Macroalgal Defense against Competitors and Herbivores

Budzałek, Gracjana; Śliwińska‐Wilczewska, Sylwia; Wochna, Agnieszka; Bubak, Iwona; Latała, Adam; Wiktor, Józef

doi:10.3390/ijms22157865

Cited by 14 publications

(14 citation statements)

References 166 publications

(210 reference statements)

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“…One possible explanation for some of the negative effects caused by our macroalgae may be a combination of exploitative competition and allelopathy. Only a few previous studies (Friedlander et al 1996, Xu et al 2012) have investigated allelopathy between macroalgal species, while macroalgal allelopathy on corals is fairly well studied (reviewed by Budzałek et al 2021). Unlike Padina or Sargassum , Galaxaura is known to be strongly allelopathic to corals, although this was demonstrated for a congener to our study species (Rasher and Hay 2010, 2014, Rasher et al 2011).…”

Section: Discussionmentioning

confidence: 99%

Press versus pulse nutrient supply and species interactions mediate growth of coral reef macroalgae

Sura

Gehris

Liang

et al. 2023

Oikos

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Globally, ecosystems are experiencing dramatic alterations in the supply of resources, including nutrients. How the temporal regime (press versus pulse), independent of total resource supply, affects growth and species interactions of primary producers remains unexplored. Coral reefs experience anthropogenic modifications to nutrient regimes, making it critical to understand impacts on primary producers, such as macroalgae. In mesocosms, we examined how three macroalgae respond to temporal pattern in nutrient regime (ambient, press, pulse) and species interactions (alone, pairwise, or all together) in terms of their individual growth and assemblage productivity. We found nutrient regime and species interactions influenced individual growth and total assemblage productivity. Press regimes promoted the highest productivity of total assemblages. We observed species interactions ranging from competitive to facilitative varied between macroalgal species and nutrient regimes. Ours is the first study to demonstrate the temporal regime of nutrient delivery, independent of total nutrient supply, strongly impacts the productivity of species assemblages, the nature and outcome of species interactions, and the relative growth rates of individual producer species. As nutrient regimes increasingly fluctuate for coastal marine ecosystems in the Anthropocene, our findings imply macroalgal community composition may also fluctuate. More broadly, our study highlights the importance of assessing primary producer species' responses to varying nutrient regimes to understand factors structuring their communities.

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Section: Discussionmentioning

confidence: 99%

Press versus pulse nutrient supply and species interactions mediate growth of coral reef macroalgae

Sura

Gehris

Liang

et al. 2023

Oikos

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“…compared to the control. In other works, Budzałek et al (2018Budzałek et al ( , 2021b and Złoch et al (2018) demonstrated that extract and filtrate of U. intestinalis containing water-soluble allelochemical(s) is able to influence the fluorescence parameters of some Baltic cyanobacteria. Budzałek et al (2018) noted that the highest decrease in Fv/Fm for Nostoc sp.…”

Section: Ulva Intestinalis On Photosynthesis Performancementioning

confidence: 97%

Allelopathic effect of Ulva intestinalis thallus on selected Baltic cyanobacteria

Budzałek

Śliwińska‐Wilczewska²

2022

AUPCStudiaNaturae

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Macroalgae have been found to produce active allelochemicals that inhibit of growth other organisms that compete with them for light and space. However, their allelopathic activity on Baltic cyanobacteria is still insufficiently recognised. Therefore, this study aimed to demonstrate the allelopathic effects of Baltic macroalga thallus (Ulva intestinalis) on the growth and photosynthetic activity of three bloom-forming cyanobacteria: Aphanizomenon sp., Nodularia spumigena, and Nostoc sp. This study investigated the cell count of the analysed cyanobacteria (N 105 mL-1), the maximum quantum yield of the second photosystem (PSII) in the dark (Fv/Fm), and the real quantum yield of PSII in the light (ΦPSII) (in the control and the experiments). After 7 days of exposure, the following were added: 0.01, 0.05, and 0.1 g mL-1 of U. intestinalis fresh thallus. It was found that thallus obtained from U. intestinalis had no statistically significant effect on the number of cells of the cyanobacterium Aphanizomenon sp. (at 0.05 and 0.1 g mL-1) and Nostoc sp. (at concentrations of 0.01 and 0.05 g mL−1). On the other hand, it was examined a stimulating effect of 0.01 g mL-1 of the fresh thallus on the number of Aphanizomenon sp. cells which constituted 168%, relative to the control. It was shown that the fresh thallus addition resulted in a decrease in the number of N. spumigena cells (45%, 27%, and 46% after addition of 0.01, 0.05, and 0.1 g wet weight mL−1 of fresh thallus, respectively). In experiments with Nostoc sp., the addition of U. intestinalis thallus has been a negative effect on cyanobacterial growth at 0.1 g mL−1 and constituted 97% of control. It was also found, that U. intestinalis had no allelopathic effect on fluorescence parameters of N. spumigena. All tested concentrations of thallus U. intestinalis (0.01, 0.05, and 0.1 g wet weight mL-1) stimulated the values of Fv/Fm or ΦPSII of cyanobacteria Aphanizomenon sp. and Nostoc sp. compared to the control. These studies help define the role of U. intestinalis allelopathy as a biological factor in the distribution of bloom-forming cyanobacteria in the coastal Baltic Sea region.

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“…All that is required is a shift in thinking so that the response of the system to a basket of stressors dominates the debate rather than the current silo approach of looking at the dose of single stressors in isolation. In chemical ecology, the chemicals function as highly sensitive communicators of information to receptors [ 76 , 77 , 78 , 79 , 80 , 81 ]. These may be predators responding to messages alerting them to the presence of prey (known as kairomones), prey responding to signals from predators (allomones) or signals from potential mates (pheromones).…”

Section: Chemical Ecology Mychorrysal and Microbiome Evidencementioning

confidence: 99%

Low Dose and Non-Targeted Radiation Effects in Environmental Protection and Medicine—A New Model Focusing on Electromagnetic Signaling

Mothersill

Cocchetto

Seymour

2022

IJMS

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The role of signalling in initiating and perpetuating effects triggered by deposition of ionising radiation energy in parts of a system is very clear. Less clear are the very early steps involved in converting energy to chemical and biological effects in non-targeted parts of the system. The paper aims to present a new model, which could aid our understanding of the role of low dose effects in determining ultimate disease outcomes. We propose a key role for electromagnetic signals resulting from physico-chemical processes such as excitation decay, and acoustic waves. These lead to the initiation of damage response pathways such as elevation of reactive oxygen species and membrane associated changes in key ion channels. Critically, these signalling pathways allow coordination of responses across system levels. For example, depending on how these perturbations are transduced, adverse or beneficial outcomes may predominate. We suggest that by appreciating the importance of signalling and communication between multiple levels of organisation, a unified theory could emerge. This would allow the development of models incorporating time, space and system level to position data in appropriate areas of a multidimensional domain. We propose the use of the term “infosome” to capture the nature of radiation-induced communication systems which include physical as well as chemical signals. We have named our model “the variable response model” or “VRM” which allows for multiple outcomes following exposure to low doses or to signals from low dose irradiated cells, tissues or organisms. We suggest that the use of both dose and infosome in radiation protection might open up new conceptual avenues that could allow intrinsic uncertainty to be embraced within a holistic protection framework.

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Macroalgal Defense against Competitors and Herbivores

Cited by 14 publications

References 166 publications

Press versus pulse nutrient supply and species interactions mediate growth of coral reef macroalgae

Press versus pulse nutrient supply and species interactions mediate growth of coral reef macroalgae

Allelopathic effect of Ulva intestinalis thallus on selected Baltic cyanobacteria

Low Dose and Non-Targeted Radiation Effects in Environmental Protection and Medicine—A New Model Focusing on Electromagnetic Signaling

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