Physical maturity was reached at between 14 and 17 yr of age, apparently a few years after attainment of sexual maturity. Maximum lengths and weights of about 268 cm and see more 240 kg were attained. Females appear to lose all their spots by 30 yr, although males may retain some spotting throughout life. Calving occurred throughout the year, with a broad peak from March to June. Of 60 females monitored at sea for >14 yr of the study, none were documented to have more than three calves, suggestive of low reproductive output or low calf survival. “
“The gray whale (Eschrichtius robustus) is a coastal species whose nearshore summer foraging grounds off the coast of British Columbia
offer an opportunity to study the fine
scale foraging response of baleen whales. We explore the relationship between prey density and gray whale foraging starting with regional scale (10 km) assessments of whale density (per square kilometer) and foraging effort as a response to regional mysid density (per cubic meter), between 2006 and 2007. In addition we measure prey density at a local scale (100 m), while following foraging whales during focal surveys. We found regional mysid density had a significant positive relationship with both gray whale density and foraging effort. We identify a threshold response to regional mysid density for both whale density and foraging effort. In 2008 the lowest average local prey density measured beside a foraging whale was 2,300 mysids/m3. This level was maintained even when regional prey Akt inhibitor density was found to be substantially lower. Similar to other baleen whales, the foraging behavior of gray whales suggests a threshold response to prey density and a complex appreciation of prey availability across fine scales. “
“The conditioning of dolphins to human-interaction behaviors has been documented in several areas worldwide. However, the metrics used to report human-interaction behaviors vary among studies, making comparison across study areas difficult. The purpose of this study was to develop standard metrics for reporting human-interaction Celastrol behaviors and utilize these metrics
to quantify the prevalence of human-interaction behaviors by common bottlenose dolphins (Tursiops truncatus) near Savannah, Georgia. The four metrics used were percentage of days with human-interaction behaviors, percentage of sightings with human-interaction behaviors, percentage of the catalog that interacted with humans, and spatial extent of human-interaction behaviors. Human-interaction behaviors were observed on 69.6% of days and 23.5% of sightings near Savannah. In addition, 20.1% of the animals in the catalog were observed interacting with humans. These rates are much higher than those found in other areas with known issues with human-interaction behaviors. These behaviors were observed across an area of 272.6 km2, which is larger than other reported areas.
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