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Although we know a great deal about many of the pinnipeds, because they are more easily observed on land and more easily handled for sampling, we know very little about most cetaceans. Those species that occur near shore and are easily caught and tagged (e.g. bottlenose dolphin) have been reasonably well studied. The ecology of large whales and pelagic dolphins has only recently been studied with any rigor, because of the use of new techniques for marking (e.g. VHF and satellite tagging), biopsy sampling (to determine sex, pollutant levels, genetic relationships), and photo-identification of individuals (e.g. Calambokidis et al. 1990, Ford et al. 1994). We know very little about which habitats are most critical for the survival of cetaceans. We recognize that pinnipeds require some terrestrial locations for rest and reproduction, but the aquatic areas needed for feeding are only now being determined.

One of the most important process-based ecological questions that needs study is the relationship between the prey resources and the marine mammal populations. Many of the species using the MBNMS are here because of the prey resources. We need to understand what constitutes sufficient prey resources in temporal and spatial scales, and understand how changes in prey resources affect marine mammal populations. These findings should be incorporated into fisheries management decisions when fishery quotas are being determined.

We know very little about the marine mammal ecology at the northern and southern borders of the MBNMS, primarily because it is some distance from the ports and research institutes that border Monterey Bay. More effort should be extended offshore and at the edges of the MBNMS.

Acoustic studies of marine mammal vocalizations may be greatly enhanced by access to continuous sound recordings from fixed acoustic arrays, such as those recently declassified by the military.

The recent ATOC controversy (Acoustic Thermometry of Ocean Climate, see ARPA/NOAA 1995) has heightened our concerns regarding the effects of sound on marine organisms, especially species that use sound for navigation, communication, and localizing prey (e.g. cetaceans). One of the most understudied pollutant is noise, and its effects may be more far ranging than we realize. The main purpose the ATOC project, i.e to measure ocean warming as an indicator of global warming, should be addressed in marine mammal research as well.Long-term changes in population distribution and abundance may provide strong indicators of ocean climate change via impacts to prey or other resources.


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Section V. Human Impacts
 
URL: http://montereybay.noaa.gov/sitechar/mamm6.html    Reviewed: March 05, 2014
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