Geographic information systems (GIS) and remote sensing in aquatic botany: methodological aspects

Caloz, Régis; Collet, Claude

doi:10.1016/s0304-3770(97)00036-3

Cited by 15 publications

(7 citation statements)

References 4 publications

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“…This provided a means for standardising comparison of photographs among different dates. Between 5 and 10 control points per location were identified for georeferencing areas in photographs from different dates (Caloz & Collet 1997) and recorded in the field during 2001 and 2002 using geographical positioning systems (GPS). Areas of fucoid canopy in photographs contrast sharply with the barnacle cover that dominates in the absence of macroalgae.…”

Section: Methodsmentioning

confidence: 99%

Limpet grazing and loss of Ascophyllum nodosum canopies on decadal time scales

Davies¹,

Johnson²,

Maggs³

2007

Mar. Ecol. Prog. Ser.

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Section: Methodsmentioning

confidence: 99%

Limpet grazing and loss of Ascophyllum nodosum canopies on decadal time scales

Davies¹,

Johnson²,

Maggs³

2007

Mar. Ecol. Prog. Ser.

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“…Three divers were involved with the surveys, and prior to each survey a calibration dive was carried out. To visualize the spatial distribution patterns of Sargassum within the bed, maps of cover values were plotted for each month using an inverse distance interpolation technique (nearest neighbor and exponent 2) (Caloz 1997). Within the Sargassum bed, line-transects were added to quantify the continuous distribution of Sargassum and encrusting algae, a group that was abundant but inconspicuous and often partly buried.…”

Section: Distribution From the Beachmentioning

confidence: 99%

Spatio-temporal distribution patterns of the invasive macroalga Sargassum muticum within a Danish Sargassum-bed

et al. 2005

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Sargassum muticum was first observed in Scandinavia in Limfjorden (Denmark) in 1984, where it is now the most abundant and conspicuous macroalga. Despite the ecological importance of Sargassum, few studies have described seasonal patterns within Scandinavian Sargassum beds. We quantified the dynamics of macroalgae among years and seasons along a depth transect through a typical Sargassum bed in Limfjorden. The annual investigations (summer transects 1989–1999) showed a gradual increase in the dominance of Sargassum, especially at the 2–4-m depth interval. Significant seasonal dynamics in macroalgal abundance and assemblage structure were observed in this depth interval; the mean cover of Sargassum varied from ca. 5% (autumn and winter) to 25% (mid-summer). In comparison, encrusting algae had high and relatively stable covers throughout the year (ca. 20%). Other perennial macroalgae had low mean covers (\u3c2%) characterized by a few patches of higher abundances. Except from a spring bloom, filamentous algae had low covers throughout the year. Within this relatively uniform bed, Sargassum abundance was positively related to boulders \u3e10 cm in diameter and species richness was negatively correlated to depth and stones \u3c10 cm in diameter, and non-correlated to other algal form-groups or grazer densities. Thus, in Limfjorden, the distribution of Sargassum is determined by large- (\u3e6 m) and small-scale (\u3c1 m) depth differences where low light limits Sargassum at depth, physical disturbance and sediment stress limits Sargasum in shallow waters, and the presence of stable boulder substratum facilitate Sargassum. Competition for space from other macroalgae and herbivory are probably of minor importance

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“…Our program does not currently use this method. However, since it is a method that tends to spark a lot of interest I have included a few references to recent papers (Marshall and Lee 1994, Kress and Morgan 1995, Caloz and Collet 1997, Muller 1997, Everitt et al 1999.…”

Section: Remote Sensingmentioning

confidence: 99%

Physical Control of Nonindigenous Aquatic Plants in Emerald Bay, Lake Tahoe, CA

Shaw

Hymanson

Sasaki

2016

Invasive plant sci. manag.

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Establishment of nonindigenous (NI) aquatic plants in the nearshore regions of freshwater ecosystems has resulted in environmental degradation, recreation concerns, economic impacts, and substantial management challenges. To reduce these undesirable effects, NI aquatic plants are often targeted for removal or control by management agencies, but the efficacy of implementation is often not documented or sustained. In this study, we developed a management plan to completely remove all NI plants from Emerald Bay, Lake Tahoe, CA, using only physical control techniques. Management plan priorities were based on previous research and lessons learned, including the need for (1) integrated weed management using multiple physical control techniques, (2) a large initial treatment investment, (3) ongoing early detection and rapid response, (4) detailed ecological monitoring, and (5) a long-term commitment to annual maintenance removal. Application of this management plan resulted in complete removal of all NI aquatic plants from Emerald Bay and substantial cost savings each year after the initial large investment. Annual maintenance removal and monitoring will need to continue as long as NI aquatic plants continue to enter Emerald Bay on boats and currents from other areas of Lake Tahoe.

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Geographic information systems (GIS) and remote sensing in aquatic botany: methodological aspects

Cited by 15 publications

References 4 publications

Limpet grazing and loss of Ascophyllum nodosum canopies on decadal time scales

Limpet grazing and loss of Ascophyllum nodosum canopies on decadal time scales

Spatio-temporal distribution patterns of the invasive macroalga Sargassum muticum within a Danish Sargassum-bed

Physical Control of Nonindigenous Aquatic Plants in Emerald Bay, Lake Tahoe, CA

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