Efficient analysis of split-plot experimental designs using model averaging

Hong, Chuen Yen; Fletcher, David; Zeng, Jiaxu; McGraw, Christina M.; Cornwall, Christopher E.; Cummings, Vonda J.; Barr, Neill; Frost, Emily J.; Dillingham, Peter W.

doi:10.1080/00224065.2022.2147108

Cited by 1 publication

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References 86 publications

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“…Our experiment was set up following a split-plot design that was replicated in time (one trial per week for 6 weeks; Figure 1). Split-plot designs are commonly used in laboratory-based marine experiments with more than one factor due to the ability to manipulate different factors at different scales, yielding two levels of replication (whole-plot and subplot replicates; Hong et al, 2023). Each week, we set up three 65-L header tanks (55 × 45 × 26 cm) supplied by flow-through seawater at a rate of 100 mL/s (tank residence time: 11 min).…”

Section: Experiments Detailsmentioning

confidence: 99%

Size‐specific reduction in kelp consumption by New Zealand urchins exposed to chemical cues from the red rock lobster

Curtis,

Wing

2024

Ecosphere

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Sea urchins can strongly reduce their mobility, exposure to predation, and feeding rates upon detection of chemical cues produced by predators, driving behavioral effects on grazing activity that may contribute to macroalgal community dynamics. However, the extent of chemically induced antipredator behaviors in urchins can vary by predator–prey species pair and ecological context and is therefore important to characterize in novel settings. Additionally, the effect of predator and prey size on urchin reactions to predator cues has rarely been considered, with the few existing examples yielding mixed conclusions. Here, we used a replicated split‐plot experiment to measure the effects of red rock lobsters (Jasus edwardsii) on consumption of macroalgae by the New Zealand sea urchin (Evechinus chloroticus) across a range of predator and prey body sizes. Overall, per‐capita consumption rates of kelp by urchins declined by 30% in the presence of lobsters, though feeding activity varied widely among individuals. Based on mass‐specific measurements of feeding rates, responses to predator cues appeared similar across all urchin sizes but only yielded distinguishable differences in the amount of kelp consumed in trials with larger urchins due to their considerably higher feeding capacity. Conversely, consumption rates of kelp by urchins had no apparent relationship with lobster size, likely due to chemical cue saturation in our experimental setting or a risk gradient that was insufficient to elicit a graded behavioral response. Our findings provide new evidence for a nonconsumptive effect of lobsters on feeding rates of an important grazer that can potentially reinforce the ecological role of this key predator in New Zealand kelp beds.

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Section: Experiments Detailsmentioning

confidence: 99%