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Patterns and Drivers of Rodent Abundance across a South African Multi-Use Landscape

C. Afonso, Beatriz,Swanepoel, Lourens H.,Rosa, Beatriz,Marques, Tiago A.,Rosalino, L. M.,Santos-Reis, Margarida,Curveira-Santos, Gonçalo

Abstract

South Africa’s decentralized approach to conservation entails that wildlife outside formally protected areas inhabit complex multi-use landscapes, where private wildlife business (ecotourism and/or hunting) co-exist in a human-dominated landscape matrix. Under decentralized conservation, wildlife is perceived to benefit from increased amount of available habitat, however it is crucial to understand how distinct management priorities and associated landscape modifications impact noncharismatic taxa, such as small mammals. We conducted extensive ink-tracking-tunnel surveys to estimate heterogeneity in rodent distribution and investigate the effect of different environmental factors on abundance patterns of two size-based rodent groups (small- and medium-sized species), across three adjacent management contexts in NE KwaZulu-Natal, South Africa: a private ecotourism game reserve, mixed farms and traditional communal areas (consisting of small clusters of houses interspersed with grazing areas and seminatural vegetation). Our hypotheses were formulated regarding the (1) area typology, (2) vegetation structure, (3) ungulate pressure and (4) human disturbance. Using a boosted-regression-tree approach, we found considerable differences between rodent groups’ abundance and distribution, and the underlying environmental factors. The mean relative abundance of medium-sized species did not differ across the three management contexts, but small species mean relative abundance was higher in the game reserves, confirming an influence of the area typology on their abundance. Variation in rodent relative abundance was negatively correlated with human disturbance and ungulate presence. Rodent abundance seems to be influenced by environmental gradients that are directly linked to varying management priorities across land uses, meaning that these communities might not benefit uniformly by the increased amount of habitat promoted by the commercial wildlife industry.

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animals A icle Pa e ns and D i e s o Roden Abundance ac oss a Sou h A ican Mul i-Use Landscape Bea iz C. A onso 1,* , Lou ens H. Swanepoel 2, Bea iz P. Rosa 1, Tiago A. Ma ques 3,4, Luís M. Rosalino 1, Ma ga ida San os-Reis 1and Gonçalo Cu ei a-San os 1   Ci a ion: A onso, B.C.; Swanepoel, L.H.; Rosa, B.P.; Ma ques, T.A.; Rosalino, L.M.; San os-Reis, M.; Cu ei a-San os, G. Pa e ns and D i e s o Roden Abundance ac oss a Sou h A ican Mul i-Use Landscape. Animals 2021,11, 2618. h ps:// doi.o g/10.3390/ani11092618 Academic Edi o : Emiliano Mo i Recei ed: 2 Augus 2021 Accep ed: 31 Augus 2021 Published: 7 Sep embe 2021 Publishe ’s No e: MDPI s ays neu al wi h ega d o ju isdic ional claims in published maps and ins i u ional a il- ia ions. Copy igh : © 2021 by he au ho s. Licensee MDPI, Basel, Swi ze land. This a icle is an open access a icle dis ibu ed unde he e ms and condi ions o he C ea i e Commons A ibu ion (CC BY) license (h ps:// c ea i ecommons.o g/licenses/by/ 4.0/). 1 cE3c—Cen e o Ecology, E olu ion and En i onmen al Changes, Faculdade de Ciências da Uni e sidade de Lisboa, Campo G ande, 1749-016 Lisboa, Po ugal; [email p o ec ed] (B.P.R.); [email p o ec ed] (L.M.R.); mm [email p o ec ed] (M.S.-R.); [email p o ec ed] (G.C.-S.) 2Depa men o Zoology, School o Ma hema ical & Na u al Sciences, Uni e si y o Venda, Thohoyandou 0950, Limpopo, Sou h A ica; [email p o ec ed] 3Cen e o Resea ch in o Ecological and En i onmen al Modelling, The Obse a o y, Uni e si y o S And ews, S And ews KY16 9LZ, UK; iago.ma [email p o ec ed] 4Cen o de Es a ís ica e Aplicações, Depa amen o de Biologia Animal, Faculdade de Ciências, Uni e sidade de Lisboa, 1749-016 Lisboa, Po ugal *Co espondence: bea izca [email p o ec ed] Simple Summa y: Wildli e ecological pa e ns a e d i en no only by en i onmen al and biological con ex s, bu also by landscape-managemen schemes ha shape hose con ex s. The p esen s udy aims o de e mine he e ec o di e en en i onmen al ac o s (including managemen schemes) on he occu ence pa e ns o a sou he n A ican small mammal communi y. Based on a landscape whe e h ee land-use con ex s ha di e in hei le els o human p esence and/o whe e ac i i ies coexis (p i a e eco ou ism ese e, mixed a ms and adi ional communal a eas), and by using a body-size-based app oach (i.e., using wo size-based oden g oups—medium and small—as models), we ound ha he mean ela i e abundance o medium-sized species did no di e ac oss he managemen con ex s, bu small species’ mean ela i e abundance was highe in he game ese e. The o e all a ia ion in oden abundance was nega i ely a ec ed by ungula e p esence (possibly linked o a dec ease in ood a ailabili y) and by human p esence (inc eased dis u bance). Roden abundance seems o be in luenced by en i onmen al g adien s ha a e di ec ly linked o a ying managemen p io i ies ac oss land uses, meaning ha hese communi ies migh no bene i uni o mly by he inc eased amoun o habi a p omo ed by he comme cial wildli e indus y. Abs ac : Sou h A ica’s decen alized app oach o conse a ion en ails ha wildli e ou side o mally p o ec ed a eas inhabi complex mul i-use landscapes, whe e p i a e wildli e business (eco ou ism and/o hun ing) co-exis in a human-domina ed landscape ma ix. Unde decen alized conse a ion, wildli e is pe cei ed o bene i om inc eased amoun o a ailable habi a , howe e i is c ucial o unde s and how dis inc managemen p io i ies and associa ed landscape modi ica ions impac noncha isma ic axa, such as small mammals. We conduc ed ex ensi e ink- acking- unnel su eys o es ima e he e ogenei y in oden dis ibu ion and in es iga e he e ec o di e en en i onmen al ac o s on abundance pa e ns o wo size-based oden g oups (small- and medium-sized species), ac oss h ee adjacen managemen con ex s in NE KwaZulu-Na al, Sou h A ica: a p i a e eco ou ism game ese e, mixed a ms and adi ional communal a eas (consis ing o small clus e s o houses in e spe sed wi h g azing a eas and semina u al ege a ion). Ou hypo heses we e o mula ed ega ding he (1) a ea ypology, (2) ege a ion s uc u e, (3) ungula e p essu e and (4) human dis u bance. Using a boos ed- eg ession- ee app oach, we ound conside able di e ences be ween oden g oups’ abundance and dis ibu ion, and he unde lying en i onmen al ac o s. The mean ela i e abundance o medium-sized species did no di e ac oss he h ee managemen con ex s, bu small species mean ela i e abundance was highe in he game ese es, con i ming an in luence o he a ea ypology on hei abundance. Va ia ion in oden ela i e abundance was nega i ely co ela ed wi h human dis u bance and ungula e p esence. Roden abundance seems o be in luenced by en i onmen al g adien s ha a e di ec ly linked o a ying managemen p io i ies ac oss land Animals 2021,11, 2618. h ps://doi.o g/10.3390/ani11092618 h ps://www.mdpi.com/jou nal/animals Animals 2021,11, 2618 2 o 18 uses, meaning ha hese communi ies migh no bene i uni o mly by he inc eased amoun o habi a p omo ed by he comme cial wildli e indus y. Keywo ds: non-in asi e sampling; ecological modelling; managemen op ions; conse a ion 1. In oduc ion In Sou h A ica, ag icul u al in ensi ica ion, and o e g azing ha e led o p o ound land use changes [ 1 ]. His o ically, mos landscapes we e con e ed in o li es ock a ms and a mlands, ei he as in ensi e, ex ensi e, o communally managed a eas [ 2 ], leading o he des uc ion, deg ada ion and/o agmen a ion o na u al ecosys ems [ 3 ]. Consequen ly, such habi a des uc ion led o declines in wildli e popula ions and dis ibu ion in much o Sou h A ican nonp o ec ed a eas [4]. Howe e , he es ablishmen o na ional policies a ibu ing cus odial igh s o e wildli e o landowne s, p omp ed a ansi ion in he go e nance o na u al esou ces om he s a e o p i a es [ 5 ]. This poli ical op ion led o widesp ead con e sion o angelands, i.e., a mlands and li es ock a ms, in o a eas dedica ed o comme cial wildli e indus ies, such as game anching and p i a e game/eco ou ism ese es [ 6 ]. The posi i e conse a- ion ou comes o hese policies o economically aluable and cha isma ic species [ 7 ] is belie ed o ha e an umb ella e ec on o he axa, mainly h ough he inc eased co e age, ep esen a i eness and connec i i y o p o ec ed/ es o ed habi a s [ 6 , 8 ]. Howe e , he e - ec o such managemen app oaches is unexplo ed o mos o e looked—bu unc ionally impo an — axa, such as oden s [ 9 ]. Thus, in o ma ion on he ecological esponses o less-cha isma ic axa is needed o be e gauge he complemen a y conse a ion ole o Sou h A ica’s p i a e land. In Sou h A ica, game a ms and p i a e game ese es o en coincide ac oss ela i ely small scales, oo ed in human-domina ed landscapes (e.g., communal lands) [ 10 ]. These land uses ha e con as ing managemen p io i ies and, consequen ly, dis inc impac s on he landscape s uc u e and wildli e ecological pa e ns. In game a ms, he main objec i e is o maximize he p oduc ion o ungula es o mea o hun ing, while in p i a e game ese es he goal is o main ain cha isma ic species, p omo ing eco ou ism-based ac i i- ies [ 11 ]. O en, hese wildli e-o ien ed land uses a e su ounded by human-domina ed a eas wi h high le els o an h opogenic dis u bance. The egional co-exis ence o all hese land uses gene a es complex mul i- enu ed landscapes, usually di ided by semi-pe meable wildli e ences, in luencing he biodi e si y suppo ed by each o hese land uses [12]. Managemen ac ions di ec ed o cha isma ic o aluable species may ha e cascading e ec s on oden s, usually o e looked and handled like pes s [ 13 – 15 ]. Howe e , i is c ucial o unde s and he e ec o human-induced land-use changes on oden spa ial pa e ns, as well as he unde lying ecological mechanisms he eo , since oden s a e undamen al o some ecosys em unc ions [ 16 ]. Roden s a e p ima y consume s [ 16 ] and suppo a la ge communi y o p eda o s [ 17 , 18 ], which makes hem a i al link in ood-chain s uc u ing [ 19 ]. Mo eo e , hey a e conside ed use ul indica o s o ecosys em unc ioning as hey a e aluable ools o he desc ip ion and moni o ing o habi a in eg i y. Fo hese easons, oden s ha e been used as model species o unde s and how land use changes a ec s wildli e [16]. Se e al ac o s ha e been iden i ied as in luen ial in shaping oden communi y and popula ion s uc u es, many o which a e o en de e mined by he landscape managemen op ions [ 20 ]. Some s udies ha e indica ed ha ege a ion ype and s uc u e a e undamen- al d i e s o oden occu ence and abundance [ 21 – 23 ]. Fo example, a eas wi h g ea e he baceous co e age a o oden s by p o iding shel e agains p eda o s, ood, and ade- qua e mic oclima ic condi ions [ 24 ]. S udies ha e shown nega i e e ec s o o e g azing on small mammals’ abundance, by educing he he baceous s a um, inc easing ampling isk and eeding compe i ion wi h ungula es [ 9 , 24 – 27 ]. Rega ding oden dis ibu ion, i ends Animals 2021,11, 2618 3 o 18 o be uni o m when he habi a is a o able and esou ces a e abundan . Howe e , when dis u bances inc ease he le el o habi a he e ogenei y, causing landscape agmen a ion, hei dis ibu ion is mos ly clumped [28,29]. Roden s a e no a homogeneous g oup, since di e en species may es ablish dis inc ela ionships wi h he en i onmen al and bio ic componen s o he ecosys em. Fo example, la ge oden s’ ange o e la ge spa ial scales han smalle oden s [ 30 ] and, he e o e, a e mo e suscep ible o changes a his landscape le el [31]. Changes in managemen p io i ies ac oss Sou h A ican mul i- enu ed landscapes will ha e a di ec impac on hese en i onmen al d i e s and, ul ima ely, in he dis ibu ion and abundance o small mammal species ac oss and wi hin managemen con ex s. Fo ins ance, when managemen measu es p omo e he abundance o ungula es (e.g., as p ey o la ge ca ni o e popula ions in eco ou ism ese es, o as hun ing asse s in game a ms), g azing p essu e will inc ease, nega i ely in luencing he he baceous s a a [ 26 ]. Alongside wi h long d y and ho seasons [ 32 ], hese condi ions may lead o sh ub enc oachmen , known o educe ood a ailabili y (lea es, seeds, and a h opods) o g ound dwelling oden s [ 33 ]. Ne e heless, some oden species a e usually conside ed e icien colonize s o human shaped en i onmen s [ 13 , 34 ], as hey a e able o use human- ela ed ood esou ces due o hei omni o e cha ac e [35]. Al hough he p ocesses ha egula e small mammals’ spa ial dis ibu ion a e known o some landscapes (e.g., woodland [ 29 ] and mixed o es [ 36 ]), he e is a lack o in o ma- ion ega ding he d i e s o oden -abundance pa e ns in A ican sa annas (bu see [ 9 , 37 ]), as well as how hese a y ac oss di e en managemen schemes. He e, we e alua ed he a ia ion in oden abundance ac oss h ee adjacen managemen con ex s, spanning a p i a e eco ou ism game ese e, mixed a ms and communally owned land, managed by Zulu ibal au ho i ies [ 12 ], unde he ollowing wo main objec i es: (1) o es ima e he e ogenei y in small-mammal-abundance dis ibu ion (mean abundance and pa chiness) ac oss managemen con ex s (game ese e, mixed a ms and communal lands); and (2) o de e mine he main, ine-scale en i onmen al ac o s a ec ing small-mammal-abundance pa e ns ac oss land-use ypes. These objec i es we e es ed in wo size-based oden g oups, o a mo e de ailed assessmen o ecological esponses. Linked o hese wo goals, we es ed ou hypo he ical d i e s o oden communi ies: (i) An a ea- ypology hypo hesis, i.e., cumula i e e ec o managemen -induced changes o ege a ion, g azing p essu e, e c., c ea es a ea-speci ic di e ences in oden abun- dance. Pa chiness will also be es ed o acknowledge in which a ea each g oup is mo e o less clumped, ega ding hei abundance alues. Al hough he exac e ec o a ea on oden abundance is no ully p edic able [ 37 ] (gi en he dis u bance g adien ) we expec ed he communal lands o ha e he lowes alues o abundance and highes pa chiness (i.e., mo e clumped), ollowed by mixed a ms and he game ese e, wi h highe abundances and lowe pa chiness; (ii) A ege a ion-s uc u e hypo hesis, i.e., a eas wi h highe he baceous co e will ha e a posi i e in luence on bo h oden size-based g oups, since i shapes he abili y o he landscape o p o ide p o ec ion agains po en ial p eda o s [21–23,25,27,38]; (iii) An ungula e-p essu e hypo hesis, i.e., oden species abundance is nega i ely in lu- enced by he abundance o ungula es, since highe g azing p essu e ends o dec ease he baceous land co e , inc ease dis u bance due o he ampling e ec , and inc ease landscape agmen a ion [9,24]; (i ) A human-dis u bance hypo hesis, i.e., oden species’ dis ibu ion is nega i ely in lu- enced by human dis u bance ac o s, such as he p esence o domes ic animals and households ha may cons ain species’ p esence [14,39]. 2. Ma e ials and Me hods 2.1. S udy A ea This s udy was implemen ed in he Mapu aland–Pondoland–Albany Biodi e si y Ho spo [ 40 ] in no he n KwaZulu-Na al, Sou h A ica. Ou speci ic s udy a ea is cha - Animals 2021,11, 2618 4 o 18 ac e ized by a spa ial g adien o human in e en ion, anging om he Mun-ya-wana p i a e game ese e (less subjec o human associa ed ac i i ies), o mixed game a ms and o communally managed lands, whe e wo dis inc Zulu communi ies a e se led (Figu e 1b). The Mun-ya-wana p i a e game ese e (27 ◦ 40 0 S–27 ◦ 55 0 S; 31 ◦ 12 0 E–32 ◦ 26 0 E) ep esen s he union o se e al p ope ies wi hou in e nal ences, managed by p i a e owne s whose goal is o explo e eco- ou is ic p oduc s, he e o e p omo ing wildli e and habi a conse a ion. Those managemen objec i es a e commonly ela ed wi h a mo e sus ainable use o wildli e, ypically wildli e- iewing ou ism [ 41 ]. The ese e is su - ounded, o he Sou h, by a mosaic o comme cial game anches o he p oduc ion o wild ungula e species, occasionally mixed wi h domes ic ca le [ 42 ] (he ea e mixed a ms) and ep esen s la ge expanses o na u al habi a wi h low human densi y. Communal lands o he eas a e composed o households, in e spe sed wi h pas u e a eas and semi-na u al ege a ion. The egion is cha ac e ized by a wa m- empe a u e clima e, wi h a humid and ho summe (Oc obe o Ap il), acco ding o he Köppen–Geige classi ica ion. Mean mon hly empe a u es ange om 19 ◦ C in July o 31 ◦ C in Janua y, and he a e age annual p ecipi a ion is 800 mm [ 43 , 44 ]. Ele a ion anges om 3 m o 304 m abo e sea le el [ 45 ], domina ed by a simila mix u e o ege a ion h oughou he a ea (bush eld, woodland and g assland) [ 46 ] (Figu e 1b). Ne e heless, he game ese e hos s a highe di e si y and abundance o p is ine habi a s, such as indigenous o es s, while mixed a ms a e mainly composed o pas u e a eas (low sh ubland and g assland–Figu e 1). Con a ily, communal lands ha e he lowes p opo ion o ege a ion and he highes co e o u ban– illage occupa ion (Figu e 1). 2.2. Roden Sampling Roden s we e sampled be ween Oc obe and No embe 2017 ( he sou he n hemi- sphe e’s sp ing) using ink- acking unnels [ 42 ], le ac i e in he ield o ou consecu i e nigh s (open ci cles in Figu e 1c). Ink- acking unnels we e made o obus co uga ed plas ic (55 × 10 × 10 cm), open on bo h ends o allow oden s o en e . Bo h en ances o he unnel a e equipped wi h an adhesi e pape wi h he glue side up, and an ink pad ( 12 ×10 cm ) was placed in he loo cen e [ 47 ] (Figu e S1B). In he middle o he unnel, a small PVC-pipe sec ion, hanging om he ceiling, was ins alled, and con ained bai composed o a mix u e o peanu bu e , oa meal and sun lowe oil [ 46 ]. The pipe was used o p e en he consump ion o he bai by he animals en e ing/c ossing he unnel. The ink unnels we e placed on he g ound, g ouped in clus e s o nine, in a Y o ma ion, 10 m apa om each o he (Figu e 1c). The a ms o he Y o ma ion we e 120 deg ees apa ( Figu e 1c ). This design p o ided an adequa e spa ial co e age in ela ion o he home- anges o he oden species, also ensu ing some le el o independence be ween sampling uni s, conside ing he mean dis ance be ween si es (see below). A e he ou - day sampling pe iod, he pla es o each ink unnel (con aining oo p in s and acks) we e pho og aphed indi idually, always a he same dis ance and wi h a e e ence scale. The oo p in da a was used o es ima e oden ela i e abundance, using he p opo - ion o he unnels wi h eco ds ( ack index; TI– o mo e de ails see Supplemen a y Ma e i- als) [ 48 ]. To ensu e ha his app oach cap u ed spa ial he e ogenei y in ela i e abundance, we conduc ed a small ial, compa ing he abundance indices de i ed om ink unnels o hose ob ained om li e- apping (see Supplemen a y Ma e ials, PART A). As ack iden i ica ion a he species le el is e y ime consuming and no iable in la ge-scale s udies, and as dis inguishing oo p in s om simila -sized species is e y di icul and bias p one, we op ed o di iding acks in o g oups based on ack size ( o mo e de ails see Supplemen a y Ma e ials PART A; Figu es S1A and S2A, Table S1A). Roden oo p in s we e g ouped in o h ee di e en size-based g oups pe body leng h/weigh , assuming a ela ion be ween oden body leng h/weigh and oo p in sizes [ 49 , 50 ]: small (body leng h: 50–100 mm), medium (100–150 mm) and la ge oden s (150–200 mm) ( Figu e S2B ). Sampling in en ionally ook place ou side he b eeding season (which peaks in he we season, [ 51 ]), in o de o a oid g ouping ju eniles in he w ong size-based g oup. Howe e , Animals 2021,11, 2618 5 o 18 conside ing he low numbe o de ec ions o la ge oden s in ink- acking unnels, we only analyzed he da a om small- and medium-sized oden s (see Resul s). The mos common species cap u ed du ing li e apping and linked o each g oup we e Mus minu oides and Dend omus melano is o small oden s, Mas omys na alensis and Saccos omus campes is o medium oden s and O omys angoniensis and Ra us a us o la ge oden s (Table S2A). Animals 2021, 11, x 5 o 18 2. Ma e ials and Me hods 2.1. S udy A ea This s udy was implemen ed in he Mapu aland–Pondoland–Albany Biodi e si y Ho spo [40] in no he n KwaZulu-Na al, Sou h A ica. Ou speci ic s udy a ea is cha ac- e ized by a spa ial g adien o human in e en ion, anging om he Mun-ya-wana p i- a e game ese e (less subjec o human associa ed ac i i ies), o mixed game a ms and o communally managed lands, whe e wo dis inc Zulu communi ies a e se led (Figu e 1b). The Mun-ya-wana p i a e game ese e (27°40′ S–27°55′ S; 31°12′ E–32°26′ E) ep e- sen s he union o se e al p ope ies wi hou in e nal ences, managed by p i a e owne s whose goal is o explo e eco- ou is ic p oduc s, he e o e p omo ing wildli e and habi a conse a ion. Those managemen objec i es a e commonly ela ed wi h a mo e sus aina- ble use o wildli e, ypically wildli e- iewing ou ism [41]. The ese e is su ounded, o he Sou h, by a mosaic o comme cial game anches o he p oduc ion o wild ungula e species, occasionally mixed wi h domes ic ca le [42] (he ea e mixed a ms) and ep e- sen s la ge expanses o na u al habi a wi h low human densi y. Communal lands o he eas a e composed o households, in e spe sed wi h pas u e a eas and semi-na u al eg- e a ion. The egion is cha ac e ized by a wa m- empe a u e clima e, wi h a humid and ho summe (Oc obe o Ap il), acco ding o he Köppen–Geige classi ica ion. Mean mon hly empe a u es ange om 19 °C in July o 31 °C in Janua y, and he a e age annual p ecip- i a ion is 800 mm [43,44]. Ele a ion anges om 3 m o 304 m abo e sea le el [45], domi- na ed by a simila mix u e o ege a ion h oughou he a ea (bush eld, woodland and g assland) [46] (Figu e 1b). Ne e heless, he game ese e hos s a highe di e si y and abundance o p is ine habi a s , such as indigenous o es s, while mixed a ms a e mainly composed o pas u e a eas (low sh ubland and g assland–Figu e 1). Con a ily, commu- nal lands ha e he lowes p opo ion o ege a ion and he highes co e o u ban– illage occupa ion (Figu e 1). Figu e 1. Loca ion o he s udy a ea in Sou h A ica, wi h he black do ep esen ing he loca ion o he s udy a ea in he Mapu aland egion o no he n KwaZulu-Na al ( a ); landscape composi ion o he h ee s udied a eas wi h dis inc managemen schemes–Mun-ya-wana p i a e game ese e, mixed a ms and communal land (Zulu ibal land)–wi h he loca ion o he sampling poin s and he numbe o sampling poin s pe a ea (in pa en hesis) ( b ); each sampling poin included a came a ap in he cen e and nine ink unnels, dis ibu ed in a Y shape (open ci cles ep esen ink unnels) (c). 2.3. En i onmen al Va iables Vege a ion s uc u e a iables we e collec ed using wo di e en app oaches: ield measu es and emo e-sensed p oduc s [ 52 ]. All a iables collec ed ha e been p e iously de ec ed as in luen ial o oden p esence elsewhe e (e.g., ege a ion co e ) [ 21 , 23 ]. Sh ub- and-g ass co e we e isually es ima ed and assigned he co esponding Edwa ds classi i- ca ion ca ego y [ 53 ] (see Table 1 o de ails), wi hin a 30 m adius bu e , cen e ed on he ink unnel’s Y o ma ion. Rega ding he land use, he p edominan ca ego ies we e selec ed ( hicke , g assland, sand o es and u ban illages) and, o each bu e , was assigned he ca ego y wi h he highes co e . Acco ding o he ype o c ops p esen in he s udy a ea, he ha es ing season occu s mos ly be ween Ap il and June [ 54 ], no coinciding wi h he s udy pe iod. The e o e, we assumed ha he e would be no in luence o c op p oduc i i y on he dis ibu ion/abundance o oden s in ou s udy. The pe cen age o ee co e was assessed based on he Global Fo es Wa ch da abase (Table 1). We also selec ed he No malized Di e ence Vege a ion Index (NDVI), widely used as a ege a ion p oduc i i y p oxy, collec ed om Landsa 8 Images [55]. Animals 2021,11, 2618 6 o 18 Va iables o ungula e p essu e and human dis u bance we e collec ed om Cu ei a- San os e al. [ 12 ] came a- ap su eys. Came as, loca ed in he cen e o he Y o ma ion, we e ac i e o 60–90 days, and a ached o a ee o me al s ake, 30 cm abo e he g ound, wi hou any bai and se o pho og aph a minimum delay (1 s o day ime and 30 s o nigh - ime) (see [ 12 ] o de ails). Each o he de ined ink- unnel clus e s (i.e., one clus e includes nine ink unnels and one came a- ap; Figu e 1c) we e spaced app oxima ely 1.4 km apa (Figu e 1b). In o al, we e sampled 196 poin s: 100 poin s in Mun-ya-wana eco- ou ism/game ese e, 50 poin s in mixed a ms and 46 poin s in communal lands. Cap u e a es, exp essed as he numbe o independen came a eco ds (>1 h in e al be ween pho og aphs o he same species, pe 100 ap-days) o li es ock (cows and goa s), wild ungula es and human dis u bance, we e used as su oga es o dis u bance in he modeling p ocedu e (Table 1). Wild ungula es we e g ouped acco ding o wo c i e ia: weigh , since ampling is one o he main nega i e impac s o ungula es on oden s [ 26 ], and/o he ac ha hey a e ac i ely managed in all s udied a eas (Table S1B). Only ungula es weighing be ween 45–200 kg and ac i ely managed we e used in he analysis, since hey a e mo e abundan han o he ungula es, as hey a e p esen h oughou he a eas unde s udy, and because hey ha e a g ea e impac on oden s, due o hei weigh (Table S1B). Li es ock we e also sepa a ed in wo weigh classes: i.e., goa s and cows. Table 1. En i onmen al a iables used in he modeling p ocedu e used o assess he de e minan s o oden abundance, collec ed in he ield, om came a- apping o based on emo e-sensing da a (GIS-based a iables). The a iable desc ip ion, ac onym, ange, esolu ion and sou ce, as well he e e ence ha suppo hei in luence on oden p esence/abundance, a e lis ed. H1—Hypo hesis 1; H2—Hypo hesis 2; H3—Hypo hesis 3, H4—Hypo hesis 4. Va iable Ac onym Desc ip ion Mean/Range Resolu ion Sou ce Suppo ing Re e ences AREA TYPE (H1) A ea Managmen con ex Mixed a ms Mun-ya-wana Communal lands Collec ed a poin - [37] VEGETATION STUCTURE (H2) T ee_Co e % T ee Co e 30.80/6–72% 30 ×30 m Global Fo es Wa ch h ps://www. global o es wa ch.o g/ (16 Ap il 2019) [27,56] Sh ub_Co e % o Sh ub co e Con inuous (C)—76–100% Semi-con inuous (SC)—51–74% Mode a ed closed (MC)—26–50% Semi-open (SO)—11–25% Open (O)—0–10% 30 m bu e Visually es ima ed [22,27,39,57–60] G ass_Co e % o G ass co e Con inuous (C)—76–100% Semi-con inuous (SC)—51–74% Mode a ed closed (MC)—26–50% Semi-open (SO)—11–25% Open (O)—0–10% 30 m bu e Visually es ima ed [22,25,38,57] Land_use Land use ca ego ies Thicke G assland Sand Fo es U ban Villages 30 m bu e 2013–2014 Na ional Land Co e Sou h A ica-SASDI h p://www.sasdi.ne / (16 Ap il 2019) [21–23] NDVI No malized di e ence ege a ion index calcula ed om Landsa images 0.48/0.28–0.67 30 ×30 m Landsa 8 h ps: //ea hexplo e .usgs.go / (18 Ap il 2019) [60,61] Animals 2021,11, 2618 7 o 18 Table 1. Con . Va iable Ac onym Desc ip ion Mean/Range Resolu ion Sou ce Suppo ing Re e ences UNGULATE PRESSURE (H3) Goa s Cap u e a e o goa s (numbe o eco ds pe 100 days o apping) 0.16/0–1.88 Collec ed a poin Came a- apping su ey [9,24,26] Li es ock Cap u e a e o cows (numbe o eco ds pe 100 days o apping) 0.20/0–3.17 Collec ed a poin Came a- apping su ey Wild Ungula es Cap u e a e o ungula es (numbe o eco ds pe 100 days o apping) 0.750/0–3.48 Collec ed a poin Came a- apping su ey DISTURBANCE VARIABLES (H4) HUMANS Cap u e a e o humans 0.84/0–10 Collec ed a poin Came a- apping su ey [39] DIST Dis ance o houses 2.738/0.031–9.867 km Collec ed a poin Came a- apping su ey 2.4. Da a Analyses/Modelling 2.4.1. Spa ial Pa e ns o Roden Rela i e Abundance Ac oss A eas and Size-Based G oups Di e ences in mean abundance alues o size-based g oups (small and medium) be ween s udy a eas (Mun-ya-wana game ese e, mixed a ms and communal lands) we e es ed using GLM wi h 3-le el a ea co a ia e and binomial e o dis ibu ion. The magni- ude o pa chiness in each a ea was asce ained by spa ial-poin pa e n analysis o coun da a using Lloyd’s index o pa chiness [ 62 ]. A Lloyd’s index o 1 indica es a andom dis ibu ion, whils one <1 sugges s uni o mi y and >1 pa chiness. 2.4.2. In luence o En i onmen al Va iables on Roden Rela i e Abundance Due o he high numbe o candida e a iables and o a oid mul icollinea i y bias, we i s es ima ed he nonpa ame ic Spea man’s co ela ion ( s ) using he “psych” R package [ 63 ]. When a high co ela ion be ween wo co a ia es was de ec ed ( s≥ 0.7; [ 62 ]), he a iable ha was less co ela ed wi h he dependen a iable was excluded om he analysis [64]. The in luence o all candida e a iables on oden ela i e abundance was es ed using a boos ed- eg ession- ee (BRT) app oach, implemen ed wi h he “gbm” package [ 65 ] in R [ 66 , 67 ]. This modelling echnique encompasses he ad an ages o eg ession ees (e.g., p edic o a iables can be o any ype, analysis is insensi i e o ou lie s and can accommoda e missing da a [ 68 ]), o e coming hei low p edic i e capaci y h ough he boos ing algo i hm [ 69 ]. The inal model is a linea addi ion o se e al eg ession models in which he simples e m is a ee [68,70]. Boos ed- eg ession- ee models a e esilien o model o e i ing bu , o ha e a be - e p edic i e pe o mance, we de ined, a p io i, he model’s inpu pa ame e s based on Ca slaw and Taylo ’s sugges ions [ 70 ]. In BRT, lea ning a e (l ) is he sh inkage pa ame e ha con ols he con ibu ion o each ee o he model, and ee complexi y ( c) de e mines he numbe o nodes in a ee and, consequen ly, i s size. These wo pa ame e s con ol he numbe o ees in he model, while he bag ac ion (0.5) selec s he p opo ion o da a be- ing used a each s ep [ 61 , 70 , 71 ]. All models we e i ed o allow in e ac ions using a en- old c oss alida ion o de e mine he op imal numbe o ees o each model. The la ges lea n- ing a e and he smalles ee complexi y we e selec ed o allow a minimum o 1000 ees in he BRT i ing p ocess (see [ 68 ]). Non-in o ma i e a iables we e emo ed du ing he i ing p ocess, allowing he simpli ica ion o he se o a iables [ 68 ]. This simpli ica ion consis ed o de ining how many a iables he unc ion can es o emo e, based on ela i e Animals 2021,11, 2618 8 o 18 in luence and o al numbe o a iables. Then, a g aph was p oduced showing di e ences in he p edic ed de iance acco ding o se e al scena ios, each one wi h a di e en numbe o a iables emo ed. Nex , he numbe o a iables o elimina e was decided, and hey we e emo ed in o de o mino ela i e in luence. We de ined a h eshold alue and only epo ed he in e ac ions wi h ela i e in luence alues >10%. The inal ela i e in luence o each a iable was calcula ed by a e aging he numbe o imes a co a ia e is used o spli ing, weigh ed by he squa ed imp o emen o he model as he esul o each spli . I is hen scaled, such ha he alues sum o 100 [ 72 ]. Fi ed alues we e plo ed in ela ion o he mos impo an p edic o s, e ealing hei e ec s on oden abundance. Explained de iance was calcula ed using he ollowing o mula om Abea e (2009) [73] D2=1− esidual de iance o al de iance  The 95% con idence in e als o each a iable we e es ima ed o he i ed unc ion by aking 500 boo s ap samples o he inpu da a, wi h he same size as he o iginal da a. A BRT was i ed o each sample, and he 5 h and 95 h pe cen iles we e calcula ed o he poin s o each unc ion. Models we e buil sepa a ely o small- and medium-sized oden s. Fo each model pe o med, in e ac ions be ween ypology and he o he in luen ial independen a iables (i.e., ela i e impo ance abo e >10%) we e es ima ed, o e alua e con ex -dependency in he in luence in he e ec en i onmen al a iable associa ed wi h he managemen con ex . All analyses we e implemen ed in R ia R S udio Ve sion 1.1.463 [66,67]. 3. Resul s 3.1. Spa ial Pa e ns o Roden Abundance Ac oss A eas and Size-Based G oups F om he 192 sampling poin s moni o ed, 85% p esen ed small oden acks, while 76% de ec ed he occu ence o medium oden s, wi h an o e lap in 35% o si es and in e -a ea a ia ion in de ec ion (i.e., numbe o unnels wi h signs/ o al numbe o unnels, Table S2B). Mean abundance in Mun-ya-wana game ese e was 0.52 ± 0.26 (mean ± SD) o small oden s and 0.43 ± 0.34 o medium oden s; in mixed a ms, 0.31 ± 0.21 o small oden s and 0.52 ± 0.32 o medium oden s; and in communal lands was 0.26 ± 0.23 o small oden s and 0.36 ± 0.24 o medium oden s (Figu e 2). Rega ding he GLM esul o size-based g oups, i e ealed signi ican di e ences in ela i e abundances only o small oden s, be ween Mun-ya-wana game ese e and he emaining a eas (Table S3B, Supplemen a y Ma e ials). No signi ican di e ences we e de ec ed in ela i e abundances o medium oden s be ween a eas (Figu e 3). Be ween g oups, signi ican di e ences we e only ound in mixed a ms (Table S3B, Supplemen a y Ma e ials), wi h medium oden s being mo e abundan (0.52 ± 0.37) han small-size oden s (0.31 ± 0.26) (Figu e 3). Based on hese esul s, he e ec o en i onmen al d i e s on oden abundance was e alua ed sepa a ely o each o he size-based g oups. Roden Pa chiness Lloyd’s Index o Pa chiness e ealed ha o e e y a ea and size-based g oup, all abun- dance alues we e agg ega ed ( γ > 1; Table 2). Bo h medium and small oden s a e he e oge- neously dis ibu ed wi hin he h ee s udy a eas (Figu e 3), demons a ing a he e ogenei y g adien . Acco ding o Table 2, we can obse e ha he highes alues o small oden s a e in communal lands, ollowed by mixed a ms and inally, he game ese e. Fo medium oden s, he e is a g ea e clus e ing pa e n in he game ese e, ollowed by communal lands and mixed a ms. Wi h hese esul s, i is possible o s a e ha he abundance pa e ns di e be ween he size-based g oups, and wi hin each a ea. Animals 2021,11, 2618 9 o 18 Animals 2021, 11, x 10 o 18 Figu e 2. Map o he s udy a ea showing oden dis ibu ions: small-size oden s a e in o ange and medium-size oden s in yellow. The size o each poin is equi alen o abundance alue, as indica ed in he espec i e legend. Figu e 3. Boxplo o medium and small oden s’ ela i e abundance in he h ee managemen - ype zones moni o ed: game (mixed) a ms, Mun-ya-wana game ese e and communal lands. Based on he GLM es , * indica es a signi ican di e ence be ween size-based g oups in mixed a ms (p = 0.011), + indica es a signi ican di e ence be ween Mun-ya-wana game ese e and emaining a eas o small oden s (p = 0.016). Figu e 2. Map o he s udy a ea showing oden dis ibu ions: small-size oden s a e in o ange and medium-size oden s in yellow. The size o each poin is equi alen o abundance alue, as indica ed in he espec i e legend. Animals 2021, 11, x 10 o 18 Figu e 2. Map o he s udy a ea showing oden dis ibu ions: small-size oden s a e in o ange and medium-size oden s in yellow. The size o each poin is equi alen o abundance alue, as indica ed in he espec i e legend. Figu e 3. Boxplo o medium and small oden s’ ela i e abundance in he h ee managemen - ype zones moni o ed: game (mixed) a ms, Mun-ya-wana game ese e and communal lands. Based on he GLM es , * indica es a signi ican di e ence be ween size-based g oups in mixed a ms (p = 0.011), + indica es a signi ican di e ence be ween Mun-ya-wana game ese e and emaining a eas o small oden s (p = 0.016). Figu e 3. Boxplo o medium and small oden s’ ela i e abundance in he h ee managemen - ype zones moni o ed: game (mixed) a ms, Mun-ya-wana game ese e and communal lands. Based on he GLM es , * indica es a signi ican di e ence be ween size-based g oups in mixed a ms ( p= 0.011 ), + indica es a signi ican di e ence be ween Mun-ya-wana game ese e and emaining a eas o small oden s (p= 0.016). Animals 2021,11, 2618 16 o 18 22. Layme, V.M.G.; Lima, A.P.; Magnusson, W.E. E ec s o i e, ood a ailabili y and ege a ion on he dis ibu ion o he oden Bolomys lasiu us in an Amazonian sa anna. J. T op. Ecol. 2004,20, 183–187. [C ossRe ] 23. Holland, G.J.; Benne , A.F. Di e ing esponses o landscape change: Implica ions o small mammal assemblages in o es agmen s. Biodi e s. 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