The status and life history traits of endemic, native and introduced species in Lake Lanao, Philippines Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/f4752m06v

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  • The endemic cyprinids of Lake Lanao, Philippines have been described as a species flock and are thought to be an example of explosive evolution. However, based on historical surveys, 16 of the 18 cyprinid species endemic to Lake Lanao are now believed to be extinct. Furthermore, non-native species have been introduced in Lake Lanao and some have proliferated. Three of the world‟s one hundred worst invasive species are currently found in the Lake. This study focused on the status of the fish species in Lake Lanao and examined six life history traits thought to be associated with invasiveness. In Chapter 2, results of landing and market surveys conducted from July to October 2008 were compared with similar information from historical surveys. Field sampling and fishermen interview were also conducted to collect additional information on the status of fish species in Lake Lanao. The survey recorded a total of two endemic, one native and ten introduced species. Although the endemic Puntius lindog used to be the most important fish in the lake in terms of fishery landings, it only comprised 0.01% of the total weight of the fish species surveyed during 2008. The introduced Hypseleotris agilis have proliferated in the lake, comprising 66.6% of the total weight of fish caught. Chapter 3 examines six life history traits of the endemic, native and introduced species found in the 2008 survey and of three other species reported in previous surveys. A comparative analysis showed that most of the introduced species in Lake Lanao have the characteristics generally related to invasion success. However, not all of the introduced species were successful. The analysis showed that the six life history traits are not entirely successful at predicting invasiveness in Lake Lanao. The discovery by the field study that two endemic cyprinids remain in Lake Lanao was surprising and significant as the Lake during the past few decades has been imperiled by human disturbances, exploitation and introduced species. The thesis focused on the role of introduced species on the demise of the endemic species. Other factors also need to be investigated. Protecting and conserving the endemic species are highly recommended.
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