Phenology of predation on insects in a tropical forest: temporal variation in attack rate on dummy caterpillars

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60077344%3A_____%2F16%3A00455017" target="_blank" >RIV/60077344:_____/16:00455017 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60076658:12310/16:43890634

Výsledek na webu

<a href="http://onlinelibrary.wiley.com/doi/10.1111/btp.12268/abstract" target="_blank" >http://onlinelibrary.wiley.com/doi/10.1111/btp.12268/abstract</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1111/btp.12268" target="_blank" >10.1111/btp.12268</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Phenology of predation on insects in a tropical forest: temporal variation in attack rate on dummy caterpillars

Popis výsledku v původním jazyce

Temporal patterns of attack rates on insect n tropical forest habitats have not been studied systematically, because it is very difficult to observe and record elusive predation of omnipresent and tiny insect. Yet, in communities of tropical insects, adult abundance tends to fluctuate widely, perhaps owing exactly to predator–prey dynamics. However, the identity of predators of insects in tropical forests is poorly known, and their responses to temporal variation in prey abundance have rarely been explored. We recorded incidence and shape of marks of attacks on dummy caterpillars (proxy of predation rate) in a sub-montane tropical forest in Uganda during a year-long experiment, and explored correlations with inferred caterpillar abundance. Applying the highest and lowest observed daily attack rates on clay dummies over a realistic duration of the larval stage of butterflies, indicates that the temporal variation in attack rate could cause more than 10-fold temporal variation in caterpillar survival. Inferred predators were almost exclusively invertebrates, and beak marks of birds were very scarce. Attack rates by wasps varied more over time than those of ants that were present across all seasons. Attack rates on dummies peaked during the two wet seasons, and appeared congruent with inferred peaks in caterpillar density. This suggests (1) a functional response (predators shifting to more abundant resource) or adaptive timed phenology (predators timing activity or breeding to coincide with seasonal peaks in prey abundance) of predators, rather than a numerical response (predator populations increasing following peaks in prey abundance); and (2) that predation would dampen abundance fluctuations of tropical Lepidoptera communities.

Název v anglickém jazyce

Phenology of predation on insects in a tropical forest: temporal variation in attack rate on dummy caterpillars

Popis výsledku anglicky

Temporal patterns of attack rates on insect n tropical forest habitats have not been studied systematically, because it is very difficult to observe and record elusive predation of omnipresent and tiny insect. Yet, in communities of tropical insects, adult abundance tends to fluctuate widely, perhaps owing exactly to predator–prey dynamics. However, the identity of predators of insects in tropical forests is poorly known, and their responses to temporal variation in prey abundance have rarely been explored. We recorded incidence and shape of marks of attacks on dummy caterpillars (proxy of predation rate) in a sub-montane tropical forest in Uganda during a year-long experiment, and explored correlations with inferred caterpillar abundance. Applying the highest and lowest observed daily attack rates on clay dummies over a realistic duration of the larval stage of butterflies, indicates that the temporal variation in attack rate could cause more than 10-fold temporal variation in caterpillar survival. Inferred predators were almost exclusively invertebrates, and beak marks of birds were very scarce. Attack rates by wasps varied more over time than those of ants that were present across all seasons. Attack rates on dummies peaked during the two wet seasons, and appeared congruent with inferred peaks in caterpillar density. This suggests (1) a functional response (predators shifting to more abundant resource) or adaptive timed phenology (predators timing activity or breeding to coincide with seasonal peaks in prey abundance) of predators, rather than a numerical response (predator populations increasing following peaks in prey abundance); and (2) that predation would dampen abundance fluctuations of tropical Lepidoptera communities.

Druh

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

CEP obor

EH - Ekologie – společenstva

OECD FORD obor

—

Projekt

<a href="/cs/project/GP14-32024P" target="_blank" >GP14-32024P: Ptáci, mravenci a netopýři jako predátoři limitující členovce a herbivorii v tropických lesních ekosystémech podél kompletního výškového gradientu</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název periodika

Biotropica

ISSN

0006-3606

e-ISSN

—

Svazek periodika

48

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

8

Strana od-do

229-236

Kód UT WoS článku

000372510600013

EID výsledku v databázi Scopus

2-s2.0-84960250189