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Lund University Lund University Publications2000-01-01T00:00+00:001dailyPredator ontogeny affects expression of inducible defense morphology in rotifers
https://lup.lub.lu.se/search/publication/7cb53be1-0346-4b7a-a047-8581ad5aa404
Zhang, HuanBrönmark, ChristerHansson, Lars Anders2017-07-20Many prey organisms show induced morphological responses to predators including changes in protective spine length, such as in rotifers, although previous studies have mainly focused on how prey become larger than the predator gape-size optimum. Here we show that a large-sized predator makes prey rotifers escape below the gape-size optimum of the predator by reducing spine length. In experiments and field studies we show that during part of their ontogeny fish larvae feed intensively on the common rotifer Keratella cochlearis, and that larval fish predation reduces rotifer spine length both through induction of shorter spines and selective predation on long-spined individuals. We also describe a global scale pattern in spine length of K. cochlearis, showing an increasing variance in spine length with latitude. This pattern may be explained by differences in fish reproduction from once per year at high latitudes to several times per year at lower latitudes. That spine length is adaptively adjusted to the ontogeny of a dominant predator taxa provides a novel view on our understanding of factors affecting temporal and spatial variations in prey defense morphology.https://lup.lub.lu.se/record/7cb53be1-0346-4b7a-a047-8581ad5aa404http://dx.doi.org/10.1002/ecy.1957pmid:28727143scopus:85034581404engEcology; 98(10), pp 2499-2505 (2017)ISSN: 0012-9658Ecologyfish larvaegape sizeinducible defenseKeratella cochlearismorphologyontogenypredatorpreyrotiferPredator ontogeny affects expression of inducible defense morphology in rotiferscontributiontojournal/articleinfo:eu-repo/semantics/articletextRepeated disturbances affect functional but not compositional resistance and resilience in an aquatic bacterioplankton community
https://lup.lub.lu.se/search/publication/f389fbe5-f4e5-4430-bee4-df2fdd71d2d3
Sjöstedt, JohannaLangenheder, SilkeKritzberg, EmmaKarlsson, Christofer M GLindström, Eva S2018-05-07Disturbances are believed to be one of the main factors influencing variations in community diversity and functioning. Here we investigated if exposure to a pH press disturbance affected the composition and functional performance of a bacterial community and its resistance, recovery and resilience to a second press disturbance (salt addition). Lake bacterial assemblages were initially exposed to reduced pH in six mesocosms whereas another six mesocosms were kept as reference. Seven days after the pH disturbance, three tanks from each treatment were exposed to a salt disturbance. Both bacterial production and enzyme activity were negatively affected by the salt treatment, regardless if the communities had been subject to a previous disturbance or not. However, cell-specific enzyme activity had a higher resistance in communities pre-exposed to the pH disturbance compared to the reference treatment. In contrast, for cell-specific bacterial production resistance was not affected, but recovery was faster in the communities that had previously been exposed to the pH disturbance. Over time, bacterial community composition diverged among treatments, in response to both pH and salinity. The difference in functional recovery, resilience and resistance may depend on differences in community composition caused by the pH disturbance, niche breadth or acquired stress resistance.https://lup.lub.lu.se/record/f389fbe5-f4e5-4430-bee4-df2fdd71d2d3http://dx.doi.org/10.1111/1758-2229.12656scopus:85050464256pmid:29733107engEnvironmental microbiology reports; 10(4), pp 493-500 (2018)ISSN: 1758-2229EcologyBacteria/classificationBacterial Physiological PhenomenaCarbon/metabolismCellulose 1,4-beta-Cellobiosidase/metabolismHydrogen-Ion ConcentrationLakes/microbiologyPlankton/classificationRNA, Ribosomal, 16S/geneticsSalinityStress, Physiological/physiologyWater Microbiologybeta-Glucosidase/metabolismRepeated disturbances affect functional but not compositional resistance and resilience in an aquatic bacterioplankton communitycontributiontojournal/articleinfo:eu-repo/semantics/articletext