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Start Over Coverage 235-240

1. A new species, Gnathia nkulu sp. n. (Crustacea: Isopoda: Gnathiidae) from southern Africa

Creator:
Smit, Nico J. and Van As, Jo G.
Format:
print
Type:
model:internalpart and TEXT
Subject:
Gnathia nkulu, description, taxonomy, and morphology
Language:
English
Description:
A new species, Gnathia nkulu sp. n. is described from material collected off the South African coast at 80-200m depth. It differs from the intertidal species Gnathia africana Barnard, 1914 in that the mediofrontal process is not deeply divided into two lobes, article 2 of the pylopod is rounded and small wart-like tubercles and long simple setae are present on both the cephalosome and pereon.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

2. Photoinhibition of photosynthesis in Minquartia guianensis and Swietenia macrophylla inferred by monitoring the initial fluorescence

Creator:
Dias, D. P. and Marenco, R. A.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
Amazonia, chlororespiration, chronic photoinhibition, dynamic photoinhibition, photodamage, and photoprotection
Language:
Multiple languages
Description:
We assessed the effect of the exposure to full sunlight (5, 35, and 120 min, i.e. T5, T35, and T120) on fluorescence parameters of two young tropical trees, Swietenia macrophylla, a gap-demanding species, and Minquartia guianensis, a shade tolerant species. Fluorescence parameters (F0, Fm, Fv/Fm) were recorded before treatments and after the transition to low irradiance (LI). Recovery from photoinhibition (measured as Fv/Fm) was monitored for 24 h at LI. In Swietenia, an almost complete restoration of the Fv/Fm values occurred in T5 and T35 plants, when a rise in F0 was observed after the transition to LI. This was inferred as indicative of dynamic photoinhibition. T120 led to a decline in F0 in Minquartia, but not in Swietenia. The plants of both species were unable to recovery from photoinhibition after 24 h at LI, when F0 declined or remained unchanged. This was interpreted as indicative of chronic photoinhibition. Compared with Swietenia, Minquartia was more susceptible to photoinhibition, as indicated by lower Fv/Fm values. and D. P. Dias, R. A. Marenco.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public