Seasonal Niche Dynamics in Coexisting Rodents of the Brazilian Cerrado
Bibliographic record
Abstract
Microhabitat selection, diet breadth and overlap in seasons of low and high population density were used to evaluate the likelihood of interspecific competition in a rodent assemblage of the cerrado, a tropical savannah of Brazil. Four species of rodents – one Echimyidae and three Muridae – were live-trapped from September 1985 to September 1986 in a 1.32 ha grid in the State of São Paulo, Brazil. Microhabitat preference and space niche were measured by captures in six microhabitat categories, and food niche by the relative proportions in the feces of monocot, dicot, seed, and arthropod remains. Clyomys bishopi, a herbivore, was the most specialized species in diet and microhabitat, whereas Oligoryzomys eliurus and Bolomys lasiurus were the most generalist species in microhabitat and diet respectively. Overall, species had different microhabitat preferences. Breadth and overlap in microhabitat preference were higher in the high-density season, whereas breadth of diet was higher in the low-density season. Microhabitat breadth and mean microhabitat overlap were positively correlated between species, but not diet breadth and mean diet overlap when C. bishopi was excluded. Interspecific competition for microhabitats is unlikely, but could occur for food between the three murid species in low density seasons. Resumo Seleção de microhabitats, largura e sobreposição de dietas em estaç[otilde]es de baixa e alta densidade foram utilizados para avaliar a probabilidade de competição interespecífica num agrupamento de roedores do cerrado. Quatro roedores – um Echimyidae e três Muridae – foram marcados e recapturados de setembro de 1985 a setembro de 1986 numa grade de armadilhas de 1.32 ha, no Estado de São Paulo, Brazil. Preferência de microhabitats e nicho espacial foram medidos por capturas em seis categorias de microhabitats; nicho alimentar pelas proporç[otilde]es relativas de restos nas fezes de monocotiledôneas, dicotiledôneas, sementes e artrópodes. Clyomys bishopi, um herbívoro, foi o mais especializado em dieta e microhabitat, enquanto Oligoryzomys eliurus e Bolomys lasiurus foram os mais generalistas em microhabitat e dieta, respectivamente. As espécies tiveram preferências distintas por microhabitats, com excessão de C. bishopi e B. lasiurus. Largura e sobreposição em preferência de microhabitats foram maiores na estação de alta densidade, enquanto largura de dieta foi maior na estação de baixa densidade. Largura e sobreposição média de nichos foram correlacionados positivamente para microhabitat, mas não dieta. Competição interespecífica por microhabitats é improvável, mas poderia ocorrer por alimento entre as três espécies de murídeos em estaç[otilde]es de baixa densidade.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".