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Population growth rate, abundance and distribution of marine mammals

Population growth rate, abundance and distribution of marine mammals.

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Population growth rate, abundance and distribution of marine mammals

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  1. Population growth rate, abundance and distribution of marine mammals Population growth rate. Population growth rate should be positive until hampered by natural limitations. Deviations during the phase of exponential increase are indicative of that the population is reaching its carrying capacity or is affected by human impacts. Near the carrying capacity, the population fluctuates but a continuous decline indicates that the population is not in good environmental status (GES). Abundance. Population abundances of the marine mammals are informative indicators of the state of the populations. Distribution. The abundance of populations in different parts of the Baltic Sea gives an indication of the distribution of the population.

  2. Population growth rate, abundance and distribution of marine mammals Legislative linkage:

  3. Population growth rate, abundance and distribution of marine mammals Example Fill in for current situation (action level = who needs to complete the task)

  4. Population growth rate, abundance and distribution of marine mammals • GES: At the moment all the populations are assessed against their intrinsic growth rate during exponential growth: • Grey seals and ringed seals: 10 % intrinsic growth rate. • Harbour seals: 12 % intrinsic growth rate. • Harbour porpoise: 4 % intrinsic growth rate. • At Carrying capacity: No decline exceeding 5% over a period of six years • No decline in distribution Peopleinvolved: Tero Härkönen, Karin Hårding, Olle Karlsson, Anders Galatius, Markus Ahola.

  5. Population growth rate, abundance and distribution of marine mammals • HELCOM Assessment Unit Level: 1 • The indicator is applicable in:All of the Baltic for greyseals, the Bothnian Bay, the Gulf of Finland and the Estonian coastalwaters for ringedseals. Southern Baltic and the Kattegat for Harbourseals. • Currently data is available : Available for allsealspecies, butnot for harbourporpoises

  6. Population growth rate, abundance and distribution of marine mammals

  7. Population growth rate, abundance and distribution of marine mammals • Temporaltrends in weaningweights of greysealpups. • -Autumnweights of pups of the year in harbourseals FUTURE INDICATORS

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