Statistical Methods Applied to a Four-Year Multivariate Study of a Florida Estuarine System

Meeter, DA; Livingston, RJ

doi:10.1520/stp35656s

Cited by 7 publications

(7 citation statements)

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“…The categories 'bivalve mollusks', 'animal remains' (unidentified tissue stained with rose bengal), 'plant remains', 'fish remains', and 'crusta- Nie et al, 1970). Detailed reviews of the use of such techniques were given by Livingston (1975), Livlngston et al (1978), and Meeter and Livingston (1978). All cluster analyses were run using the 'rho' similarity coefficient (Matusita, 1955;van Belle and Ahmad, 1974).…”

Section: Methodsmentioning

confidence: 99%

“…All cluster analyses were run using the 'rho' similarity coefficient (Matusita, 1955;van Belle and Ahmad, 1974). The flexible grouping method with beta = -0.25 (Lance and Williams, 1967) was employed as qualified by Sneath and Sokal (1973) and Meeter and Livingston (1978). Groupings were arbitrarily associated at similarity coefficients exceeding 0.80.…”

Section: Methodsmentioning

confidence: 99%

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Trophic Organization of Fishes in a Coastal Seagrass System

Livingston¹

1982

Mar. Ecol. Prog. Ser.

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149

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A long-term (8-y) field study was made concerning the trophic relationships of fishes that occupy shallow coastal grassbeds in the northeast Gulf of Mexico. Various populatlons migrate into such areas to nursery during portions of their life histories. Many fishes undergo seasonal progressions of food preferences that follow species-specific, ontogenetic patterns. While the extent of such dietary successions varies considerably among the 14 species examined, many populations follow developmental progressions that may encompass various trophic levels from herbivory to carnivory. Omnivores are relatively common in the grassbed areas and there was a range of trophic specialization among the fishes examined. Generalized food preferences were often associated with early growth stages; as they matured, various populations became more specialized in their feeding habits Through treatment of each developmental stage of trophic preference as an individual entity (or 'ontogenetic trophic unit'), it was possible to identify progressions of feeding organization through time. Varying levels of temporal partitioning of food resources were evident. Periodic interspecific overlap of food resources was noted during periods of high productivity. Most grassbed fishes were adapted to extreme seasonal changes in habitat. This adaptation was reflected in observed temporal changes in diet and would explain the difficulty of making direct, linear associations of population distribution with multivariate analyses of specific habitat characteristics. The use of the 'ontogenetic trophic unit' facilitated the examination of the relationships of complex associations of fishes to a h~g h l y variable environment.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Trophic Organization of Fishes in a Coastal Seagrass System

Livingston¹

1982

Mar. Ecol. Prog. Ser.

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149

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“…This index was chosen because of its concentration on the proportion of the total number of individuals represented by each species in the compared populations (or samples). In comparison of collections with large differences in total number of individuals, simi- Meeter and Livingston, 1978).…”

Section: Study Site the Study Site Was Located In Apalacheementioning

confidence: 99%

Distribution of macrobenthic crustaceans associated with Thalassia, Halodule and bare sand substrata

Lewis¹

1984

Mar. Ecol. Prog. Ser.

139

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The influence of macrophyte biomass and species composition on the distribution of macrobenthic crustaceans was examined in 2 vegetated and 2 unvegetated grass bed microhabitats under similar physical-chemical conditions. Vegetated habitats consistently supported higher numbers of individuals and species than either of the unvegetated zones. Correlations between plant biomass in each microhabitat and both animal numbers and diversity suggested that seagrass biomass was a key organizing factor in macrophyte-associated faunal assemblages. The thin-bladed Halodule wrightii supported similar crustacean abundance per core, density and species richness to those found on widebladed Thalassia testudinum, contradicting the predictions of Kikuchi and Peres (1977) that widebladed magnozosterids should have a more abundant and diverse fauna relative to thin-bladed parvozosterids. In addition, after standardization to numbers of individuals per unit plant biomass (or surface area), H. wrightii supported higher abundance than T. testudinum suggesting that seagrass species composition is more important to faunal organization than previously thought. Although similar suites of species inhabited each substratum, relative abundances of individual species were markedly different among the microhabitats. Greatest differences occurred between vegetated and unvegetated zones. Few of the 24 dominant crustaceans (those species with abundances of 1 % or more of the total number of individuals collected) had significantly greater abundances per core on one seagrass species relative to the other. Three species were more abundant on T. testudinum while only 1 occurred in greater numbers on H. wn'ghtii. However, when species abundances per unit plant weight (or surface area) were compared between the 2 vegetation forms, 7 species were significantly more abundant on H. wrightii; only 2 species occurred in higher numbers on T. testudinum. Distribution of crustaceans among seagrass microhabitats appeared to be a complex function involving faunal habitat choice and predation pressure, both of which are affected by the species and biomass of seagrass present.

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“…Several authors have used the stepwise regression analysis in order to correlate the adverse impact of toxic media with physiochemical parameters (Meeter and Livingston 1977;Bomboi et al 1990;Mulliss et al 1996). Several authors have used the stepwise regression analysis in order to correlate the adverse impact of toxic media with physiochemical parameters (Meeter and Livingston 1977;Bomboi et al 1990;Mulliss et al 1996).…”

Section: Resultsmentioning

confidence: 99%