Do rats and pigeons readily acquire instrumental responses for food in the presence of free food?

Welker, Robert L.; Weidenman, Meredith

doi:10.3758/bf03209628

Cited by 3 publications

(2 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the one hand, I disagree with Welker and Weidenman (1978) that existing data fail to support the statement that naive animals acquire an operant response for food in the presence of free food. On the other hand, I wholeheartedly agree that at present only a dearth of data exist concerning acquisition.…”

contrasting

confidence: 38%

A note on the acquisition of responding for food in the presence of free food

Osborne

1978

Animal Learning & Behavior

View full text Add to dashboard Cite

contrasting

confidence: 38%

A note on the acquisition of responding for food in the presence of free food

Osborne

1978

Animal Learning & Behavior

View full text Add to dashboard Cite

“…Dissolved oxygen (DO) was measured following the classical Winkler titration from each depth [7]. Concentrations of nitrate, nitrite, ammonia following standard methods [8] by using an autoanalyser (Skalar Analytical).…”

Section: Concentrations Of Dissolved Oxygen and Nutrientsmentioning

confidence: 99%

Bacterial Community Composition Markedly Altered by Coastal Hypoxia

et al. 2019

View full text Add to dashboard Cite

Monsoonal upwelling along south and central west coast of India leads to intense biological productivity. As a consequence of excess organic matter production following upwelling during June-October and low dissolved oxygen in the upwelled waters, denitrification occurs in the near shore waters. Implicitly, these processes ought to bring alterations in microbial communities. Therefore, diversity and community structure of bacteria from subsurface layers of a tropical region experiencing intense seasonal lows of oxygen were analyzed through sequencing of 16S rRNA gene clones. The overall diversity was more during hypoxic period of Fall intermonsoon (FIM, October) compared either to Spring intermonsoon (SIM, March) or summer monsoon (SuM, June) months. As many as 14 lineages of bacterial domains: Gammaproteobacteria (37%), Alphaproteobacteria (21%), Cyanobacteria (20%), Deltaproteobacteria (3%), Firmicutes (3%), Betaproteobacteria (2%), Acidobacteria (2%), Actinobacteria (7%), Marinimicrobia (2%), Bacteroidetes (1%), Verrucomicrobia (1%), Planctomycetes (0.4%), Chloroflexi (0.2%) and Omnitrophica bacterium (0.2%), were recognized from our coastal location. Notably, sequences of Planctomycetes, Chloroflexi and Omnitrophica bacterium were found exclusively during FIM. A generally higher representation of sequences of Betaproteobacteria during SuM and of Actinobacteria and Firmicutes during SIM was discernible. This study is thus useful to recognize that microbial community might undergo strong temporal shifts in the monsoon affected tropical coastal ecosystems. Keywords Tropical coastal ecosystem Á Goa Á Upwelling Á Hypoxia Á Bacterial community Á 16S rDNA clones Á Phylogenetic composition Electronic supplementary material The online version of this article (

show abstract

Picoplanktonic methane production in eutrophic surface waters

Tenorio,

Farías

2024

Biogeosciences

View full text Add to dashboard Cite

Abstract. Over the past decade, extensive research has delved into the methane (CH4) paradox, which involves aerobic CH4 production. We present noteworthy observations of CH4 oversaturation within the surface layer of the central Chile upwelling zone (36° S, 73° W) over two consecutive seasonal cycles (2018–2021). Complementing these observations, CH4 cycling experiments were conducted, utilizing distinct plankton fractions (encompassing the natural planktonic community, fractions < 150, < 3 and < 0.2 µm), in different productivity periods of phytoplanktonic production and composition throughout the year. Our findings underscore the pivotal role of picoplankton (< 3 µm) in CH4 production on the ocean surface, contrasting with the limited contribution of larger microorganisms (< 150 µm). Notably, incubations with methylated substrates, such as methylphosphonic acid (MPn) and trimethylamine (TMA), induce heightened CH4 production within the picoplanktonic fraction. This phenomenon is consistently observed during both upwelling (austral spring–summer) and non-upwelling (winter) seasons, with significance in the latter period, when Synechococcus sp. exhibits notably high relative abundance. Long-term microcosm experiments highlight the crucial roles played by heterotrophic bacteria and cyanobacteria in methylotrophic methanogenesis. This process enhances CH4 production, facilitated by the recycling of dissolved organic carbon (DOC). Picoplankton emerges as a pivotal factor influencing the recycling of methylated substrates, and it is responsible for maintaining CH4 supersaturation. These findings provide valuable insights into the biogeochemical processes driving CH4 dynamics, particularly in highly productive upwelling areas.

show abstract

Do rats and pigeons readily acquire instrumental responses for food in the presence of free food?

Cited by 3 publications

References 12 publications

A note on the acquisition of responding for food in the presence of free food

A note on the acquisition of responding for food in the presence of free food

Bacterial Community Composition Markedly Altered by Coastal Hypoxia

Picoplanktonic methane production in eutrophic surface waters

Contact Info

Product

Resources

About