Download presentation
Presentation is loading. Please wait.
Published byAbner Kelley Modified over 9 years ago
1
Marine Mammal Issues in the GOA: IERP considerations Kate M. Wynne UAF School of Fisheries and Ocean Sciences Sea Grant Marine Advisory Program Kodiak, Alaska
2
Diverse Taxa Pinnipeds Sea Otters Whales Baleen Toothed
3
Photo by Kathy Hough Diverse Habitats
4
Diverse Foraging Strategies
5
Diverse Life Histories and Strategies K-selected Homeotherms Air-breathers HIGH energetic demands High Latitude Marine
6
Seasonal Migration and Fasting North Pacific Humpback Whales – SPLASH 2004
7
Maternal Investment variable energy storage capacity Insulation
8
b. TIMING of prey availability is CRITICAL and VARIABLE Bottomline #1 a. They are all here for the FOOD
9
Bottomline #2 b. Effects of change a. They are significant consumers throughout the GOA
10
Diverse Issues and Questions Bottomline #3 Diverse Habitats Diverse Life Histories Diverse Prey and Foraging
11
Some Recovering and/or Increasing Effects of change ?
12
Others Not Recovering and/or In Decline Many Unknown
13
Differential Population Trajectories Within species across GOA Between sympatric species
14
Changes in Reproductive Patterns Timing of harbor seal pupping Prolonged dependency of SSL pups ? Changes in Distribution Reflection of population status ? Change in prey abundance ? Temporal and spatial distribution ? Oceanographic anomolies ?
15
Kodiak Gray Whale Distribution 1999-2003 Is this an indicator of change Gray whale population? Climate? Arctic productivity? Year-round grays feeding in Kodiak
16
Why ? Different processes at play ? Diverse Habitats Diverse Life Histories Diverse Prey and Foraging
17
Mary Crivello photo
18
Top Down Predation Disease or Parasites Anthropogenic Harvest, predator control, whaling Bycatch Contaminants : long-lived lipophiles Direct effects on population structure Residual effects on trophic structure
19
Bottom Up Oceanographic / climate features and change ? Inter- or intraspecific competition ? Anything that affects prey * availability at critical times ( * Zooplankton, bivalves, cephalopods, fish…….)
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.