The nutritional condition of moose co‐varies with climate, but not with density, predation risk or diet composition

Oikos ◽  
2021 ◽  
Vol 2022 (1) ◽  
Author(s):  
Sarah R. Hoy ◽  
Jennifer S. Forbey ◽  
Daniel P. Melody ◽  
Leah M. Vucetich ◽  
Rolf O. Peterson ◽  
...  
Keyword(s):  
Predation Risk ◽  
Diet Composition ◽  
Nutritional Condition

Resource partitioning by two syntopic sister species of butterflyfish (Chaetodontidae)

2017 ◽  
Vol 98 (7) ◽  
pp. 1767-1773 ◽  
Author(s):  
Ana M.R. Liedke ◽  
Roberta M. Bonaldo ◽  
Bárbara Segal ◽  
Carlos E.L. Ferreira ◽  
Lucas T. Nunes ◽  
...  
Keyword(s):  
Puerto Rico ◽  
Resource Partitioning ◽  
Diet Composition ◽  
Foraging Behaviour ◽  
Nutritional Condition ◽  
Ecological Communities ◽  
Substrate Selection ◽  
Feeding Rates ◽  
Bite Rate ◽  
Close Phylogenetic Relationship

Resource partitioning is considered one of the main processes driving diversification in ecological communities because it allows coexistence among closely related and ecologically equivalent species. We combined three complementary approaches, i.e. the evaluation of foraging behaviour, diet composition and nutritional condition (RNA:DNA ratio), to assess feeding by two closely related (sister) butterflyfishes that are syntopic in Puerto Rico. Chaetodon capistratus had a higher abundance and higher bite rate and selected octocorals and hard corals for feeding, whereas Chaetodon striatus fed preferentially on sandy substrates. Cnidarians and polychaetes were the most representative diet items for both species, but C. capistratus preferred the former (Feeding Index of 74.3%) and C. striatus the latter (Feeding Index of 60.4%). Similar RNA:DNA ratios for both species suggest that, although they differ in feeding rates and diet, C. capistratus and C. striatus have similar nutritional fitness. Therefore, these species are both zoobenthivores but show clear differences in their substrate selection. The differences in the use of foraging substrate by C. capistratus and C. striatus, despite their close phylogenetic relationship and similar diets, suggest that these species coexist by resource partitioning.

The influence of plant defensive chemicals, diet composition, and winter severity on the nutritional condition of a free-ranging, generalist herbivore

Oikos ◽  
2016 ◽  
Vol 126 (2) ◽  
Author(s):  
Grace L. Parikh ◽  
Jennifer Sorensen Forbey ◽  
Brecken Robb ◽  
Rolf O. Peterson ◽  
Leah M. Vucetich ◽  
...  
Keyword(s):  
Diet Composition ◽  
Nutritional Condition ◽  
Generalist Herbivore ◽  
Free Ranging ◽  
Winter Severity

Benefits of migration in relation to nutritional condition and predation risk in a partially migratory moose population

Ecology ◽  
2014 ◽  
Vol 95 (1) ◽  
pp. 225-237 ◽  
Author(s):  
Kevin S. White ◽  
Neil L. Barten ◽  
Stacy Crouse ◽  
John Crouse
Keyword(s):  
Predation Risk ◽  
Nutritional Condition ◽  
Moose Population

Elevated nest predation risk promotes offspring size variation in birds with prolonged parental care.

2019 ◽  
Author(s):  
Gretchen F. Wagner ◽  
Emeline Mourocq ◽  
Michael Griesser
Keyword(s):  
Predation Risk ◽  
Reproductive Cycle ◽  
Perceived Risk ◽  
Nest Predation ◽  
Bird Species ◽  
Size Variation ◽  
Egg Laying ◽  
Offspring Size ◽  
Natural Predation ◽  
Risk Spreading

Predation of offspring is the main cause of reproductive failure in many species, and the mere fear of offspring predation shapes reproductive strategies. Yet, natural predation risk is ubiquitously variable and can be unpredictable. Consequently, the perceived prospect of predation early in a reproductive cycle may not reflect the actual risk to ensuing offspring. An increased variance in investment across offspring has been linked to breeding in unpredictable environments in several taxa, but has so far been overlooked as a maternal response to temporal variation in predation risk. Here, we experimentally increased the perceived risk of nest predation prior to egg-laying in seven bird species. Species with prolonged parent-offspring associations increased their intra-brood variation in egg, and subsequently offspring, size. High risk to offspring early in a reproductive cycle can favour a risk-spreading strategy particularly in species with the greatest opportunity to even out offspring quality after fledging.

Diet composition and prey selection of vendace Coregonus albula in the mesotrophic, temperate Lake Ostrowite (Northern Poland)

2008 ◽  
Vol 37 (1) ◽  
Author(s):  
Tomasz Kakareko ◽  
Paweł Napiórkowski ◽  
Jacek Kozłowski
Keyword(s):  
Diet Composition ◽  
Prey Selection ◽  
Temperate Lake ◽  
Coregonus Albula ◽  
Northern Poland ◽  
Mesotrophic Lake ◽  
Selection Of

Diet composition and prey selection of vendaceLake Ostrowite is a mesotrophic lake in Northern Poland 280.7 ha in area and 43 m deep at its deepest point. To study vendace (

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