Planktivorous fish positively select Daphnia bearing advanced embryos

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62156489%3A43210%2F20%3A43916427" target="_blank" >RIV/62156489:43210/20:43916427 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60077344:_____/20:00538605 RIV/60076658:12310/20:43901129 RIV/00216224:14310/20:00115592

Výsledek na webu

<a href="https://doi.org/10.1071/MF18466" target="_blank" >https://doi.org/10.1071/MF18466</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1071/MF18466" target="_blank" >10.1071/MF18466</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Planktivorous fish positively select Daphnia bearing advanced embryos

Popis výsledku v původním jazyce

The top-down effect of fish predation on reproduction success of Daphnia females was investigated in an outdoor mesocosm experiment with natural (oligotrophic) food conditions. The planktivorous fish, sunbleak (Leucaspius delineatus, 4.9 individuals m-3) was introduced into a half of mesocosms after the first sampling of zooplankton to compare daphnid life-history traits with and without fish predators. Our results showed selective fish predation on the daphnid females with advanced developmental stages of embryos. The Daphnia populations exposed to fish exhibited a lower proportion of females with advanced embryos over those with earlier embryonal stages. Fish predators obviously were attracted to more visible females bearing larger embryos, with well-developed pigmented eyes. Simultaneously, we found a smaller daphnid body length in the mesocosms with fish than in those that were fishless. However, the daphnid clutch size did not reflect their body-length pattern and, surprisingly, decreased regardless of fish presence or absence since the first sampling day, probably owing to deterioration of food quality (mean seston carbon: phosphorus ratio similar to 238). Nevertheless, this selective elimination of the females with advanced embryos, together with the overall decrease in daphnid fitness, can strengthen the deceleration of its population growth under fish predation.

Název v anglickém jazyce

Planktivorous fish positively select Daphnia bearing advanced embryos

Popis výsledku anglicky

The top-down effect of fish predation on reproduction success of Daphnia females was investigated in an outdoor mesocosm experiment with natural (oligotrophic) food conditions. The planktivorous fish, sunbleak (Leucaspius delineatus, 4.9 individuals m-3) was introduced into a half of mesocosms after the first sampling of zooplankton to compare daphnid life-history traits with and without fish predators. Our results showed selective fish predation on the daphnid females with advanced developmental stages of embryos. The Daphnia populations exposed to fish exhibited a lower proportion of females with advanced embryos over those with earlier embryonal stages. Fish predators obviously were attracted to more visible females bearing larger embryos, with well-developed pigmented eyes. Simultaneously, we found a smaller daphnid body length in the mesocosms with fish than in those that were fishless. However, the daphnid clutch size did not reflect their body-length pattern and, surprisingly, decreased regardless of fish presence or absence since the first sampling day, probably owing to deterioration of food quality (mean seston carbon: phosphorus ratio similar to 238). Nevertheless, this selective elimination of the females with advanced embryos, together with the overall decrease in daphnid fitness, can strengthen the deceleration of its population growth under fish predation.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10617 - Marine biology, freshwater biology, limnology

Projekt

<a href="/cs/project/GA17-09310S" target="_blank" >GA17-09310S: Rybníky jako modely pro studium diversity a dynamiky planktonu hypetrofních mělkých jezer</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Marine and Freshwater Research

ISSN

1323-1650

e-ISSN

—

Svazek periodika

71

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

AU - Austrálie

Počet stran výsledku

7

Strana od-do

505-511

Kód UT WoS článku

000526573200009

EID výsledku v databázi Scopus

2-s2.0-85072101533