Vliv všežravosti na druhovou stabilitu v tri-trofických potravních sítích

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60077395%3A_____%2F05%3A00003891" target="_blank" >RIV/60077395:_____/05:00003891 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Adaptive omnivory and species coexistence in tri-trophic food webs

Popis výsledku v původním jazyce

The commonness of omnivory in natural communities is puzzling, because simple dynamic models of tri-trophic systems with omnivory are prone to species extinction. In particular, the intermediate consumer is frequently excluded by the omnivore at high levels of enrichment. We explore theoretically how species permanence in tri-trophic systems is affected if the omnivore forages adaptively according to the "diet rule", i.e., feeds on the less profitable one of its two prey species only if the more profitable one is sufficiently rare. We show that, compared to systems where omnivory is fixed, adaptive omnivory may indeed facilitate 3-species persistence. However, facilitation of 3-species coexistence requires that the intermediate consumer is a more profitable prey than the basal resource. Whether omnivory is fixed or adaptive, 3-species permanence is most likely when profitability (= conversion efficiency into omnivores) is low for basal resources and high for intermediate consumers.

Název v anglickém jazyce

Adaptive omnivory and species coexistence in tri-trophic food webs

Popis výsledku anglicky

The commonness of omnivory in natural communities is puzzling, because simple dynamic models of tri-trophic systems with omnivory are prone to species extinction. In particular, the intermediate consumer is frequently excluded by the omnivore at high levels of enrichment. We explore theoretically how species permanence in tri-trophic systems is affected if the omnivore forages adaptively according to the "diet rule", i.e., feeds on the less profitable one of its two prey species only if the more profitable one is sufficiently rare. We show that, compared to systems where omnivory is fixed, adaptive omnivory may indeed facilitate 3-species persistence. However, facilitation of 3-species coexistence requires that the intermediate consumer is a more profitable prey than the basal resource. Whether omnivory is fixed or adaptive, 3-species permanence is most likely when profitability (= conversion efficiency into omnivores) is low for basal resources and high for intermediate consumers.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

EH - Ekologie – společenstva

OECD FORD obor

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Projekt

<a href="/cs/project/GA201%2F03%2F0091" target="_blank" >GA201/03/0091: Matematické modely adaptivního chování a populační dynamiky</a><br>

Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2005

Kód důvěrnosti údajů

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

Název periodika

Theoretical Population Biology

ISSN

0040-5809

e-ISSN

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Svazek periodika

67

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

15

Strana od-do

85-99

Kód UT WoS článku

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EID výsledku v databázi Scopus

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