Inter‐population differences in feeding ecology under nitrogen‐limited diets: Field growth and the role of cannibalism in limiting/improving reserve accumulation

2019 ◽  
Vol 40 (3) ◽  
Author(s):  
Claudia Bas ◽  
Jesús Nuñez ◽  
Eduardo Spivak ◽  
Tomás Luppi
Keyword(s):  
Feeding Ecology ◽  
Population Differences ◽  
Field Growth ◽  
Reserve Accumulation

Population dynamics and feeding ecology of juvenile Australian salmon (Arripis trutta) in Westren Port, Victoria

1982 ◽  
Vol 33 (2) ◽  
pp. 369 ◽  
Author(s):  
AI Robertson
Keyword(s):  
Population Dynamics ◽  
Water Column ◽  
Feeding Ecology ◽  
Age Group ◽  
Gill Raker

Juveniles (0 + age group) of both subspecies of the Australian salmon were captured over eelgrass meadows in Western Port at various times between October 1974 and February 1976. The western subspecies and the eastern subspecies were present from August through April, and December through May, respectively. The western subspecies always fed on benthic-dwelling prey including fishes, crabs and shrimps, and the eastern subspecies fed on prey which inhabited the water column (crustacean larvae, insects and epitokous polychaetes) in December but switched to benthic-dwelling prey (fishes, small squid, benthic crustaceans and polychaetes) in May. The role of different gill-raker number and morphology in effecting dietary separation of the subspecies is unclear.

Feeding ecology of the non-indigenous fish Hypomesus nipponensis in Lake Ulungur, China: insight into the relationship between its introduction and the collapse of the native Eurasian perch population

2013 ◽  
Vol 64 (6) ◽  
pp. 549
Author(s):  
Xiaoyu Zhou ◽  
Zhongjun Hu ◽  
Qigen Liu ◽  
Lili Yang ◽  
Yubo Wang
Keyword(s):  
Feeding Ecology ◽  
Important Food ◽  
Eurasian Perch ◽  
Chironomid Larvae ◽  
Feeding Spectrum ◽  
Index Of Relative Importance ◽  
The Relationship ◽  
Japanese Smelt ◽  
Insight Into

Studies of feeding ecology are essential in gaining an understanding of how established non-indigenous fish species interact with the invaded communities. In the present study, we investigated the composition and seasonal variation in the diet of the introduced Japanese smelt Hypomesus nipponensis, a small planktivorous fish, in Lake Ulungur, China. The objective was to examine the ecological role of this established non-indigenous smelt through the analysis of its diet, which might give more insight into the relationship between its introduction and the collapse of the native Eurasian perch population. Results showed that the Japanese smelt had a broader feeding spectrum than had been previously reported. Of 10 taxonomic or ecological categories of food, cladocerans (54.70%) and rotifers (15.39%) were the most important food items in terms of the index of relative importance (IRI), whereas surface food and chironomid larvae were the most important by weight. Although cladocerans were consistently the most important food, rotifers and copepods, together with surface food and chironomid larvae, substituted when cladocerans were scarcer. Because both rotifers and chironomid larvae are important food of larval and young perch, introduction of Japanese smelt into the lake might be responsible for the collapse of the perch population because of the suppression of rotifers and chironomid larvae in spring through seasonal predation.

ROLE OF ENTEROCOCCI IN CHEDDAR CHEESE: GROWTH OF ENTEROCOCCI DURING MANUFACTURE AND CURING1

1973 ◽  
Vol 36 (12) ◽  
pp. 613-618 ◽  
Author(s):  
Jane P. Jensen ◽  
G. W. Reinbold ◽  
c. J. Washam ◽  
E. R. Vedamuthu
Keyword(s):  
Cheddar Cheese ◽  
Rapid Decrease ◽  
Growth Patterns ◽  
Population Differences ◽  
Streptococcus Faecalis

Eight lots of Cheddar cheese were manufactured to determine the microbiological response of two strains each of Streptococcus faecalis and Streptococcus durans when used as supplemental starters in combination with a commercial lactic culture. Each lot consisted of a control vat of cheese manufactured with the lactic starter only, and an experimental vat of cheese containing the lactic starter and one of the enterococcus strains. Combinations of two curing temperatures ( 7.2 and 12.8 C) and two early cooling treatments (air vs. brine cooling) were used for cheeses from each vat to determine environmentally-induced variability. Growth patterns were monitored throughout the manufacture period up to the end of pressing, and during curing up to 6 months. Enterococcus populations showed little or no decrease when the cheeses were being pressed, whereas populations in control cheeses decreased over the same period. During curing, control cheeses cured at 7.2 C showed marked population decreases over the 6 months; those cured at 12.8 C showed a rapid decrease followed by an upsurge in population. Populations of S. faecalis in the experimental cheeses decreased only slightly, and S. durans showed almost no decrease. Generally, cheeses cured at 7.2 C showed the greatest numerical survival and there appeared to be no population differences caused by early cooling treatment.

Feeding ecology and trophic role of sea urchins in a tropical seagrass community

1993 ◽  
Vol 45 (2-3) ◽  
pp. 205-229 ◽  
Author(s):  
David W. Klumpp ◽  
J.T. Salita-Espinosa ◽  
M.D. Fortes
Keyword(s):  
Feeding Ecology ◽  
Sea Urchins ◽  
Seagrass Community ◽  
Trophic Role

scholarly journals Brain size evolution in pipefishes and seahorses: the role of feeding ecology, life history and sexual selection

2016 ◽  
Vol 30 (1) ◽  
pp. 150-160 ◽  
Author(s):  
M. Tsuboi ◽  
A. C. O. Lim ◽  
B. L. Ooi ◽  
M. Y. Yip ◽  
V. C. Chong ◽  
...  
Keyword(s):  
Sexual Selection ◽  
Life History ◽  
Feeding Ecology ◽  
Brain Size ◽  
Size Evolution

Replication in interaction and working memory research: Révész (2012) and Goo (2012)

2015 ◽  
Vol 48 (4) ◽  
pp. 545-555 ◽  
Author(s):  
Susan Gass ◽  
Lorena Valmori
Keyword(s):  
Working Memory ◽  
Second Language Acquisition ◽  
Working Memory Capacity ◽  
Age Groups ◽  
Memory Capacity ◽  
Population Differences ◽  
Thought Processes ◽  
Target Structure ◽  
Memory Research

This paper argues for the replication of two studies, both of which consider feedback and working memory. In the first part of this paper, we discuss the role of interaction-based research and working memory research in second language acquisition research. We then describe two studies that have unified these two areas in recent published articles and discuss ways that replication can further our knowledge in how working memory capacity can impact the benefits of feedback. We emphasize the importance of replication in a number of different areas, including grammatical complexity of the target structure and the nature of working memory tests, in scoring, actual tests, and modes of delivery. Additionally, we discuss the possibilities for replication in the area of population differences, in particular, age groups and more lasting effects as would be found in delayed post-tests. Finally, we point out another means of gathering information about thought processes and suggest the value of adding stimulated recalls to the existing data.

scholarly journals A functional evaluation of feeding in the surgeonfish Ctenochaetus striatus : the role of soft tissues

2018 ◽  
Vol 5 (1) ◽  
pp. 171111 ◽  
Author(s):  
Sterling B. Tebbett ◽  
Christopher H. R. Goatley ◽  
Víctor Huertas ◽  
Michalis Mihalitsis ◽  
David R. Bellwood
Keyword(s):  
Feeding Ecology ◽  
High Speed ◽  
Soft Tissues ◽  
Particulate Material ◽  
Functional Evaluation ◽  
Micro Computed Tomography ◽  
Lower Jaw ◽  
Computed Tomography Scanning ◽  
Tomography Scanning

Ctenochaetus striatus is one of the most abundant surgeonfishes on Indo-Pacific coral reefs, yet the functional role and feeding ecology of this species remain unclear. This species is reported to possess a rigid structure in its palate that is used for scraping, but some authors have reported that this element is comprised of soft tissue. To resolve the nature and role of this structure in the feeding ecology of C. striatus we examined evidence from anatomical observations, scanning electron microscopy, histology, X-ray micro-computed tomography scanning, high-speed video and field observations. We found that C. striatus from the Great Barrier Reef possess a retention plate (RP) on their palates immediately posterior to the premaxillary teeth which is soft, covered in a thin veneer of keratin with a papillate surface. This RP appears to be used during feeding, but does not appear to be responsible for the removal of material, which is achieved primarily by a fast closure of the lower jaw. We infer that the RP acts primarily as a ‘dustpan’, in a ‘dustpan and brush’ feeding mechanism, to facilitate the collection of particulate material from algal turfs.

Sign in / Sign up

Export Citation Format

Share Document