Predation by Neomysis mercedis: effects of temperature, Daphnia magna size and prey density on ingestion rate and size selectivity

Autor:	Paulinus Chigbu, Thomas H. Sibley
Rok vydání:	1994
Předmět:	Neomysis biology Ecology Daphnia magna Functional response Branchiopoda Aquatic Science biology.organism_classification Daphnia Population density Optimal foraging theory Predation
Zdroj:	Freshwater Biology. 32:39-48
ISSN:	1365-2427 0046-5070
Popis:	SUMMARY 1. Neomysis mercedis predation rates on Daphnia magna were determined under laboratory conditions. There were generally no consistent differences between the number of Daphnia ingested at 10 and 14°C. 2. At each temperature, the number of prey consumed increased with mysid size and decreased with Daphnia size. 3. For small prey the relationship between ingestion rate and prey density represented a Type II functional response. However, for larger prey there was no significant relationship between density of prey and consumption by mysids. 4. The pattern of size-selective predation by Neomysis was studied to test the optimal foraging hypothesis. For prey populations with mixed size classes, the smallest size of prey was consumed most frequently but intermediate size prey provided the greatest biomass. These observations are contrary to our predictions based on calculations of profitability of different sizes of prey.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::dcf27e097347fc8c589dbf1039ab5f1b https://doi.org/10.1111/j.1365-2427.1994.tb00864.x Zobrazit plný text záznamu Plný text