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Karen J Mcglathery - One of the best experts on this subject based on the ideXlab platform.
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Spatial variation in recruitment of native and invasive Sessile Species onto oyster reefs in a temperate soft-bottom lagoon
Estuarine Coastal and Shelf Science, 2020Co-Authors: Mads S Thomsen, Brian R Silliman, Karen J McglatheryAbstract:Although spatial variability in recruitment is a strong force structuring many marine communities, relatively few data exist on recruitment variability in Sessile oyster reef communities. In a soft-bottom lagoon in Virginia, we tested if recruitment differed among three reefs situated across a mainland-lagoon-barrier-island transect and among elevations (\u3e90–80, \u3e80–70, \u3e70–55 and \u3e55–20 cm below MSL) on the lagoon reef. The most abundant taxa (the invasive algae Gracilaria vermiculophylla and Codium fragile and the indigenous oyster Crassostrea virginica and algae Ulva curvata) had highest recruitment at the lagoon reef, where propagule supply was likely highest. The mainland reef had lowest algal richness (1.4–3.1 panel−1) and abundances (\u3c4% cover) compared to lagoon and island reefs (3.3–6.5 panel−1, 14–20%), but there were no differences between sites for animals. Overall, animals and algae were equally dominant at the mainland reef, whereas algae dominated at lagoon and island reefs. High water turbidity and suspended solids are typical algal stressors at mainland reefs, and these may account for the low algal abundance in that region. For many Species (at least 9 out of 14) differences in recruitment success were observed over elevation differences as small as 10–30 cm, e.g. G. vermiculophylla and C. fragile mainly recruited up to \u3e70–55 and \u3e80–70 cm respectively (probably limited upward by desiccation), U. curvata down to \u3e70–55 cm (probably limited downward by grazing or competition), whereas C. virginica recruited at all elevations. Animal richness was highest at the two lowest elevations (2.0–2.5 vs. 1.1–1.8 panel−1), but there was no effect of elevation on algae (3–6 panel−1) because of Species substitutions between elevation levels. Thus, as in rocky intertidal systems, spatial variability in recruitment is important for community structure on oyster reefs, and if biodiversity is considered an important reef conservation goal, managers should focus conservation and restoration on locations and elevations that support successful recruitment and survival of many different Species
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spatial variation in recruitment of native and invasive Sessile Species onto oyster reefs in a temperate soft bottom lagoon
Estuarine Coastal and Shelf Science, 2007Co-Authors: Mads S Thomsen, Brian R Silliman, Karen J McglatheryAbstract:Abstract Although spatial variability in recruitment is a strong force structuring many marine communities, relatively few data exist on recruitment variability in Sessile oyster reef communities. In a soft-bottom lagoon in Virginia, we tested if recruitment differed among three reefs situated across a mainland-lagoon-barrier-island transect and among elevations (>90–80, >80–70, >70–55 and >55–20 cm below MSL) on the lagoon reef. The most abundant taxa (the invasive algae Gracilaria vermiculophylla and Codium fragile and the indigenous oyster Crassostrea virginica and algae Ulva curvata ) had highest recruitment at the lagoon reef, where propagule supply was likely highest. The mainland reef had lowest algal richness (1.4–3.1 panel −1 ) and abundances ( −1 , 14–20%), but there were no differences between sites for animals. Overall, animals and algae were equally dominant at the mainland reef, whereas algae dominated at lagoon and island reefs. High water turbidity and suspended solids are typical algal stressors at mainland reefs, and these may account for the low algal abundance in that region. For many Species (at least 9 out of 14) differences in recruitment success were observed over elevation differences as small as 10–30 cm, e.g. G. vermiculophylla and C. fragile mainly recruited up to >70–55 and >80–70 cm respectively (probably limited upward by desiccation), U. curvata down to >70–55 cm (probably limited downward by grazing or competition), whereas C. virginica recruited at all elevations. Animal richness was highest at the two lowest elevations (2.0–2.5 vs. 1.1–1.8 panel −1 ), but there was no effect of elevation on algae (3–6 panel −1 ) because of Species substitutions between elevation levels. Thus, as in rocky intertidal systems, spatial variability in recruitment is important for community structure on oyster reefs, and if biodiversity is considered an important reef conservation goal, managers should focus conservation and restoration on locations and elevations that support successful recruitment and survival of many different Species.
Sandra Knapp - One of the best experts on this subject based on the ideXlab platform.
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a cladistic analysis of the solanum Sessile Species group section geminata pro parte solanaceae
Botanical Journal of the Linnean Society, 1991Co-Authors: Sandra KnappAbstract:The Solanum Sessile Species group is one of eight putatively monophyletic subgroups of the large and diverse Solanum section Geminata. The Species group comprises ten Species of mostly northern South American trees and shrubs. Characters and character states peculiar to Solanum are discussed in detail. A cladistic analysis of the Sessile group yielded four equally parsimonious trees which represent two basic tree topologies. The consensus cladogram is composed of three main clades. Biogeographic analysis using the consensus tree revealed no components in common to the three clades. Possible geographical scenarios are discussed with reference to the geological history of northern South America.
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a revision of the solanum Sessile Species group section geminata pro parte solanaceae
Botanical Journal of the Linnean Society, 1991Co-Authors: Sandra KnappAbstract:KNAPP, S., 1991. A revision of theSolatium SessileSpecies (sectioGeminata pro parte: Solanaceae). The taxonomy of the Solanum Sessile Species group (a part of the large and unwieldy section Geminata) is reviewed, based on detailed field and herbarium studies. Members of the group are found from Mexico to Bolivia in a variety of habitats. Ten Species are recognized: S. obovalifolium, S. Sessile, S. monadelphum, S. turgidum, S. triste, S. chlamydogynum, S. rovirosanum, S. palmillae, S. oppositifolium and conferliseriatum.
Mads S Thomsen - One of the best experts on this subject based on the ideXlab platform.
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Spatial variation in recruitment of native and invasive Sessile Species onto oyster reefs in a temperate soft-bottom lagoon
Estuarine Coastal and Shelf Science, 2020Co-Authors: Mads S Thomsen, Brian R Silliman, Karen J McglatheryAbstract:Although spatial variability in recruitment is a strong force structuring many marine communities, relatively few data exist on recruitment variability in Sessile oyster reef communities. In a soft-bottom lagoon in Virginia, we tested if recruitment differed among three reefs situated across a mainland-lagoon-barrier-island transect and among elevations (\u3e90–80, \u3e80–70, \u3e70–55 and \u3e55–20 cm below MSL) on the lagoon reef. The most abundant taxa (the invasive algae Gracilaria vermiculophylla and Codium fragile and the indigenous oyster Crassostrea virginica and algae Ulva curvata) had highest recruitment at the lagoon reef, where propagule supply was likely highest. The mainland reef had lowest algal richness (1.4–3.1 panel−1) and abundances (\u3c4% cover) compared to lagoon and island reefs (3.3–6.5 panel−1, 14–20%), but there were no differences between sites for animals. Overall, animals and algae were equally dominant at the mainland reef, whereas algae dominated at lagoon and island reefs. High water turbidity and suspended solids are typical algal stressors at mainland reefs, and these may account for the low algal abundance in that region. For many Species (at least 9 out of 14) differences in recruitment success were observed over elevation differences as small as 10–30 cm, e.g. G. vermiculophylla and C. fragile mainly recruited up to \u3e70–55 and \u3e80–70 cm respectively (probably limited upward by desiccation), U. curvata down to \u3e70–55 cm (probably limited downward by grazing or competition), whereas C. virginica recruited at all elevations. Animal richness was highest at the two lowest elevations (2.0–2.5 vs. 1.1–1.8 panel−1), but there was no effect of elevation on algae (3–6 panel−1) because of Species substitutions between elevation levels. Thus, as in rocky intertidal systems, spatial variability in recruitment is important for community structure on oyster reefs, and if biodiversity is considered an important reef conservation goal, managers should focus conservation and restoration on locations and elevations that support successful recruitment and survival of many different Species
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spatial variation in recruitment of native and invasive Sessile Species onto oyster reefs in a temperate soft bottom lagoon
Estuarine Coastal and Shelf Science, 2007Co-Authors: Mads S Thomsen, Brian R Silliman, Karen J McglatheryAbstract:Abstract Although spatial variability in recruitment is a strong force structuring many marine communities, relatively few data exist on recruitment variability in Sessile oyster reef communities. In a soft-bottom lagoon in Virginia, we tested if recruitment differed among three reefs situated across a mainland-lagoon-barrier-island transect and among elevations (>90–80, >80–70, >70–55 and >55–20 cm below MSL) on the lagoon reef. The most abundant taxa (the invasive algae Gracilaria vermiculophylla and Codium fragile and the indigenous oyster Crassostrea virginica and algae Ulva curvata ) had highest recruitment at the lagoon reef, where propagule supply was likely highest. The mainland reef had lowest algal richness (1.4–3.1 panel −1 ) and abundances ( −1 , 14–20%), but there were no differences between sites for animals. Overall, animals and algae were equally dominant at the mainland reef, whereas algae dominated at lagoon and island reefs. High water turbidity and suspended solids are typical algal stressors at mainland reefs, and these may account for the low algal abundance in that region. For many Species (at least 9 out of 14) differences in recruitment success were observed over elevation differences as small as 10–30 cm, e.g. G. vermiculophylla and C. fragile mainly recruited up to >70–55 and >80–70 cm respectively (probably limited upward by desiccation), U. curvata down to >70–55 cm (probably limited downward by grazing or competition), whereas C. virginica recruited at all elevations. Animal richness was highest at the two lowest elevations (2.0–2.5 vs. 1.1–1.8 panel −1 ), but there was no effect of elevation on algae (3–6 panel −1 ) because of Species substitutions between elevation levels. Thus, as in rocky intertidal systems, spatial variability in recruitment is important for community structure on oyster reefs, and if biodiversity is considered an important reef conservation goal, managers should focus conservation and restoration on locations and elevations that support successful recruitment and survival of many different Species.
Juan Carlos Castilla - One of the best experts on this subject based on the ideXlab platform.
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THE “IDIOSYNCRATIC” EFFECT OF A “SENTINEL” Species ON CONTAMINATED ROCKY INTERTIDAL COMMUNITIES
Ecological Applications, 2003Co-Authors: J Farina, Juan Carlos Castilla, F. P. OjedaAbstract:Depending on their biological characteristics, some Species can exert strong (idiosyncratic) effects on ecosystem process. Human impacts on biological communities are related to biodiversity declines but also with Species shifts and replacements. In northern Chile, the occurrence of copper mine tailings in seawater is associated with a decrease in the number of Sessile Species and with rocky intertidal substrate monopolization by one sentinel Species, the green ephemeral-opportunistic algae Entermorpha compressa. In spite of these changes, several consumer Species persist on the contaminated sites. In this study, we test the hypothesis that changes in benthic Species dominance and composition is associated with an increase in productivity, which affects intertidal consumer abundance, biomass, and/or diversity. We compare benthic Species richness, composition, and productivity as well as the abundance, diversity, and diet of consumer Species on contaminated and noncontaminated sites. Our results show that ...
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temporal variation in the diversity and cover of Sessile Species in rocky intertidal communities affected by copper mine tailings in northern chile
Marine Pollution Bulletin, 2001Co-Authors: J Farina, Juan Carlos CastillaAbstract:Several coastal rocky shores in the northern Chile have been affected by the discharges of copper mine tailings. In spite of this, the temporal and spatial variation on the diversity and composition of their intertidal benthic communities has scarcely been studied. The objectives of the present study were to analyse and to compare quantitatively the temporal variation on the diversity, cover and composition of Sessile Species in rocky intertidal benthic communities of the northern Chilean coast, in relation to the presence of copper mine tailings. The results show that the drastic reduction on the Sessile Species diversity and the monopolization of the substrate exerted by the green algae Enteromorpha compressa, are common and permanent features of the intertidal rocky shores affected by copper mine tailings. Such spatial (between sites) and temporal (seasonal) variation of these changes has been associated with the relative concentrations of trace metals and inorganic particles of the mining wastes. Our results suggest that the mechanical effects of resuspended and settling tailings are a more likely cause.
Brian R Silliman - One of the best experts on this subject based on the ideXlab platform.
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Spatial variation in recruitment of native and invasive Sessile Species onto oyster reefs in a temperate soft-bottom lagoon
Estuarine Coastal and Shelf Science, 2020Co-Authors: Mads S Thomsen, Brian R Silliman, Karen J McglatheryAbstract:Although spatial variability in recruitment is a strong force structuring many marine communities, relatively few data exist on recruitment variability in Sessile oyster reef communities. In a soft-bottom lagoon in Virginia, we tested if recruitment differed among three reefs situated across a mainland-lagoon-barrier-island transect and among elevations (\u3e90–80, \u3e80–70, \u3e70–55 and \u3e55–20 cm below MSL) on the lagoon reef. The most abundant taxa (the invasive algae Gracilaria vermiculophylla and Codium fragile and the indigenous oyster Crassostrea virginica and algae Ulva curvata) had highest recruitment at the lagoon reef, where propagule supply was likely highest. The mainland reef had lowest algal richness (1.4–3.1 panel−1) and abundances (\u3c4% cover) compared to lagoon and island reefs (3.3–6.5 panel−1, 14–20%), but there were no differences between sites for animals. Overall, animals and algae were equally dominant at the mainland reef, whereas algae dominated at lagoon and island reefs. High water turbidity and suspended solids are typical algal stressors at mainland reefs, and these may account for the low algal abundance in that region. For many Species (at least 9 out of 14) differences in recruitment success were observed over elevation differences as small as 10–30 cm, e.g. G. vermiculophylla and C. fragile mainly recruited up to \u3e70–55 and \u3e80–70 cm respectively (probably limited upward by desiccation), U. curvata down to \u3e70–55 cm (probably limited downward by grazing or competition), whereas C. virginica recruited at all elevations. Animal richness was highest at the two lowest elevations (2.0–2.5 vs. 1.1–1.8 panel−1), but there was no effect of elevation on algae (3–6 panel−1) because of Species substitutions between elevation levels. Thus, as in rocky intertidal systems, spatial variability in recruitment is important for community structure on oyster reefs, and if biodiversity is considered an important reef conservation goal, managers should focus conservation and restoration on locations and elevations that support successful recruitment and survival of many different Species
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spatial variation in recruitment of native and invasive Sessile Species onto oyster reefs in a temperate soft bottom lagoon
Estuarine Coastal and Shelf Science, 2007Co-Authors: Mads S Thomsen, Brian R Silliman, Karen J McglatheryAbstract:Abstract Although spatial variability in recruitment is a strong force structuring many marine communities, relatively few data exist on recruitment variability in Sessile oyster reef communities. In a soft-bottom lagoon in Virginia, we tested if recruitment differed among three reefs situated across a mainland-lagoon-barrier-island transect and among elevations (>90–80, >80–70, >70–55 and >55–20 cm below MSL) on the lagoon reef. The most abundant taxa (the invasive algae Gracilaria vermiculophylla and Codium fragile and the indigenous oyster Crassostrea virginica and algae Ulva curvata ) had highest recruitment at the lagoon reef, where propagule supply was likely highest. The mainland reef had lowest algal richness (1.4–3.1 panel −1 ) and abundances ( −1 , 14–20%), but there were no differences between sites for animals. Overall, animals and algae were equally dominant at the mainland reef, whereas algae dominated at lagoon and island reefs. High water turbidity and suspended solids are typical algal stressors at mainland reefs, and these may account for the low algal abundance in that region. For many Species (at least 9 out of 14) differences in recruitment success were observed over elevation differences as small as 10–30 cm, e.g. G. vermiculophylla and C. fragile mainly recruited up to >70–55 and >80–70 cm respectively (probably limited upward by desiccation), U. curvata down to >70–55 cm (probably limited downward by grazing or competition), whereas C. virginica recruited at all elevations. Animal richness was highest at the two lowest elevations (2.0–2.5 vs. 1.1–1.8 panel −1 ), but there was no effect of elevation on algae (3–6 panel −1 ) because of Species substitutions between elevation levels. Thus, as in rocky intertidal systems, spatial variability in recruitment is important for community structure on oyster reefs, and if biodiversity is considered an important reef conservation goal, managers should focus conservation and restoration on locations and elevations that support successful recruitment and survival of many different Species.