The fungal rat race: mycophagy among rodent communities in eastern Australia
Context. Rodents in many parts of the world perform an important ecosystem function as dispersers of mycorrhizal fungal spores. These fungi are vital to nutrient uptake in plant communities, but many of the fungal taxa that form these associations have fruiting bodies that are reliant on animals for their spore dispersal. Aims. Numerous studies have focused on the ecological importance of Australian marsupials (especially members of the Potoroidae) for the dispersal of these ecologically important fungi. We chose to focus this study on the role of murid rodents in the dispersal of these fungi in eastern Australia. Methods. To compare fungal taxa in murid diets, we trapped rodents in three regions of eastern Australia; our study sites spanned over 2000 km from temperate eucalypt forests to tropical eucalypt and tropical rainforest habitats. We performed microanalysis on all scats to determine whether fungi were consumed and which taxa were being eaten. Statistical analysis was conducted to investigate trends in levels of mycophagy among species and habitats. Key results. We examined 10 rodent species, and all were shown to ingest mycorrhizal fungi to varying degrees. The diversity, abundance and specific fungal taxa consumed varied depending on the site and forest type. In drier forests dominated by Eucalyptus spp., the fungal taxa consumed and dispersed were primarily ectomycorrhizal; in wetter rainforest habitats, the fungal diversity consumed was far lower and included primarily vesicular arbuscular fungi. We provide the first evidence of mycophagy by grassland melomys (Melomys burtoni) and Cape York melomys (Melomys capensis). Conclusions. Our findings highlight the importance of rodents as dispersers of mycorrhizal fungi across a variety of habitats from temperate to tropical forests of eastern Australia. Implications. This study increases the existing knowledge of rodent diets and habitat requirements. It also provides a new angle for mammal conservation efforts, given the vital nature of the ecosystem service provided by these small and frequently overlooked mammals.
Ecological Implications of Primary and Secondary Dispersal of Fungi by Vertebrates
Fungal consumption (mycophagy) by vertebrates has been reported for numerous species, but until this thesis, there has been no global synthesis of the topic. Through a combination of novel research and comprehensive literature reviews, I investigated the ecological implications of vertebrate mycophagy for fungal spore dispersers, fungal ecology, plant ecology, animal food choice and animal behaviour. This thesis demonstrates that vertebrate mycophagy directly impacts most terrestrial ecosystems and is especially relevant to many plants, animals and fungi. I have taken three different methodological approaches in this thesis.
First, I systematically reviewed mycophagy among all terrestrial vertebrate taxa. This extensive global literature review yielded three chapters (and manuscripts): one on mammals, another on reptiles and a third on birds (Chapters 2, 6 and 7, respectively). These reviews of approximately 1,500 references in more than five languages report mycophagy among nearly 600 mammals, reptiles and birds. (Despite an exhaustive search, I could find no evidence of amphibian mycophagy.) These reviews lay the groundwork for and are integral parts of my thesis.
Second, I directly studied vertebrate mycophagy through observations and/or faecal and stomach analyses (Chapter 3, 4, 5 and 8). I collected empirical dietary data through microanalysis of animal scats acquired by live-trapping animals or by examining stomach contents of preserved museum collections. I obtained observational feeding data by watching wild animals directly, or by deploying motion-activated camera traps that recorded the behaviours of mycophagists. These studies provided new dietary data for vertebrates and showcased the previously overlooked ecological services that they provide.
Third, I used a modelling approach to determine the dispersal potential of primary and secondary mycophagy (Chapter 5 and Supplementary Material). By using a combination of passage rate data and movement patterns gathered from animals fitted with GPS tracking devices, I was able to show that some animals have the potential to disperse mycorrhizal fungal spores more than 10 km from the point of ingestion (Chapter 5). This is the first application of modelling to mycophagy research and the first direct investigation of secondary spore dispersal.
This thesis presents novel concepts about mycophagy and an in-depth study of the ecological importance of associations between vertebrates and fungi around the world.
Observations of the impact of bushfire on a community of myxomycetes
In this study, we examined the impacts of a bushfire on a community of myxomycetes (also known as plasmodial slime moulds or myxogastrids) in northeastern New South Wales, Australia. Using the moist chamber culture technique, we prepared 40 moist chamber cultures from four different substrates. We collected the same four types of substrates on either side of a fire line approximately six months post-fire in order to assess what impact fire had on the myxomycete communities. Sixty percent of moist chamber cultures yielded evidence (plasmodia or fruiting bodies) of myxomycetes representing eleven species in eight genera. But only 40% of samples from the burned site were positive for myxomycetes, and only one species produced fruiting bodies. In contrast, 80% of samples from the unburned site were positive, and all eleven species were recorded. These data suggest that fire reduced the abundance and diversity of the myxomycete community at our site.
Diets of mammalian carnivores in the deserts of north-eastern South Australia
We studied diets of feral cats (Felis catus), dingoes (Canis familiaris) and red foxes (Vulpes vulpes) in desert environments in north-eastern South Australia by analysing prey remains in opportunistically-collected scats. Four major landscapes were sampled (Simpson Desert, Sturt Stony Desert, Strzelecki Desert - Cooper Creek and Diamantina River) which yielded 238 cat scats, 298 dingo scats and ten fox scats. There was some overlap in prey eaten by cats and dingoes, but their diets were significantly different because cats typically ate small prey such as small mammals, small lizards and birds, while dingoes ate larger prey like domestic cattle, kangaroos and large reptiles. The few fox scats collected suggested fox diets were more similar to cat than dingo diets. Scat composition also differed significantly between landscapes irrespective of predator, with landscapes differing both in diversity and relative abundances of prey consumed. We detected several species in scats that are threatened with extinction either nationally (dusky hopping mouse, Notomys fuscus, and crest-tailed mulgara, Dasycercus cristicauda) or regionally (desert mouse, Pseudomys desertor, and long-haired rat, Rattus villosissimus), adding valuable knowledge to the distribution of these mammals and demonstrating the value of predator scat analyses in mammal surveys of Australian deserts.
Reptilian Mycophagy: A global review of mutually beneficial associations between reptiles and macrofungi
Macrofungi are an important food source for many mammals, birds and arthropods; in return, these animals disperse numerous species of fungi through their scats. Many of the fungi that are important as food also perform key functions in the ecosystem through nutrient cycling. Research on associations between reptiles and fungi has primarily focused on pathology and has mostly overlooked mutually beneficial relationships between these two groups of organisms and the positive impacts of their associations on overall ecosystem health. There is a substantial body of disparate research showing the importance of turtles as seed dispersers, but we provide the first study evaluating the ecological implications of turtles and other reptiles as macrofungi spore dispersers. These associations have been less thoroughly studied than those between mammals and fungi, yet we show that they have similar ecological importance. In this review, we present the most comprehensive summary to date of reptile species reported to eat fungi (42 reptile species in 7 families) and outline the potential importance of reptiles as spore dispersers for fungi that play a positive role in ecosystem dynamics. We also show that oversights in the methodology of past dietary studies may have led to false representation of the role of fungi in reptile diets, and we make recommendations for future dietary studies involving reptiles.
Hypogeous fungus foray in Australia
As part of an effort started in the 1980's by Dr. Jim Trappe to survey the truffle diversity of Australia, we held the first annual Barrington Tops Hypogeous Fungus Foray June 28th to July 1st. About 20 enthusiastic truffle collectors from New South Wales and Queensland joined us at beautiful Wangat Lodge just outside of Barrington Tops National Park (Fig. 1). Barrington Tops National Park is a World Heritage-listed site.
New host record for Entylia carinata (Forster) (Hemiptera: Membracidae)
Yacon, Smallanthus sonchifolius (Poepp.) H. Rob (Asteraceae), is recorded as a new host plant for Entylia carinata (Forster) (Hemiptera: Membracidae) in Mt. Holly, NC. Adults, nymphs, and attending ants were found on numerous plants.
New and Interesting Fungi. 5
Nine new genera, 17 new species, nine new combinations, seven epitypes, three lectotypes, one neotype, and 14 interesting new host and / or geographical records are introduced in this study. New genera: Neobarrmaelia (based on Neobarrmaelia hyphaenes), Neobryochiton (based on Neobryochiton narthecii), Neocamarographium (based on Neocamarographium carpini), Nothocladosporium (based on Nothocladosporium syzygii), Nothopseudocercospora (based on Nothopseudocercospora dictamni), Paracamarographium (based on Paracamarographium koreanum), Pseudohormonema (based on Pseudohormonema sordidus), Quasiphoma (based on Quasiphoma hyphaenes), Rapidomyces (based on Rapidomyces narthecii). New species: Ascocorticium sorbicola (on leaves of Sorbus aucuparia, Belgium), Dactylaria retrophylli (on leaves of Retrophyllum rospigliosii, Colombia), Dactylellina miltoniae (on twigs of Miltonia clowesii, Colombia), Exophiala eucalyptigena (on dead leaves of Eucalyptus viminalis subsp. viminalis supporting Idolothrips spectrum, Australia), Idriellomyces syzygii (on leaves of Syzygium chordatum, South Africa), Microcera lichenicola (on Parmelia sulcata, Netherlands), Neobarrmaelia hyphaenes (on leaves of Hyphaene sp., South Africa), Neobryochiton narthecii (on dead leaves of Narthecium ossifragum, Netherlands), Niesslia pseudoexilis (on dead leaf of Quercus petraea, Serbia), Nothocladosporium syzygii (on leaves of Syzygium chordatum, South Africa), Nothotrimmatostroma corymbiae (on leaves of Corymbia henryi, South Africa), Phaeosphaeria hyphaenes (on leaves of Hyphaene sp., South Africa), Pseudohormonema sordidus (on a from human pacemaker, USA), Quasiphoma hyphaenes (on leaves of Hyphaene sp., South Africa), Rapidomyces narthecii (on dead leaves of Narthecium ossifragum, Netherlands), Reticulascus parahennebertii (on dead culm of Juncus inflexus, Netherlands), Scytalidium philadelphianum (from compressed air in a factory, USA). New combinations: Neobarrmaelia serenoae, Nothopseudocercospora dictamni, Dothiora viticola, Floricola sulcata, Neocamarographium carpini, Paracamarographium koreanum, Rhexocercosporidium bellocense, Russula lilacina. Epitypes: Elsinoe corni (on leaves of Cornus florida, USA), Leptopeltis litigiosa (on dead leaf fronds of Pteridium aquilinum, Netherlands), Nothopseudocercospora dictamni (on living leaves of Dictamnus albus, Russia), Ramularia arvensis (on leaves of Potentilla reptans, Netherlands), Rhexocercosporidium bellocense (on leaves of Verbascum sp., Germany), Rhopographus filicinus (on dead leaf fronds of Pteridium aquilinum, Netherlands), Septoria robiniae (on leaves of Robinia pseudoacacia, Belgium). Lectotypes: Leptopeltis litigiosa (on Pteridium aquilinum, France), Rhopographus filicinus (on dead leaf fronds of Pteridium aquilinum, Netherlands), Septoria robiniae (on leaves of Robinia pseudoacacia, Belgium). Neotype: Camarographium stephensii (on dead leaf fronds of Pteridium aquilinum, Netherlands).
Morchella australiana sp. nov., an apparent Australian endemic from New South Wales and Victoria
An abundant fruiting of a black morel was encountered in temperate northwestern New South Wales (NSW), Australia, during a mycological survey in Sep 2010. The site was west of the Great Dividing Range in a young, dry sclerophyll forest dominated by Eucalyptus and Callitris north of Coonabarabran in an area known as the Pilliga Scrub. Although the Pilliga Scrub is characterized by frequent and often large, intense wildfires, the site showed no sign of recent fire, which suggests this species is not a postfire morel. Caps of the Morchella elata-like morel were brown with blackish ridges supported by a pubescent stipe that became brown at maturity. Because no morel has been described as native to Australia, the collections were subjected to multilocus molecular phylogenetic and morphological analyses to assess its identity. Results of these analyses indicated that our collection, together with collections from NSW and Victoria, represented a novel, genealogically exclusive lineage, which is described and illustrated here as Morchella australiana T. F. Elliott, Bougher, O’Donnell & Trappe, sp. nov.
Turkish truffles 2: eight new records from Anatolia
Eight truffle taxa are identified as new records for Turkey: two representing Ascomycota (Tuber ferrugineum, Tuber puberulum) and six representing Basidiomycota (Hymenogaster rehsteineri, Hysterangium calcareum, Leucophleps aculeatispora, Melanogaster macrosporus, Sclerogaster compactus, Sclerogaster hysterangioides). We also report new localities within Turkey for Tuber borchii and Melanogaster ambiguus.
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