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Research Article
Food habits and endozoochorous seed dispersal by small rodents (Cricetidae and Echimyidae) in a riparian forest in southeastern Brazil
Hábitos alimentares e dispersão endozoocórica de sementes por pequenos roedores (Cricetidae and Echimyidae) em uma floresta ripária no sudeste do Brasil
expand article infoLeonardo G. Lessa, Camilla S. Paula, Rafael S. Pessoa
‡ Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, Brazil
Open Access

Abstract

We analyzed the feeding habits and the endozoochoric seed dispersal of six species of Neotropical small rodents in a riparian forest in the Cerrado biome at the central portion of Espinhaço Mountain Range, Brazil. The species presented a miscellaneous diet consuming arthropod, especially Hymenoptera (ants) and Isoptera (termites), fruits of pioneer species and vegetative parts of plants (stems and leaves). The high frequency of arthropods in the diet of all species studied reinforces its importance as a food resource for small Neotropical rodents, especially in environments with a marked seasonality, such as in the Cerrado. The number of intact seeds after gut passage and the higher germinability of the ingested seeds, compared to the control group, indicates that the studied rodents acted mainly as dispersers and not as predators of small seeds (≤ 1 mm) of pioneer species (Melastomataceae and Rubiaceae).

Resumo

Analisamos os hábitos alimentares e a dispersão endozoocórica de sementes por seis espécies de pequenos roedores neotropicais em uma floresta ripária no bioma Cerrado localizada na porção central da Cadeia do Espinhaço, Brasil. As espécies apresentaram uma dieta diversificada consumindo artrópodes, especialmente Hymenoptera (formigas) e Isoptera (cupins), frutos de espécies pioneiras e partes vegetativas de plantas (caules e folhas). A alta frequência de artrópodes na dieta das espécies estudadas reforça sua importância como recurso alimentar para pequenos roedores neotropicais, especialmente em ambientes com marcada sazonalidade, como no caso do bioma Cerrado. O número de sementes intactas após passagem pelo trato digestório e a alta germinabilidade das sementes ingeridas, em comparação ao grupo controle, indica que os roedores estudados atuam principalmente como dispersores e não como predadores de pequenas sementes (≤ 1 mm) de espécies pioneiras (Melastomataceae e Rubiaceae).

Keywords

Cerrado, diet, scarification, Espinhaço Range

Palavras-chave

Cerrado, dieta, escarificação, Cadeia do Espinhaço

Introduction

Small rodents are the most diverse group of Neotropical terrestrial mammals (Emmons and Feer 1997; Patton et al. 2015). Knowledge of rodent feeding habits contributes not only to understanding their ecology, but it also allows us to obtain basic information that enables action on population conservation, management and restoration of rodent populations (Sahley et al. 2015). Most of the small Neotropical rodents (Cricetidae and Echimyidae) have been regarded as omnivorous (may be primarily frugivorous, herbivorous or granivorous), consuming fruits, seeds, and vegetative plant parts (stems, leaves or roots) (see Grenha et al. 2010; Paglia et al. 2012; Sahley et al. 2015). Nevertheless, recent studies have revealed a high consumption of arthropods by several species (Lessa and Costa 2009; Pinotti et al. 2011; Polop et al. 2014; Sahley et al. 2015; Galetti et al. 2016).

Because of their feeding habits and abundance in Neotropical habitats, rodents can affect seed dispersal and the survival of several plant species, directly influencing their spatial distribution pattern (Brewer and Rejmanék 1999; Lessa and Costa 2009; Grenha et al. 2010; Dittel et al. 2015). Their potential as seed dispersers is mainly related to their habit of storing seeds for later consumption (synzoochory), i.e. the transport of seeds outside their bodies, such as when a rodent removes a fruit/seed in his mouth to another place (Horn et. al. 2008 Brewer and Rejmanék 1999; Almeida and Galetti 2007; Haugaasen et al. 2010). These animals can, however, also act as endozoochorous dispersers, consuming and dispersing viable seeds after gut passage (Horn et al. 2008 Lessa and Costa 2009; Dittel et al. 2015; Sahley et al. 2016). In this context, rodents are particularly important and can act as dispersing agents, transporting seeds from one location to another (Horn et al. 2008 Carvajal and Adler 2008; Lessa and Costa 2009; Dittel et al. 2015; Sahley et al. 2016), or also as mortality agents, damaging the seeds consumed (Briani and Junior 2007; Carvajal and Adler 2008; David et al. 2015).

Endozoochorous seed dispersal results from a mutualistic interaction between plants and the animals that feed on ripe and nutritious fleshy fruits containing one or several seeds (Howe and Smallwood 1982; Lessa et al. 2013). Therefore, the role of small mammals as potential seed dispersers is usually related to the consumption of a wide variety of fruits and the presence of intact seeds in their feces, with generally increased germinability (Magnusson and Sanaiotti 1987; Vieira et al. 2006; Lessa and Costa 2009; Lessa et al. 2013). However, the process of gut scarification of the seed coat by passage through the digestive tract of small mammals (rodents and marsupials) does not always have positive effects on the germinability of the ingested seeds (see Traveset 1998; Lessa and Costa 2009; Cantor et al. 2010; Lessa et al. 2013; Sahley et al. 2016).

Small rodents can achieve higher density and higher biomass than larger species (Emmons and Feer 1997), however, their habits associated with their small size and efficient masticatory apparatus, equipped with chisel incisors and molariform teeth, are factors that may hinder studies on the food ecology of this group (Vieira et al. 2003; Lessa and Costa 2009). Another important aspect to consider when assessing the diet of a species is related to the availability of food resources (Pinotti et al. 2011). Seasonal environments, such as the Cerrado biome, can determine the diet of the species, since the availability of resources, especially arthropods and fruits, may vary during the year (Pinotti et al. 2011; Camargo et al. 2014; Melo et al. 2019). Furthermore, the degree of frugivory and the relative importance of the food items that make up their diet remain unknown for most species (Lessa and Costa 2009).

The present study described the diet, analyzed seasonal variations in the diet composition and examined the effects of gut passage on seed germination of fruit consumed by six species of small rodents collected in a riparian forest in the Cerrado of southeastern Brazil: Cerradomys subflavus (Wagner, 1842), Rhipidomys mastacalis (Lund, 1840), Oligoryzomys nigripes (Olfers, 1818), Nectomys squamipes (Brants, 1827), Necromys lasiurus (Lund, 1841) and Thrichomys apereoides (Lund, 1839).

Material and methods

Study site

We conducted the study in a riparian forest in Rio Preto State Park (RPSP; 18°09'S, 43°23'W), a fragment (12,000 ha) of the Cerrado biome located in the southern portion of the Espinhaço Mountain Range in the state of Minas Gerais, Brazil. The vegetation at the RPSP consists of Cerrado, which is a tropical savanna formation comprising different vegetation formation physiognomies (Oliveira-Filho and Ratter 2002), which includes: campos rupestres (dry rock grasslands), Cerrado (stricto sensu), cerradão (closed savanna) and riparian forests along the banks of the Rio Preto River. The climate is type Cwb, according to the Köppen classification, with mild, humid summers (October to April) and cool and dry winters (June to August). The average annual rainfall varies from 223 to 1550 mm and the average annual temperature ranges from 17 °C to 19 °C (Neves et al. 2005).

We also captured the following small mammal species in the same study site, the rodents Thalpomys lasiotis Thomas, 1916; Cerradomys scotti (Langguth & Bonviccino, 2002); and the didelphid marsupial’s Gracilinanus agilis (Burmeister, 1854); Marmosops incanus (Lund, 1840); Metachirus nudicaudatus (Desmarest, 1817); Monodelphis domestica (Wagner, 1842) and Didelphis albiventris Lund, 1840 (see Lessa and Paula 2014).

Sampling of rodents

We captured rodents monthly from November 2009 to October 2011, through the capture-mark-recapture method. We used 96 galvanized wire traps (300 × 160 × 160 mm) arranged in four 180 m parallel transects, 50 m apart. In each transect, we installed 12 capture stations, spaced apart by 15 m. As bait we used fruits (orange pieces), cotton balls soaked in Scotch emulsion and bacon bits. Captured animals were identified, marked with numbered ear tags (Zootech) and released at the same location.

Fecal analyzes

We collected feces directly from each specimen during manipulation or from inside the trap and stored samples in paper envelopes preserved at -10 °C to avoid fungi infestation. One fecal sample was considered as being all feces produced by a single animal in one night. In the laboratory, we examined samples under a stereoscopic microscope and identified food items to the lowest taxonomic level.

We used the relative frequency of occurrence (FO) expressed as the number of samples where an item was found (n) divided by the total number of samples and multiplied by 100, to determine the contribution of each item to the diet of rodents (Korschgen 1987). We excluded samples from recaptures of the same individuals, avoiding pseudo-replicates (Hurlbert 1984). We compared the diet for the four species with seven or more fecal samples using G test (Zar 2010) to compare the FO of animal items (arthropods) versus vegetal items (seeds and plant fragments) among species.

Germination tests

We separated the seeds found in the samples (before storing the feces at -10 °C) and set them to germinate under natural lighting conditions in Petri dishes containing a double layer of moistened filter paper. As a control group, we manually removed the seeds from mature fruits of the same species consumed and set them to germinate in similar conditions. Dishes were moistened regularly with distilled water and monitored daily for seed germination, defined as when protrusion of the hypocotyl-root axis was detected. Seedling emergence was recorded weekly for a total of 24 months. We tested the influence of gut passage on germination speed by means of a Komolgov-Sminirnov test on the comparison of the cumulative percentage of seed germination between ingested seeds and control group (Zar 2010). We used the chi-square to test for differences in germinability between the control group and seeds found in the samples, (Zar 2010). We used the term germinability to indicate the final proportion of germinated seeds (Ranal and Santana 2006). For all analyses, we used a significance level at 5% employing the statistical program BioEstat 5.0.

Results

Diet composition

Totalizing 9,216 trap-nights, we obtained 69 fecal samples belonging to five Cricetidae species: C. subflavus (n = 32), R. mastacalis (n = 17), O. nigripes (n = 8), N. squamipes (n = 7), N. lasiurus (n = 2) and one Echimyidae: T. apereoides (n = 3) (Table 1). We found arthropods in all fecal samples (100%), and the most frequent orders were Hymenoptera (ants) and Isoptera (termites) (Table 1). We found six different morphotypes of seeds and other plant parts (leaves, stems, and roots), belonging to four botanical families: Melastomataceae (Clidemia urceolata and Miconia holosericeae), Myrtaceae (Myrcia sp.), Cactaceae (unidentified), and Rubiaceae (Psychotria capitata and Psychotria sp.). All species (except N. lasiurus) consumed vegetative plant parts (leaves, stems, and roots) in different proportions (Table 1).

Table 1.

Relative frequency of occurrence (%) of food items found in the scats of six rodents’ species. Cs = Cerradomys subflavus; Rm = Rhipidomys mastacalis; On = Oligoryzomys nigripes; Ns = Nectomys squamipes; Ta = Thrichomys apereoides and; Nl = Necromys lasiurus; n = total number of scats analyzed.

Food itens Cs (n = 32) Rm (n = 17) On (n = 8) Ns (n = 7) Ta (n = 3) Nl (n = 2)
Arthropoda (total) 100 100 100 100 100 100
Aracnidae 3.1 28.6
Blattodea 9.3 5.9 25 14.3
Coleoptera 9.3 14.3
Dermaptera 12.5
Diptera 3.1 14.3
Diplopoda 3.1
Hymenoptera 43.7 17.6 12.5 57.1 100 50
Isoptera 43.7 23.5 37.5 42.8 100 50
Larva 12.5
Orthoptera 3.1 12.5
Unidentified Arthropoda 81.2 70.6 62.5 57.1 66.7 50
Seeds (total) 21.9 17.6 14.3 100
MELASTOMATACEAE
Clidemia urceolata 6.2 5.9 14.2 50
Miconia holosericea 6.2 5.9 14.2
MYRTACEAE
Myrcia sp. 3.1
CACTACEAE 3.1
RUBIACEAE
Psychotria capitata 5.9
Psychotria sp. 3.1 100
Plant parts (total) 21.9 23.5 12.5 14.2 66.6

We observed a significant difference in the consumption of arthropods items (G = 288.5, df = 27, P < 0.01) and plant items (seeds and plant parts) (G = 63.1, df = 18, P < 0.01) among the four species compared (C. subflavus, R. mastacalis, O. nigripes and N. squamipes).

We found no differences for diets between dry and rainy seasons, for any of the food items categories (arthropods: χ2 = 0.05, df = 1, P = 0.869; seeds: χ2 = 1.61, df = 1, P = 0.267 and plant fragments: χ2 = 2.17, df = 1, P = 0.140).

Most intact seeds found in samples (92.7%) were small (size ≤ 1 mm long), and the proportion of intact seeds was higher than that of damaged seeds (G = 22.0, df = 5, P < 0.01) (Table 2).

Table 2.

Total number (n) and percentage of samples (%) containing intact and damaged seeds.

Family/Species Scats (n) Intact seeds (%) Damaged seeds (%)
Cricetidae
Cerradomys subflavus 32 89.5 10.5
Rhipidomys mastacalis 17 88.5 11.5
Oligoryzomys nigripes 8 0 0
Nectomys squamipes 7 100 0
Necromys lasiurus 2 97.3 2.7
Echimyidae
Thrichomys apereoides 3 0 0

Germination

We conducted germination experiments only with intact seeds of pioneer species of Melastomataceae and Rubiaceae. In comparison with the control group, germination speed of the gut-passed seeds was significantly higher (p<0.01). Most intact Melastomataceae seeds showed significantly higher germinability compared with the control group in: R. mastacalis (C. urceolata: χ2 = 40.44, df = 1, P < 0.01; and M. holosericea: χ2 = 35.31, df = 1, P <0.01); N. squamipes (C. urceolata: χ2 = 30.55, df = 1, P < 0.01) and N. lasiurus (C. urceolata: χ2 = 22.75, df = 1, P < 0.01). Rubiaceae seeds found in C. subflavus samples did not show higher germinability than that of the control group (Psychotria capitata: χ2 = 7.14, df = 1, P = 0.075; and Psychotria sp.: χ2 = 1.42, df = 1, P = 0.232) (Table 3).

Table 3.

Results of the germination tests in the Control Group (CG) and seeds collected from the feces. Results expressed as total number of seeds tested (number of seeds germinated in %); *p<0.05.

Family/Species Seed size (mm) CG Rhipidomys mastacalis Cerradomys subflavus Necromys lasiurus Nectomys squamipes
Melastomataceae
Clidemia urceolata DC. 1 45 (22%) 19 (89%)* 16 (67%)* 14 (77%)*
Miconia holosericea (L.) DC. 1 45 (26%) 10 (90%)*
Rubiaceae
Psychotria sp. 0.8 20 (30%) 10 (40%)
Psychotria capitata Ruiz and Pav. 2 20 (18%) 13 (38%)

Discussion

The six rodent species recognized as herbivorous or frugivorous (see Paglia et al. 2012) presented a miscellaneous diet, consuming animal preys (arthropods), and plant items (fruits, leaves, stems, and flowers) in different proportions. A similar pattern was also reported for Cricetidae (Pinotti et al. 2011; Sahley et al. 2015) and Echimyidae rodents (Lessa and Costa 2009; Dittel et al. 2015). However, it is important to highlight the high frequency of arthropod occurrence (100%) in the diet of the species studied, reinforcing its importance as a food resource for small neotropical rodents (Talamoni et al. 2008; Lessa and Costa 2009; Pinotti et al. 2011; Sahley et al. 2015), especially in environments with a marked seasonality in resource availability, such as the Cerrado (see Pinheiro et al. 2002; Lessa and Costa 2009). Food availability may determine variations in the diet of some neotropical didelphids (Lessa and Geise 2014; Melo et al. 2019), imposing resource consumption according to their availability in the environment, which could reflect an opportunistic strategy. We recognize, however, that we did not measure food availability in our study site, which limited us to infer a possible opportunistic behavior regarding the diet of the studied rodent species. Nevertheless, based on our results and some studies that compare fruit and arthropod abundance between seasons in the Cerrado, we can hypothesize that the studied rodents may act as opportunistic foragers. In the Cerrado, fruits and arthropods are more abundant in the wet season (Pinheiro et al 2002; Mantovani and Martins 1988). On the other hand, Pinotti et al. (2011) did not observe arthropod consumption proportional to its availability (opportunistic behavior) in a study with some Sigmodontinae rodents in an Atlantic Forest area.

Our results indicate that four (C. subflavus, R. mastacalis, N. squamipes and N. lasiurus) of the six small rodent species studied may act as seed dispersers, that is, consuming fruits and dispersing small seeds (≤ 1 mm length) belonging to pioneer plants. According to Mariano et al. (2019), most seeds reaching the ground in the Cerrado are small ones (≤ 1 mm), exactly the type of seeds that could be dispersed by the rodent assemblage at our study site. When frugivorous dispersers accelerate the germinability of the seeds consumed (as in the case of Melastomataceae seeds in this study), ingested seeds take less time and have more successful germination than the ones that are not ingested (Verdú and Traveset 2004). For the study species, a probable benefit plant may derive from increased germination speed and germinability, which in pioneer plants may improve recruitment (Silveira et al. 2012). In this sense, seeds germinating earlier often have a fitness advantage compared to those that germinate later (Verdú and Traveset 2004. Moreover, reduced germination time may be advantageous in fire-prone habitats such as the Cerrado biome (Mariano et al. 2019). Efficient dispersal by animals may increase opportunities for colonization and provide a fire scape strategy for pioneer plants such as in melastomes from Cerrado (Silveira et al. 2012; Mariano et al. 2019).

Species belonging to the Melastomataceae and Rubiaceae in the Neotropics produce fruits that have been recorded as being consumed and dispersed by small passerines (Tabarelli and Peres 2002; Silveira et al. 2012), didelphid marsupials (Lessa et al. 2010; Cáceres and Lessa 2012; Lessa et al. 2013) and also small rodents (Horn et al. 2008; Vieira et al. 2003; Lessa and Costa 2009; Sahley et al. 2016). The Melastomatomes Clidemia spp. and Miconia spp. produce fleshy fruits rich in sugars and water, being consumed and dispersed primarily by birds (Silveira et al. 2012) and by didelphids marsupials (Lessa et al. 2013). In this study, Clidemia urceolata and Miconia holosericea seeds were consumed and dispersed by the rodents R. mastacalis, N. squamipes and N. lasiurus, with successful germination over 60%, probably as a result of seed coat scarification (Samuels and Levey 2005; Silveira et al. 2012).

The Rubiaceae (Psychotria spp.) fruits are primarily consumed and dispersed by birds (particularly passerines) in the Neotropical region (Tabarelli and Peres 2002). In the same study area, Lessa et al. (2013) recorded the consumption of Rubiaceae fruits, in low proportions, by didelphid marsupials, with negative effects on the successful germination of the seeds ingested. We observed a similar pattern in the present study regarding consumption and dispersion of Psychotria spp. seeds by the rodent C. subflavus. Therefore, the simple passage of the seeds through the disperser digestive tract is not a pre-requisite that guarantees the increase in the germination success of the seeds ingested (Traveset 1998; Samuels and Levey 2005).

The rodent assemblage at our study site consumed a wide variety of food items, especially arthropods and fruits belonging to taxa that generally produce berries with small-seeded fruits. Our results also detected a low proportion of damaged seeds in the scats and confirmed that the seed germination of the ingested seeds was significantly higher than that of non-ingested seeds. Overall, small rodents are recognized specially as seed predators in the Neotropics (Carvajal and Adler 2008; David et al. 2015) but may be an overlooked source of endozoochoric seed dispersal in Neotropical savannas. In this sense, our results highlight the importance of these rodents’ species to the dynamics of plant reproduction, especially for pioneer species belonging to the families Melastomataceae and Rubiaceae.

Acknowledgements

We are grateful to the Instituto Chico Mendes de Conservação da Biodiversidade (ICMBIO) for issuing the license to capture the animals (license no. 19790-1); and to the Instituto Estadual de Florestas de Minas Gerais (IEF/MG, Minas Gerais), for allowing the access to RPSP. Financial support was provided by the Fundação de Amparo a Pesquisa do Estado de Minas Gerais (FAPEMIG/MG) (grant no. APQ 01034/09).

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