Ontogenetic Shifts in the Predatory Habits of the Northern Moonsnail (<i>Lunatia heros</i>) on the Northwestern Atlantic Coast

Clements, Jeff C.; Rawlings, Timothy A.

doi:10.2983/035.033.0310

Cited by 14 publications

(15 citation statements)

References 67 publications

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“…When Macoma is scarce, Amauropsis can benefit from the ability to feed on abundant, but apparently less desirable, Hydrobia snails. Prey switching during ontogeny has been reported recently (Clements & Rawlings, 2014) for another naticid species, Lunatia heros (Say, 1822). The ability to diversify food sources is also important for other size-selective predators, especially when primary prey supply is unstable.…”

Section: Discussionmentioning

confidence: 81%

“…In most cases, the larger predators have a broader diet than smaller individuals of the same species (Shine et al , 1998; Olabarria et al , 2009). Predators can switch to a different kind of major prey (Hughes et al , 1992; Clements & Rawlings, 2014) or narrow their diet during ontogeny (Aristov et al , 2003; Moura et al , 2008; Da Rosa et al , 2011). We expect that the change in the population structure of predators (e.g.…”

Section: Introductionmentioning

confidence: 99%

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All's good in a famine?Hydrobia ulvaeas a secondary prey for juveniles of Iceland moonsnailsAmauropsis islandicaat the White Sea sandflats

Aristov

Varfolomeeva

Puzachenko³

2015

J. Mar. Biol. Ass.

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Many size-selective predators switch their diet during ontogeny. At the White Sea, the adult moonsnails Amauropsis islandica feed mostly on Macoma balthica clams. The diet of juveniles was largely unknown. We conducted a field survey and a caging experiment to find out if juvenile moonsnails can prey on Hydrobia ulvae, and whether they prefer this snail to their usual prey. Live molluscs and their intact or perforated shells were collected from 34 sediment cores. We exposed the single-prey cages with 50 Macoma (MP) or 50 Hydrobia (HP) together with five Amauropsis juveniles, as well as the cages where both prey species were in a 25:25 proportion (HMP). While live Hydrobia was more abundant in the natural assemblages, Amauropsis preferred Macoma, as indicated by proportions of perforated shells. The caging experiment produced similar results. Per capita Macoma consumption rate was significantly higher than Hydrobia consumption rate (6.4 ± 0.5 mg day−1 ind.−1vs. 1.4±0.2 mg day−1 ind.−1 in MP and HP respectively). Prey consumption rates in the single-prey treatments were higher than in mixed-prey cages regardless of prey species. Different mechanisms explain this variation: for Hydrobia it is a consequence of the dietary shift, while for Macoma it reflects the ‘floor’ effect in HMP cages, where virtually all Macoma had been drilled by the end of exposure term. While Macoma is the preferable prey of young Amauropsis, Hydrobia can supplement the diet of juveniles when Macoma is scarce in certain locations.

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Section: Discussionmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

All's good in a famine?Hydrobia ulvaeas a secondary prey for juveniles of Iceland moonsnailsAmauropsis islandicaat the White Sea sandflats

Aristov

Varfolomeeva

Puzachenko³

2015

J. Mar. Biol. Ass.

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“…During our survey we found that in 2014 the dominant part of registered mortality in Macoma population was due to predation by Amauropsis (Aristov et al , 2015). Along with the well-known high consumption rate in other naticid species (Clements & Rawlings, 2014) we can expect that abundance of A. islandica snails has an impact on long-term Macoma population dynamics.…”

Section: Introductionmentioning

confidence: 90%

Trends and drivers of Macoma balthica L. dynamics in Kandalaksha Bay, the White Sea

Genelt-Yanovskiy

Aristov

Poloskin³

et al. 2017

J. Mar. Biol. Ass.

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Long-term population dynamics of marine invertebrates can be shaped by environmental conditions as well as biotic factors, including predation, diseases, interspecific or intraspecific competition. Towards the northern edge of species ranges the role of biotic interactions gradually decreases while the impact of climate oscillations becomes more important. This study examined the long-term changes in abundance, individual growth rates and shell shape characteristics of Macoma balthica, one of the dominant species in White Sea soft-bottom intertidal communities. To test the role of predators in changes in clam abundance, we examined the number of moonsnails Amauropsis islandica. Macoma balthica exhibited spatially synchronous population dynamics at six sites in Kandalaksha Bay, where densities of clams varied between 140 and 8500 ind. m−2 during the 21-year period of observations. Statistical modelling using generalized additive models (GAM) shows that a combination of mild winter and warm summer led to an increase in M. balthica density the following year. Predation by A. islandica had no impact on changes in M. balthica density. Growth rates of M. balthica were higher during a cool decade, but clams that lived in a warmer period were characterized by more globose shells. Our results suggest that the climate oscillations can be regarded as the key factor causing the shift in abundance of M. balthica in the White Sea during the last two decades via recruitment and survival.

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“…Кроме того, на различных этапах жизни и в зависимости от наличия доступных трофических ресурсов моллюски могут переключаться на разные источники пищи, что также отражается на изотопных подписях. Так для некоторых моллюсков показано, что по мере увеличения размера тела они изменяют свои пищевые предпочтения в пользу более крупной добычи (Clements and Rawlings 2014). Кратковременное онтогенетическое снижение δ13С может быть также приурочено к периодам высокой репродуктивной активности моллюсков (Lartaud et al 2010).…”

Section: результаты и их обсуждениеunclassified

Стабильные изотопы углерода и азота в органическом матриксе раковин чужеродных моллюсков Viviparus viviparus (Linnaeus, 1758) Новосибирского водохранилища

Yanygina¹,

Volgina²

2019

abs

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Анализ стабильных изотопов углерода и азота широко используется в экологических исследованиях для изучения структуры трофических сетей, оценки роли различных ресурсов в питании отдельных особей, определении трофического уровня консументов. Раковина у моллюсков постепенно формируется в течение всей жизни и отражает особенности питания особей в разном возрасте. Проведены исследования стабильных изотопов углерода и азота раковин чужеродных моллюсков Viviparus viviparus (Linnaeus, 1758), собранных в Новосибирском водохранилище. Отмечены статистически значимые различия изотопного состава фрагментов раковин, соответствующих годичному приросту разных лет. Высказано предположение о значимой роли межгодовых различий трофических условий в водохранилище в формировании изотопной подписи раковин моллюсков. Результаты работы могут быть использованы в экологических и палеолимнологических исследованиях питания моллюсков, при реконструкции долговременных изменений экологических условий водоемов.

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Ontogenetic Shifts in the Predatory Habits of the Northern Moonsnail (Lunatia heros) on the Northwestern Atlantic Coast

Cited by 14 publications

References 67 publications

All's good in a famine?Hydrobia ulvaeas a secondary prey for juveniles of Iceland moonsnailsAmauropsis islandicaat the White Sea sandflats

All's good in a famine?Hydrobia ulvaeas a secondary prey for juveniles of Iceland moonsnailsAmauropsis islandicaat the White Sea sandflats

Trends and drivers of Macoma balthica L. dynamics in Kandalaksha Bay, the White Sea

Стабильные изотопы углерода и азота в органическом матриксе раковин чужеродных моллюсков Viviparus viviparus (Linnaeus, 1758) Новосибирского водохранилища

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