scholarly journals Biotic and abiotic factors associated with altitudinal variation in plant traits and herbivory in a dominant oak species

2016 ◽  
Vol 103 (12) ◽  
pp. 2070-2078 ◽  
Author(s):  
Luis Abdala-Roberts ◽  
Sergio Rasmann ◽  
Jorge C. Berny-Mier y Terán ◽  
Felisa Covelo ◽  
Gaétan Glauser ◽  
...  
Keyword(s):  
Plant Traits ◽  
Abiotic Factors ◽  
Altitudinal Variation ◽  
Factors Associated ◽  
Biotic And Abiotic Factors

Biotic and abiotic factors associated with citrus progressive decline in Fars Province, Iran

2020 ◽  
Vol 168 (7-8) ◽  
pp. 460-468
Author(s):  
Amin Khanchezar ◽  
Keramatollah Izadpanah ◽  
Maryam Mirtalebi
Keyword(s):  
Abiotic Factors ◽  
Fars Province ◽  
Progressive Decline ◽  
Factors Associated ◽  
Biotic And Abiotic Factors

scholarly journals Regional and local determinants of drought resilience in tropical forests

2021 ◽  
Author(s):  
Renan Köpp Hollunder ◽  
Mário Garbin ◽  
Fabio Rubio Scarano ◽  
Pierre Mariotte
Keyword(s):  
Tropical Forest ◽  
Tropical Forests ◽  
Vegetation Structure ◽  
Plant Traits ◽  
Forest Type ◽  
Abiotic Factors ◽  
Future Climate Change ◽  
Biotic And Abiotic Factors ◽  
Drought Resilience ◽  
Dry Tropical Forests

The increase in severity of droughts associated with greater mortality and reduced vegetation growth is one of the main threats to tropical forests. Drought resilience of tropical forests is affected by multiple biotic and abiotic factors varying at different scales. Identifying those factors can help understanding the resilience to ongoing and future climate change. Altitude leads to high climate variation and to different forest formations, principally moist or dry tropical forests with contrasted vegetation structure. Each tropical forest can show distinct responses to droughts. Locally, topography is also a key factor controlling biotic and abiotic factors related to drought resilience in each forest type. Both dry tropical forests and ridges (steeper and drier habitats) are more sensitive to droughts than moist tropical forest and valleys (flatter and wetter habitats). The most important biotic factors are leaf economic and hydraulic plant traits, and vegetation structure. The most important abiotic factors are soil nutrients, water availability and microclimate. Here we show that topography has key roles controlling biotic and abiotic factors in each forest type. Our synthesis highlights that gradients of altitude and topography are essential to understand tropical forest’s resilience to future drought events. We described important factors related to drought resilience, however many important knowledge gaps remain. Filling those gaps will help improve future practices and studies about mitigation capacity, conservation, and restoration of tropical ecosystems.

scholarly journals Flow cytometric measurements as a proxy for sporulation intensity in the cultured macroalga Ulva (Chlorophyta)

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Omri Nahor ◽  
Cristina F. Morales-Reyes ◽  
Gianmaria Califano ◽  
Thomas Wichard ◽  
Alexander Golberg ◽  
...  
Keyword(s):  
Flow Cytometry ◽  
Life Cycle ◽  
Abiotic Factors ◽  
Physiological Status ◽  
Seaweed Cultivation ◽  
Reproductive Growth ◽  
Biotic And Abiotic Factors ◽  
Flow Cytometric ◽  
Abiotic Stimuli ◽  
Fundamental Shift

Abstract Controlling the life cycle of the green macroalga Ulva (Chlorophyta) is essential to maintain its efficient aquaculture. A fundamental shift in cultivation occurs by transforming the thallus cells into gametangia and sporangia (sporulation), with the subsequent release of gametes and zoids. Sporulation occurrence depends on algal age and abiotic stimuli and is controlled by sporulation inhibitors. Thus, quantification of sporulation intensity is critical for identifying the biotic and abiotic factors that influence the transition to reproductive growth. Here, we propose to determine the sporulation index by measuring the number of released gametes using flow cytometry, in proportion to the total number of thallus cells present before the occurrence of the sporulation event. The flow cytometric measurements were validated by manually counting the number of released gametes. We observed a variation in the autofluorescence levels of the gametes which were released from the gametangia. High autofluorescence level correlated to phototactically active behaviour of the gametes. As autofluorescence levels varied between different groups of gametes related to their mobility, flow cytometry can also determine the physiological status of the gametes used as feedstock in seaweed cultivation.

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