Asymmetric interference competition between herbivorous gastropods, introduced Littorina littorea and indigenous L. obtusata

Putnam, Alysha B.; Peckol, P.

doi:10.3354/meps12523

Cited by 8 publications

(3 citation statements)

References 87 publications

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“…obs.). In lab experiments the presence of an invasive marine snail (Littorina littorea) as well as exposure to their waterborne cues reduced herbivory by the native snail (L. obtusa; Putnam and Peckol 2018). However, the growth inhibition observed in our experiments cannot be interpreted as a feeding inhibition because feeding rates were similar across treatments at day six of the lab chamber experiment when snails were similar sizes.…”

Section: Discussionmentioning

confidence: 57%

“…There is a lack of investigation of chemical growth inhibition among animals in the literature and most studies investigating chemical inhibition are older and focused on intraspecific interactions and crowded conditions (e.g., Berrie andVisser 1963, Thomas et al 1975). More recently, lab experiments with the non-native marine gastropod Littorina littorea found lower grazing rates of a native gastropod (L. obtusata; Putnam and Peckol 2018) in response to waterborne cues, which is a kind of interference competition. In our study feeding rates were unaffected by P. maculata cues.…”

Section: Discussionmentioning

confidence: 99%

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Direct chemical inhibition responsible for displacement of a native herbivore by an invasive congener

Drumheller

Cook

Dorn

2021

Preprint

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The mechanisms causing native displacement by invasive species are challenging to identify. We used survey data to demonstrate a local extinction of a native gastropod ( Pomacea paludosa ) from a Florida wetland coincident with invasion of a non-native gastropod ( P. maculata ). We then examined the potential for P. maculata to displace P. paludosa . We used two field experiments to examine effects of densities and heterospecific interactions on juvenile growth in situ and we used lab and mesocosm experiments to explore chemically-mediated interactions between the species. Field experiments produced variable results; evidence for reduced P. paludosa growth in the presence of P. maculata was found under higher nutrient conditions with fast snail growth rates, but growth inhibition disappeared under oligotrophic conditions. Resource reduction could not be demonstrated in the field. Juvenile P. paludosa did not avoid mucus of P. maculata and did not reduce feeding in response to cues. Nevertheless, exposure to mucus and waterborne cues of P. maculata reduced P. paludosa growth by 53% relative to conspecific cue exposure. In mesocosms juvenile P. paludosa growth was significantly negatively correlated with adult P. maculata waterborne cues and was particularly affected at exposures ≥60% (~0.6 · m -2 ). Combined mucus and waterborne cues appeared to further reduce growth at low exposure (20%). We documented the first apparent local extinction of P. paludosa by P. maculata. We found no evidence for competition, but the results collectively pointed to direct chemical inhibition of growth that could be important at field scales, even at low densities.

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Section: Discussionmentioning

confidence: 57%

Section: Discussionmentioning

confidence: 99%

Direct chemical inhibition responsible for displacement of a native herbivore by an invasive congener

Drumheller

Cook

Dorn

2021

Preprint

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“…A study conducted by Putnam & Peckol (2018) found that larger snails, L. littorea were able to outcompete smaller L. obtusata for algae, who suffered reduced growth rates and an altered distribution.…”

Section: Mobile Organismsmentioning

confidence: 99%

Behavioural Competition in the Intertidal Shore Crab, Petrolisthes elongatus

Yeoh¹

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<p>Competition is a well-documented ecological interaction that underpins community structures and much of population ecology. Physical characteristics such as size, age, sex and weaponry all have an important part to play in how an organism competes, and for many animals, competition is mediated by behavioural patterns. Outcomes of these competitive interactions are not only driven by these characteristics, but by the environmental conditions and external pressures that influence them. The focal species of my study is Petrolisthes elongatus (H. Milne Edwards, 1837), a porcellanid crab that aggregates in high densities among cobblestone beaches along the intertidal shores of New Zealand and Tasmania. They utilize rocks and crevices as shelter spaces to protect themselves from environmental and predation pressures, displaying variation in physical characteristics, such as sexual dimorphism and autotomy, as well as high levels of behavioural complexity. I used laboratory experiments with crabs collected from the field and placed them in shelter-limited tanks under the following comparisons; 1) adult and juvenile males, 2) males and females, 3) ovigerous and non-ovigerous females, and 4) autotomized and non-autotomized males. For each of these experiments I used three different environmental conditions; 1) a control high tide, 2) a low tide treatment (where water was drained from the experimental tank), and 3) with the presence of a predator, a juvenile spiny rock lobster (Jasus edwarsii). Each experiment was recorded for 8 hours, where time spent under shelter and shoving interactions among individuals were counted. In the adult vs. juvenile and male vs. female experiments, smaller individuals spent a significantly more time under shelter than larger conspecifics, but increasing size resulted in more time spent under shelter in the autotomized vs. non-autotomized experiment. In all experiments, smaller individuals initiated the least amount of competitive interactions, and each size class was more likely to displace a smaller individual from a shelter, than a larger one. There was no significant difference in the time spent under shelter between males and females, but ovigerous females and autotomized males spent significantly more time under shelter than their respective competitors. Males also engaged in more shoving interactions than females, with smaller classes of males displacing larger classes of females from shelter spaces. Ovigerous females also outcompeted non-ovigerous conspecifics in the large majority of competitive interactions, and autotomized individuals engaged in significantly more contests than non-autotomized conspecifics. In all experiments, the presence of a predator had no effect on the number of shoving interactions and only resulted in an increase in time spent under shelter for individuals in the male vs. female and ovigerous vs. non-ovigerous experiments. A field survey on body to cheliped size ratios, autotomy and claw punctures counts was also conducted in support of the shelter-competition experiments. Crabs were collected over a one-month period in November 2018, brought back to the lab to be sexed, measured (Carapace Width, BW; and Cheliped Length, CL) and then surveyed for autotomy and claw puncture wounds. Juveniles of both sex (BW =</p>

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The role of direct chemical inhibition in the displacement of a native herbivore by an invasive congener

2022

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Asymmetric interference competition between herbivorous gastropods, introduced Littorina littorea and indigenous L. obtusata

Cited by 8 publications

References 87 publications

Direct chemical inhibition responsible for displacement of a native herbivore by an invasive congener

Direct chemical inhibition responsible for displacement of a native herbivore by an invasive congener

Behavioural Competition in the Intertidal Shore Crab, Petrolisthes elongatus

The role of direct chemical inhibition in the displacement of a native herbivore by an invasive congener

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