Folivory in the white‐tipped plantcutter <i>Phytotoma rutila</i>: seasonal variations in diet composition and quality

Bucher, Enrique H.; Tamburini, Daniela; Abril, Adriana; Torres, Patricia

doi:10.1034/j.1600-048x.2003.03020.x

Cited by 24 publications

(20 citation statements)

References 16 publications

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“…Among herbivorous mammals, these two extremes are well exemplified by, respectively, Giant pandas ( Ailuropoda melanoleuca ), which digest less than 10% of cellulose and hemicellulose in ingested bamboo (122) and gorillas, which can digest 45% to 70% of cell-wall material in their herbivorous diet (377). Among birds, examples of cytoplasm consumers would be “plant cutters” (genus Phytotoma ) that feed almost exclusively on young leaves (with low cell-wall contents) (46) whereas hoatzins ( Ophistocomus hoazin ) and some species of grouse consume leaves, buds, and tips of woody twigs and may digest a lot of the cell-wall material (195). A continuum of feeders/digesters bounded by these two strategies can be found among invertebrate taxa as well.…”

Section: Digestive Designs That Match Gi Architecture To Food Composimentioning

confidence: 99%

Comparative Digestive Physiology

Karasov

Douglas

2013

Comprehensive Physiology

263

221

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In vertebrates and invertebrates, morphological and functional features of gastrointestinal (GI) tracts generally reflect food chemistry, such as content of carbohydrates, proteins, fats, and material(s) refractory to rapid digestion (e.g., cellulose). The expression of digestive enzymes and nutrient transporters approximately matches the dietary load of their respective substrates, with relatively modest excess capacity. Mechanisms explaining differences in hydrolase activity between populations and species include gene copy number variations and single-nucleotide polymorphisms. Transcriptional and posttranscriptional adjustments mediate phenotypic changes in the expression of hydrolases and transporters in response to dietary signals. Many species respond to higher food intake by flexibly increasing digestive compartment size. Fermentative processes by symbiotic microorganisms are important for cellulose degradation but are relatively slow, so animals that rely on those processes typically possess special enlarged compartment(s) to maintain a microbiota and other GI structures that slow digesta flow. The taxon richness of the gut microbiota, usually identified by 16S rRNA gene sequencing, is typically an order of magnitude greater in vertebrates than invertebrates, and the interspecific variation in microbial composition is strongly influenced by diet. Many of the nutrient transporters are orthologous across different animal phyla, though functional details may vary (e.g., glucose and amino acid transport with K+ rather than Na+ as a counter ion). Paracellular absorption is important in many birds. Natural toxins are ubiquitous in foods and may influence key features such as digesta transit, enzymatic breakdown, microbial fermentation, and absorption

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Section: Digestive Designs That Match Gi Architecture To Food Composimentioning

confidence: 99%

Comparative Digestive Physiology

Karasov

Douglas

2013

Comprehensive Physiology

263

221

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“…Si lo comparamos con las estaciones en El Gramadal vemos que durante los meses de invierno P. raimondii también se alimenta de brotes de Prosopis pallida, mientras que en los meses de verano lo hemos visto alimentándose de frutos de Grabowskia boerhaaviifolia. Phytotoma rutila en Córdoba, Argentina (Bucher et al 2003) consumía Prosopis alba y P. nigra a lo largo del año pero con menores valores en verano; de las 4 especies que más consumia (Lycium cestroides, Prosopis spp. Celtis tala y Schinus longifolius), Lycium (SOLANACEA) tenía los valores más altos de proteína a lo largo del año pero Prosopis spp.…”

Section: Discussionunclassified

Reproduction and food habits and of Phytotoma raimondii, Peruvian Plantcutter in El Gramadal, Ancash

Rosina

Romo²

2012

Rev peru biol

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The occurrence of good habitat with suitable food and sites for reproduction for the Peruvian plantcutter at El Gramadal (Huarmey) is confirmed. The two most important species for food “algarrobo” (Prosopis pallida) and “palo negro” (Grabowskia boerhaviifolia) both occur in sufficient amount in this place. The last species is also crucial for the reproduction since all the nests found were in this species. To date 9 nests have been found during 2010 and 2012 and between December and April: seven active nests, 2 in 2010 (April) and 4 in 2011(March and December) and 1 in 2012 (January). In addition, two empty nests were found in 2011 (March and June), and fledglings and juveniles from December to June.

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“…However, this statement remains elusive because most, if not all, herbivorous bird studies claiming selection for nitrogen-rich food (e.g. Bucher et al 2003;Sedinger 1997) failed to measure metabolisable energy content or intake simultaneously with the nitrogen budget. Based on biological stoichiometry principles, Klaassen and Nolet (2008) argue that the protein requirements of endotherms can be satisfied by eating most plants.…”

Section: Discussionmentioning

confidence: 99%

Shifting to an energy-poor diet for nitrogen? Not the case for wintering herbivorous Lesser White-fronted Geese in China

et al. 2014

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Geese often forage on mid-winter foods that fail to satisfy daily energy needs, but they may do so to acquire other nutrients, such as nitrogen. We tested this hypothesis by evaluating nitrogen budgets, namely the balance of nitrogen income against expenditure, of wintering Lesser White-fronted Geese Anser erythropus feeding at two sites within East Dongting Lake, China, where they could and could not balance daily energy budgets. Geese could balance nitrogen budgets in energy-rich habitats but were less able to do so in habitats where they failed to balance energy budgets. This study presents the first full nitrogen budget for a wintering goose species, and suggests that, rather than acting as a source of nitrogen, use of energy-poor but undisturbed habitats may represent a refuge from human disturbance at other habitats.Keywords East Dongting Lake Á Energy budget Á Foraging decisions Á Nitrogen budget Á Recessional grasslands Á Uric acid

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Folivory in the white‐tipped plantcutter Phytotoma rutila: seasonal variations in diet composition and quality

Cited by 24 publications

References 16 publications

Comparative Digestive Physiology

Comparative Digestive Physiology

Reproduction and food habits and of Phytotoma raimondii, Peruvian Plantcutter in El Gramadal, Ancash

Shifting to an energy-poor diet for nitrogen? Not the case for wintering herbivorous Lesser White-fronted Geese in China

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