Mechanisms and consequences of intra- and interspecific interference competition in Idotea baltica (Pallas) and Idotea emarginata (Fabricius) (Crustacea: Isopoda): A laboratory study of possible proximate causes of habitat segregation

Franke, Heinz-Dieter; Janke, Michael

doi:10.1016/s0022-0981(97)00253-0

Cited by 44 publications

(46 citation statements)

References 23 publications

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“…Earlier studies working on marine isopods were faced with the same problem, as severe antagonistic interference in I. baltica is known to occur already at low densities, causing high mortality on juveniles and individuals which are about to moult (Franke and Janke 1998). Thus, laboratory populations reach their carrying capacity at a low density even though all necessary resources are still available in excess ).…”

Section: Discussionmentioning

confidence: 99%

A summer heat wave decreases the immunocompetence of the mesograzer, Idotea baltica

2010

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Extreme events associated with global change will impose increasing stress on coastal organisms. How strong biological interactions such as the host-parasite arms-race are modulated by environmental change is largely unknown. The immune system of invertebrates, in particular phagocytosis and phenoloxidase activity response are key defence mechanisms against parasites, yet they may be sensitive to environmental perturbations. We here simulated an extreme event that mimicked the European heat wave in 2003 to investigate the eVect of environmental change on the immunocompetence of the mesograzer Idotea baltica. Unlike earlier studies, our experiment aimed at simulation of the natural situation as closely as possible by using long acclimation, a slow increase in temperature and a natural community setting including the animals' providence with natural food sources (Zostera marina and Fucus vesiculosus). Our results demonstrate that a simulated heat wave results in decreased immunocompetence of the mesograzer Idotea baltica, in particular a drop of phagocytosis by 50%. This suggests that global change has the potential to signiWcantly aVect host-parasite interactions.

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Section: Discussionmentioning

confidence: 99%

A summer heat wave decreases the immunocompetence of the mesograzer, Idotea baltica

2010

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“…They provide both food and shelter from predators. Idotea baltica is capable of leaving this benthic habitat actively to escape from severe intra-or interspecific competition (Franke and Janke 1998). Passive dislocation appears along with macroalgae that become detached from their substratum and float to the surface.…”

Section: Behaviourmentioning

confidence: 99%

“…They are distributed benthically along the coast from the supratidal down to subtidal habitats (Naylor 1972). The distribution of Idotea baltica and Idotea emarginata is primarily the result of interspecific competition and subsequent habitat segregation (Franke and Janke 1998). Although they prefer benthic habitats, all species also raft on floating objects at the sea surface; most of them, however, only sporadically.…”

Section: Introductionmentioning

confidence: 99%

Behavioural and metabolic adaptations of marine isopods to the rafting life style

et al. 2006

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Rafting on floating objects is a common dispersal mechanism for many marine invertebrates. In order to identify adaptations to the rafting life style, we compared behavioural and metabolic characteristics of two isopods, the obligate rafter Idotea metallica and the facultative rafter Idotea baltica. In laboratory experiments, I. metallica showed low locomotive activity and a tight association to the substratum. Idotea baltica, in contrast, was more active with more frequent excursions in the surrounding water column. Oxygen consumption rates were similar in both species. Idotea metallica fed on zooplankton making this species widely independent of autochthonous food resources of the raft. Feeding rates and digestive enzyme activities were low in I. metallica. Reduced egestion rates may indicate slow gut passage and, thus, efficient resorption of nutrients. Efficient food utilization and the ability to accumulate high amounts of storage products, i.e. lipids, indicate a possible adaptation of I. metallica to low food availability or starvation. The feeding behaviour of I. baltica, in contrast, was more herbivorous and appeared wasteful and inefficient. Low lipid contents in I. baltica also indicate poor storage reserves. Thus, I. baltica requires a permanent access to food.

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“…In addition, an overlap in trophic niches is expected as both consumers are known to feed on a variety of food sources, e.g. microalgae and detritus (Franke and Janke 1998;Blanchard et al 2000;Schanz et al 2002;Hagerthey et al 2002).…”

Section: Introductionmentioning

confidence: 99%

Altered complementary feeding strategies of the consumers Hydrobia ulvae and Idotea emarginata via passive selectivity

et al. 2009

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This study aimed to identify diVerences in selectivity, foraging behaviour and complementary feeding of two benthic consumers (the isopod Idotea emarginata and the snail Hydrobia ulvae) using traditional cell counting as an indicator for algal biomass reduction and stable isotope labelling to detect diVerences in assimilation and digestion. We hypothesized that even when active feeding preferences of food components are not apparent, passive selectivity via mechanisms such as food assimilation and digestion can be of relevance. Algal biomass was reduced to a similar degree by the grazers independently from grazer and prey combinations without any indication for an active choice of food components. However, the isotope labelling approach indicated that passive selectivity can alter complementary feeding strategies, as we detected shifts in feeding preferences in relation to food quantity and competition. Thus, stable isotope labelling of food components opens up new perspectives in community ecology, allowing assessment of such complex mechanisms as passive selectivity, complementary feeding and competition.

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Mechanisms and consequences of intra- and interspecific interference competition in Idotea baltica (Pallas) and Idotea emarginata (Fabricius) (Crustacea: Isopoda): A laboratory study of possible proximate causes of habitat segregation

Cited by 44 publications

References 23 publications

A summer heat wave decreases the immunocompetence of the mesograzer, Idotea baltica

A summer heat wave decreases the immunocompetence of the mesograzer, Idotea baltica

Behavioural and metabolic adaptations of marine isopods to the rafting life style

Altered complementary feeding strategies of the consumers Hydrobia ulvae and Idotea emarginata via passive selectivity

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