• Source: Crown shyness

Crown shyness (also canopy disengagement, canopy shyness, or inter-crown spacing) is a phenomenon observed in some tree species, in which the crowns of fully stocked trees do not touch each other, forming a canopy with channel-like gaps.
The phenomenon is most prevalent among trees of the same species, but also occurs between trees of different species. There exist many hypotheses as to why crown shyness is an adaptive behavior, and research suggests that it might inhibit spread of leaf-eating insect larvae.




Possible physiological explanations


The exact physiological basis of crown shyness is uncertain. The phenomenon has been discussed in scientific literature since the 1920s. The variety of hypotheses and experimental results might suggest that there are multiple mechanisms across different species, an example of convergent evolution.
Some hypotheses contend that the interdigitation of canopy branches leads to "reciprocal pruning" of adjacent trees: trees in windy areas suffer physical damage as they collide with each other during winds; the abrasions and collisions induce a crown shyness response. Studies suggest that lateral branch growth is largely uninfluenced by neighbours until disturbed by mechanical abrasion. If the crowns are artificially prevented from colliding in the winds, they gradually fill the canopy gaps. This explains instances of crown shyness between branches of the same organism. Proponents of this idea cite that shyness is particularly seen in conditions conducive to this pruning, including windy forests, stands of flexible trees, and early succession forests where branches are flexible and limited in lateral movement. According to this theory, variable flexibility in lateral branches greatly influences the degree of crown shyness.
Similarly, some research suggests that constant abrasion at growth nodules disrupts bud tissue such that it is unable to continue with lateral growth. Australian forester M.R. Jacobs, who studied the crown shyness patterns in eucalyptus in 1955, believed that the trees' growing tips were sensitive to abrasion, resulting in canopy gaps. Miguel Franco (1986) observed that the branches of Picea sitchensis (Sitka spruce) and Larix kaempferi (Japanese larch) suffered physical damage due to abrasion, which killed the leading shoots.
A prominent hypothesis is that canopy shyness has to do with mutual light sensing by adjacent plants. The photoreceptor-mediated shade avoidance response is a well-documented behavior in a variety of plant species. Neighbor detection is thought to be a function of several unique photoreceptors. Plants can sense the proximity of neighbors by sensing backscattered far-red light, a task widely thought to be accomplished by the activity of the phytochrome photoreceptors. Many species of plant respond to an increase in far-red light (and, by extension, encroaching neighbors) by directing growth away from the far-red stimulus and by increasing the rate of elongation. Similarly, plants use blue light to induce the shade-avoidance response, likely playing a role in the recognition of neighboring plants, though this was just starting to be recognised in 1988.
The characterization of these behaviors might suggest that crown shyness is simply the result of mutual shading based on well-understood shade avoidance responses. Malaysian scholar Francis S.P. Ng, who studied Dryobalanops aromatica, suggested that the growing tips were sensitive to light levels and stopped growing when nearing the adjacent foliage due to the induced shade.
A 2015 study has suggested that Arabidopsis thaliana shows different leaf placement strategies when grown amongst kin and unrelated conspecifics, shading dissimilar neighbors and avoiding kin. This response was shown to be contingent on the proper functioning of multiple photosensory modalities. A 1998 study proposed similar systems of photoreceptor-mediated inhibition of growth as explanations of crown shyness, though a causal link between photoreceptors and crown asymmetry had yet to be experimentally proven. This might explain instances of intercrown spacing that are only exhibited between conspecifics.




Species


Trees that display crown shyness patterns include:

Species of Dryobalanops, including Dryobalanops lanceolata and Dryobalanops aromatica (kapur)
Some species of eucalypt
Pinus contorta or lodgepole pine
Avicennia germinans or black mangrove
Schefflera pittieri
Clusia alata
K. Paijmans observed crown shyness in a multi-species group of trees, comprising Celtis spinosa and Pterocymbium beccarii




References






External links


Media related to Crown shyness at Wikimedia Commons
• Source: Crown Shyness

Crown Shyness is the second studio album by British punk rock band Trash Boat, released on 20 July 2018 by Hopeless Records. It was produced by Andrew Wade at The Audio Compound in Orlando.




Background


Crown Shyness was recorded at The Audio Compound in Orlando, Florida with producer Andrew Wade. He mixed the album, before it was mastered by Alan Douches.




Release


Trash Boat announced their second studio album, Crown Shyness, on 14 May 2018 alongside the lead single "Shade". Their second single "Inside Out" was released on 20 June. The band released their third single "Old Soul" on 19 July
The album was released on 20 July, debuting at No. 2 on Billboard's Heatseekers Albums Chart.




Critical reception



The album received largely positive reviews.
The Soundboard Reviews in a positive review said: "Crown Shyness is a genuinely great album, not only seeing Trash Boat settle on an identity that works for them, but also moving away from pop-punk almost entirely, now dialing up the hardcore influences that’s seen them get the most praise, as well as Wonder Years-esque alt-rock that makes this melancholy-drenched sound so much more secure in its intent."
In an 5/5 review from New Noise Magazine, Nathaniel Lay said: Trash Boat have a grittier, hardcore-influenced style of punk rock that combines the best elements of Polar Bear Club, Rise Against, and even Thrice. Their sophomore full-length with Hopeless, Crown Shyness, is a ten-track experience of pure bliss, perfectly blending melody and rage into one hard-hitting and memorable disc."




Track listing


All songs written by Trash Boat.




Personnel


Personnel per booklet.
Trash Boat

Tobi Duncan – lead vocals
Dann Bostock – rhythm guitar
Ryan Hyslop – lead guitar
James Grayson – bass guitar
Oakley Moffatt – drums
Additional Musicians

Chris Brian Moore - cello
Production

Andrew Wade – producer, recording, mixing
Alan Douches – mastering
Artwork

Sam Dunn – album artwork, layout




Charts






References

Kata Kunci Pencarian:

• Kanopi (biologi)
• Ekstraversi dan introversi
• Quiet: The Power of Introverts in a World That Can't Stop Talking
• Crown shyness
• Crown Shyness
• Crown Shy
• A Prayer for the Crown-Shy
• Shyness
• Trash Boat
• Mount Madja-as
• Crown (botany)
• James Kent (chef)
• Rainforest