Reconstructing a century of <i>Spartina alterniflora</i> invasion with historical records and contemporary remote sensing

Civille, Janie C.; Sayce, Kathleen; Smith, Stuart D.; Strong, Donald R.

doi:10.2980/i1195-6860-12-3-330.1

Cited by 56 publications

(61 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In decimal degrees, Willapa bay covers ca 46.37°to 46.75°and -124.380 to -124.10°(in decimal degrees, north and east are ?). Color infrared photography is preferred for studies of marsh vegetation because it provides clear delineation between vegetation, water, and the wet intertidal substrates in this study (Civille et al 2005). Infrared radiation is strongly absorbed by water but strongly reflected by healthy vegetation.…”

Section: Datamentioning

confidence: 99%

“…The color infrared photographs were made from fixed-wing aircraft during surveys made by the state of Washington in 1994, 1997, and 2000. Scanning, orthorectification, and data processing followed Civille et al (2005). Positional accuracy was calculated in relation to black and white digital orthophotographs from 1992 produced by the Washington Sate Department of Natural Resources Photogrammetry Unit; the reference orthophotographs had positional errors (RMSE) less than 1 m, with 39 cm 9 39 cm pixels.…”

Section: Datamentioning

confidence: 99%

“…Maritime cordgrasses, Spartina spp., disperse by seeds that float on the tide; there is not a seed bank and clonal fragmentation contributes little to spread of these plants (Civille et al 2005, Strong andAyres 2009). Each clone thus arose from a seed that arrived by floating before germination and not from clonal fragments eroded from another plant.…”

Section: Introductionmentioning

confidence: 99%

“…Spartina alterniflora probably arrived in Willapa Bay at the end of the nineteenth century with live oyster shipments by rail from Atlantic marshes (Civille et al 2005). The first Willapa Bay record is a 1940 photograph of a huge S. alterniflora clone with an estimated diameter of 42 m. The long term historical trend of total S. alterniflora cover in Willapa Bay describes an almost straight semilog line over the eight data points from 1940 through the year 2000, with an average annual areal growth rate of about 12% (Civille et al 2005, Fig.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Lateral spread of invasive Spartina alterniflora in uncrowded environments

Dennis

Civille²,

Strong

2010

Biol Invasions

Self Cite

View full text Add to dashboard Cite

We present a stochastic model of clonal growth in uncrowded environments and use it to study data of 7,536 clones from the invasion of Willapa Bay, Washington by the Atlantic cordgrass Spartina alterniflora. The model incorporates effects on clone growth of covariates, spatial autocorrelation, and temporal trends. The deterministic component of the model assumes that growth rate of a clone's area is proportional to its perimeter, resulting in constant radial growth of the clone. The full stochastic model is built assuming that the fluctuations of radial growth increments (differences of square root-transformed areas) are normally distributed with constant variance. Graphical fit analysis with the density probability plot technique indicates that the stochastic model provides an excellent description of the S. alterniflora invasion. Variation in Spartina growth was significantly but weakly (5%) related to intertidal elevation, substrate type, year of survey, and the twoway interactions between these variables, suggesting that factors intrinsic to Spartina, along with localized high frequency noise, dominate the effects of larger scale abiotic factors on clone growth. Our model of clonal growth is potentially applicable to other systems with approximately circular plants or lichens.

show abstract

Section: Datamentioning

confidence: 99%

Section: Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Lateral spread of invasive Spartina alterniflora in uncrowded environments

Dennis

Civille²,

Strong

2010

Biol Invasions

Self Cite

View full text Add to dashboard Cite

show abstract

“…27% of intertidal lands in Willapa Bay, WA during the ca. 110 years since its introduction was the result of floating seed carried on currents, rather than dispersion of rhizome fragments (Civille et al, 2005). Anemophilous Spartina pollination can be surprisingly local.…”

Section: Introductionmentioning

confidence: 99%

Spatial and temporal genetic structure in a hybrid cordgrass invasion

2010

View full text Add to dashboard Cite

Invasive hybrids and their spread dynamics pose unique opportunities to study evolutionary processes. Invasive hybrids of native Spartina foliosa and introduced S. alterniflora have expanded throughout San Francisco Bay intertidal habitats within the past 35 years by deliberate plantation and seeds floating on the tide. Our goals were to assess spatial and temporal scales of genetic structure in Spartina hybrid populations within the context of colonization history. We genotyped adult and seedling Spartina using 17 microsatellite loci and mapped their locations in three populations. All sampled seedlings were hybrids. Bayesian ordination analysis distinguished hybrid populations from parent species, clearly separated the population that originated by plantation from populations that originated naturally by seed and aligned most seedlings within each population. Population genetic structure estimated by analysis of molecular variance was substantial (F ST ¼ 0.21). Temporal genetic structure among age classes varied highly between populations. At one population, the divergence between adults and 2004 seedlings was low (F ST ¼ 0.02) whereas at another population this divergence was high (F ST ¼ 0.26). This latter result was consistent with local recruitment of self-fertilized seed produced by only a few parental plants. We found fine-scale spatial genetic structure at distances less than B200 m, further supporting local seed and/ or pollen dispersal. We posit a few self-fertile plants dominating local recruitment created substantial spatial genetic structure despite initial long-distance, human dispersal of hybrid Spartina through San Francisco Bay. Fine-scale genetic structure may more strongly develop when local recruits are dominated by the offspring of a few self-fertile plants.

show abstract