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Right time, right place: a mixed method approach for invasive species management
Thesis (MSc)--Stellenbosch University, 2025.
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Stellenbosch : Stellenbosch University
2025
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| _version_ | 1867614123002429440 |
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| access_status_str | Open Access |
| author | Bell, Jonathan James Andrew |
| author2 | Measey, John |
| author_browse | Bell, Jonathan James Andrew Measey, John |
| author_facet | Measey, John Bell, Jonathan James Andrew |
| author_sort | Bell, Jonathan James Andrew |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (MSc)--Stellenbosch University, 2025. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/132066 |
| institution | Stellenbosch University (South Africa) |
| last_indexed | 2026-06-10T12:47:00.921Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2025 |
| publishDateRange | 2025 |
| publishDateSort | 2025 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/132066 Right time, right place: a mixed method approach for invasive species management Bell, Jonathan James Andrew Measey, John Henry, Dominic Stellenbosch University. Faculty of Science. Dept. of Botany and Zoology. Invasive species -- Management Toads -- Environmental aspects Toads -- Habitat Introduced organisms -- Data processing Biological invasions UCTD Thesis (MSc)--Stellenbosch University, 2025. Bell, J. J. A. 2025. Right time, right place: a mixed method approach for invasive species management. Unpublished masters thesis. Stellenbosch: Stellenbosch University [online]. Available: https://scholar.sun.ac.za/items/f220e3d3-1637-4b8d-bbbe-f210f336d5c7 ENGLISH ABSTRACT: Invasive alien species have implications for global change, with environmental and socio-economic damages estimated at US $1.288 trillion over the past 50 years. Cities, home to more than half of the global population, are undervalued for their biodiversity. With expanding global trade and transportation networks, cities serve as receptor sites for invasive species introductions. Management of invasive species in cities is challenging and complicated, relying heavily on access to invaded sites coupled with optimal execution of management interventions. This research, conducted between September 2022 and April 2024, aimed to identify key social and societal factors influencing property access for invasive species management in Cape Town, South Africa, to determine the most important considerations for implementing agents across the urban density gradient, and improve the efficacy of invasive species collection using the guttural toad (Sclerophrys gutturalis) as a case study. In order to determine the key social processes and societal factors important to residents when deciding whether to admit invasive species control agents onto their properties, I administered a set qualitative (n = 60) and quantitative questionnaires to 400 residents across an urban density gradient in Cape Town, South Africa. I found that appointment scheduling, agency affiliation, social influence, and timing considerations were critical when seeking access to properties for urban invasive species management. Additionally, I found that species charisma is an important variable with clear differences in levels of agreement for some species over others. To assess the optimal execution of management interventions, I used field-generated time-to-detection data (n = 2 589) with a Cox proportional hazard regression model to assess the impact taxon-specific weather and environmental covariates on detection times and detection probabilities of guttural toads (Sclerophrys gutturalis). The most parsimonious model shows that higher temperatures, increased humidity, and illuminated outdoor lights were associated with decreased detection times and increased detection probabilities. Additionally, higher lunar illumination was shown to significantly increase detection times and decrease detection probabilities. In addition to scaling up the team size and increasing the number of appointments during periods of increased temperature and humidity, while avoiding increased lunar illumination around full moon events, I found that three quarters of the toad detections occurred within the first ten minutes, with few to no toads being detected after 75 minutes. This research can be directly passed onto invasive species managers to assist in facilitating access to private properties and improving detection times and detection probabilities. Innovative methods detailed in this thesis can be applied to different cities, cultures, and taxa to help improve management of invasive species globally. AFRIKAANSE OPSOMMING: Uitheemse indringerspesies het belangrike implikasies vir globale verandering, met omgewings- en sosio- ekonomiese skade wat oor die afgelope 50 jaar op US $1,288 triljoen beraam is. Stede, die tuiste van meer as die helfte van die wêreldbevolking, word onderskat vir hul biodiversiteit. Met die uitbreiding van globale handels- en vervoernetwerke dien stede as reseptorplekke vir die bekendstelling van indringerspesies. Die bestuur van indringerspesies in stede is uitdagend en kompleks en steun sterk op toegang tot besmette terreine, gekombineer met die doeltreffende uitvoering van bestuursintervensies. Hierdie navorsing, wat tussen September 2022 en April 2024 uitgevoer is, het ten doel gehad om sleutel sosiale en samelewingsfaktore te identifiseer wat eiendomstoegang vir indringerspesiebestuur in Kaapstad, Suid-Afrika, beïnvloed. Dit het ook gepoog om die belangrikste oorwegings vir implementeringsagente oor die stedelike digtheidsgradiënt te bepaal en die doeltreffendheid van indringerspesieversameling te verbeter, met die gorrelskurwepadda (Sclerophrys gutturalis) as gevallestudie. Om die belangrikste sosiale prosesse en samelewingsfaktore te bepaal wat inwoners oorweeg wanneer hulle besluit om indringerspesiebestuurders toegang tot hul eiendomme te gee, het ek ‘n reeks kwalitatiewe (n = 60) en kwantitatiewe vraelyste aan 400 inwoners oor ‘n stedelike digtheidsgradiënt in Kaapstad, Suid-Afrika, toegedien. Ek het bevind dat afspraakskedulering, agentskap-affiliasie, sosiale invloed en tydsberekening van kritieke belang is wanneer toegang tot eiendomme vir stedelike indringerspesiebestuur verkry word. Daarbenewens het ek bevind dat spesie-charisma ‘n belangrike veranderlike is, met duidelike verskille in die vlak van instemming vir sommige spesies in vergelyking met ander. Om die optimale uitvoering van bestuursintervensies te bepaal, het ek veldgegenereerde tyd-tot-opsporing-data (n = 2 589) met ‘n Cox-proporsionele gevaarregressiemodel gebruik om die invloed van takson-spesifieke weer- en omgewingsveranderlikes op opsporingstye en opsporingswaarskynlikhede van gorrelskurwepaddas te bepaal. Die mees spaarsamige model toon dat hoër temperature, verhoogde humiditeit en verligte buiteligte geassosieer word met korter opsporingstye en hoër opsporingswaarskynlikhede. Verder is bevind dat verhoogde maanlig aansienlik langer opsporingstye veroorsaak en opsporingswaarskynlikhede verlaag. Benewens die uitbreiding van spangrootte en die verhoging van afsprake tydens periodes van verhoogde temperature en humiditeit – terwyl verhoogde maanlig rondom volmane vermy word – het ek bevind dat driekwart van alle paddabespeurings binne die eerste tien minute plaasgevind het, met baie min tot geen paddas wat ná 75 minute opgespoor is. Hierdie navorsing kan direk aan indringerspesiebestuurders oorgedra word om toegang tot privaat eiendomme te vergemaklik en opsporingstye en -waarskynlikhede te verbeter. Die innoverende metodes wat in hierdie tesis uiteengesit word, kan op verskillende stede, kulture en taksa toegepas word om die bestuur van indringerspesies wêreldwyd te verbeter. Masters 2025-05-22T07:22:13Z 2025-05-22T07:22:13Z 2025-03 Thesis https://scholar.sun.ac.za/handle/10019.1/132066 Stellenbosch University 96 pages : illustrations application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Invasive species -- Management Toads -- Environmental aspects Toads -- Habitat Introduced organisms -- Data processing Biological invasions UCTD Bell, Jonathan James Andrew Right time, right place: a mixed method approach for invasive species management |
| title | Right time, right place: a mixed method approach for invasive species management |
| title_full | Right time, right place: a mixed method approach for invasive species management |
| title_fullStr | Right time, right place: a mixed method approach for invasive species management |
| title_full_unstemmed | Right time, right place: a mixed method approach for invasive species management |
| title_short | Right time, right place: a mixed method approach for invasive species management |
| title_sort | right time right place a mixed method approach for invasive species management |
| topic | Invasive species -- Management Toads -- Environmental aspects Toads -- Habitat Introduced organisms -- Data processing Biological invasions UCTD |
| url | https://scholar.sun.ac.za/handle/10019.1/132066 |
| work_keys_str_mv | AT belljonathanjamesandrew righttimerightplaceamixedmethodapproachforinvasivespeciesmanagement |