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Biodiversity in the Kuroshio Region: Challenges and Trends in the Upstream

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Biodiversity in the Kuroshio Region: Challenges and Trends in the Upstream Kuroshio Science 9-1, 45-56, 2015 Biodiversity in the Kuroshio Region: Challenges and Trends in the Upstream Kristian Q. Aldea1, Minerva I. Morales2, Aurora E. Araojo2, Jimmy T. Masagca2 1 Catanduanes State University (Panganiban Campus), Panganiban, Catanduanes, Philippines 2 Catanduanes State University (Virac, Campus), Virac, Catanduanes, Philippines Abstract Biodiversity is one of the important tools to consider the richness of natural resources. Unfortunately many of the world’s mega diverse areas are experiencing biodiversity loss due to natural and anthropogenic influences. The Kuroshio Region has not escaped from this global phenomenon. Catanduanes Island, which is located at the forefront of Kuroshio Current faces species decline for the past years due to overexploitation accompanied by limited initiatives and directive guidelines. Many species are already threatened in this island from smaller siganid fish to large fishes and birds. The case of marine gastropod for example is biodiversity declining from the last 10 years. Although some gastropod studies in the past have shown a high species richness, a decline is noted in 2013 gastropod diversity at H’= 2.969, a 0.453 lower than 2003 study at H’= 3.422 while it is becoming uneven at J’= 0.88 compared from 2003 study at J’= 0.93. Conservation efforts have started in the island which includes establishments of marine protected areas and forests management plan. More wildlife protection program may be established in the island and rehabilitations of the degraded areas may be closely monitored. Fishing ordinance and regulations in over collection/overfishing is likewise recommended. Keywords: Upstream, Catanduanes Island, biodiversity, exploitation, biodiversity hotspot, endemism 1. Introduction from tropical Philippines, to subtropical Taiwan and finally to temperate Japan. That Philippine geographical location Several geographical areas are known to harbor complex contributed variety and abundance to Kuroshio’ s species number of wildlife and higher degree of endemism. Recently, stocks. Its tropical setting is an advantage to the region’ s ecologists have identified these places as mega diverse biodiversity establishment as most ranges of species are (countries/regions) where most of the earth’s species are more scattered in warm climate and just secondarily disperse to concentrated if combined altogether. However, many of these temperate zone through migration. But these bounties have species centers are becoming widely known as biodiversity changed and still bound to continue as this Kuroshio’s front hotspot. This means that many of its organisms are on their liner is labeled a biodiversity hotspot (Myers et al., 2000). ways to being endangered and many more are becoming Human induced activities such as overfishing and coastal susceptible to brink of extinction while some people across forests clearings continue which may have been rendering their surroundings unaware of their battling existence. poor reproduction and development of marine life. Biodiversity as described by Khrone (2012) which includes An organism never lives alone nor an ecological process species diversity, genetic variation and diversity of ecological executed isolated from other environmental phenomena. This interactions is not a constant figure which may immediately generally accepted norm scaffolds the fact that Biodiversity in fluctuate as more disruptions dominate in a certain time and space. the Kuroshio Region is a shared responsibility among the The Philippines which is also known as a mega diverse states on its borders. Now, many would ask why a term country radiated its species richness in the Kuroshio Region, a upstream is given in one of its portions. What could be its coastal region which is fed by the Kuroshio Current that starts significance? Well, as Kazuo Okuda (2009) remarked, “The e-mail: [email protected] [email protected] [email protected] [email protected] 45 Biodiversity in the Kuroshio Region: Challenges and Trends in the Upstream Philippines is like an upstream of the Kuroshio” and noted that evidently shown by their displayed shell in some coastal whatever occurs in its place will inevitably spread villages’ dwellings. Other pelagic fishes such as sailfish, downstream. In connection, Catanduanes Island in the dolphin fish, shark, sardine and flying fish and many forms of Philippines’ Bicol Region is one of the “Kuroshio’ s coral reef and littoral fish such as rabbitfish, humphead wrasse upstreams” as it is located at the forefront of the current’s and parrotfish flourish in its waters. Coral reefs embrace the origin; its marine species are shaped with the Kuroshio coasts and its several islets. Other kinds of mollusks also exist Current and many are destined to follow the current’s flow in and are used as additional food stocks especially in remote their migration and breeding. Biodiversity of the Catanduanes coastal towns. Mollusks diversity has been described by Island is therefore an integral part of the Kuroshio, hence this Masagca et al., (2010) which reported higher diversity of study has been conducted. mollusks in the island. The island boosts biodiversity of marine flora as well. 2.0.Catanduanes Island Features and Marine Green algae such as the edible Caulerpa densely grow Biodiversity especially in eastern coasts where greater turbulence of Kuroshio Current brushes on its shores. Brown and red algae One of the biodiversity rich Philippine provinces is the although least studied on its waters are usually seen in the island of Catanduanes secluded in the Pacific where typhoons island’s reefs and sub littoral regions where depths gradually closely develop. It is a triangular island at the eastern seaboard subdue to continental shelf. Noteworthy to include are the of the Philippines and the first landmass of greater Luzon that extensive mangrove forests which covers many of the island’s touches the Pacific Ocean at 13. 5 to 14. 1 degrees North muddy and sandy coastal substrata (Masagca et al., 2010). Latitude and extends from 124. 0 to 124. 5 degrees East These forests are important refuge of the islands estuarine and Longitude (DENR-Catanduanes, 2009b). The island is a part juvenile marine species which may eventually migrate to the of Bicol Region; the 12th largest island of the Philippines with sea when already grown up. Additionally, an assessment of a 1,511.5 km2 (Department of Science and Technology DOST, Catanduanes marine protected area in Agoho, identified 7 2010) which is separated from the Bicol peninsula by the species of seagrass and 10 species of seaweeds with the Maqueda Channel and Lagonoy Gulf. In 2010 census, it is highest in terms of diversity in the number in all sanctuaries of already home to 246, 300 human population (NSO, 2013) the Bicol Region (Soliman, as cited by Vargas & Asetre, which generally inhabit its coastal boundaries. 2011). Likewise, the highest mean chlorophyllαconcentration in the eastern seaboard of the Philippines is found in Catanduanes Island and Samar at 0.47 g/L (Viron, 2006). Fig.1. Catanduanes Map. Photo by http:// insights.looloo.com Fig.2. Cypselurus sp. Swainson, 1838. Catanduanes nestles on the latitude where final waves of Photo by http://www.livt.net North Equatorial Current encounter terrestrial soils for the first time and merge on the waters northwestward and becomes the Kuroshio Current. This location stimulates biological mechanism to many forms of marine fauna in this part of the ocean. Some fishes such as tuna for example follow a path of migration (Catanduanes Tuna Highway) that runs from Southern Philippines which pass through Maqueda Channel and continues to Northern Philippines, Taiwan and Japan drifting with the Kuroshio Current. Pacific squids and octopuses’ species are known to frequent on Catanduanes Fig.3. Sardinella sp. Cuvier, 1829. Coasts. Nautiluses and sea turtles are also present in the island Photo by http://www.cntresources.com.my 46 Kristian Q. Aldea, Minerva I. Morales, Aurora E. Araojo, Jimmy T. Masagca 2.1.The Island’s Exploitation of Marine Biodiversity system may associate to the loss of one another. Catanduanes Island has one of the two clumps of Environmental effort is still limited when it comes to rainforests remained in the Bicol region (Fragada, as cited by restrictions or total prohibition of juvenile fish excessive Arguelles, 2011) and shows high degree of endemism with fishing. Rabbitfish (Siganidae) is one of the most bountiful these bastion of endemic wildlife: Catanduanes bleeding heart fish in the island but also one of the heavily exploited fishes pigeon, Catanduanes narrow mouthed frog, Bicol skink, which fishing peaks from March to June. Hundreds of sacks of trumpet snail, Philippine deer and macaque, cobra, cloud rat, this fish are harvested in coastal areas all over the island in giant bats, giant lizards, wild pig, rare birds and invertebrates. each breeding season. Soliman et al. (2009) indicated that The island is also home to the critically endangered Philippine Siganid overfishing is a serious problem in Lagonoy Gulf cockatoo (Birdlife International, 2014). Although Catanduanes which is a maritime part of Southern Catanduanes, although terrestrial biodiversity is still considered least disturbed most coastal part of the island has been heavily fishing it as compared to other Philippine Provinces, environmental well. disturbance has been accelerated for the last few years. Forest On the other hand, although dynamite fishing has
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