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  1. Article ; Online ; Research data: (with research data) Intoxicated copepods: ingesting toxic phytoplankton leads to risky behaviour.

    Lasley-Rasher, Rachel S / Nagel, Kathryn / Angra, Aakanksha / Yen, Jeannette

    Proceedings. Biological sciences

    2016  Volume 283, Issue 1829

    Abstract: Understanding interactions between harmful algal bloom (HAB) species and their grazers is essential for determining mechanisms of bloom proliferation and termination. We exposed the common calanoid copepod, Temora longicornis to the HAB species ... ...

    Abstract Understanding interactions between harmful algal bloom (HAB) species and their grazers is essential for determining mechanisms of bloom proliferation and termination. We exposed the common calanoid copepod, Temora longicornis to the HAB species Alexandrium fundyense and examined effects on copepod survival, ingestion, egg production and swimming behaviour. A. fundyense was readily ingested by T. longicornis and significantly altered copepod swimming behaviour without affecting copepod survival or fitness. A. fundyense caused T. longicornis to increase their swimming speed, and the straightness of their path long after the copepods had been removed from the A. fundyense treatment. Models suggest that these changes could lead to a 25-56% increase in encounter frequency between copepods and their predators. This work highlights the need to determine how ingesting HAB species alters grazer behaviour as this can have significant impacts on the fate of HAB toxins in marine systems.
    MeSH term(s) Animals ; Behavior, Animal/drug effects ; Behavior, Animal/physiology ; Copepoda/drug effects ; Copepoda/microbiology ; Copepoda/physiology ; Dinoflagellida/pathogenicity ; Ecosystem ; Food Chain ; Harmful Algal Bloom ; Host-Pathogen Interactions ; Models, Biological ; Neurotoxins/analysis ; Neurotoxins/toxicity ; Phytoplankton/pathogenicity ; Swimming
    Chemical Substances Neurotoxins
    Language English
    Publishing date 2016--27
    Publishing country England
    Document type Journal Article ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 209242-6
    ISSN 1471-2954 ; 0080-4649 ; 0962-8452 ; 0950-1193 ; 0080-4649 ; 0962-8452 ; 0950-1193
    ISSN (online) 1471-2954
    ISSN 0080-4649 ; 0962-8452 ; 0950-1193
    DOI 10.1098/rspb.2016.0176
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online ; Research data: (with research data) Assessing the in situ fertilization status of two marine copepod species, Temora longicornis and Eurytemora herdmani; how common are unfertilized eggs in nature?

    Lasley-Rasher, Rachel S / Kramer, Andrew M / Burdett-Coutts, Victoria / Yen, Jeannette

    PloS one

    2014  Volume 9, Issue 11, Page(s) e112920

    Abstract: We utilized an egg staining technique to measure the in situ fertilization success of two marine copepod species, Temora longicornis and Eurytemora herdmani from May to October 2008 in coastal Maine and correlated fertilization success with environmental ...

    Abstract We utilized an egg staining technique to measure the in situ fertilization success of two marine copepod species, Temora longicornis and Eurytemora herdmani from May to October 2008 in coastal Maine and correlated fertilization success with environmental conditions in their habitat. T. longicornis is a free spawning species that releases eggs into the ambient seawater after mating. In contrast, E. herdmani carries eggs in an egg sac until they hatch. The proportion of fertilized eggs within E. herdmani egg sacs was significantly higher than the freely spawned clutches of T. longicornis. This may be a result of the asymmetrical costs associated with carrying vs. spawning unfertilized eggs. T. longicornis frequently laid both fertilized and unfertilized eggs within their clutch. T. longicornis fertilization was negatively associated with chlorophyll concentration and positively associated with population density in their local habitat. The fertilization status of E. herdmani egg sacs was high throughout the season, but the proportion of ovigerous females was negatively associated with an interaction between predators and the proportion of females in the population. This study emphasizes that, in addition to population level processes, community and ecosystem level processes strongly influence the fertilization success and subsequent productivity of copepods.
    MeSH term(s) Animals ; Chlorophyll/chemistry ; Copepoda/growth & development ; Copepoda/physiology ; Ecosystem ; Female ; Fertilization/physiology ; Male ; Ovum/physiology ; Reproduction/physiology ; Seasons ; Seawater ; Zooplankton/physiology
    Chemical Substances Chlorophyll (1406-65-1)
    Language English
    Publishing date 2014
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1932-6203
    ISSN (online) 1932-6203
    DOI 10.1371/journal.pone.0112920
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Assessing the in situ fertilization status of two marine copepod species, Temora longicornis and Eurytemora herdmani; how common are unfertilized eggs in nature?

    Rachel S Lasley-Rasher / Andrew M Kramer / Victoria Burdett-Coutts / Jeannette Yen

    PLoS ONE, Vol 9, Iss 11, p e

    2014  Volume 112920

    Abstract: We utilized an egg staining technique to measure the in situ fertilization success of two marine copepod species, Temora longicornis and Eurytemora herdmani from May to October 2008 in coastal Maine and correlated fertilization success with environmental ...

    Abstract We utilized an egg staining technique to measure the in situ fertilization success of two marine copepod species, Temora longicornis and Eurytemora herdmani from May to October 2008 in coastal Maine and correlated fertilization success with environmental conditions in their habitat. T. longicornis is a free spawning species that releases eggs into the ambient seawater after mating. In contrast, E. herdmani carries eggs in an egg sac until they hatch. The proportion of fertilized eggs within E. herdmani egg sacs was significantly higher than the freely spawned clutches of T. longicornis. This may be a result of the asymmetrical costs associated with carrying vs. spawning unfertilized eggs. T. longicornis frequently laid both fertilized and unfertilized eggs within their clutch. T. longicornis fertilization was negatively associated with chlorophyll concentration and positively associated with population density in their local habitat. The fertilization status of E. herdmani egg sacs was high throughout the season, but the proportion of ovigerous females was negatively associated with an interaction between predators and the proportion of females in the population. This study emphasizes that, in addition to population level processes, community and ecosystem level processes strongly influence the fertilization success and subsequent productivity of copepods.
    Keywords Medicine ; R ; Science ; Q
    Subject code 590
    Language English
    Publishing date 2014-01-01T00:00:00Z
    Publisher Public Library of Science (PLoS)
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article: Non-consumptive effects of predator presence on copepod reproduction: insights from a mesocosm experiment

    Heuschele, Jan / Ceballos, Sara / Andersen Borg, Christian Marc / Bjærke, Oda / Isari, Stamatina / Lasley-Rasher, Rachel / Lindehoff, Elin / Souissi, Anissa / Souissi, Sami / Titelman, Josefin

    Marine biology

    Volume v. 161,, Issue no. 7

    Abstract: Reproduction in planktonic animals depends on numerous biotic and abiotic factors. One of them is predation pressure, which can have both direct consumptive effects on population density and sex ratio, and non-consumptive effects, for example on mating ... ...

    Abstract Reproduction in planktonic animals depends on numerous biotic and abiotic factors. One of them is predation pressure, which can have both direct consumptive effects on population density and sex ratio, and non-consumptive effects, for example on mating and migration behaviour. In copepods, predator vulnerability depends on their sex, motility pattern and mating behaviour. Therefore, copepods can be affected at multiple stages during the mating process. We investigated the reproductive dynamics of the estuarine copepod Eurytemora affinis in the presence and absence of its predator the mysid Neomysis integer in a mesocosm experiment. We found that the proportion of ovigerous females decreased in the presence of predators. This shift was not caused by differential predation as the absolute number of females was unaffected by mysid presence. Presence of predators reduced the ratio of males to non-ovigerous females, but not by predation of males. Our combined results suggest that the shift from ovigerous to non-ovigerous females under the presence of predators was caused by either actively delayed egg production or by shedding of egg sacs. Nauplii production was initially suppressed in the predation treatment, but increased towards the end of the experiment. The proportion of fertilized females was similar in both treatments, but constantly fell behind model predictions using a random mating model. Our results highlight the importance of non-consumptive effects of predators on copepod reproduction and hence on population dynamics.
    Keywords Eurytemora affinis ; random mating ; egg production ; population density ; predation ; mating behavior ; males ; sex ratio ; females ; population dynamics ; predators
    Language English
    Document type Article
    ISSN 0025-3162
    Database AGRIS - International Information System for the Agricultural Sciences and Technology

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