Malibu Lagoon Trip Report: 26 July, 2015

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If you’re wondering what happened to June, it took place – as we have come to expect – between May and July, and the June lagoon trip took place, as usual, on the fourth Sunday (6/28) of the month. I, however, was elsewhere: Lake Louise in Banff National Park, Alberta, Canada, to be exact. It provided a nice view of a large glacier at the far end of a lovely lake, utterly swamped by enormous crowds of people, and appeared to be the “selfie” capital of the world. It also featured Clark’s Nutcrackers hopping everywhere – including the hotel patio – searching for snacks. If you must go, I recommend the off-season, the offer the better. Thus no lagoon report for June.

This month, about 30 birders enjoyed the usual suspects: Mallards, most of whom were ducklings toodling along after their mothers; diving Pied-billed Grebes, an assortment of herons and egrets, a middling-number of cormorants and Brown Pelicans, sandpipers both large and small, barely 100 gulls & terns in six species (unlike April’s 4200 birds!), and a smattering of passerine species – mostly swallows and starlings.

Curiosity drove me to compare this July to earlier Julys, as it seemed low in both species and numbers.

Lagoon		July Average	Variance	Hi-Low range
Birds	July 2015	Prior 12 years	from Ave.	prior 12 years
Species	44	47.3	-7%	37 – 52
Numbers	411	718.3	-43%	309 – 1428

Species diversification was slightly (-7%) below average, and numbers were definitely down (-43%), but both were well within the normal range of variation. I then checked our records on shorebirds (sandpipers) and gulls/terns.

Malibu	Lagoon	July Average	Variance	Hi-Low range
Bird Type	July 2015	Prior 12 years	from Ave.	prior 12 years
Shorebirds
Species	8	7.8	3%	2 – 12
Numbers	71	62.8	13%	4 – 163
Gulls-Terns
Species	6	6.6	-9%	3 – 9
Numbers	105	257	-59%	113 – 823

The numbers of shorebirds (stilt, avocet, oystercatcher, plover & sandpipers) were unexpectedly (to me) up 13% from the average. The number of gulls & terns were, as expected, down significantly, by almost 60% below the prior average. Species diversification was average for both. Well…we’ve been reading about lack of food causing breeding failures among gulls and terns, particularly the huge Heermann’s Gull and Elegant Tern nesting colonies on Isla Rasa in the Sea of Cortez. Perhaps these low numbers are a symptom of it. Perhaps not. One data point is not a trend.

 

Four plover species: Killdeer – breeders at the lagoon for many years – are always around, sometimes with chicks in tow. Black-bellied Plovers have returned from their high-arctic breeding grounds; we’ll likely see them until next March or April. Small numbers of Semipalmated Plovers, also arctic breeders, stop briefly during migration, with numbers peaking in April and August-September. Snowy Plovers generally occupy their winter roosts – Malibu Lagoon is one of only seven such roosts in all of Los Angeles County – from June-July to April-May. They had been absent since January, but finally returned with 1 bird on 28 June and 16 birds on 26 July.

 Speaking of plovers, there was a recent flap when what may be a very uncommon (in California) Common Ringed Plover (CRPL)  showed up on the lower Los Angeles River just south of Willow St. We have links to photos of this bird:
1) Tom Ford-Hutchinson photo with Killdeer, Semipalmated and “mystery bird.”
2) Tom Benson photo showing the toes and webbing.

On-line discussion ensued as to how to distinguish them from the very similar Semipalmated Plover (SEPL).
The best marks seem to be: 1) orbital ring (skin): not yellow/orange in CRPL; 2) chest band a bit bolder and thicker in CRPL; 3) white above & behind eye a bit bolder in CRPL; 4) foot-webbing: SEPL webbed between all 3 front toes, CRPL webbed only between outer & middle toe. I looked through a bunch of photographs after reading this discussion and frankly find it very difficult to see the feet well, if at all, with some SEPLs appearing to have no webbing between inner and middle toe. However, if you’ve ever wondered what the “Semipalmated” referred to, now you know: it’s the short webs between their toes. Other plovers have so little webbing that it’s not worth mentioning. Check the feet (as best you can) in the accompanying pictures.

The discussion was a good example of how birders think and analyze:
1) Tom Ford-Hutchinson’s comments include the “confusion in the literature” about toe-webbing.
2) Tom Benson gives a good synopsis of observations of this particular bird.
3) High-Arctic birder Clare Kines has studied both species on their breeding grounds on Baffin Island, and has a great discussion on his website 10,000 Birds.

Birds new for the season were: Red-breasted Merganser, Black-crowned Night-Heron, Black-bellied and Semipalmated Plovers,  Ruddy Turnstone, Western Sandpiper, and Common Yellowthroat.

Our next three scheduled field trips:  Malibu Lagoon, 23 August, 8:30 & 10am. Lower Los Angeles River, 12 September, 7:30am. Malibu Lagoon, 27 September, 8:30 & 10am.

Our next program: Evening meetings will resume on Tuesday, 6 October, 7:30 pm, at [note change] Chris Reed Park, 1133 7th St., NE corner of 7th and Wilshire Blvd. in Santa Monica.

NOTE: Our 10 a.m. Parent’s & Kids Birdwalk meets at the shaded viewing area. Watch for Willie the Weasel. He’ll be watching for you and your big feet.

Links: Unusual birds at Malibu Lagoon
9/23/02 Aerial photo of Malibu Lagoon
Prior checklists:
2015:   Jan-May
2014:   Jan-July,    July-Dec     2013:   Jan-June,   July-Dec
2012:   Jan-June,   July-Dec    2011:   Jan-June,   July-Dec
2010:  Jan-June,   July-Dec     2009:  Jan-June,   July-Dec

The 10-year comparison summaries created during the project period, despite numerous complaints, remain available on our Lagoon Project Bird Census Page. Very briefly summarized, the results unexpectedly indicate that avian species diversification and numbers improved slightly during the period Jun’12-June’14.   [Chuck Almdale]

Malibu Census 2015	1/25	2/22	3/22	4/26	5/24	7/26
Temperature	73-81	55-63	60-70	66-76	59-70	70-82
Tide Lo/Hi Height	L+1.32	H+4.51	H+4.78	L+0.58	L+0.54	L+2.37
Tide Time	0705	1137	1137	1131	0919	1135
Brant				3	7	1
Canada Goose			1	30
Gadwall	22	30	1	10	22	5
American Wigeon	18	18
Mallard	12	12	12	8	8	55
Northern Shoveler		25	2
Northern Pintail	2	3
Green-winged Teal	25	12
Surf Scoter	13	15
Bufflehead	4	2	2
Red-brstd Merganser	4	2	2			1
Ruddy Duck	38	35	30	4
Red-throated Loon		1	3
Pacific Loon	1	3			1
Common Loon		1	5
Pied-billed Grebe	2	1	2		1	3
Horned Grebe	2	1	1	1
Eared Grebe	3			1
Western Grebe	5	15	12	2	1
Brandt’s Cormorant		1	4		1
Dble-crstd Cormorant	35	50	45	16	55	34
Pelagic Cormorant	1	1		1	4	2
Brown Pelican	50	28	27	1490	70	17
Great Blue Heron	2	2	1	2	2	4
Great Egret		2	10	5	5	4
Snowy Egret	16	26	12	12	4	6
Cattle Egret			1
Blk-crwnd N-Heron						2
Osprey	1	1		1
Red-shouldered Hawk	1
Red-tailed Hawk		1			1
American Coot	88	145	45		1	1
American Avocet		1
Blk-bellied Plover	62	85	6	1		27
Snowy Plover	29					16
Semipalmated Plover				9		1
Killdeer	12	12	3	2	6	4
Spotted Sandpiper	3	3	2	1
Willet	4	3	3	1	1	6
Whimbrel	4	4	10	12	1	13
Long-billed Curlew		1
Marbled Godwit	12	10	8	2
Ruddy Turnstone	5		1			3
Surfbird			4
Sanderling	8
Dunlin				1
Least Sandpiper				15
Western Sandpiper				45		1
Boneparte’s Gull			12	6	1
Heermann’s Gull	17	1	6	350	45	14
Ring-billed Gull	150	90	3	30	8
Western Gull	170	95	3	110	135	40
California Gull	1650	1600	40	600	6	2
Herring Gull	1
Glaucous-wingd Gull	5	4		1	1
Caspian Tern				10	11	1
Forster’s Tern				2
Royal Tern	42	35	15	4	2	3
Elegant Tern			28	3100	85	45
Rock Pigeon	4	5	23	8	9	4
Mourning Dove	3	2	2	2	2	7
Anna’s Hummingbird	1		1	2	2	1
Allen’s Hummingbird	2	3	6	4	6	3
Belted Kingfisher				1
American Kestrel			1
Black Phoebe	1	2	2	2	2	4
Say’s Phoebe	1
American Crow	4	6	5	6	5	4
Common Raven		2
Rough-wingd Swallow			4	4	6	3
Barn Swallow			2	6	12	12
Cliff Swallow				2	10	12
Oak Titmouse	1	1
Bushtit			14		2	2
Blue-gray Gnatcatcher	1
Hermit Thrush		2
American Robin			1		1
Northern Mockingbird	1	1	3	6	3	4
European Starling	45	3	4	10	3	25
Cedar Waxwing				40
Common Yellowthroat	3	3	2			5
Yellow-rumpd Warbler	7	8	5
Townsend’s Warbler	1
Spotted Towhee					1
California Towhee		1	3	2	2	4
Song Sparrow	2	6	9	6	9	5
White-crwnd Sparrow	4	12	10
Red-winged Blackbird					2
Western Meadowlark	24	10	3
Brewer’s Blackbird					2
Great-tailed Grackle	5	4		4	3	3
Brwn-headed Cowbird			4	4
Hooded Oriole					3
House Finch	4		4	12	20	2
Lesser Goldfinch	2		1
Totals by Type	Jan	Feb	Mar	Apr	May	Jul
Waterfowl	138	154	50	55	37	62
Water Birds – Other	187	247	144	1511	134	57
Herons, Egrets & Ibis	18	30	24	19	11	16
Quail & Raptors	2	2	1	1	1	0
Shorebirds	139	119	37	89	8	71
Gulls & Terns	2035	1825	107	4213	294	105
Doves	7	7	25	10	11	11
Other Non-Passerines	3	3	7	7	8	4
Passerines	106	61	76	104	86	85
Totals Birds	2635	2448	471	6009	590	411
Total Species	Jan	Feb	Mar	Apr	May	Jul
Waterfowl	9	10	7	5	3	4
Water Birds – Other	9	11	9	6	8	5
Herons, Egrets & Ibis	2	3	4	3	3	4
Quail & Raptors	2	2	1	1	1	0
Shorebirds	9	8	8	10	3	8
Gulls & Terns	7	6	7	10	9	6
Doves	2	2	2	2	2	2
Other Non-Passerines	2	1	2	3	2	2
Passerines	16	14	17	13	17	13
Totals Species – 95	58	57	57	53	48	44