.3897/herpetozoa.34.e61956

Connor D.J., Gómez-del-Campo M., Rousseaux M.C., Searles P.S. 2014 Structure, management and productivity of hedgerow olive orchards: A review. Scientia Horticulturae 169: 71–93. https://doi.org/10.1016/j.scienta.2014.02.010

Duarte F., Jones N., Fleskens L. 2008 Traditional olive orchards on sloping land: sustainability or abandonment? Journal of environmental management 89 (2): 86–98. https://doi.org/10.1016/j.jenvman.2007.05.024

Dudley N., Alexander S. 2017 Agriculture and biodiversity: a review. Biodiversity 18 (2–3): 45–49. https://doi.org/10.1080/14888386.2017.1351892

Edelman A.J., Koprowski J.L. 2005 Selection of drey sites by Abert’s squirrels in an introduced population. Journal of Mammalogy 86 (6): 1220–1226. https://doi.org/10.1894/0038-4909(2005)050[0461:DATUOA]2.0.CO;2

Edelman A.J., Koprowski J.L., Bertelsen S.R. 2009 Potential for nest site competition between native and exotic tree squirrels. Journal of Mammalogy 90 (1): 167–174.

European Environment Agency (EEA) 2020 Tree cover density. https://land.copernicus.eu/.

European Topic Centre on Biological Diversity 2015 Article 17 Web Tool on Biogeo-graphical Assessment of Conservation Status of Species and Habitat under Article 17 of the Habitats Directive. https://nature-art17.eionet.europa.eu/.

Gibbs K E., Mackey R.L., Currie D.J. 2009 Human land use, agriculture, pesticides and losses of imperiled species. Diversity and Distributions 15 (2): 242–253. https://doi.org/10.1111/j.1472-4642.2008.00543.x

Griffiths S.R., Semmens K., Watson S.J., Jones C.S. 2020 Installing chainsaw carved hollows in medium sized live trees increases rates of visitation by hollow dependent fauna. Restoration Ecology 28 (5): 1225–1236. https://doi.org/10.1111/rec.13191

International Olive Council 2007 Production Techniques in Olive Growing. IOC, Madrid.

Kabassi K., Martinis A., Minotou C. 2021 Estimating the value of monumental olive trees: Designing a tool using multi-criteria decision making. Trees, Forests and People 6: 100151. https://doi.org/10.1016/j.tfp.2021.100151

Katayama N., Osawa T., Amano T., Kusumoto Y. 2015 Are both agricultural intensification and farmland abandonment threats to biodiversity? A test with bird communities in paddy-dominated landscapes. Agriculture, Ecosystems and Environment 214: 21–30. https://doi.org/10.1016/j.agee.2015.08.014

Kizos T., Koulouri M. 2006 Agricultural landscape dynamics in the Mediterranean: Lesvos (Greece) case study using evidence from the last three centuries. Environmental science and policy 9 (4): 330–342. https://doi.org/10.1016/j.envsci.2006.02.002

Koprowski J.L., Gavish L., Doumas S.L. 2016 Sciurus anomalus (Rodentia: Sciuridae). Mammalian species 48 (934): 48–58. https://doi.org/10.1093/mspecies/sew004

Kostelenos G., Kiritsakis A. 2017 Olive Tree History and Evolution. In Olives and Olive Oil as Functional Foods. John Wiley and Sons, Ltd., St. John’s, pp. 1–12.

Legakis A., Maragou P. 2009 The red data book of threatened animals of Greece. Hellenic Zoological Society, Athens.

Llorca A.B, Tortosa, F.S., Guerrero-Casado J. 2023 Arboreal Behavior of Psammodromus algirus (Squamata: Lacertidae) in Olive Groves. Herpetological Conservation and Biology 18 (1): 155–160.

Loumou A., Giourga C. 2003 Olive groves: The life and identity of the Mediterranean. Agriculture and human values 20: 87–95. https://doi.org/10.1023/A:1022444005336

Marathianou M., Kosmas C., Gerontidis S., Detsi V. 2000 Land‐use evolution and degradation in Lesvos (Greece): a historical approach. Land Degradation and Development 11 (1): 63–73.

Michael D.R., Moore H., Wassens S., Craig M.D., Tingley R., Chapple D.G., O’Sullivan J., Hobbs R.J., Nimmo D.G. 2021 Rock removal associated with agricultural intensification will exacerbate the loss of reptile diversity. Journal of Applied Ecology 58 (7): 1557–1565. https://doi.org/10.1111/1365-2664.13897

Morgado R., Santana J., Porto M., Sanchez-Oliver J.S., Reino L., Herrera J.M., Rego F., Beja P., Moreira F. 2020 A Mediterranean silent spring? The effects of olive farming intensification on breeding bird communities. Agriculture, Ecosystems and Environment 288: 106694. https://doi.org/10.1016/j.agee.2019.106694

Pérez C., Acebes P., Franco L., Llusia D., Morales M.B. 2023 Olive grove intensification negatively affects wintering bird communities in central Spain. Basic and Applied Ecology 70: 27–37. https://doi.org/10.1016/j.baae.2023.04.005

Remm J., Lõhmus A. 2011 Tree cavities in forests–the broad distribution pattern of a keystone structure for biodiversity. Forest Ecology and Management 262 (4): 579–585. https://doi.org/10.1016/j.foreco.2011.04.028

Sánchez‐Fernández J., Vílchez‐Vivanco J.A., Navarro B. F., Castro‐RodrÍguez J. 2020 Farming system and soil management affect butterfly diversity in sloping olive groves. Insect Conservation and Diversity 13 (5): 456–469. https://doi.org/10.1111/icad.12435

Simoni S., Caruso G., Vignozzi N., Gucci R., Valboa G., Pellegrini S., Palai G., Goggioli D., Gagnarli E. 2021 Effect of long-term soil management practices on tree growth, yield and soil biodiversity in a high-density olive agro-ecosystem. Agronomy 11 (6): 1036. https://doi.org/10.3390/agronomy11061036

Troumbis A.Y., Zevgolis Y. 2020 Biodiversity crime and economic crisis: Hidden mechanisms of misuse of ecosystem goods in Greece. Land Use Policy 99: 105061. https://doi.org/10.1016/j.landusepol.2020.105061

Wilcove D.S., Koh L.P. 2010 Addressing the threats to biodiversity from oil-palm agriculture. Biodiversity and conservation 19: 999–1007. https://doi.org/10.1007/s10531-009-9760-x

Yigit N., Kryštufek B., Sozen M., Bukhnikashvili A., Shenbrot G. 2016 Sciurus anomalus (errata version published in 2017). The IUCN Red List of Threatened Species: e.T20000A115154256. 2016.

Zannetos S.P., Zevgolis Y.G., Christopoulos A., Akriotis T. 2022 Assessing habitat suitability of the Persian Squirrel in the island of Lesvos, Greece. Hystrix, the Italian Journal of Mammalogy 33 (2): 193–197. https://doi.org/10.4404/hystrix-00549-2022

Zevgolis Y.G., Christopoulos A. 2023 Entrapped in Olive-Harvesting Nets: A Case of a Grass Snake Natrix natrix from an Olive-Growing Greek Aegean Island. Diversity 15 (3): 452. https://doi.org/10.3390/d15030452

Zevgolis Y.G., Kouris A., Christopoulos A., Dimitrakopoulos P.G. 2023 Linking Thermal Indices, Productivity, Phenotypic Traits, and Stressors for Assessing the Health of Centennial Traditional Olive Trees. Applied Sciences 13 (20): 11443. https://doi.org/10.3390/app132011443

Zevgolis Y.G., Akriotis T., Dimitrakopoulos P.G., Troumbis A.Y. 2023 Integrating Thermal Indices and Phenotypic Traits for Assessing Tree Health: A Comprehensive Framework for Conservation and Monitoring of Urban, Agricultural, and Forest Ecosystems. Applied Sciences 13 (17): 9493. https://doi.org/10.3390/app13179493

Zevgolis Y.G., Christopoulos A., Kalargalis I.I., Zannetos S.P., Botetzagias I., Dimitrakopoulos P.G. 2023 An (Un) Expected Threat for a Regionally Near-Threatened Species: A Predation Case of a Persian Squirrel on an Insular Ecosystem. Animals 13 (1): 24. https://doi.org/10.3390/ani13010024

Zevgolis Y.G., Kamatsos E., Akriotis T., Dimitrakopoulos P.G., Troumbis A.Y. 2021 Estimating productivity, detecting biotic disturbances, and assessing the health state of traditional olive groves, using nondestructive phenotypic techniques. Sustainability 14 (1): 391. https://doi.org/10.3390/su14010391

Zevgolis Y.G., Alsamail M.Z., Akriotis T., Dimitrakopoulos P.G., Troumbis, A.Y. 2022 Detecting, quantifying, and mapping urban trees’ structural defects using infrared thermography: Implications for tree risk assessment and management. Urban Forestry and Urban Greening 75: 127691. https://doi.org/10.1016/j.ufug.2022.127691