Geographical variability in the controls of giant kelp biomass dynamics

The forest-forming giant kelp Macrocystis pyrifera and the communities it supports have been decreasing across their native ranges in many parts of the world. The sudden removal of giant kelp canopies by storms increases space and light for the colonization by understory macroalgae, such as Desmarestia herbacea, which can inhibit M. pyrifera recovery and alter local community composition. Understanding the mechanisms by which algae such as D. herbacea interact with M. pyrifera can provide insight into patterns of kelp forest recovery following these disturbances and can aid in predicting future community structure. This study experimentally tested the independent and combined effects of two likely competitive mechanisms by which D. herbacea might inhibit recovery of M. pyrifera in the Point Loma kelp forest in San Diego, California (USA). Specifically, we conducted field experiments to study the individual and combined effects of shade and scour by D. herbacea on the survival of M. pyrifera microscopic life stages, and the recruitment, survival, and growth of its young sporophytes. Our results show that scour had the strongest negative effect on the survival of M. pyrifera microscopic life stages and recruitment, but shade and scour both adversely affected survival and growth of these sporophytes as they grew larger. Canopy-removing storms are increasing in frequency and intensity, and this change could facilitate the rise of understory species, like D. herbacea, which might alter community succession and recovery of kelp forests.

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The Biology and Ecology of Giant Kelp Forests

10.1525/california/9780520278868.001.0001 ◽

2015 ◽

Cited By ~ 76

Author(s):

David R. Schiel ◽

Michael S. Foster

Keyword(s):

Kelp Forests ◽

Giant Kelp

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Faculty Opinions recommendation of Ocean acidification and seaweed reproduction: increased CO2 ameliorates the negative effect of lowered pH on meiospore germination in the giant kelp Macrocystis pyrifera (Laminariales, Phaeophyceae).

Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature ◽

10.3410/f.717949462.793454665 ◽

2012 ◽

Author(s):

Sean Connell

Keyword(s):

Ocean Acidification ◽

Macrocystis Pyrifera ◽

Giant Kelp ◽

Negative Effect

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Faculty Opinions recommendation of The relationship between tree biodiversity and biomass dynamics changes with tropical forest succession.

Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature ◽

10.3410/f.718483711.793503150 ◽

2015 ◽

Author(s):

Ferdinando Boero ◽

Valeriano Parravicini

Keyword(s):

Tropical Forest ◽

Forest Succession ◽

Biomass Dynamics ◽

The Relationship

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A Theoretical Framework for Examining Geographical Variability in the Microphysical Mechanisms of Precipitation Development.

10.21236/ada170317 ◽

1986 ◽

Author(s):

David B. Johnson

Keyword(s):

Theoretical Framework ◽

Geographical Variability

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The Prevalence and Patterns of Palmaris Longus Muscle Absence in an Iranian Population

International Journal of Medical Toxicology and Forensic Medicine ◽

10.32598/ijmtfm.v9i4.26515 ◽

2019 ◽

Vol 9 (4) ◽

pp. 279-282

Author(s):

Mehdi Forouzesh ◽

Abdolrazagh Barzegar ◽

Fardin Fallah

Keyword(s):

Gender Difference ◽

Clinical Importance ◽

Tendon Graft ◽

Iranian Population ◽

Geographical Variability ◽

Palmaris Longus ◽

Longus Muscle ◽

Palmaris Longus Muscle ◽

And Gender ◽

Gender Specific

Palmaris Longus (PL) is a muscle of the forearm, i.e., not functionally necessary and does not exist in all people. It is a choice for tendon graft and investigating its prevalence is of clinical importance. During April-October 2009, 102 cadavers (78 males, 24 females) were bilaterally necropsied for PL exploration in Zanjan City, Iran. PL Absence (PLA) was observed in 37 (36.3%) cases (28 males, 9 females). PLA prevalence was similar in men (36%) and women (37.5%). Of PLA cases, 19 (51%) were unilateral (14 males, 5 females), and 18 (49%) were bilateral (14 males, 4 females). In conclusion, PLA prevalence of 36.3% in our population was similar to other studies conducted in Iran. We found no gender difference in PLA prevalence and its patterns. Due to geographical variability in PLA rate, future regional and national studies with more magnificent sample sizes are recommended to determine the prevalence and gender-specific patterns of PLA.

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