Biometric Relationships Study of Tagelus adansonii (Bosc 1801) in Three Different Environments (Deltaic, Estuarine and Lagoon) in Senegal
Jeanne Elisabeth Diouf,
Alioune Faye,
Claudette Soumbane Diatta,
Jean Fall,
Malick Diouf
Issue:
Volume 10, Issue 5, October 2022
Pages:
95-103
Received:
13 August 2022
Accepted:
31 August 2022
Published:
19 September 2022
DOI:
10.11648/j.ajls.20221005.11
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Abstract: In Senegal, several studies have been carried out on molluscs of mangrove ecosystems, particularly on Senilia senilis and Crassostrea tulipa. However, there are other little known mollusc species that inhabit these ecosystems. It is the case of Tagelus adansonii, a bivalve of the family Solecurtidae present only in West Africa and whose biometric relationships are the subject of this study. The study of Tagelus adansonii biometry in Senegal was conducted from July to November 2019. Tagelus adansonii samples were collected together with physico-chemical parameters in four different areas: the Senegal river delta, the Joal-Fadiouth lagoon, the Saloum estuary, and the Casamance estuary. The results of the present study showed that the largest sizes (51.68±7.74 mm) and lowest densities (16±9.30 ind/m2) were noted in the Senegal river delta. However, the smallest sizes (45.57±8.43 mm) and highest densities (48.26±34.21 ind/m2) were recorded in the Joal-Fadiouth lagoon. In the Saloum and Casamance estuary the size and density values were relatively average. The allometric growth is minor for the individuals collected in the Casamance estuary (b=2.71) and in the Senegal river delta (b=2.95), while those sampled in the Joal-Fadiouth lagoon (b=3.02) and in the Saloum estuary (b=3.18) show a major allometric growth. Thus, the results of the present study constitute a basis of information on the biology of T. adansonii that can contribute to the sustainable management of this species.
Abstract: In Senegal, several studies have been carried out on molluscs of mangrove ecosystems, particularly on Senilia senilis and Crassostrea tulipa. However, there are other little known mollusc species that inhabit these ecosystems. It is the case of Tagelus adansonii, a bivalve of the family Solecurtidae present only in West Africa and whose biometric r...
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The Effect of Coffee Expansion on Carbon Stock of Natural Forest in Gidame Woreda, West Ethiopia
Issue:
Volume 10, Issue 5, October 2022
Pages:
104-114
Received:
28 August 2022
Accepted:
6 September 2022
Published:
14 November 2022
DOI:
10.11648/j.ajls.20221005.12
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Abstract: The important climate-related functions of forest ecosystems are carbon sequestration, regulating the global carbon cycle and climate change mitigation. About 80% of the terrestrial carbon is stored as forest biomass and soil organic carbon. Deforestation and forest degradation show an alarming high, mainly due to the conversion of natural forest to commercial and cereal crop production. By considering this issue, this study was conducted with the aim to assess the effect of coffee expansion on carbon stock of the natural forest ecosystem in Gidame woreda. The study site was stratified in two strata: undisturbed natural forest and disturbed coffee forest. A total of 71 nested square sample plot was determined, proportionally allocated (29 for undisturbed and 42 for disturbed/coffee forest) and randomly distributed within each stratum. In both cases, the diameter at breast height and tree height were measured; litter sample was collected by harvesting and weighing technique. A total of 72 composite soil samples were also collected from proportionally and randomly selected 24 sample plots; 10 from undisturbed natural forest and 14 from disturbed coffee forest for SOC quantification in three layers (0-15cm, 16-30cm, and 31-45cm). From these forest inventory data, the above-ground biomass carbon stock was estimated by using allometric equations. The below-ground biomass carbon stock was derived from the above-ground carbon stock. The results showed that the biomass carbon stock was 298.758 ± 9.4tc/ha for undisturbed natural forest and 199.895 ± 11tc/ha for disturbed coffee forest and the difference is statistically significant as p < 0.05. This revealed that the disturbance of this natural forest ecosystem, which is associated with the conversion of natural forest to the coffee cultivation area, resulted in the loss of 33.09% of the biomass carbon stock. The SOC is 148.40 ± 12tc/ha for undisturbed forest and 153.80 ± 4.30tc/ha for disturbed coffee forest has no significant difference as p > 0.05. Therefore, maintaining the biomass carbon sequestration potential of this natural forest ecosystem should be required through the implementation of different conservation mechanisms.
Abstract: The important climate-related functions of forest ecosystems are carbon sequestration, regulating the global carbon cycle and climate change mitigation. About 80% of the terrestrial carbon is stored as forest biomass and soil organic carbon. Deforestation and forest degradation show an alarming high, mainly due to the conversion of natural forest t...
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