Influence of temporal variation and seasonality on population dynamics of three sympatric rodents

Rocha, Clarisse R.; Ribeiro, Raquel; Marinho‐Filho, Jader

doi:10.1016/j.mambio.2017.01.001

Cited by 18 publications

(20 citation statements)

References 55 publications

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“…That Julian date appeared to not influence other species of cricetids in a similar manner suggests that in our system temporal variation can influence species population dynamics differently, as has been revealed for rodents in other systems (Rocha et al. ).…”

Section: Discussionsupporting

confidence: 81%

Group effects of a non‐native plant invasion on rodent abundance

2019

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Cheatgrass (Bromus tectorum) is the most prolific invading plant in western North America.Investigations determining the impact of this invasion on population state variables and community dynamics of rodents have largely occurred at the community or species level, creating a knowledge gap as to whether rodents affiliated by a shared taxonomy or other grouping are differentially affected by cheatgrass invasion. We examined rodent abundance along a gradient of cheatgrass cover using various groupings of two nocturnal rodent taxa comprising the majority of the rodent community in the Great Basin Desert. In the summers of 2010-2013, rodents were sampled and vegetation was measured on the U.S. Army Dugway Proving Ground in the Great Basin Desert of Utah, USA. We separately examined estimates of rodent abundance for all combined species within the Cricetidae and Heteromyidae families, the most numerically dominant species, and uncommon species pooled in relation to cheatgrass invasion severity. We detected an expected negative linear relationship between invasion severity and abundance for all cricetid groupings, including the most numerically dominant species, the deer mouse (Peromyscus maniculatus). Unexpectedly, heteromyid abundance exhibited an initial positive relationship, reached a threshold, and then exhibited a negative relationship, a phenomenon driven by Ord's kangaroo rats (Dipodomys ordii), the most numerically dominant species. We speculate this non-linear finding was caused by a combination of trophic and nontrophic pathways. Our findings provide new insight as to the potential for differential effects of cheatgrass on rodents in arid portions of the western United States. We suggest that future investigations on cheatgrass, and plant invader effects in general, consider parsing animal communities of interest by various taxonomic and/or ecological groupings rather than focusing exclusively on individual species or entire communities.

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Section: Discussionsupporting

confidence: 81%

Group effects of a non‐native plant invasion on rodent abundance

2019

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“…Somente no campo montano a temperatura influenciou negativamente a riqueza e abundância de pequenos mamíferos terrestres. Essa redução em relação ao aumento da temperatura pode estar relacionada a uma série de aspectos, tais como: as características inerentes às espécies com padrões comportamentais específicos relacionados a maiores índices pluviométricos que estimulam o início do ciclo reprodutivo, situação comum para espécies generalistas e adaptadas a áreas abertas como N. lasiusus, por exemplo (Cerqueira, 2005;Rocha et al, 2017;Ferreira et al, 2017). Além disso, esses ambientes apresentam maior quantidade de recursos em períodos mais quentes, facilitando o acesso a fontes de alimento (Barros-Battesti et al, 2000;Bergallo & Magnusson, 2004), reduzindo a procura por recurso.…”

Section: Discussionunclassified

“…O clima influencia diversos processos, como demografia (Lavergne et al, 2010), e padrões ecológicos, como mudanças na composição de comunidades (Moritz et al, 2008), influenciando diferentes grupos taxonômicos como anfíbios (Pounds & Crump, 1994), roedores (e.g. Rocha et al, 2017) e marsupiais (e.g. Ferreira et al, 2017).…”

Section: Introductionunclassified

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Influência da Temperatura e Umidade Relativa sobre Pequenos Mamíferos em Fitofisionomias de Elevada Altitude no Sudeste Brasileiro

Machado

Moura

Mariano

et al. 2019

Revista Brasileira De Zoociências

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A temperatura e umidade relativa (UR) são dois parâmetros abióticos que influenciam na ocorrência de diferentes espécies, corroborando com trabalhos de flutuações sazonais populacionais, e alterações na composição de comunidades. Porém, existem poucos estudos que correlacionam esses fatores com riqueza e abundância de pequenos mamíferos terrestres em fitofisionomias de elevada altitude. Portanto, este trabalho teve o objetivo de analisar a influência da UR e temperatura do ar sobre a riqueza e abundância dos pequenos mamíferos terrestres em três diferentes fitofisionomias: campo natural montano, florestas semideciduais e florestas nebulares, na Chapada das Perdizes, sudeste brasileiro. Foram utilizadas armadilhas de chapa (Sherman), arame (Tomahawk) e queda (Pitfall) em conjunto com termo higrômetros em fitofisionomias de elevada altitude na Chapada das Perdizes, sudeste brasileiro. A temperatura e umidade relativa não diferiram entre os ambientes florestais montanos e não influenciam a riqueza e abundância de pequenos mamíferos, resultado da proteção e estabilidade proporcionada pela floresta. Porém, existe influência desses parâmetros para os campos naturais montanos, onde houve redução da riqueza e abundância de espécies em função do aumento da temperatura do ar.

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“…obs., 2015), and the population abundance of the most common rodents in Cerrado shows no large fluctuations in abundance across the year (Rocha et al . 2017), we joined data from both sites to increase power in statistical tests. The final models were selected from the full factorial models by the stepwise backward method using the likelihood ratio test (Zuur et al .…”

Section: Methodsmentioning

confidence: 99%

Seed abundance affects seed removal of an alien and a native tree in the Brazilian savanna: Implications for biotic resistance

2020

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Invasive species are among the major threats to global biodiversity. Plant invasions are often driven by great propagule pressure that overcomes barriers to early colonisation and establishment, such as the biotic resistance from pathogens and seed predators. However, the way in which biotic resistance interacts with propagule pressure and affects seed survival remains poorly understood. Here, we experimentally assessed the effect of seed abundance on seed removal in the Brazilian Cerrado (savanna). We tested whether the invasive Leucaena leucocephala and the native Anadenanthera macrocarpa (both Fabaceae) differ in post-dispersal seed removalan indicator of granivore pressureby different guilds of seed predators, varying seed abundance (2, 5 or 10 seeds of each species per treatment) and distance from a disturbance (5, 20 and 50 m from a firebreak) in two fragments of Cerrado. Treatment encounter, that is the chance of at least one seed being removed, increased 72% from 2 to 10 seeds per treatment, but seed removal increased only by 32%, suggesting a threshold in granivore response to seed availability. Native seeds suffered higher removal than exotic seeds, but removal rates did not vary with distance to disturbance or interact with vertebrate and invertebrate exclusions. Our results suggest a patchy pattern of seed predation influenced by resource abundance and emphasise the efficiency of high propagule pressure in overcoming the density-dependent biotic resistance during early stages of exotic plant invasions in Cerrado. Seeds of fast-germinating species, such as L. leucocephala, that reach appropriate spots for regeneration may still overcome the biotic resistance due to the patchy nature of seed predation.

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Influence of temporal variation and seasonality on population dynamics of three sympatric rodents

Cited by 18 publications

References 55 publications

Group effects of a non‐native plant invasion on rodent abundance

Group effects of a non‐native plant invasion on rodent abundance

Influência da Temperatura e Umidade Relativa sobre Pequenos Mamíferos em Fitofisionomias de Elevada Altitude no Sudeste Brasileiro

Seed abundance affects seed removal of an alien and a native tree in the Brazilian savanna: Implications for biotic resistance

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