Phosphorus acquisition and competitive abilities of two herbivorous zooplankton, <i>Daphnia pulex</i> and <i>Ceriodaphnia quadrangula</i>

Iwabuchi, Tsubasa; Urabe, Jotaro

doi:10.1007/s11284-010-0692-4

Cited by 20 publications

(14 citation statements)

References 46 publications

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“…Such an adaptation could give smaller Daphnia a competitive advantage, and (together with their lower vulnerability to visually hunting predators, Gliwicz 1969) can lead to their dominance over large-bodied species. This is consistent with the results of Iwabuchi and Urabe (2010), who demonstrated that small cladocerans such as Ceriodaphnia quadrangula can outcompete larger Daphnia pulex even in the absence of size-selective predation due to their greater ability to benefit from P-rich bacterial food. This is also consistent with the more recent finding by Iwabuchi and Urabe (2012) that the quality of food influences the competitive superiority of a herbivore zooplankton species in terms of threshold food levels.…”

Section: Discussionsupporting

confidence: 92%

Threat or treat: the role of fish exudates in the growth and life history of Daphnia

Maszczyk

Bartosiewicz

2012

Ecosphere

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Abstract. In kairomone studies, it is often implicitly assumed that the only effect of predator exudates on their prey is to trigger anti-predator defenses. However, chemicals originating from fish activity may also fertilize the environment and enhance the growth of zooplankton prey by increasing bacterial food availability. It is necessary to separate these two effects in order to examine the adaptive significance of zooplankton anti-predation defenses and the ability of the prey to benefit from fish-related food.Here, we have employed differential filtration of media to permit assessment of these two effects on growth rate and life history adjustments in two Daphnia species that differ in body size and the ability to collect small particles (greater in small-bodied D. cucullata than in larger D. hyalina). Filters of three mesh sizes were employed: 2 lm (most bacteria pass, but detritus is retained), 0.45 lm (standard) and 0.20 lm (most bacteria and detritus retained).The concentration of kairomones in the fish medium was assumed to be unaffected by filtration. However, the abundance of bacteria in the fish and no-fish media was dependent on the filter mesh size. This influenced the food level and its impact on Daphnia growth rate and life history. The effect of fishrelated bacterial food was greater under low than under high algal food conditions (0.1 and 1.0 mg C/L) and more significant in D. cucullata.Use of media with a diminished bacterial abundance revealed the effect of kairomones alone as (1) reduced growth rate, size at reproduction, number of pre-adult instars, age at maturation, level of the integrated egg and body lipids, egg volume, and (2) increased number of eggs per clutch vs. body length. These effects were equally strong in both species, despite differences in body size, and were greater at the higher algal food concentration. The findings of this study indicate the need to re-analyze and possibly revise the results of previous kairomone studies, especially those using media filtered through mesh sizes coarser than 0.2 lm that were performed under limiting algal food conditions or with species particularly able to benefit from bacterial food.

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Section: Discussionsupporting

confidence: 92%

Threat or treat: the role of fish exudates in the growth and life history of Daphnia

Maszczyk

Bartosiewicz

2012

Ecosphere

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“…It thus seems that consumer stoichiometry is not a useful predictor of arthropod responses to variation in resource nutrient content. We note that theories on ecological stoichiometry like the growth rate theory, which relates body P content to the RNA content and indirectly to individual growth rates [35], focused originally on aquatic species under P-saturated conditions and the growth rate theory has mainly been applied in aquatic systems, notably on Daphnia [27], [37], [55]–[57], but see [10].…”

Section: Discussionmentioning

confidence: 99%

Ecological Stoichiometry and Density Responses of Plant-Arthropod Communities on Cormorant Nesting Islands

2013

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Seabirds deposit large amounts of nutrient rich guano on their nesting islands. The increased nutrient availability strongly affects plants and consumers. Consumer response differs among taxonomic groups, but mechanisms causing these differences are poorly understood. Ecological stoichiometry might provide tools to understand these mechanisms. ES suggests that nutrient rich taxa are more likely to be nutrient limited than nutrient poorer taxa and are more favored under nutrient enrichment. Here, we quantified differences in the elemental composition of soil, plants, and consumers between islands with and without nesting cormorant colonies and tested predictions made based on ES by relating the elemental composition and the eventual mismatch between consumer and resource stoichiometry to observed density differences among the island categories. We found that nesting cormorants radically changed the soil nutrient content and thereby indirectly plant nutrient content and resource quality to herbivores. In contrast, consumers showed only small differences in their elemental composition among the island categories. While we cannot evaluate the cause of the apparent homeostasis of invertebrates without additional data, we can conclude that from the perspective of the next trophic level, there is no difference in diet quality (in terms of N and P content) between island categories. Thus, bottom-up effects seemed mainly be mediated via changes in resource quantity not quality. Despite a large potential trophic mismatch we were unable to observe any relation between the invertebrate stoichiometry and their density response to nesting cormorant colonies. We conclude that in our system stoichiometry is not a useful predictor of arthropod responses to variation in resource nutrient content. Furthermore, we found no strong evidence that resource quality was a prime determinant of invertebrate densities. Other factors like resource quantity, habitat structure and species interactions might be more important or masked stoichiometric effects.

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“…P-deficient diets can cause a significant drop in body P content of Daphnia (DeMott et al 1998) and inhibit its growth and reproduction (Schulz & Sterner 1999;DeMott et al 2001;Weider et al 2004). Several investigators also observed that the P content of algal food can affect the threshold food concentration of cladocerans (Boersma & Kreutzer 2002;Iwabuchi & Urabe 2010) and determine their growth rates. However, the growth and fecundity of Bosmina with lower body P content were not affected by the P content of algal food (Schulz & Sterner 1999).…”

Section: Discussionmentioning

confidence: 99%

“…In general, the growth of Daphnia is determined by the availability and quality of food (Acharya et al 2004) and phosphorus (P) concentration is a key aspect of food quality for freshwater zooplankton (Gulati & DeMott 1997). Iwabuchi and Urabe (2010) found that the P content of algae affects the threshold food level of cladocerans at which an individual's growth rate equals zero and that the somatic growth rate of Daphnia is higher when the animal is fed P-rich food. Other studies have shown that cellular P content can affect the growth and reproduction of cladocerans under phosphate deficiency condition (Schulz & Sterner 1999).…”

Section: Introductionmentioning

confidence: 99%

The influence of phosphorus concentration on the population dynamics and resting egg formation of two cladocerans

Meng

Deng

Zhang

et al. 2014

Journal of Freshwater Ecology

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Laboratory experiments were conducted to evaluate the effects of food phosphorus (P) concentrations on the population dynamics, ephippium production, and resting egg formation of two cladocerans, Moina irrasa and Daphnia similoides, fed on Chlorella vulgaris that were cultured in five different P concentrations (0.05, 0.1, 1, 5, and 10 mg/L). The body length at the first pregnancy of M. irrasa and D. similoides significantly increased with higher P concentration, whereas the maturation time significantly decreased. The maximum population density of M. irrasa (mean AE SD, 6220 AE 1129 ind/L) and D. similoides (1816.5 AE 63.5 ind/L) appeared in the 5 and 10 mg P/L groups, respectively. The maximum male density of M. irrasa (150 AE 113.0 ind/L) appeared in the low P concentration of 0.05 mg/L, whereas it was in the higher P concentrations for D. similoides. The maximum cumulative ephippia number of M. irrasa (51/female) and D. similoides (6.2/female) appeared in the 0.05 and 1 mg P/L groups, respectively. The maximum percentage of ephippia containing resting eggs of M. irrasa (69.3%) appeared in the lowest P concentration. The percentage of ephippia containing resting eggs of D. similoides increased gradually with higher P concentration, and the ratio was above 70% in higher P concentrations (5-10 mg P/L). Our results suggest that low P can advance and induce the production of ephippium in two cladocerans and that higher male density promotes the resting egg formation of cladocerans.

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Phosphorus acquisition and competitive abilities of two herbivorous zooplankton, Daphnia pulex and Ceriodaphnia quadrangula

Cited by 20 publications

References 46 publications

Threat or treat: the role of fish exudates in the growth and life history of Daphnia

Threat or treat: the role of fish exudates in the growth and life history of Daphnia

Ecological Stoichiometry and Density Responses of Plant-Arthropod Communities on Cormorant Nesting Islands

The influence of phosphorus concentration on the population dynamics and resting egg formation of two cladocerans

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