Some Demographic Characteristics of the Florida Rosemary Ceratiola ericoides Michx

Johnson, Ann F.

doi:10.2307/2425306

Cited by 58 publications

(63 citation statements)

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“…Specifically, TSF had a non-linear relationship with habitat structure, plant architecture, and leaf quality, where plant density, plant height, and leaf thickness, respectively, initially increased following fire, but later decreased at late-successional stages. Self-thinning is common in many forest and shrub ecosystems (including the Florida scrub) as a response to high competition (Mohler et al 1978;Johnson 1982;Givens et al 1984). …”

Section: The Indirect Effects Of Fire On Herbivore Communitiesmentioning

confidence: 99%

The direct and indirect effects of fire on the assembly of insect herbivore communities: examples from the Florida scrub habitat

Kim

Holt

2011

Oecologia

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Disturbance is a major source of spatial and temporal heterogeneity. In fire-maintained systems, disturbance by fire is often used as a management tool to increase biological diversity, restore degraded habitats, and reduce pest outbreaks. Much attention has been given to how plant communities recover from fire, but relatively few studies have examined post-fire responses of higher order species, such as insect herbivores. Because dynamic feedbacks occur between plants and their consumers, which can in turn influence the response of the entire ecosystem, incorporating higher trophic level responses into our understanding of the effects of fire is essential. In this study, we used structural equation modeling (SEM) to tease apart the direct and indirect effects of fire on insect herbivore assemblages found on three common oak species in the Florida scrub (Quercus inopina, Q. chapmanii, and Q. geminata). We investigated how fire affected herbivore abundance, richness, and community composition both directly and indirectly through environmental heterogeneity at different spatial scales (e.g., leaf quality, plant architecture, and habitat structure). We also investigated how seasonality and landscape heterogeneity influenced post-fire responses of insect herbivores and whether fire effects on herbivore assemblages varied among different host plants. Our general findings were that fire effects were (1) largely indirect, mediated through habitat structure (although direct fire effects were observed on Q. inopina herbivores), (2) non-linear through time due to self-thinning processes occurring in the scrub habitat, and (3) varied according to herbivore assemblage as a result of differences in the composition of species in each herbivore community. To the best of our knowledge, this is the first comprehensive study to examine how fire influences the assembly of insect herbivore communities through both direct and indirect pathways and at multiple spatial scales.

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Section: The Indirect Effects Of Fire On Herbivore Communitiesmentioning

confidence: 99%

The direct and indirect effects of fire on the assembly of insect herbivore communities: examples from the Florida scrub habitat

Kim

Holt

2011

Oecologia

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“…Since remnant flowers and fruits persist in all seasons, reproductive shrubs are easily sexed. C. ericoides has a whorled branching pattern with the main unshaded branches producing new shoots once a year, therefore shrubs can be aged nondestructively by counting the nodes on the main branches (Johnson 1982). The fruits of C. ericoides are apparently dispersed by vertebrates and birds such as towhees are known to consume them.…”

Section: Study Speciesmentioning

confidence: 99%

“…The fruits of C. ericoides are apparently dispersed by vertebrates and birds such as towhees are known to consume them. Harvester ants have also been observed to collect and consume the fruits of C. ericoides (Johnson 1982). …”

Section: Study Speciesmentioning

confidence: 99%

Sex ratio and spatial pattern of males and females in the dioecious sandhill shrub, Ceratiola ericoides ericoides (Empetraceae) Michx

Schmidt

2007

Plant Ecol

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Sex ratio, size, age, and spatial pattern were investigated for males and females of the dioecious shrub Ceratiola ericoides ericoides (Empetraceae) Michx. within seven mapped populations in Georgia and South Carolina, USA. Among the sites studied, two are regularly burned and one site long-unburned. Age was estimated from node counts of individual shrubs. Only one (fire-suppressed) population showed a female-biased sex ratio, while all others did not differ significantly from 1:1. Mean age estimates did not differ between sexes at any site nor did mean shrub canopy diameter. Bivariate Ripley's K analysis with a null hypothesis of random labeling was used to investigate whether any of the mapped populations exhibited spatial segregation of the sexes (SSS). No population showed strong evidence of SSS. Rather all sites but one showed males and females to be associated (though not significantly) at a scale of 1-10 m. At a scale of 10-35 m male and female shrubs were located randomly with respect to one another at all sites.

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“…In the areas between shrubs, several lichens in the genera Cladonia and Cladina frequently account for more ground cover than herbaceous plants, particularly in long-unburned stands, where they can form almost continuous carpets (Abrahamson et al 1984). Occasional high-intensity ®res kill standing Florida rosemary individuals, enlarge open sand areas and decrease lichen cover (Johnson 1982;Abrahamson et al 1984;Abrahamson 1984a, b;Myers 1985Myers , 1990Menges and Kohfeldt 1995;Hawkes and Menges 1996). The slow recovery growth rate of Florida rosemary and lichens, and limited colonization of available space by other woody species, allow large openings to persist in the rosemary scrub for decades after a ®re (Johnson et al 1986;Hawkes and Menges 1996).…”

Section: Introductionmentioning

confidence: 99%

Fire-mediated effects of shrubs, lichens and herbs on the demography of Hypericum cumulicola in patchy Florida scrub

Quintana‐Ascencio

Morales-Hernández

1997

Oecologia

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Understanding the effect of disturbance and interspecific interactions on population dynamics and availability of suitable habitats for colonization and growth is critical for conservation and management of endangered species. Hypericum cumulicola is a narrowly endemic, small perennial herb virtually restricted to open areas of well-drained white sand in Florida rosemary scrub, a naturally patchy community that burns about every 20-80 years. Over 1 year (September 1994 to September 1995) we evaluated variation in survival, growth and fecundity among 1214 individuals in 14 rosemary scrub patches of different sizes (0.09-1.85 ha) and fire histories (2, 8-10, and >20 years since the last fire). Fire kills aboveground individuals of H. cumulicola, but new individuals were present a year after fire. Recruitment decreased in patches more than a decade post-fire. Survival, annual height growth rate, and fecundity (number of flowers and fruits) were higher in recently burned patches. Scrub patch size did not affect these demographic variables. Survival was positively associated with the presence of conspecifics and negatively related to proximity to the dominant shrub Florida rosemary (Ceratiola ericoides), prior reproductive output, and ground lichen cover. Since H. cumulicola and other herbaceous species in the rosemary scrub depend on sporadic fires to decrease interference of shrubs and ground lichens, its persistence may be threatened by fire suppression.

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Some Demographic Characteristics of the Florida Rosemary Ceratiola ericoides Michx

Cited by 58 publications

References 0 publications

The direct and indirect effects of fire on the assembly of insect herbivore communities: examples from the Florida scrub habitat

The direct and indirect effects of fire on the assembly of insect herbivore communities: examples from the Florida scrub habitat

Sex ratio and spatial pattern of males and females in the dioecious sandhill shrub, Ceratiola ericoides ericoides (Empetraceae) Michx

Fire-mediated effects of shrubs, lichens and herbs on the demography of Hypericum cumulicola in patchy Florida scrub

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