No abstract

Naturally spawned egg strands of perch, PercaJluviatilis L. were sampled from exposed fir trees submerged in Lake Plufisee, Holstein, Northern Germany from April to May 1989. These were incubated in sifu and in the laboratory to estimate the viability, development and abnormalities of the embryos. From the in siru incubated eggs 91.6% embryos were viable, the nonviable portion comprising 1.1 % unfertilized eggs, 5.1 % dead and 2.2 % with abnormalities. As compared to the eggs incubated in the laboratory with 84.1 % viable embryos, the nonviable portion consisting 1.1 % unfertilized eggs, 11.3 % dead and 3.5 % with abnormalities. Incubation rate of P. fluviatilis embryos both in situ and laboratory, ranged from 200-210 ATUs (10 "C in situ and 8 O C in the laboratory) with incubation period of 20-27 days from fertilization to 50 % hatching.

Managed retreat has become a recommended adaptation strategy for hazard-prone coastal cities. The study aimed to improve considerations for the contextual factors that influence the success of managed retreat and resettlement projects in Metro Manila. Data were collected through a mixed-method approach consisting of a screening of relevant literature, a qualitative case analysis of resettlement projects, and a workshop series with Philippine stakeholders. It turned out that the resettlement of informal settlers is a central element of urban development. Though in-city resettlement is preferred, the majority of existing and planned projects are developed in off-city locations. The findings present a nuanced view of different retreat approaches. Not all in-city resettlements are successful, and the unpopular off-city projects have a potentially important role for urban and regional development. A strategic planning thread to develop concepts for qualitative off-city settlements that counteract uncontrolled urban sprawl with monofunctional residential areas for urban poor people was deduced. The other thread asks for pathways for inner-city development with innovative, vertical, in-city projects. A final observation was that climate change and the COVID-19 pandemic are worsening the situation in informal settlements, thus strengthening the argument for the planned decentralization of Metro Manila’s congested urban areas.

Manila is a primate city with national and international significance. Unlike any other city in the Philippines, Manila has the mandate of serving not just its local constituents, but also a clientele of national and even global scale. Recognizing that the localization of Sustainable Development Goals (SDGs) at sub-national levels is a key element in meeting the targets by 2030, it is important to look at how cities have been confronting local challenges relating to the development goals. Focusing on SDGs 3, 4 and 11, this city profile shows that Manila has performed reasonably well against key national and regional benchmarks on health, education and urban sustainability. However, as the city continues to lag behind many of its regional counterparts, key reforms must be undertaken in the areas of local policymaking, targeting of resources, scale of public participation and engagement of national government agencies. Heading into the first four years of the SDGs, the aim of this profile is to recognize and contextualize Manila’s existing urban conditions, best practices and pressing challenges—which would all have a significant implication on how Manila stands to attain SDGs 3, 4 and 11.