Monthly Archives: November 2016

Effect of Paclobutrazol Treatment on Some Leaf Physiological and Biochemical Characteristics of Rejuvenated Coffee (Coffea arabica L.) Trees

Authors: Arsenio D. Ramos and Antonio L. Acedo, Jr.

ABSTRACT

Rejuvenation pruning has been proven effective in bringing back vigor and productivity of old coffee trees. The effectiveness of the present rejuvenation techniques however could be probably enhanced by the application of tree growth regulators with known reinvigorating or tree health enhancing effect such as Paclobutrazol but has not been tried so far. The present study aimed to evaluate some physiological and biochemical responses of the rejuvenated coffee trees to timing and level of PBZ application prior to cutting.
Plants applied with PBZ 2 months prior to pruning had higher leaf internal CO concentration compared to those applied 1 month prior to 2 pruning. Net photosynthesis, transpiration rate, PAR/LAI, chlorophyll content, and leaf N, P, K, Ca and Mg contents did not differ with time of PBZ treatment. Application of 0.5-1.0 g a.i. PBZ per meter canopy span significantly increased transpiration rate, internal COconcentration and 2 chlorophyll content but did not affect the rate of photosynthesis, PAR/LAI, leaf N, P, K, Ca and Mg contents.

Keywords: rejuvenation pruning, Paclobutrazol, growth retardant, physiological and biochemical responses.


Annals of Tropical Research 38(2):74-82(2016)
DOI: https://doi.org/10.32945/atr3825.2016
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Post Biological Assessment of Faunal Resources in The Samar Island Natural Park

Author: Teofanes A. Patindol

ABSTRACT

Samar Island Natural Park (SINP) is regarded as one of the most important areas in terms of biodiversity in the island of Samar and within the greater Mindanao faunal region. Five priority watersheds within the SINP were surveyed for the post biological assessment. These were the watersheds of Taft, Can-avid, Basey, Suribao and Catubig. Standard faunal survey methods such as transect survey, mist netting, and trapping were used during the entire duration of the study. The methods were augmented with ocular observations and ethnobiological interviews.
Of the 182 species of terrestrial vertebrates recorded from SINP, 121 species were birds, 20 were mammals, 18 amphibians and 23 reptiles. The overall endemism is 40%. The 121 species of birds belong to 15 orders and 45 families. Of these, 26% are endemic to the Philippinesand 12% are endemic to the greater Mindanao faunal region. Among avian species, thirteen (11%) are considered threatened or at risk.
Of the 11 mammals, which belong to 6 orders and 9 families, 45% are endemic to the country and 15% are endemic to the greater Mindanao faunal region. Seven (35%) of these species are considered threatened or at risk.
Of the 18 species of amphibians recorded, 2 are introduced and the rest are native to the Philippines. Of the 23 reptiles, 39% are endemic to the country and 3% are endemic to the greater Mindanao faunal region. Among herpetofauna, only one species is considered threatened or at risk.
Samar holds high diversity and high endemism and contains a remarkable number of threatened species being recognized by the international arena in biological diversity conservation, most of which have strong affinity to the Mindanao faunal region. The existing data are sufficient to further highlight the need to establish SINP as conservation priority site in the region.

Keywords: Samar Island Natural Park, faunal diversity, endemism, threatened species


Annals of Tropical Research 38(2):52-73(2016)
DOI: https://doi.org/10.32945/atr3824.2016
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