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Frugivory and seed dispersal in the endemic cactus Eulychnia acida: extending the anachronism hypothesis to the Chilean Mediterranean ecosystem
- Rocío A. Cares†1,
- Consuelo Sáez-Cordovez†1,
- Alfonso Valiente-Banuet2,
- Rodrigo Medel1Email authorView ORCID ID profile and
- Carezza Botto-Mahan1
© The Author(s). 2018
- Received: 27 March 2018
- Accepted: 5 September 2018
- Published: 25 September 2018
Eulychnia acida is an endemic Chilean cactus species whose fruits show several traits that, taken as a whole, are compatible with a seed dispersal syndrome by large herbivore vertebrates. Since only a few large native mammals exist in Chile at present, cactus fruit consumption and seed dispersal may be coopted by introduced mammals as predicted by Janzen and Martin’s (1982) hypothesis for tropical ecosystems.
We describe the current frugivore species of E. acida in a protected semiarid-Mediterranean ecosystem using field measurements and feeding experiments. In addition, to examine a potential role as seed dispersers of the cactus species, we offered fruits and performed germination tests on seeds defecated by Lama guanicoe and the introduced goat Capra a. hircus under captivity conditions. Our data indicate that while fruits of E. acida are pecked by the Chilean tinamou, Nothoprocta perdicaria, and the Chilean mockingbird, Mimus thenca, and eaten by the brush-tailed rodent, Octodon degus, none of these species could be considered a legitimate seed disperser. Unlike L. guanicoe, the goat C. a. hircus did not reduce seed germination, having a neutral effect.
Results from this study indicate that introduced C. a. hircus was the only species showing a potential role in the seed dispersal process of E. acida. In the absence of native frugivore species, goats might play an important role in population recruitment of the endemic cactus. These results extend Janzen and Martin’s (1982) anachronism hypothesis to the Chilean Mediterranean ecosystem.
- Eulychnia acida
- Seed dispersal
- Lama guanicoe
- Octodon degus
Frugivory and seed dispersal are key ecological processes involved in the demography and maintenance of plant populations [1–4]. Frugivore species play a fundamental role in seed dispersal, as they increase the probability of seed germination by removing the pulp and/or through gut passage and carry seeds away from parental individuals to sites where the probability of seedling recruitment may be higher [5, 6]. It has been long accepted that current associations between plant and frugivore species are the outcome of selective forces that fit suites of fruit features to those animal species which maximize the seed dispersal process and plant recruitment [7, 8]. Nevertheless, in some circumstances, fruits may exhibit morphological traits best explained as adaptations for seed dispersal by extinct animal species, a phenomenon referred as “seed dispersal anachronism”. Guimaraes et al.  indicated that some current Neotropical fruits exhibit features that do not fit to dispersers present today but seem to exhibit apparent adaptations for the dispersal by large animals which are now extinct. Janzen and Martin  hypothesized that introduced and large herbivore vertebrates may act as surrogate dispersal agents in places where native frugivorous have disappeared. While in tropical forests some fleshy fruits show putative adaptations to animals that are extinct nowadays [9–11], this kind of study is lacking in Mediterranean ecosystems. This omission is unfortunate, as extinction of large herbivore mammals putatively involved in seed dispersal may be not only restricted to tropical ecosystems but encompass most Neotropical ones , including the current Chilean Mediterranean ecosystem.
The first goal of this study was to describe the native species eating the fruits and dispersing the seeds of E. acida. To this end, we carried out fruit-consuming field experiments in a protected area (Las Chinchillas National Reserve) and performed laboratory germination experiments. Our second goal was to evaluate whether seed passage through guanaco and goat digestive tracts enhance seed germination using no choice feeding and laboratory germination experiments. Finally, we examine the extent to which goats consume the fruits of E. acida outside the protected area, and whether this consumption could account for the different stage structure of cacti between the protected and unprotected areas. To this end, we took advantage of a natural setting provided by the National Reserve, where large introduced herbivores do not have access to cactus populations, and an unprotected area next to the Reserve where goats forage freely. More specifically, in this study we address the two following questions: (1) What native species do eat the fruits and disperse the seeds of E. acida in the Reserve? (2) Do guanacos and goats eat the fruits and increase seed germination of E. acida after gut passage? Based on our results we discuss on the functional role of guanacos and goats for the seed dispersal process of E. acida, framing our results under Janzen and Martin’s anachronism hypothesis as applied to the Chilean Mediterranean ecosystem.
This study was carried out within and in the area surrounding Las Chinchillas National Reserve, a semiarid protected area of north-central Chile (31°30’S, 71°06’W). The climate is a semiarid Mediterranean type, with most rainfall concentrated between June and August . Mean annual precipitation is 185.0 mm, with ample variation across years, alternating between long droughts and unusual years of high rainfall, seemingly associated with El Niño Southern Oscillation events. The vegetation consists of thorny shrubs such as Flourensia thurifera, Bahia ambrosioides and Porlieria chilensis , the columnar cactus species Trichocereus chiloensis and Eulychnia acida and the spherical cacti Cumulopuntia sphaerica and Eriosyce aurata [12, 14, 22].
Frugivore recordings inside the Reserve
To identify the species involved in E. acida fruit consumption, fifty 1 × 1 m footprint-traps were established on hills of this Reserve when fresh fruits started to appear on the ground. One fresh fruit was placed as bait in the middle of each footprint-trap (mean fruit size ± SE: 49.4 ± 4.8 mm width, 48.5 ± 3.9 mm length, n = 50), and tied with a nylon thread to keep track of fruit and seed consumers. Traps were checked for animal tracks during six consecutive days. Footprints were recorded with a digital camera, along with a tape measure. If the fruit had not been consumed, the footprint trap was brushed again, and the fruit was left in the same place.
No-choice feeding test
No-choice feeding experiments were also carried out with local goat individuals (n = 3) and guanaco specimens from the Chilean National Zoo (n = 11) (Fig. 3). Goats were fed with E. acida fruits ad-libitum and no other food source was provided. For guanacos, E. acida fruits were given ad-libitum along with alfalfa hay and Mazuri® Llama chews. Goats and guanacos were fed with E. acida fruits for 2 days and their feces collected for two consecutive days after feeding. Feces were placed in paper bags and transported to the laboratory where seeds were manually extracted. Only seeds that were intact and whole were used in germination experiments.
Seed germination experiments
Controlled experiments were performed to determine the effect of gut passage on germination of E. acida seeds. Seeds were sown in plastic pots with gravel as a substrate, moistened with filtered water and placed in a growth chamber (PITEC, Model BIOREF-38) at c. 26 °C with a 14:10 h (day/night) photoperiod. Germination was recorded daily for 30 days, or until no germinating seeds were observed for more than 7 days. The criterion used to consider a seed germinated was radicle emergence. To assess germination, one seed was sown per pot (n = 100 pots per treatment). Seeds for the control treatment were obtained from ripe fruits. To test for differences in germination among treatments, the Kaplan-Meier survival function was estimated and then compared using a log-rank test with Bonferroni adjustment . Analyses were performed in R software .
Recruitment of E. acida in the field
To assess juvenile recruitment, we recorded the number of young (less than 30 cm height), and adult individuals of E. acida in three patches of similar size inside the Reserve (Patch 1: 0.80 ha, Patch 2: 0.68 ha, Patch 3: 0.65 ha) and outside the Reserve (Patch 1: 0.61 ha, Patch 2: 0.75 ha, Patch 3: 0.75 ha). The areas were approximately 1 km apart and have similar characteristics of exposure, slope, vegetation composition and structure. Young individuals of E. acida were intensively searched on bare soil and under the bushes. A χ2 test was performed to evaluate differences in the stage structure between areas.
Frugivore species inside the Reserve
Three types of footprints were identified on the footprint-traps, corresponding to two bird species, the Chilean tinamou Nothoprocta perdicaria (n = 19 footprint-traps) and the Chilean mockingbird Mimus thenca (n = 15 footprint-traps), and one rodent species, the rodent O. degus (n = 11 footprint-traps). Only N. perdicaria can be suggested as a potential bird fruit consumer as fruits were found with signs of having been pecked (n = 6), albeit not enough to swallow seeds. On the other hand, M. thenca only pecked the fruit once; therefore, the evidence of fruit intake is insufficient. Only O. degus ate the fruits completely, carried the fruits to their caves, leaving only fruit remnants at the end of the thread (n = 8 footprint-traps).
Effect of gut passage on seed germination
Eulychnia acida recruitment
In this study, we examined the consumers of E. acida fruits in a protected area to determine the native species potentially involved in seed dispersal of this cactus species. We detected fruits with marks of having been pecked by two bird species, N. perdicaria and M. thenca. However, these birds did not eat enough of the fruit to ingest seeds, therefore they cannot be considered legitimate seed dispersers (sensu ). A previous study indicated that birds behave as seed dispersers of Trichocereus chiloensis (sin. Echinopsis chiloensis) a columnar cactus with ripe fruits that stay open on the cactus branch, exposing the sugared pulp to seed dispersers . Unlike T. chiloensis, the fruits of E. acida are indehiscent and present an acidic pulp , which is not preferred by birds. Our evidence indicates that O. degus was the only mammal species consuming fruits of E. acida during the sampling time. However, almost all seeds ingested by O. degus were destroyed and only a few seeds could be recovered from their feces. This result was in line with a previous generalization that rodents behave as seed predators, as they kill most of the seeds through the gut passage . In the light of these findings, we could conclude that the two-bird and one rodent species here examined cannot be considered legitimate seed dispersers (sensu ).
Regarding the seed dispersal syndrome concept, fruits often show characteristics associated with the type of seed disperser involved . Our results suggest that fruits of E. acida are not suitable for most native fruit consumers present in the Reserve. Because our data indicate that N. perdicaria, M. thenca and O. degus are not legitimate seed dispersers, it is unlikely that fruit traits of E. acida do fit to the feeding preference of the native Chilean fauna at present. By contrast, goats eat fruits of E. acida, and seed gut passage does not affect germination negatively. As goats often defecate at random in the field , seeds may fall in potentially safe places by chance only. Therefore, we suggest that goats could potentially enhance population recruitment of E. acida, which may account, at least in part, for the higher density of young E. acida individuals observed outside than inside the Reserve.
Species of the cactus family often have very low recruitment rates by both vegetative and sexual reproduction in natural conditions [29, 30]. In consequence, seed dispersers may play an important role as biotic agents that enhance the chance of germination and population recruitment . Other studies have described goats as a potential seed disperser for cactus species in Mexico [16, 17], where goat husbandry is one of the main economic activities. This is also the case in north-central region of Chile (27°22’ S, 70°19’ W to 33°3’ S, 71°38’ W), where goat overstocking is one of the main activities contributing to desertification [31, 32]. Contrary to the general assumption that goat activity conveys mostly habitat loss and degradation, the present study suggests they may act as important dispersal agents of Eulychnia populations.
Several large herbivore mammals such as Gomphotheres became extinct in Pleistocene times , and probably some of them ate cactus fruits as they have been suggested to have generalist trophic habits . One of the few large-sized mammal groups that survived megafauna Pleistocene extinctions was the genus Lama . It is likely that Lama species were involved in the seed dispersal process of Eulychnia species until the arrival of the Spaniards, during the XVI century. Then, guanaco populations rapidly declined in number and its distribution is mostly circumscribed to high elevation areas in the Andes Range due to overhunting and occupation of pastures by cattle that consumed the native vegetation [36, 37]. Because the geographical distribution of L. guanicoe does not overlap with the Reserve location at present , we hypothesize that in the last centuries goats may have played a surrogate functional role for the seed dispersal process of E. acida. The experimental evidence that unlike L. guanicoe, goats do not decrease the seed germination of E. acida after gut passage, suggests that in the absence of native frugivore species introduced goats might play an important role in the seed dispersal process of the endemic cactus E. acida, extending Janzen and Martin’s (1982) anachronism hypothesis to the Chilean Mediterranean ecosystem.
Our results indicate that fruits of E. acida are pecked by N. perdicaria and M. thenca, and eaten by the rodent O. degus. However, none of these species could be considered a legitimate seed disperser. Unlike L. guanicoe, the goat C. a. hircus, a species introduced by humans in semiarid Chilean ecosystems, consumed fruits of E. acida without decreasing seed germination. Indeed, our data indicate that variation in stage structure, a proxy of plant recruitment, between protected and unprotected areas may result from goat activity favoring cactus recruitment in areas where native dispersers are no longer present. Overall, the results of this study are compatible with Janzen and Martin’s (1982) anachronism hypothesis for tropical ecosystems, extended to the Chilean Mediterranean ecosystem.
We thank: A Bacigalupo, P Arroyo, P Cares, J Silva, R Garrido and N Peña for fieldwork assistance; G Rojo and A Sandoval for laboratory support; M Sallaberry for footprint identification; and J Cañas and J Abarca for authorization to use their photographs. RAC thanks the Laboratorio de Ecología de Comunidades, UNAM, Mexico. RAC and CSC thank the Chilean National Zoo for allowing feeding experiments with guanacos. CONAF allowed part of this research at Las Chinchillas National Reserve.
Financial support was provided by FONDECYT 1170367 and 1180850. RAC obtained a Research Residence Fellowship from the Departamento de Postgrado y Postítulo, Vicerrectoría de Asuntos Académicos, Universidad de Chile, and a CONICYT-Fellowship for Master’s Studies. AVB and RM received funding support by CYTED P417RT0228.
Availability of data and materials
The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
Experimental design: CBM, RM, RAC, CSC. Fieldwork: RAC and CSC. Performed the experiments: CSC and RAC. Data analysis: RAC, CSC, CBM, RM and AVB. Manuscript preparation: RAC, CSC, CBM, RM and AVB. All authors read and approved the final version of the manuscript.
Ethics approval and consent to participate
The captive conditions of O. degus were approved by the Ethics Committee of the Faculty of Medicine of University of Chile (CBA ≠ 0443 FMUCH).
Consent for publication
The authors declare that they have no competing interests.
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