Sentences with phrase «between whale populations»

«Our findings give us insights into how fidelity to breeding and feeding destinations persist over many generations, resulting in differences between whale populations, and why some populations are more genetically differentiated from the rest.

Not exact matches

Palumbi used two different types of gene in the sampled whale meat to derive his estimated pre-whaling population estimate of between 500,000 and one million.

The occasional genetic interchange between populations also seemed to correlate with feeding grounds with high densities of krill, places where whales from different populations are likely to move vast distances and come into contact with other populations.

They included perilous falls in the populations of several whales and porpoises, the dysfunctional relationship between the science community and the administration of President Donald Trump and continuing revelations of sexual harassment in science.

Seeking to establish links between populations of blue whales in the Gulf of Corcovado and other regions, the researchers examined DNA collected from the skin of blue whales with biopsy darts fired from crossbows across the eastern South Pacific.

The samples were then analyzed with a technique called polymerase chain reaction (PCR), used to amplify specific nuclear «microsatellites» for statistically measuring gene flow between the different populations and subpopulations located in the western South Atlantic (Breeding Stock A) and the eastern South Atlantic and Indian Ocean populations (Breeding Stocks B and C, and the Arabian Sea humpback whale population, respectively).

The authors point out that the findings support previous observations of individual male whales moving between populations in different ocean basins, and that subpopulations from both regions could share the same feeding ground in Antarctic waters.

Using data generated from more than 3,000 skin samples from individual whales ranging from the South Atlantic to the Indian Oceans, the research team has uncovered previously unknown degrees of relatedness between different whale populations.

In the largest study on the genetics of whale sharks conducted to date, researchers found that the world's biggest fish likely exist in 2 distinct populations with minimal connectivity between the Indo - Pacific and the Atlantic Ocean.

Stable isotope results show only very slight differences between ancient and modern whales, indicating the hypothesis of population substructure in the past around the area of the Olympic peninsula / Vancouver Island remains a possibility and warrants further investigation using larger sample sizes.

Of particular interest is the possibility of a large population decline prior to whaling, as such a decline could explain the ∼ 5-fold difference between genetic estimates of prior abundance and estimates based on historical records.

Eastern gray whales represent a useful case study for investigating historic population dynamics and in particular the discrepancy between genetic and historical data, because both genetic diversity and historical records have been examined in depth [5], [16], [17].

The nature of the relationship between gray whale populations and climate - sensitive ecosystem features such as sea ice, freshwater input to nearshore benthic ecosystems and benthic species composition is poorly understood [19], [20].

[19][20] Although identity between the Atlantic and Pacific populations can not be proven by anatomical data, its skeleton is distinctive and easy to distinguish from that of all other living whales.

«We have typically counted births and deaths to assess population status, but photogrammetry gives us a new tool to better assess the whales» condition between years and to look for changes over the course of the year,» said NOAA's Lynne Barre.

This whale population, hunted nearly to extinction generations ago, is slowly recovering, with an estimated 450 right whales dividing their time between winter calving areas off the southeastern United States and summer feeding grounds from New England north.

The baleen whales were hunted to near extinction before the mid-20th century, and their populations have not recovered to anywhere near historic levels yet, so I have trouble seeing a link between plankton depletion and whales.

Newly available shipping lanes through the Northwest Passage would greatly shorten the trip between Europe and East Asia, but would likely cross the migratory route of any right whales that occupy the region.It's vital that we know about right whales in this area in order to effectively avoid ship strikes on what could be a quite fragile population.