#Lake lanao freshwater fish free#

(2) Three specific morphofunctional characteristics (volume, surface area, and S:V ratio) are not related to CV or skew, but two general morphofunctional characteristics (morphotype and taxonomic affinity) are related to CV and skew. This indicates that rate species are as likely to have an opportunistic strategy as common species. (1) The mean abundance of a species is not statistically related to the CV or skew of its frequency distribution. The results of the analysis on the 3 sets of variables are as follows.

Niche descriptors are variables which give the average position of a species on an environmental gradient when net growth of the species is positive. Relationships are tested between CV or skew and three sets of variables: (1) mean abundance measured as biomass or numbers, (2) morphofunctional properties such as size and surface: volume ratio, and (3) niche descriptors. High CV and skew are interpreted as evidence of an opportunistic demographic strategy and low CV and skew as evidence of conservative strategy. CV (the coefficient of variation) and skew are highly correlated for the 31 species and vary over approximately an order of magnitude between species.

The shapes of the distributions are quantified in terms of the coefficient of variation and a skew statistic. All of the distributions have a positive skew. The looming climate change, which may undoubtedly lead to further loss of biodiversity services, needs to be incorporated in the watershedĪbundance-frequency distributions for 31 phytoplankton species form Lake Lanao, Philippines, are constructed on the basis of 65 weekly samples. Hence, apart from biodiversity conservation in the lake watershed, the flux of nutrients and pollutants should be a top priority of an ecosystem-based management that needs to employ innovative socio-environmental approaches involving participatory, multisectoral, multidisciplinary, integrated and comanagement efforts. Zooplankton species-dominated state with anthropogenic input as the possible main driver. Recent water quality analyses in 20 indicate a eutrophic, coliform-contaminated, and invasive Analysis of nutrient levels when the lake was at its relatively pristine state indicated a high sensitivity to levels of dissolved nitrogen with a pelagic ecosystem that is bottom-up or resource controlled. Rich indigenous community of fish species was first described in 1924, the lake’s fisheries ecosystem has undergone a regime shift featuring the dominance of invasive fish species and the catastrophic disappearance of 16 endemic cyprinid species. Within a span of about 75 years or less since a Major rivers and numerous intermittent tributaries that sustain lake water are unstudied. Nearly 90% of the alienable and disposable lands including most of the lake shoreline and the adjacent lowland forest areas have now yielded to agriculture (87%), but only 0.4% to urban and rural settlements. The terrestrial portion of the watershed is relatively rich in flora and fauna that mostly inhabit the remaining intact forests which provides 60% cover, but a thorough species inventory is wanting.

#Lake lanao freshwater fish free#

Feel free to send corrections to me.The sparse body of information on the ecology and biodiversity of one of the world’s ancient lakes, Lake Lanao, was reviewed to arrive at objective insights that may be useful for an ecosystem-based management of the Lake Lanao Watershed.

Therefore some information such as scientific names may be out of date. What's new | tropical fish home | rainforests | news | search | about | contactĬopyright 1994-2013 | Tropical Freshwater Fish | Biotope aquaria | Country Index | Index of EcosystemsĪll Content Below is Copyright To return to mongabay use one of the following links: Freshwater Fish Species in Lake Lanao The tables below were generated from - A project to provide indexing and links for all known species as the baseline dataset for studies of global biodiversity.Īll links below take you to pages on the site.