Non-smooth ecological systems with a switching threshold depending on the pest density and its rate of change

2021 ◽  
Vol 42 ◽  
pp. 101094
Author(s):  
Jiawei Deng ◽  
Sanyi Tang ◽  
Choi-Hong Lai
Keyword(s):  
Ecological Systems ◽  
Rate Of Change ◽  
Switching Threshold ◽  
Pest Density

Decreasing water pressure cues ‘bailout’ in seaweed-associated crustaceans

2020 ◽  
Vol 653 ◽  
pp. 121-129
Author(s):  
RB Taylor ◽  
S Patke
Keyword(s):  
Water Pressure ◽  
Rapid Change ◽  
Brown Seaweed ◽  
Model System ◽  
Rate Of Change ◽  
Suitable Habitat ◽  
Changing Light ◽  
Surface Increase ◽  
Reduced Water ◽  
Transparent Chamber

Small mobile crustaceans are abundant on seaweeds. Many of these crustaceans rapidly abandon their host if it is detached from the seafloor and floats towards the surface, but the trigger for this ‘bailout’ behaviour is unknown. We tested 2 potential cues, i.e. rapid change in light and rapid change in water pressure, using >1 mm epifauna on the brown seaweed Carpophyllum plumosum as a model system. Bailout occurred in response to reduced water pressure, but not to changing light, as (1) bailout occurred at similar rates in light and dark, (2) bailout occurred on the seafloor when water pressure was reduced within a transparent chamber by the equivalent of ~0.5 m depth or more, and (3) little bailout occurred when water pressure was held constant within the chamber while seaweeds were raised to the surface. Increase in pressure (simulating sinking) did not induce bailout. The rate of bailout increased with increasing magnitude of pressure reduction but was not influenced greatly by the rate of change of pressure within the range tested (up to an equivalent of 0.4 m depth s-1). The use of pressure rather than light as a cue for bailout is consistent with the need for seaweed-associated crustaceans to rapidly abandon a detached host and relocate to suitable habitat during both day and night.

Ecological Systems of the Geobiosphere

1986 ◽  
Author(s):  
Heinrich Walter ◽  
Siegmar-W. Breckle
Keyword(s):  
Ecological Systems

SPIRITUAL ISLAM SUNDA DALAM TRADISI HAJAT SOLOKAN

1970 ◽  
Vol 9 (1) ◽  
pp. 98-112
Author(s):  
Imam Setyobudi
Keyword(s):  
Empirical Evidence ◽  
Ecological Systems ◽  
Rice Fields ◽  
Religious Values

This article is the ethnographic notes on leutik Hajat Solokan, aritual ceremony of farmers in Babakan Dago, Rancakalong district,Sumedang West Jawa. This ceremony reflects wisdom values, such asprotecting and maintaining ecological systems which supports their mainjobs, cultivating rice fields. This article provides empirical evidence aboutculture system which packing religious values in order to make it sturdyand stay longer. The writer also found acculturation among some religiousvalues, Hinduism, Chinese, and Islam.

Commons Research and Pastoralism in the Context of Variability

2020 ◽  
Vol 24 (2) ◽  
pp. 272-285
Author(s):  
Jill Philine Blau
Keyword(s):  
Ecological Systems ◽  
Potential Problems ◽  
Pastoral Management ◽  
The Commons

Research has shown that pastoralism and the management of the commons are connected (Bollig and Lesogorol 2016). In this article I discuss how the concept of variability, which emerged from discussions of dryland ecologies in the 1980s (Homewood 2008), can inform and enhance research on the commons and vice versa. Research on the commons can further elucidate the understanding of pastoralist practices. I conclude with reflections drawn from some empirical examples in the literature, the use of the socio-ecological systems (SES) framework, and discuss the benefits and potential problems when applied to heterogeneous and flexible pastoralist practices and to the pastoral management of the commons.

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