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Heavy flooding effects on home range and habitat selection of free-ranging Iberian hares (Lepus granatensis) in Doñana National Park (SW Spain)

Carro Mariño, Francisco; Soriguer Escofet, Ramón C.; Beltrán Gala, Juan Francisco; Andreu Rubio, Ana Cristina

Abstract

The Iberian hare Lepus granatensis is a common and abundant species throughout the Iberian Peninsula; however, studies documenting its ecology are scarce. Between August 1996 and September 1997, after a long drought, we studied the effects of a widespread flood on the Iberian hare ecology in ecotone pastures of Doñana National Park. Hares were captured using vertical nets through part of 1996 and 1997. Fourteen adult hares (nine females and five males) were tagged with radiocollars and located by triangulation on a daily basis at least once a week. Habitat use was estimated using a geographical information system. The average home range size was 28 ha for males and 24 ha for females. No significant differences were observed between sexes. Significant differences were observed in the use of scrub areas and in dry pastures. During the dry and wet seasons, males and females were most often located in the pastures of the ecotone, rush stands and scrub. The dense bracken (Pteridium aquilinum) and seaside bulrush (Scirpus maritimus) communities were avoided. These results are the first on the spatial ecology of this species in its native habitat.

Full text

Hea y looding e ec s on home ange and habi a selec ion o ee- anging Ibe ian ha es ( Lepus g ana ensis ) in Doña na Na ional Pa k (SW Spain) F ancisco Ca o & Ramón C. So igue & J. F. Bel án & Ana C. And eu Abs ac The Ibe ian ha e Lepus g ana ensis is a common and abundan species h oughou he Ibe ian Peninsula; howe e , s udies documen ing i s ecology a e sca ce. Be ween Augus 1996 and Sep embe 1997, a e a long d ough , we s udied he e ec s o a widesp ead lood on he Ibe ian ha e ecology in eco one pas u es o Doñana Na ional Pa k. Ha es we e cap u ed using e ical ne s h ough pa o 1996 and 1997. Fou een adul ha es (nine emales and i e males) we e agged wi h adiocolla s and loca ed by iangula ion on a daily basis a leas once a week. Habi a use was es ima ed using a geog aphical in o ma ion sys em. The a e age home ange size was 28 ha o males and 24 ha o emales. No signi ican di e ences we e obse ed be ween sexes. Signi ican di e ences we e obse ed in he use o sc ub a eas and in d y pas u es. Du ing he d y and we seasons, males and emales we e mos o en loca ed in he pas u es o he eco one, ush s ands and sc ub. The dense b acken (P e idium aquilinum) and seaside bul ush (Sci pus ma i imus) commu- ni ies we e a oided. These esul s a e he i s on he spa ial ecology o his species in i s na i e habi a . C ommunica ed by: Ma W. Haywa d F. Ca o ( * ) : R. C. So igue : A. C. And eu Es ación Biológica de Doñana (C. S. I. C.), A da Amé ico Vespucio s/n, Isla de la Ca uja, 41092 Se illa, Spain e-mail: pca [email protected] J. F. Bel án Depa men o Physiology and Zoology, Uni e si y o Se ille, A da. Reina Me cedes, 6, 41012 Se illa, Spain Keywo ds Lepus g ana ensis . Ibe ian ha e . Home ange . Habi a selec ion . Ibe ian Peninsula . Doñana . Flooding In oduc ion The p esence o an animal and i s spa ial dis ibu ion is de e mined by (a) esou ces dis ibu ion (Co ich 1976; Emlen and O ing 1977), (b) he p esence o absence o o he indi iduals o he same species (B own and O ians 1970), (c) he a ailabili y o app op ia e habi a (Johnson 1980; Thomas and Taylo 1990) and (d) he p esence and loca ion o p eda o s (Es es 2005; Ripple and Besch a 2004). As he densi y o animals inc eases, dispu es occu o e esou ces, which o ces animals o mo e owa ds habi a s wi h ewe esou ces bu less compe i ion (F e well and Lucas 1969). Howe e , qui e o en, spa ial displace- men is p oduced when he p e e ences habi a disappea (o a e s ongly educed). These e ec s a e obse ed a e a g ea snow co e o a e a lood (B oekhuizen and Maaskamp 1982; Hewson and Hinge 1990; Wol 1980). In his pape , we quan i y he e ec s on he changes o habi a use p oduced by haza dous clima ic e en s changes like a lood in he Doñana Na ional Pa k (DNP). Knowledge o home anges and habi a use in he Ibe ian Ha e is e y limi ed (de la Calzada and Ma ínez 1994; Rod íguez e al. 1997), and no wo k has e e s udied habi a selec ion and home ange in his endemic Ibe ian species. Ou aim was o documen Ibe ian ha e ’ s spa ial ecology, including habi a use and habi a selec ion, in a na u al, undis u bed, no-hun ed a ea o Doñana Na ional Pa k wi h special a en ion o he looding e ec s. Ma e ial and me hods S udy a ea This s udy was pe o med in he Doñana Na ional Pa k (SW Ibe ian Peninsula; Fig. 1). The clima e is Medi e anean sub-humid wi h mild and unp edic able ainy win e s and ho d y summe s. Gene ally, ain all is concen a ed o mid- sp ing. A long d ough , wi h a mean annual ain all less han 402 mm/yea , was obse ed du ing he pe iod 1990–1995. An in ense ainy season p oducing looding was obse ed om 13 Decembe 1996 o 31 Ap il 1997 (Me eo ological S a ion: Palacio de Doñana). The yea s 1996 o 1997 we e conside ed e y we , wi h annual ain all (abo e 1,000 mm) as ly exceeding he long- e m mean annual ain all o he a ea (506 mm, pe iod 1970–1996; U diales 1997). In ac , du ing au umn 1996, ain all was he 30-yea eco d and was ma ched by he nex yea ’ s ain all again. The main s udy a ea occu ed in he eco one zone be ween ma shland and sh ubland (Fig. 1). Two o he mos ou s anding cha ac e is ics o his eco one a e he g ea di e si y o animal species ha li e he e and he ac ha in some ainy yea s, i becomes looded e y quickly. The ege a ion o his zone is domina ed by he plan associa- ions Sci pe um ma i imi and Galio palus is wi h Junce um ma i imum. Cap u e me hods and adioma king Ha es we e cap u ed and adio- acked be ween Augus 1996 and Sep embe 1997. Ha es we e caugh a nigh by using a ehicle o d i e hem in o long ne s. The sex o all animals was iden i ied by hei ex e nal geni alia, and hey we e weighed o de e mine hei ages (Ca o 2005). This me hod o cap u e does no ha m he ha es, and many animals can be cap u ed in a sho space o ime (Kei h e al. 1968). A o al numbe o 14 ee- anging ha es ( i e males and nine emales) we e adio- acked (Table 1). Each ha e was ea -ma ked wi h indi idually iden i iable numbe ed plas ic ags and i ed wi h a adio- acking colla o ca. 30 g, less o 1.5% o body weigh o adul ha e, equipped wi h an ac i i y senso (Wagene adiocolla s, Ge many) wi h a li e expen ancy o 6 o 7 mon hs. Ha es we e loca ed one o wo imes a day on day ime and sun ise, a leas once a week, depending on he season. Loca ions we e pe o med by iangula ing pai s o ixed s a ions. The loca ion e o es ima ed om expe imen al ials was >10 m. Fo he home- ange analyses, we selec ed eleme y ixes sepa a ed by a leas 12 h, in o de o a oid any au oco ela ion be ween consecu i e loca ions (Swiha and Slade 1985a, b). An inc emen al a ea analysis was ca ied ou plo ing he size o home anges s. numbe o loca ions (Kenwa d and Hodde 1992). We ound ha 25 Fig. 1 S udy a ea in he Doñana Na ional Pa k Colla Sex Age Da e o cap u e Da e o las posi ion No. o loca ions 144.613 F SA 12/08/1996 12/12/1997 31 144.764 F A 08/08/1996 12/12/1997 42 144.564 F SA 08/08/1996 14/12/1997 43 144.714 M J 08/08/1996 09/06/1997 68 144.690 F A 12/08/1996 31/03/1997 35 144.914 F A 12/08/1996 01/04/1997 41 144.589 F A 13/08/1996 20/01/1997 28 144.539a F A 12/08/1996 20/01/1997 47 144.739 F SA 13/08/1996 23/09/1997 108 144.888 M A 04/03/1997 09/06/1997 31 144.839 M A 11/03/1997 28/07/1997 43 144.789 F A 12/03/1997 20/08/1997 58 144.764b M A 12/03/1997 06/09/1997 54 Table 1 Examples o Ibe ian Ha e adio agged in eco one o Doñana Na ional Pa k Colla emission equency; Da e o cap u e da e o i ing wi h adio colla ; Da e o las posi ion 150.080 M A 13/03/1997 28/09/1997 60 da e o las posi i on a a il able loca ions we e enough o ob aining a s able es ima e o he size o an Ibe ian ha e ’ s home ange. Home ange, habi a use and habi a selec ion Da a we e p e-p ocessed wi h he p og amme Loca e II e sion 1.3 (Pace 1990). Calcula ions o es ima ing he minimum angula e o be ween he obse ed angles and he es ima ion o he loca ion o he animal we e ca ied ou by means o a maximum likelihood es ima o (Len h 1981). The sizes o he ha es ’ home anges we e es ima ed using he p og amme RANGES V (Kenwa d and Hodde 1996), he home anges as exp essed by he minimum con ex polygon ha connec ed he mos a - lung poin s o he a i hme ical a e age o localisa ions o each animal (Moh and S ump 1966; Jen ich and Tu ne 1969), using 90% o adio localisa ions he eby excluding pe iphe al ixes which could be classed as occasional explo a o y excu sions, o calcula e he size o he home ange o Ibe ian ha es (Dixon and Chapman 1980; Tappe and Ba nes 1986). We used his es ima o o acili a ing compa ison wi h o he da a on ha es al eady published. Habi a use was calcula ed wi h a geog aphical in o ma ion sys em (Whi e and Ga od 1990) using he p og ammes Id isi (Cla k Labs., USA) and A c iew 3.1. Andalusian Go e nmen 1:16,000 scale ae ial maps om 1997 and 1998 we e also used. Fi s , a digi al ae ial pho og aph was geo- e e enced using he p og amme Id isi (Cla k Labs. USA). Six classes o ege a ion we e iden i ied (sc ub, ushes, b acken, eeds, d y pas u e and pas u es in “ La Ve a”, eco one) and hen digi alised and con e ed in o polygons. The pe cen age o use was calcula ed as he pe cen age o he home ange lying in each o he di e en habi a s; he a ailabili y pe cen age was aken as he ela i e p esence o each habi a wi hin he o al su ace a ea. In o de o es o signi ican di e ences be ween male and emale home anges, he Mann–Whi ney U es was applied. Habi a selec ion was es ablished by means o I le ’ s Index (I le 1961; Ga neau e al. 2008; Sido o ich e al 2008), in which he choice o habi a by he species was calcula ed by he o mula: IES : % Use − % A ailabili y = % Use þ % A ailabili y: The alue o I le ’ s Index a ies be ween +1, which would ep esen he exclusi e use o ha habi a by ha es, and −1, which would indica e a o al ejec ion o ha habi a . A alue o 0 indica es a neu al selec ion o he habi a in ela ion o i s pe cen age p esence in he whole a ea. Resu l s Home ange size The home ange es ima ed wi h a minimum con ex polygon using 90% o adio localiza ions was la ge in males (28 ± 12 ha) han in emales (24 ±10 ha) du ing he whole o he s udy pe iod, al hough he di e ence was no signi ican (Table 2). Homes anges and looding e ec s The la ges home ange obse ed (48 ha) was ha o a emale in he d y pe iod, which con as s wi h he la ges obse ed male home ange (36 ha). Du ing he we season, emales also had la ge home anges, wi h a e ages o 20 ha as opposed o a e age male alues o 16 ha (Table 2). The di e ences in Table 2 Home anges o adul Ibe ian ha es in eco one in sou he n Spain in wo seasons: d y (summe ), we (win e ) and home ange o al Males Females N Min. Max. x S N Min. Max. x S p MPC90 Eco one d y 5 12 36.2 22 8.9 9 13 47.6 22 12 ns MPC90 Eco one we 5 10 23.5 16 5.6 3 14 25.4 20 5.5 ns MPC90 Eco one To al 5 12 40.9 28 12 9 13 41 24 10 ns Min minimum, Max m, x a e age, S s anda d de ia ion, MPC90 d y minimum con ex polygon wi h 90% o adio localisa ions in d y season, MCP90 we minimum con ex polygon wi h 90% o adio localisa ions in we season, MPCTo al minimum con ex polygon wi h 90% o all adio localisa ions, p signi ica ion, ns no signi ican home anges obse ed in di e en seasons o he yea we e also non-signi ican (Mann–Whi ney U es , U =43; p =0.5). Habi a use and habi a selec ion Signi ican di e ences be ween sexes we e obse ed in he use o sc ub a eas (Mann–Whi ney U es = 24; p = 0.016) and in d y pas u es (Mann–Whi ney U es = 19; p = 0.004). In bo h seasons, males mos o en used he pas u es o he eco one and hen he ushes and sc ub. Males only used he d y pas u es du ing he d y season, and no use o he s ands o b acken o sedges was obse ed (Table 3). O e all, sc ubland a eas we e used mo e du ing he we season by males (Mann–Whi ney U es = 4.5; p = 0.08). No signi ican di e ences we e obse ed be ween he d y and we seasons o he han in he sc ub a eas, bo h sexes selec ed ushes posi i ely (I le ’ s Index: +0.32 o males du ing he d y season and +0.15 o emales in he we season). O he habi a s we e ac i ely a oided (nega i e I le ’ s Index). S ands o b acken and sedges we e ne e used by ei he sex. Sc ub was also la gely a oided, bu a small pa was some imes used by males (Table 3). Du ing he we season, ha es mo ed o highe a eas o a oid loods and e en occupied a eas o sc ubland, whe eas du ing he d y season ha es mo ed back owa ds he ma shland and occupied a eas and plan communi ies ( o example, eed beds) ha we e looded when wa e le els a e high (Fig. 2). Ha es hus mig a ed in he d y pe iod owa ds a eas ha became looded du ing he we season and in an opposi e di ec ion du ing he we season (Table 4). Discussion The ha es sex and home ange size We expec ed o ind signi ican a ia ion in home ange sizes be ween sexes, seasons and habi a s. These expec a ions we e Table 3 Habi a use o adul Ibe ian ha e in he eco one (Ha) du ing he we and d y seasons N numbe o animals s udied; Min minimum su ace a ea used o co esponding plan commu- ni y; Max minimum su ace a ea used o co esponding plan communi y; A e age a e age su ace a ea used o co esponding plan communi y; x a e age; S s anda d de ia ion; p signi icance le el; ns no signi ican We season D y season N Min Max x S N Min Max x S p Males Sc ub 5 0 3.7 1.8 1.4 5 0 1.3 0.3 0.6 ns Rushes 5 0.5 4.8 3.2 2.1 5 0 10.3 4.4 4.1 ns D y pas u es 5 0 0 0 0 5 0 2 0.5 1.0 ns B acken 5 0 0 0 0 5 0 0 0 0 ns Sedges 5 0 0 0 0 5 0 0 0 0 ns Reeds 5 0 0 0 0 5 0 0 0 0 ns Pas u e in La Ve a 5 4.5 18.6 11.2 6.1 5 10.8 23.7 16.4 4.8 ns Females Sc ub 3 0 0 0 0 8 0 0 0 0 ns Rushes 3 2.5 3.9 3.1 0.7 8 0.5 7.8 3.4 3 ns D y pas u es 3 1 2 1.6 0.3 8 0 6 1.4 1.8 ns B acken 3 0 0 0 0 8 0 0 0 0 ns Sedges 3 0 0 0 0 8 0 0 0 0 ns Reeds 3 0 0 0 0 8 0 1 0.1 0.3 ns Pas u e in La Ve a 3 10.4 21.2 15.6 5.4 8 6.5 39 15.7 9.7 ns p e e ence o habi a in he Sc ub Rushes D y pas u e B acken Sedges Reeds Pas u e in eco one Ibe ian Ha e in he eco one zone o Doñana Na ional Pa k Male WS −0.96 0.17 − 1 − 1 − 1 − 1 −0.69 Male DS −0.99 0.32 −0.56 − 1 − 1 − 1 −0.57 Female WS − 1 0.15 −0.05 − 1 − 1 − 1 −0.59 Fig. 2 Habi a use in he d y season and in he we season in he eco one o pas u es be ween sc ubland (on he le ) and ma shland (on he igh side o he igu e). Coo dina es UTM. Da um Eu opean 1959 ( o Spain and Po ugal) based on p e ious published s udies ha epo ed a ma ked in e - and in aspeci ic a ia ion in he size o home anges, which may be explained by ac o s such as body weigh (Ha es ad and Bunnell 1979), die and speci ic ene gy equi emen s (McNab 1986). P e ious in o ma ion on he home anges o he Ibe ian Ha e is e y pa chy. Two unpublished epo s on ha es eleased o e-in oduc ion, ci ed by Rod íguez e al. (1997), epo ed home anges much la ge han hose ound in his s udy (Fig. 3). Howe e , a compa ison be ween ou da a and hose published by Rod íguez e al. (1997) is p oblema ical, since hese au ho s wo ked wi h ha es whose beha iou may ha e been a ec ed by ecen ansloca ion, likely causing hem o pe o m e a ic mo emen s. Fu he mo e, home ange size is ela ed o esou ce a ailabili y in la ge p eda o s ein oduced o Addo Elephan Na ional Pa k (Haywa d e al. 2009). No o he da a a e a ailable o L. g ana ensis. Ibe ian ha e home ange s. o he ha es species Compa able published da a om o he ha e species (Lepus sp.) show ma ked a ia ion in home ange (Fig. 3), which is acco ding o expec ed alues (Ha es ad and Bunnell 1979). Adul Eu opean b own ha es (Lepus eu opaeus) a e 25– 35% la ge han adul Moun ain ha es (Lepus imidus) and so will equi e la ge home anges. Ne e heless, hese alues may a y depending on esou ces a ailable in he habi a s in which he ha es li e. Eu opean ha es ha li e in lowe -lying a eas wi h be e quali y ophic esou ces and a g ea e a ie y o c oplands and nea by shel e a eas ha e smalle home anges han hose ha li e in poo e -quali y habi a s (Tappe and Ba nes 1986). Thus, in mosaic a eas wi h an abundance o sh ubs, pas u es and c oplands, ha es can shel e in a eas o co e and eed in nea by open a eas wi hou ha ing o a el g ea dis ances. Table 4 I le ’ s Index o Female DS −1 0.20 −0.12 −1 −1 −0.72 −0.59 WS we season, DS d y season Home ange (Ha) Fig. 3 Home anges and mean body size o ha e species as epo ed in li e a u e. Pa kes (1984); Pielowski (1972); Rei z and Leona d (1994); Ma bou in and Aebische (1996); Tappe and Ba nes (1986); Ko acs and Búza (1988); B oekhuizen and Maaskamp (1982); Hulbe e al. (1996); Hewson and Hinge (1990); O ’ Fa ell (1965); Bou in (1984); Ca o (2005); Ba is a and Mexia de Almeida (1996), Fa án e al. (1999) and Vi gós e al. (2006). Lam Lepus ame icanus; Lg Lepus g ana ensis; L i Lepus imidus; 160 140 120 100 80 60 40 20 0 Lam Lg _ ansloca ed L i Lg _ his s udy Leu Leu Lepus eu opaeus 0 500 1000 1500 2000 2500 3000 3500 4000 4500 Weigh (g ) Snowshoe ha es L. ame icanus need la ge home anges gi en hei eliance as ood sou ces on hea he s, which g ow in pa ches and may e en be le inaccessible by snow co e (Hewson 1989). In a eas o abundan ophic esou ces, hese ha es may e en en e in o compe i ion wi h ca le (Hewson 1989). They also need shel e a eas and will a el la ge dis ances o ind hem, mo ing be ween a a ie y o eeding habi a s and e uge zones ha p o ide shel e om he wind and o he me eo ological e en s (Hewson and Hinge 1990). Moun ain and Eu opean ha e emales ha e smalle home anges han males. Hewson and Hinge (1990) ound ha in hese species, home anges we e la ge du ing he b eeding season, due o he ac , by an in e - and in a-sexual social dominance hie a chy. Male home anges o e lap and males sha e habi a (Hewson and Hinge 1990). In Doñana, we ound no signi ican di e ences be ween home anges, al hough emale home anges did end o be la ge . As epo ed o o he species o ha es (Hewson 1986), male and emale home anges coincide (bo h eeding and shel e a eas) in bo h he d y and we seasons, and as such, no e idence o e i o ial beha iou exis s (Fig. 2). Ne e he- less, some con lic s be ween males ha lead o a hie a chy in access o emales almos ce ainly occu . In DNP, male and emale adul Ibe ian ha es di e in habi a use. Ou da a showed ha males occasionally used he co e and o he esou ces o sc ubland a ea while he emales ne e we e obse ed ou side o he pas u e band. Calzada E de la and Ma ínez (1994) s udied Ibe ian ha es inhabi ing ano he ype o eco one using oad censuses. They ound ha ha es ha e a hei disposal all he en i onmen s hey need o be able o ca y ou hei li e cycles and so ha e smalle home anges han in he la ge ce eal plains o he Ibe ian Peninsula. These au ho s also epo ed ha in cul i a ed a eas, home anges espond o he cyclical changes ha occu in hese en i onmen s and popula ions a e es uc u ed as hey mo e om un a ou able o mo e a ou able li ing qua e s (de la Calzada and Ma ínez 1994). Rod íguez e al. (1997) eco ded e y la ge home anges ha included a ious habi a ypes, which we e chosen depending on equi emen s, al hough, as men ioned abo e, he use o ansloca ed ha es makes he in e p e a ion o hei da a complex. Home ange size depends on he ypes and deg ee o homogenei y o he habi a (Ma bou in and Aebische 1996) and he ime o ac i i y (Rei z and Léona d 1994). Ou da a ag ee wi h he indings o Bou in (1984) o L. ame icanus which was educe he home ange size depending he op imal die . Ma shlands a e seconda y habi a pa ially colonised e y d y season and holding high densi y a e long d ough pe iods (Ca o 2005). Ibe ian ha e home ange in we and d y season and looding e ec The a ia ions in home ange sizes be ween he d y and we seasons we e no signi ican , al hough a ia ions did end o be g ea es in he d y season, when pa o he eco one loods in he we season, he amoun o a ailable o he species is educed and ha es a e o ced o mo e o highe and d ie a eas (Table 2). Wol (1980) ound ha L. ame icanus occupied a eas ha p o ided e uge ( hick o es ) in win e and mo e open a eas in summe , which enabled ha es o espond o changes in he en i onmen . The mac opodid ma supial quokka Se onix b a ch y u u s inhabi s swamplands and exhibi s a simila mo emen pa e n du ing seasonal looding (Haywa d e al. 2004). Du ing ainy yea s, he e is high looding le el o he ma shland ha ew a eas can be occupied by Ibe ian ha es. When ha happens, Ibe ian ha es mo e (i hey can) om inside o he ma shland o each he ma shland bo de , de ined by eco one pas u es. These pas u es ac as a e uge habi a o Ibe ian ha es in he a ea. I hey canno escape om he lood, indi idual Ibe ian ha es may ind also a e uge in he island o ma shland, sca e ed sligh ly highe ele a ions anging in size om some dozens o me es o a ew hec a es, whe e hey emain isola ed o mon hs, su e ing high mo ali y a es due o p eda ion (Ca o e al. 2001, 2002; Ca o 2005). Only a ew o hem, i any, su i e he long isola ion pe iod. P eda ion and s a a ions a e he main mo ali y keys, same o quokkas (Haywa d e al. 2005). Acknowledgemen s The au ho s wish o exp ess hei g a i ude o he s a —especially Jose J. Cháns and J.C Calde ón—o he Doñana Na ional Pa k and Doñana Biological S a ion o hei help wi h he ieldwo k. This s udy was pa ially suppo ed by he Plan Andaluz de In es igación (Jun a de Andalucía; RNM-118) and P ojec “ E ec o he loods on popula ions o ha es in he Doñana ma shland” CICYT (1996 – 1997). D Ma Haywa d and wo anonymous e e ees p o ided insigh ul commen s on e sions o his manusc ip . Re e ences Ba is a T, Mexia de Almeida L (1996) Resul ados das medidas e ou as obse açoes em leb es cob adas em p o as e caçadas, de 1992 a 1995. Re Flo es 9(1):123–135 Bou in S (1984) E ec o la e win e ood addi ion on numbe s and mo emen s o snowshoe ha es. 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