Using Weighted Rankings in the Analysis of Complete Blocks with Additive Block Effects

Quade, Dana

doi:10.1080/01621459.1979.10481670

Cited by 200 publications

(127 citation statements)

References 7 publications

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“…The black arrow indicates the position of the experimental enclosures fixed under the pier in the picture feeding-preference experiments. An analogous of Quade's (1979) statistic test, the Friedman test (Conover 1999) was applied to the data set using the software StatsDirect Version 2.4.5. Linear regression analysis between linear and non-linear parameters (i.e.…”

Section: Discussionmentioning

confidence: 99%

Consumption rates and prey preference of the invasive gastropod Rapana venosa in the Northern Adriatic Sea

Savini

Occhipinti‐Ambrogi

2006

Helgol Mar Res

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The alien Asian gastropod Rapana venosa (Valenciennes 1846) was first recorded in 1973 along the Italian coast of the Northern Adriatic Sea. Recently, this predator of bivalves has been spreading all around the world oceans, probably helped by ship traffic and aquaculture trade. A caging experiment in natural environment was performed during the summer of 2002 in Cesenatico (Emilia-Romagna, Italy) in order to estimate consumption rates and prey preference of R. venosa. The prey items chosen were the Mediterranean mussel Mytilus galloprovincialis (Lamarck 1819), the introduced carpet clam Tapes philippinarum (Adams and Reeve 1850), both supporting the local fisheries, and the Indo-Pacific invasive clam Anadara (Scapharca) inaequivalvis (Bruguie`re 1789). Results showed an average consumption of about 1 bivalve prey per day (or 1.2 g wet weight per day). Predation was species and size selective towards small specimens of A. inaequivalvis; consumption of the two commercial species was lower. These results might reduce the concern about the economical impact on the local bivalve fishery due to the presence of the predatory gastropod. On the other hand, selective predation might probably alter local community structure, influencing competition amongst filter feeder/suspension feeder bivalve species and causing long-term ecological impact. The large availability of food resource and the habitat characteristics of the Emilia-Romagna littoral makes this area an important breeding ground for R. venosa in the Mediterranean Sea, thus worthy of consideration in order to understand the bioinvasion ecology of this species and to control its likely further dispersal.

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Section: Discussionmentioning

confidence: 99%

Consumption rates and prey preference of the invasive gastropod Rapana venosa in the Northern Adriatic Sea

Savini

Occhipinti‐Ambrogi

2006

Helgol Mar Res

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“…We compared signalling responses among treatments in both experiments using the Quade test [46], a non-parametric analogue of a repeated-measures ANOVA. We performed exact Wilcoxon signed-rank tests for post hoc comparisons.…”

Section: Methodsmentioning

confidence: 99%

Negative feedback from maternal signals reduces false alarms by collectively signalling offspring

Hamel

Cocroft

2012

Proc. R. Soc. B.

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Within animal groups, individuals can learn of a predator's approach by attending to the behaviour of others. This use of social information increases an individual's perceptual range, but can also lead to the propagation of false alarms. Error copying is especially likely in species that signal collectively, because the coordination required for collective displays relies heavily on social information. Recent evidence suggests that collective behaviour in animals is, in part, regulated by negative feedback. Negative feedback may reduce false alarms by collectively signalling animals, but this possibility has not yet been tested. We tested the hypothesis that negative feedback increases the accuracy of collective signalling by reducing the production of false alarms. In the treehopper Umbonia crassicornis, clustered offspring produce collective signals during predator attacks, advertising the predator's location to the defending mother. Mothers signal after evicting the predator, and we show that this maternal communication reduces false alarms by offspring. We suggest that maternal signals elevate offspring signalling thresholds. This is, to our knowledge, the first study to show that negative feedback can reduce false alarms by collectively behaving groups.

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“…The Quade test can be used to analyze experiments in which the food choices are not independent, there are no autogenic changes over the duration of the experiment (Peterson & Renaud, 1989;Roa, 1992), and the blocks (trials with individual sea stars) are independent (Quade, 1979;Conover, 1999). Essentially, the Quade test is a two-way ANOVA on ranks (Roa, 1992;Conover, 1999) and a multiple comparison test can be used when significant differences are found (Roa 1992;Conover, 1999).…”

Section: Feeding Preference Of Sea Starsmentioning

confidence: 99%

Effects of sponge and barnacle encrustation on survival of the scallop Chlamys hastata

Farren

Donovan

2007

Hydrobiologia

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The scallop Chlamys hastata frequently carries epibionts such as sponges and barnacles on its shells. Although the scallop-sponge relationship has been characterized as a mutualism, little is known about the scallop-barnacle relationship. This study investigated the effects of sponge and barnacle encrustation on the ability of C. hastata to avoid predation by the sea star Pycnopodia helianthoides. In feeding trials, P. helianthoides caught and consumed significantly more barnacle-encrusted scallops (7.7 ± 0.8 out of 20 scallops) than scallops encrusted by either of the sponges Myxilla incrustans (4.1 ± 0.9) or Mycale adhaerens (3.0 ± 0.5). Epibiont-free scallops (5.7 ± 0.5) formed an intermediate treatment between barnacle-encrusted and sponge-encrusted scallops. Possible mechanisms by which the sponges protected the scallops were investigated in two ways: two feeding trials were videotaped to allow qualitative analysis of sea star and scallop behavior and sea star feeding responses to scallop and sponge homogenates were determined to investigate if sea stars accept scallops and sponges as prey. Sea stars displayed positive feeding responses to scallop puree 97.5% ± 1.6 of the time while only displaying positive responses to Mycale adhaerens homogenate 4.4% ± 2.0 of the time and to Myxilla incrustans homogenate 4.4% ± 2.9 of the time. The videotaped feeding trials indicated that interference with tube feet adhesion by the sponge deterred predation. Observations of both sea stars that were videotaped showed that neither avoided trying to capture sponge-encrusted scallops, and at no time was a captured scallop willingly released by the sea stars. Thus, it appears that sponges provide tactile-mechanical protection and possibly chemical or tactile camouflage in this predator/prey relationship. Finally, the effects of sponge encrustation on barnacle settlement were determined. Field experiments showed that barnacle larvae settled more frequently on epibiont-free scallops than on those with either of the two sponges, potentially protecting the scallops from an epibiont that increases the scallop's susceptibility to predation.

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Using Weighted Rankings in the Analysis of Complete Blocks with Additive Block Effects

Cited by 200 publications

References 7 publications

Consumption rates and prey preference of the invasive gastropod Rapana venosa in the Northern Adriatic Sea

Consumption rates and prey preference of the invasive gastropod Rapana venosa in the Northern Adriatic Sea

Negative feedback from maternal signals reduces false alarms by collectively signalling offspring

Effects of sponge and barnacle encrustation on survival of the scallop Chlamys hastata

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