Browsing by Author "Wieters, Evie"

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    Observations on the early development of the kelpfish Myxodes viridis (Clinidae) with the first description of their spawning habitat in subtidal kelp forests (Lessonia trabeculata)
    (2021) Ruz, Catalina S.; Garmendia, Vladimir; Munoz-Cordovez, Rodrigo; Wieters, Evie; Perez-Matus, Alejandro
    The spawning sites, embryonic development, and initial larval stages were described for the Chilean kelpfish, Myxodes viridis. Six different egg clutches were found attached by an elastic filament to the fronds of the subtidal kelp, Lessonia trabeculata, at shallow depths (0-7 m). All egg clutches were cared for by one large (>15 cm TL) male, and egg color varied depending on the developmental stage. Embryonic development until hatching was categorized into 7 stages, which were completed within about 18 days in the laboratory. Recently hatched larvae presented fully pigmented eyes, a well-developed mouth with major shape changes in the head during the first week suggesting their ability to feed on plankton early in their larval development.
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    Predator traits determine food-web architecture across ecosystems
    (2019) Brose, Ulrich; Archambault, Phillippe ; Barnes, Andrew D.; Bersier, Louis Felix; Boy, Thomas; Canning Clode, João; Conti, Erminia; Días, Marta; Digel, Christoph; Dissanayake, Awantha; Flores, Augusto A. V.; Fussmann, Katarina; Gauzens, Benoit ; Gray, Clare; Häussler, Johanna; Hirt, Myriam R.; Jacob, Ute; Jochum, Malte; Kéfi, Sonia; McLaughlin, Orla; MacPherson, Muriel M.; Latz, Ellen; Layer Dobra, Katrin; Legagneux, Pierre; Li, Yuanheng; Madeira, Carolina; Martínez, Neo D.; Mendonça, Vanessa; Mulder, Christian; Navarrete Campos, Sergio Andrés; O’Gorman, Eoin J.; Ott, David; Paula, José; Perkins, Daniel; Piechnik, Denise; Pokrovsky, Ivan; Raffaelli, David; Rall, Björn C.; Rosenbaum, Benjamin; Ryser, Remo; Silva, Ana; Sohlström, Esra H.; Sokolova, Natalia; Thompson, Murray S. A.; Thompson, Ross M.; Vermandele, Fanny; Vinagre, Catarina; Wang, Shaopeng; Wefer, Jori M.; Williams, Richard J.; Wieters, Evie; Woodward, Guy; Iles , Alison C.
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    Removal of intertidal grazers by human harvesting leads to alteration of species interactions, community structure and resilience to climate change
    (2019) Chaverra, Ana; Wieters, Evie; Foggo, Andy; Knights, Antony M.
    Extreme fluctuations in abiotic conditions can induce a biological stress response (e.g. bleaching) detrimental to an organism's health. In some instances, organisms can recover if conditions are alleviated, such as through co-occurrence with other species that confer protection. Biodiverse, multitrophic communities are increasingly recognised as important promoters of species persistence and resilience under environmental change. On intertidal shores, the role of grazers as top-down determinants of algal community structure is well recognised. Similarly, the harvesting of grazers for human consumption is increasingly prevalent with potential to greatly alter the community dynamics. Here, we assess how differences in harvesting pressure of grazers under three management regimes (no-take; managed access; open-access) alters the trophic interactions between grazers, and algal communities. Grazer density and body size frequencies were different among regimes leading to changes in the photosynthetic performance and recovery of crustose coralline algae (CCA) post-bleaching, as well as their presence altering the strength of interactions between species. The exclusion of grazers from patches using cages led to different emergent communities and reduced negative correlations between taxa. The absence of larger grazers (> 9 cm) at the managed access site led to macroalgal overgrowth of bleached CCA negatively affecting its recovery, whereas no-take or open-access led to a moderated algal growth and a shift from competitive to facilitative interactions between algal species. Given that CCA play an important role in the population growth and development of other species, the choice of management measure should be carefully considered before implementation, depending on objectives.