J 2016

Different hunting strategies of generalist predators result in functional differences

MICHALKO, Radek a Stanislav PEKÁR

Základní údaje

Originální název

Different hunting strategies of generalist predators result in functional differences

Autoři

MICHALKO, Radek (203 Česká republika, garant, domácí) a Stanislav PEKÁR (703 Slovensko, domácí)

Vydání

Oecologia, 2016, 0029-8549

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10600 1.6 Biological sciences

Stát vydavatele

Spojené státy

Utajení

není předmětem státního či obchodního tajemství

Odkazy

Impakt faktor

Impact factor: 3.130

Kód RIV

RIV/00216224:14310/16:00091242

Organizační jednotka

Přírodovědecká fakulta

DOI

UT WoS

000380282100020

Klíčová slova anglicky

Functional diversity; Guilds; Euryphagy; Niche; Spiders; Araneae

Štítky

Změněno: 6. 3. 2018 14:41, Mgr. Lucie Jarošová, DiS.

Anotace

V originále

The morphological, physiological, and behavioural traits of organisms are often used as surrogates for actual ecological functions. However, differences in these traits do not necessarily lead to functional differences and/or can be context–dependent. Therefore, it is necessary to explicitly test whether the surrogates have general ecological relevance. To investigate the relationship between the hunting strategies of predators (i.e., how, where, and when they hunt) and their function, we used euryphagous spiders as a model group. We used published data on the diet composition of 76 spider species based on natural prey and laboratory prey acceptance experiments. We computed differences in the position and width of trophic niches among pairs of sympatrically occurring species. Pairs were made at different classification levels, ranked according to the dissimilarity in their hunting strategies: congeners, confamiliars (as phylogenetic proxies for similarity in hunting strategy), species from the same main class of hunting strategy, from the same supra-class, and from different supra-classes. As for niche position computed from the natural prey analyses, species from the same class differed less than species from different classes. A similar pattern was obtained from the laboratory studies, but the congeners differed less than the species from the same classes. Niche widths were most similar among congeners and dissimilar among species from different supra-classes. Functional differences among euryphagous spiders increased continuously with increasing difference in their hunting strategy. The relative frequency of hunting strategies within spider assemblages can, therefore, influence the food webs through hunting strategy-specific predator–prey interactions.