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Archive for the ‘RK13’ Category

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PC: G. Langley

The numbers are in.

Last week, a couple days after weaning, PK1 was flipper-tagged. He is now known as RL08. His left flipper tag reads L08, and his right reads L09.

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PC: G. Langley

At the same time he was tagged, RL08 also received his initial vaccination to protect against morbillivirus. (Click here to learn more about the Hawaiian monk seal vaccination program.)

Too, Kauai’s newest weaner was measured—both in length and girth. As suspected, RL08 set some recent records.

The hefty weaner measured 145 centimeters in length—from the tip of his nose to the tip of his tail. His girth—the widest part of his body just below his fore flippers—rolled in at a ridiculous 143 centimeters. Basically, he’s almost as big around as he is long.

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PC: G. Langley

But how do those numbers compare?

For a variety of reasons, not all weaners get measured. However, the average length of 14 weaners (not including RL08) over the past six years, equaled 130.5 centimeters. The average girth of those same 14 weaners equaled 114.85 centimeters.

Let me repeat: RL08’s length came in at 145 centimeters and his girth at 143 centimeters.

He’s a big boy.

Based on the photos (thanks again, Gary), we knew that, right?

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PC: G. Langley

In some other good news, RK13’s pup from last year—RK42, who was last sighted the day she had a fishing hook removed from mouth on July 28—popped up last week on the southeast side of the island look quite healthy herself. What a relief.

RK42 proves that bigger doesn’t always equate to weaner survival. She was a fairly small weaner, measuring 126 centimeters in length and 100 centimeters around her girth when she was tagged last year. Go RK42!

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Just two days shy of eight weeks after giving birth, RB00 finally weaned her pup, PK1.

RB00 nursed for a grand total of 54 days. That’s the longest stretch of nursing days for a Kauai pup going back to and including data on pups since 2012. The previous record was 51 days set in 2017 by RK30, a well-known (and well-storied) mom. Her pup was RJ36. The year prior, in 2016, RK30 nursed her pup (RH38) for a total of 50 days.

The average number of nursing days for Kauai moms since 2012 is 42 days. Last year, RK30 nursed for 49 days while both RK28 and RO28 nursed their pups for 39 days each.

The shortest number of nursing days occurred in 2012 when RK13 weaned RL10 after 32 days. During her pregnancy, RK13 experienced two injuries consistent with shark bites that left her in smaller condition than her usual pregnancy weight.

Here are some of the very last photos of PK1 with RB00 and also a few from his first day on his own. Watch for one photo in particular that illustrates clearly why some people theorize that the moniker “monk” for these seals harken to the kind of hood some religious monks wear as part of their habit.

As always, thanks to Gary Langley for so generously sharing his photographs.

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Field Report: November

Monthly Update: The Kauai team reported 28 individually identified seals in November for a grand total of 145 seal sightings reported to the hotline.

November: 145
October: 203
September: 199
August: 295
July: 414
June: 315
May: 332
April: 302
March: 299

New:

  • Juvenile female R7AA was disturbed by a leashed barking dog at Salt Pond Beach Park and left the area.
  • A seal was harassed at Mahaulepu by group of men making noises at it to elicit a response. They were also playing football very near the seal. The seal left the beach due to the disturbance; however, hauled out again later after the men were gone. The disturbance was witnessed and reported by a member of the public.

Updates:

  • Update: RK58 remains at Ke Kai Ola for rehabilitation. RK58 is now free feeding and gaining weight.
  • Sub-adult male NG00 hauled out at Poipu with the circle hook still in his lip. The original hooking occurred in Sept of 2017. The seal is in excellent body condition, but had just finished molting and was therefore not captured for de-hooking.
  • Poipu Keiki Pool: RK13 was displaced this month. That was her fourth displacement in 2 years. (Remember, this only happens with NOAA approval and by trained individuals.)
  • Bleach markings: 4 bleach marks were applied.
  • Molting: 2 seals molted this month.

Research/Support of PIFSC:

  • Sub-sampled scat, molt, and tissue plug samples accordingly.
  • Logged all seal sightings for PIFSC database. Organized photos and reported sightings, molt tallies, survival factors to send to PIFSC.

 

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As you may recall, the first Kauai pup was born on April 20, 2018 at Maha’ulepu to RK13. While this pup was with her mother she was known as PK1 (Pup Kauai #1), and then after 37 days of nursing, her mother weaned her, and we briefly captured and flipper tagged her. This process usually takes less than five minutes and includes a brief restraint while plastic flipper tags are applied in the webbing of the rear flippers. Her tags read K42 and K43, making her official ID RK42. The R indicates that she is part of the Main Hawaiian Island population and the K indicates she was born in 2018, and finally the 42 is her unique ID. During the tagging process her length and girth were also measured, a microchip was injected under her skin, and she was given her first vaccination against a virus in the measles family known as morbillivirus, also known as distemper in other species. You can learn more about this virus and the monk seal vaccination program here.

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As previously reported, RK42 became entangled in hook and line fishing gear on July 28th, which left a large fish hook in her mouth. The Kauai team quickly responded and captured her on the beach and removed the hook. The hook was a rather large barbed J-hook that was somewhat difficult to remove, primarily due to the sharp barb which caused some tissue damage in her mouth and mild bleeding. She spent the rest of that day resting normally at Maha’ulepu, but has not been seen since.

It is not uncommon for young seals to find a quiet out of the way places to haul-out, so we hope that is the case. In fact, it’s happened before. In June 2009, R5AY gave birth on a North Shore Kaua`i​ beach to a female pup who was eventually tagged RA20. After weaning, as RA20 started to explore, she all but disappeared. Time between sightings would stretch into months and years. Then, surprising everyone, she started popping up on Maui and Hawai`i Island beaches. In 2017, she gave birth to her first pup. Unfortunately, the pup did not survive. However, earlier this year, RA20 gave birth to a second, healthy pup.

As with most wildlife, surviving to adulthood is not easy. First year survival rates for monk seals in the Main Hawaiian islands is approximately 80%. The hooking was a very minor so we have little reason to believe it caused her longer term problems, but again young monk seals face many threats, both anthropogenic and natural. However, we are optimistic we will see her hauled out somewhere sometime soon in good health.

This is a good reminder to report all monk seal sightings on Kaua`i by calling our hotline–808-651-7668.

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Hawaiian monk seals can pup anytime throughout the year, but the majority tend to do so in the spring and summer. Typically, at the start of the year, our team starts tracking pregnant females, watching out for the regulars like RH58, RK30, and RK13. But the list will also include others and can tally more than 10. But we’ve yet to hit double digits in annual pup births on Kauai—at least, in recent history. There are likely moms who miscarry and others (like RK52) who produce stillborn pups. But a handful of pregnant females seem to disappear right before they give birth. Then, they return six or eight weeks later looking thin.

In science, “philopatry” is the tendency for an animal to stay or habitually return to the same place. “Natal philopatry” is the tendency for an animal to return to their birthplace to breed. In the case of Hawaiian monk seals, we often—but not always—see females return to their birthplace to pup. 

The Hawaiian Monk Seal Research Program estimate approximately 300 of the endangered pinnipeds make their home in the Main Hawaiian Islands. On Kauai, we roughly estimate 50, although some seals do make inter-island trips. The island associated with the greatest number of monk seals is Niihau—at 150. Roughly 15 ocean miles separate Kauai from our neighbor island of Niihau. This is not a considerable journey for monk seals. In 2010, one monk seal outfitted with a tracking device made a 2,000-mile pelagic journey. So, for monk seals, 15 miles might be considered a walk in the park. And this can explain why 10 pregnant seals sighted on Kauai beaches results in five pups born on Kauai. A few return to their birth place on Niihau when it’s time for them to pup.

Here’s some data to illustrate:

RK14: A Kauai regular who was observed in 2017 with a pup on Niihau. RK14’s window of absence from Kauai was 8/16/17 to 11/23/17, but she isn’t sighted routinely–she likes to haul out on remote North Shore and Na Pali beaches, so her absence was most likely shorter.

R1KY: A Kauai regular who was observed in 2017 with a pup on Niihau. R1KY’s window of absence from Kauai was 4/8/17 to 6/16/17. In 2018 she wasn’t sighted on Kauai from 5/30/18 to 7/17/18, but no surveys happened on Niihau during this window so we’re unsure if she pupped. Here are before and after photos of her.

R1KY on 04182018R1KY on 07172018

R313: In 2017, she disappeared from 7/26/17 until 9/23/17, looking very large in July, but still pretty big when she came back, so we’re not sure what happened during that time. In 2018, she looked large and had teats protruding on 6/26/18 and was next sighted back on Kauai on 9/1/18 looking thin. 

In 2017, RK28 was on Kauai with teats protruding on 6/5/17, then gone until 8/24/17 when she was reported as “thin.” In 2018 she pupped on Kauai’s North Shore.

In 2018, RK90 likely pupped on Niihau between 12/28/17 and 2/17/18.

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Here’s the first interaction of RK58 and another pup named Sole at Ke Kai Ola. Sole was born on Molokai and is the older and larger of the two.

Like RK58, Sole was rescued and delivered to Ke Kai Ola–known colloquially as the Monk Seal Hospital–due to another mom-pup switch while nursing. Since 2014, Ke Kai Ola has cared for Hawaiian monk seals–mostly pups and weaners–at their facility at Kailua-Kona on Hawaii Island. Ke Kai Ola was built through a cooperative effort between the Marine Mammal Center and the Hawaii Wildlife Fund.

Also, speaking of RH58, on August 16, she was reported to be back on Oahu where she spends her non-motherhood days.

Meanwhile, back on Kauai, the first female to give birth this year, RK13, is putting on weight after weaning her pup, RK42. As you know, females do not feed during the five to seven weeks they nurse their pups, growing skinnier by the day. Typically, females will go into estrus sometime after weaning. They’ll also go through an annual molt in the weeks and months after weaning; however, RK13 hasn’t molted yet. She has been sighted with male R6FQ on numerous occasions since August 11th.

R6FQ is a seven-year-old male who is easily identified by deep line scars at the base of his left rear flipper, possibly sustained during a propeller strike when he was a juvenile. Prior to hanging around RK13, he was repeatedly sighted during June and half of July with RK90.

RK90 is an adult female who was likely born on Niihau. She popped up on a Kauai Beach as a juvenile in 2013 with a fish hook in her mouth. It was removed and at the same time she was flipper-tagged. Last May, she was also found with a large fish hook sticking out of her mouth. This was her second known hooking. Both hooks were successfully removed on the beach. Late last year, RK90 was sighted on Kauai looking large and very pregnant. Then, she disappeared for six weeks, returning in mid-February looking thin. It’s suspected that she returned to her natal island to give birth, something many, but not all, females do.

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Sightings:

The Kauai team logged 33 individually identified monk seals on Kauai in May, for a grand total of 332 sightings. This equates to more than 10 monk seals sighted and reported per day.

New:

  • Juvenile female R7AA hauled out onto roads or parking lots three times in the Poipu area this past month. In order to prevent injury from vehicle traffic she was quickly displaced back onto the beach and into the water.
  • We are currently tracking several pregnant females that we expect to pup any day now. That includes the well known RK30 and a more reclusive seal RK22. Two other females, RH58 and RO28, that are typically on Oahu but come back to their birth beaches on Kauai to pup, are both pregnant and approaching their due dates.

Updates:

  • RK13 gave birth to PK1 on 4/20/2018. Extensive monitoring was immediately set-up and continues. Pup weaned after 37 days of nursing. Tagged as RK42. Mother, RK13, became unusually thin prior to weaning, but has been sighted several times since weaning. The pup has begun socializing with other seals, specifically with a 3-year old female bleach-marked V2.

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