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Assessment of Ecosystem Characteristics and Fishery Carbon Sink Potential of Qianxiahu Reservoir Based on Trophic Level and Carbon Content Methods
No full textOptimizing biological carbon sequestration has become a primary strategy in global lowcarbon-
emission initiatives. Freshwater fisheries in reservoirs play an important role in aquatic
biological carbon sequestration. However, a standard method for evaluating the carbon sink capacity
of inland fisheries has not been developed. Therefore, this study aimed to assess and compare the
carbon sequestration potential of the Qianxiahu Reservoir?s fisheries using the trophic level and
mass-balance methodologies. The Ecopath model was employed to determine the trophic levels
of aquatic organisms within the Qianxiahu Reservoir ecosystem, with input parameters sourced
from in situ surveys and the literature on reservoirs. The model includes 21 functional groups, with
trophic levels ranging from 1.000 to 3.281. The key species identified are silver carp, bighead carp,
and crucian carp. The indices of Finn?s cycling index (FCI), connectivity index (CI), system omnivory
index (SOI), and total primary production/total respiration (TPP/TR) for the Qianxiahu Reservoir
are 11.35, 0.27, 0.196, and 1.540, respectively. These values indicate a high degree of material recycling
and complex interconnections among functional groups. The fishery carbon sink potential of the
Qianxiahu Reservoir, calculated using the trophic level and carbon content methods, yielded values
of 261.8362 tons/km2 and 66.6818 tons/km2, respectively. The trophic level method showed a notable
increase of 195,1544 tons/km2 compared to the carbon content method, underscoring significant
differences in results between the two methods. The study concludes with recommendations for
research on methods to assess the carbon sink capacity of freshwater fisheries, aiming to establish a
scientific framework for this evaluation
Blueprint for Blue Carbon: Lessons from Seychelles for Small Island States
No full textBlue carbon has been proposed as a nature-based solution for climate change mitigation;
however, a limited number of published works and data and knowledge gaps hinder the development
of small island developing states? (SIDS) national blue carbon resources globally. This paper reviews
the blue carbon ecosystems of Seychelles as a case study in the context of SIDS, comparing estimations
by the Blue Carbon Lab and recent blue carbon (mangrove and seagrass) evaluations submitted to
the Seychelles national government. Mangroves (2195 ha, 80% in Aldabra Atoll) and seagrasses
(142,065 ha) dominate in Seychelles, with coral reefs having the potential for carbon sequestration
(169,000 ha). Seychelles is on track to protecting its blue carbon, but these systems are threatened
by rising sea levels, coastal squeeze, erosion, severe storms, and human activities. The importance
of carbon inventories, accounting institutions, and continuous monitoring of blue carbon systems
is discussed. Blue accounting is necessary for accurate accounting of carbon sequestration and
carbon storage, generating carbon credits, and representing impactful reductions in greenhouse
gases for NDCs. Challenges and opportunities include policy legislation regarding ownership
rights, accreditation and certification for carbon credits, sustainable financing mechanisms like
natural asset companies and blue tokens, local engagement for long-term success, and carbon
market dynamics following COP27. The restoration and regulation of blue carbon resources for
optimal ecosystem services delivery, carbon inventories, and blue carbon policy are recommended
development priorities. Blue carbon ecosystems have the potential to contribute to NDCs of SIDS
while simultaneously offering sustainable development pathways for local communities through the
multiple ecosystem services they provide
PARAMETER POPULASI IKAN PICKHANDLE BARRACUDA, Sphyraena jello Cuvier, 1829 DI PERAIRAN PANTAI DHOFAR, SELATAN OMAN
No full textANTIOXIDANT AND ANTIFUNGAL PROPERTIES OF Strobilanthes crispus LEAF EXTRACT AND ITS POTENTIAL AS AN ENRICHMENT IN CHITOSAN-BASED COATING FOR PRESERVATION OF TOMATO
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GLOBAL WARMING EFFECTS ON ECTOTHERM SPECIES
No full textIn light of ongoing climate change, it is increasingly important to know how
nutritional requirements of ectotherms are affected by changing temperatures.
Here, we analyse the wide thermal response of phosphorus (P) requirements
via elemental gross growth efficiencies of Carbon (C) and P, and the Threshold
Elemental Ratios in different aquatic invertebrate ectotherms: the freshwater
model species Daphnia magna, the marine copepod Acartia tonsa, the marine
heterotrophic dinoflagellate Oxyrrhis marina, and larvae of two populations of
the marine crab Carcinus maenas. We show that they all share a non-linear cubic
thermal response of nutrient requirements. Phosphorus requirements decrease
from low to intermediate temperatures, increase at higher temperatures and
decrease again when temperature is excessive. This common thermal response
of nutrient requirements is of great importance if we aim to understand or even
predict how ectotherm communities will react to global warming and nutrientdriven eutrophication
