Design and analysis of multiple choice feeding preference data

Prince, Jeffrey S.; LeBlanc, William G.; Maciá, Silvia

doi:10.1007/s00442-003-1413-2

Cited by 51 publications

(30 citation statements)

References 11 publications

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“…a total of 30 prey individuals and one predator per aquaria). Control treatments were stocked with the same prey density but without predators to provide a baseline of prey survival and behavior in predator's absence (Prince et al, 2004). Fish density used in the treatments mimicked natural densities of juvenile fish in the lagoons and littoral areas of the Paraná River (Pelicice et al, 2005;Bulla, 2011).…”

Section: Methodsmentioning

confidence: 99%

Experimental assessment of the effects of a Neotropical nocturnal piscivore on juvenile native and invasive fishes

et al. 2012

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We experimentally examined the predator-prey relationships between juvenile spotted sorubim Pseudoplastystoma corruscans and young-of-the-year invasive and native fish species of the Paraná River basin, Brazil. Three invasive (peacock bass Cichla piquiti, Nile tilapia Oreochromis niloticus, and channel catfish Ictalurus punctatus) and two native (yellowtail tetra Astyanax altiparanae and streaked prochilod Prochilodus lineatus) fish species were offered as prey to P. corruscans in 300 L aquaria with three habitat complexity treatments (0%, 50% and 100% structure-covered). Prey survival was variable through time and among species (C. piquiti < O. niloticus < A. altiparanae < P. lineatus < I. punctatus), depending largely on species-specific prey behavior but also on prey size and morphological defenses. Habitat complexity did not directly affect P. corruscans piscivory but some prey species changed their microhabitat use and shoaling behavior among habitat treatments in predator's presence. Pseudoplatystoma corruscans preyed preferentially on smaller individuals of those invasive species with weak morphological defensive features that persisted in a non-shoaling behavior. Overall, our results contrast with those in a companion experiment using a diurnal predator, suggesting that nocturnal piscivores preferentially prey on different (rather diurnal) fish species and are less affected by habitat complexity. Our findings suggest that recovering the native populations of P. corruscans might help controling some fish species introduced to the Paraná River basin, particularly C. piquiti and O. niloticus, whose parental care is expected to be weak or null at night.A relação predador-presa entre juvenis de pintado Pseudoplatystoma corruscans (piscívoro nativo) e jovens do ano de espécies nativas e invasoras de peixes da bacia do rio Paraná, Brasil, foi testada experimentalmente. Três espécies de peixe invasoras (o tucunaré Cichla piquiti, a tilápia do Nilo Oreochromis niloticus e o bagre do canal Ictalurus punctatus) e duas nativas (o lambari do rabo amarelo Astyanax altiparanae e o curimbatá Prochilodus lineatus) foram oferecidas como presa para P. corruscans em microcosmos, com três tratamentos de complexidade de habitat (0%, 50% e 100% de cobertura por estruturas submersas). A sobrevivência de presas variou ao longo do tempo e entre espécies (C. piquiti < O. niloticus < A. altiparanae < P. lineatus < I. punctatus), sendo governada, em grande parte, por diferenças espécies-específicas no comportamento das presas, mas também pelo tamanho e defesas morfológicas das mesmas. A complexidade de habitat não afetou diretamente a piscivoria de P. corruscans, mas, na presença do predador, algumas espécies-presa alteraram seu comportamento quanto ao uso de micro-habitat e grau de agregação entre os níveis de complexidade de habitat. Pseudoplatystoma corruscans predou preferencialmente sobre os indivíduos menores das espécies invasoras que apresentaram estruturas morfológicas defensivas pouco desenvolvidas e que não formavam cardu...

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Section: Methodsmentioning

confidence: 99%

Experimental assessment of the effects of a Neotropical nocturnal piscivore on juvenile native and invasive fishes

et al. 2012

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“…Data treatment was descriptive, since multiple-choice experiments are still the target of much discussion in the literature (PETERSON; RENAUD, 1989;ROA, 1992;LOCKWOOD, 1998;RAFFA et al, 2002;PRINCE et al, 2004). Data from experimental and autogenic controls were compared by t test analysis.…”

Section: Statistical Treatmentmentioning

confidence: 99%

Feeding preference of the sea urchin Lytechinus variegatus (Lamarck, 1816) on seaweeds

2008

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A B S T R A C TSeaweeds exhibit different strategies to minimize the damage caused by herbivores and also to influence the feeding preference of these consumers. This study evaluated the feeding preference of the sea urchin Lytechinus variegatus through multiple-choice experiments using the seaweeds Caulerpa racemosa, Dictyota menstrualis, Osmundaria obtusiloba, Plocamium brasiliense, Sargassum sp., and Ulva sp. In order to verify the importance of morphological and chemical aspects on this feeding preference, two assay-types were carried out using live and powdered macroalgae, respectively. Two different methods were employed to analyze the results obtained: comparison between biomass losses versus autogenic changes, and inclusion of autogenic values in biomass loss through herbivory. In both experiments a clear differential consumption of certain species of seaweeds by L. variegatus was observed, in the following decreasing order of preference: R E S U M OAs macroalgas apresentam diversos tipos de estratégias para minimizar os danos gerados por herbívoros que influenciam a preferência alimentar dos consumidores. Este estudo avaliou a preferência alimentar do ouriço-do-mar Lytechinus variegatus em experimentos de múltipla escolha utilizando as macroalgas bentônicas Caulerpa racemosa, Dictyota menstrualis, Osmundaria obtusiloba, Plocamium brasiliense, Sargassum sp., e Ulva sp. Para verificar a importância dos aspectos morfológicos e químicos na preferência, os ensaios foram realizados com algas vivas e em pó, respectivamente. Foram utilizados dois métodos distintos de análise de dados: comparação entre a perda de biomassa e as mudanças por autogenia, e a incorporação dos valores de autogenia à perda de biomassa por herbivoria. Em ambos os experimentos observou-se uma clara preferência de L. variegatus por certas espécies de macroalgas em relação a outras, em ordem decrescente de preferência: C. racemosa ≈ Ulva sp. > O. obtusiloba ≈ Sargassum sp. > P. brasiliense > D. menstrualis. Além disso, constatou-se que os dois métodos de análise produziram resultados muito similares. De acordo com os resultados, a preferência alimentar de L. variegatus é provavelmente condicionada pela química defensiva produzida por P. brasiliense e D. menstrualis e aspectos morfológicos presentes em C. racemosa, Ulva sp., O. obtusiloba e Sargassum sp.

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“…In laboratory tests T. ventricosus preferred the alga Dictyota cervicornis over seagrass (T. testudinum) and the alga Galaxaura oblongata, but exhibited no preference between the latter two (Prince et al 2004). In our experiment, T. ventricosus that were fed several species of macroalgae grew three times faster than urchins fed seagrass alone.…”

Section: Discussionmentioning

confidence: 95%

Habitat-dependent growth in a Caribbean sea urchin Tripneustes ventricosus: the importance of food type

Maciá

Robinson

2008

Helgol Mar Res

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The sea urchin Tripneustes ventricosus is a common, yet relatively poorly known, grazer of seagrass beds and coral reefs throughout the Caribbean. We compared the size and abundance of urchins between adjacent seagrass and coral reef habitats (where macroalgae are the dominant primary producers). We also conducted a laboratory experiment comparing the growth rate of juvenile urchins fed a diet of either macroalgae or seagrass. Reef urchins had signiWcantly larger test diameter than those in the seagrass on some sampling dates. This size diVerence may be at least partially explained by diet, because laboratory-reared urchins fed macroalgae grew signiWcantly faster than those fed seagrass. The seagrass population, however, was stable over time, whereas the reef population exhibited strong Xuctuations in abundance. Overall, our study indicates that both the seagrass and coral reef habitats are capable of supporting healthy, reproductive populations of T. ventricosus. Each, however, appears to oVer a distinct advantage: faster growth on the reef and greater population stability in the seagrass.

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Design and analysis of multiple choice feeding preference data

Cited by 51 publications

References 11 publications

Experimental assessment of the effects of a Neotropical nocturnal piscivore on juvenile native and invasive fishes

Experimental assessment of the effects of a Neotropical nocturnal piscivore on juvenile native and invasive fishes

Feeding preference of the sea urchin Lytechinus variegatus (Lamarck, 1816) on seaweeds

Habitat-dependent growth in a Caribbean sea urchin Tripneustes ventricosus: the importance of food type

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