2,957 research outputs found
Karpkala Cyprinus carpio L. ootsüütide küpsemise morfoloogia ja kronoloogia
No full texthttps://www.ester.ee/record=b5497822*es
Costa Rica
No full textTÜ Botaanika ja Ökoloogia Instituudi ekspeditsioon Costa Ricasse 4-14.02.2003. Valminud aastal 2004. Kaamera: Toomas Saat. Idee ja tekst: Ülle Reier. Montaaz: Paul Vesik. Toomas Saa
Resource management and the effects of trade on vulnerable places and people : lessons from six case studies
No full textLessons from six case studies illustrate the complex relationships between international trade, vulnerable ecologies and the poor. The studies, taken from Africa, Asia and Latin America and conducted by local researchers, are set in places where the poor live in close proximity to ecologies that are important to global conservation efforts, and focus on the cascading consequences of trade policy for local livelihoods and environmental services. Collectively, the studies show how under-valued common resources are often poorly protected and consequently subject to shifting economic incentives, including those that arise from trade. The studies provide examples where trade works to accelerate the use of natural resources and to exacerbate unsustainable dependencies by the poor, and other examples where trade has the opposite effect. An important conclusion is that local livelihood and technology choices have important consequences for how environmental resources are used and should be taken into account when designing policies to safeguard fragile ecologies.Environmental Economics&Policies,Economic Theory&Research,Emerging Markets,Labor Policies,Population Policies
Jesus, The Prophet, The Messiah, And The Host: An Interpretation Of Luke 24:13-35
No full textThe story of Jesus’ encounter with two disciples on the journey to Emmaus is a unique story, among which is the story contains the question: what really made two disciples not recognize Jesus?, and why after inviting Jesus to their home, the identity of Jesus was recognized. Many solutions have been offered to answer these complicated problems, but it seems that the answers proffered are less than convincing. According to the author, the Emmaus story must be seen from the entire book of Luke and Acts because in this episode there are important themes scattered throughout Luke’s two writings. The two disciples are representatives of Jews who cannot understand that the Messiah must suffer, be crucified, and be resurrected. What made them recognize Jesus again was when Jesus entertained them to eat? It was because it reminded them of a similar event before Jesus’ death and at the same time referred to the role of Yahweh as the host of His OT people and the hope of an eschatological meal. In the end, the theme of this dining table fellowship became important in the Acts of the Apostles in relation to Jewish and Gentile relations within the early church.
Keywords: Emmaus, Motif of Ignorance, Table Fellowship, Rejected Messia
Potentsiaalsed eutrofeerumise indikaatorliigid Läänemere põhjaosa suvises fütoplanktonis
No full textLitofiilsete rändkalade liikumismustrid avatud ja tõkestatud jõgedes
No full textVäitekirja elektrooniline versioon ei sisalda publikatsiooneLuureagendid kalade seas pole ulme, vaid kõnekeelne reaalsus. Esmakordselt Eestis varustati akustiliste märgistega erinevaid luukalu, nö klassikalisi kalu, kes seejärel looduslikesse veekogudesse vabastati. Need „luureagendid“ jätkasid oma tavapäraseid toiminguid, andes aimu nendega koos liikuvate suuremate kalaparvede käitumisest. Lõhe noorjärgud laskusid Purtse jões hüdroelektrijaama läbides merre; vimmad siirdusid enne merreminekut oma koelmutele Pärnu jões; kaitsealused tõugjad jätkasid elu avaras Peipsi-Emajõe-Võrtsjärve süsteemis, leides seal enesele sobivad kudemis-, toitumis- ja talvitumisalad.
Ilmnes, et rändeteede avatuna hoidmine on kaladele eluliselt oluline, kuid vahel ka surmav. Turbiinikanalit rändeteena kasutanud noorlõhedest hukkus erakordselt kõrge hulk - 36%. Seevastu alternatiivsel rändeteel looduslähedase kalapääsu näol ei hukkunud ühtegi laskujat, mis kokkuvõttes viis hukkunute osakaalu kõigist laskujatest 9%-le. Leiti, et tihedamate kalatõkkevõrede kasutamine lõhejõgedel on hädavajalik (nüüdsest kohustuslik). Ka mujal käitusid kalad avatud rändeteede tingimustes mitmekesiselt – üle Sindi paisu ülesvoolu tõstetud vimmad võtsid kasutusele kärestikud, millele ligipääsu pais seni piiras. Mitmed vimmad rändasid kaugele ülesvoolu, teised isendid liikusid lähemate kudealade vahel. Tõugjad külastasid aasta jooksul erinevaid jõgesid ja järvi, kusjuures elupaigakasutus oli kaladel aastati sarnane. Elupaigakasutuses (sh koelmute asukohas) ja rännete ajastuses oli mõndagi üllatavat. Näiteks oli eripärane tõugjate rutakus juba suvel järvest tagasi jõgedesse siirduda, samuti nende tendents madalatel temperatuuridel kudeda ja kõigil kuudel ööpäeva lõikes rütmiliselt käituda.
Kokkuvõtvalt leiti, et kalade asurkondadele ja elupaikadele tuleb läheneda individuaalselt, sest kalade käitumine võib veekogude lõikes varieeruda. Nii saab koguda asjakohaseimat infot ja valida parima strateegia kalade kaitsel ja majandamisel. Seega, „luureagentide värbamine“ osutus väga tõhusaks ning seda on soovitatav kasutada edaspidigi.Spies among fish is real science, not fiction. For the first time in Estonia, bony fishes (so-called classic fish) were tagged with individual acoustic transmitters and released into natural waterbodies. These “spy agents” continued their normal activities, giving us insight into larger schools moving with them. More precisely, salmon juveniles descended towards the sea through a hydroelectric plant on the Purtse River; vimba bream moved to their spawning grounds in the Pärnu River and to the sea thereafter; protected asp continued moving between spawning, feeding and wintering areas in a large Peipsi-Emajõgi-Võrtsjärv lake-river system.
After following the fish and analysing the big database, it turned out that keeping migratory routes open is vital, but sometimes deadly also. An exceptionally high proportion of juvenile salmon - 36% - died while using the turbine channel as a migration route. Luckily, a nature-like fishway was also available for fish that caused no mortality. Thus, the overall mortality for the whole descending salmon juveniles was 9%. The use of narrower bar racks on salmon rivers was found to be essential (for now mandatory). Elsewhere, fish also behaved diversely while the movement routes were opened. Several vimba bream individuals migrated far upstream, others changed their location between nearby spawning grounds. Asp utilised different rivers and lakes during a single year but with a tendency to repeat habitat use patterns between years. Surprising for asp was the location of several key-habitats and migration timing between them. The presence of continuous rhythms during all months was also unexpected. These are only a few examples of the fascinating results found in these studies.
In conclusion, it was found that fish populations and habitats need to be approached on an individual level, as fish behaviour may vary across waterbodies. In this way, the most relevant information can be gathered and the best strategy for the protection and management for fish can be chosen. The “recruitment of spies" proved to be very effective and their continued use is recommended
Ootsüüdi küpsemine ja ovulatsioon kaladel. Ahvena Perca fluviatilis (L.) ovulatsioon ning marjalindi moodustumine.
No full textMerisiig Eesti rannikumeres: vormid, kasv, toitumine, viljakus
No full texthttps://www.ester.ee/record=b3596029*es
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